Commit | Line | Data |
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7996a778 MC |
1 | /* |
2 | * iSCSI lib functions | |
3 | * | |
4 | * Copyright (C) 2006 Red Hat, Inc. All rights reserved. | |
5 | * Copyright (C) 2004 - 2006 Mike Christie | |
6 | * Copyright (C) 2004 - 2005 Dmitry Yusupov | |
7 | * Copyright (C) 2004 - 2005 Alex Aizman | |
8 | * maintained by open-iscsi@googlegroups.com | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
23 | */ | |
24 | #include <linux/types.h> | |
7996a778 MC |
25 | #include <linux/kfifo.h> |
26 | #include <linux/delay.h> | |
8eb00539 | 27 | #include <asm/unaligned.h> |
7996a778 MC |
28 | #include <net/tcp.h> |
29 | #include <scsi/scsi_cmnd.h> | |
30 | #include <scsi/scsi_device.h> | |
31 | #include <scsi/scsi_eh.h> | |
32 | #include <scsi/scsi_tcq.h> | |
33 | #include <scsi/scsi_host.h> | |
34 | #include <scsi/scsi.h> | |
35 | #include <scsi/iscsi_proto.h> | |
36 | #include <scsi/scsi_transport.h> | |
37 | #include <scsi/scsi_transport_iscsi.h> | |
38 | #include <scsi/libiscsi.h> | |
39 | ||
40 | struct iscsi_session * | |
41 | class_to_transport_session(struct iscsi_cls_session *cls_session) | |
42 | { | |
43 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); | |
44 | return iscsi_hostdata(shost->hostdata); | |
45 | } | |
46 | EXPORT_SYMBOL_GPL(class_to_transport_session); | |
47 | ||
77a23c21 MC |
48 | /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */ |
49 | #define SNA32_CHECK 2147483648UL | |
7996a778 | 50 | |
77a23c21 MC |
51 | static int iscsi_sna_lt(u32 n1, u32 n2) |
52 | { | |
53 | return n1 != n2 && ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) || | |
54 | (n1 > n2 && (n2 - n1 < SNA32_CHECK))); | |
55 | } | |
56 | ||
57 | /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */ | |
58 | static int iscsi_sna_lte(u32 n1, u32 n2) | |
59 | { | |
60 | return n1 == n2 || ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) || | |
61 | (n1 > n2 && (n2 - n1 < SNA32_CHECK))); | |
62 | } | |
63 | ||
64 | void | |
65 | iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr) | |
7996a778 MC |
66 | { |
67 | uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn); | |
68 | uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn); | |
69 | ||
77a23c21 MC |
70 | /* |
71 | * standard specifies this check for when to update expected and | |
72 | * max sequence numbers | |
73 | */ | |
74 | if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1)) | |
75 | return; | |
76 | ||
77 | if (exp_cmdsn != session->exp_cmdsn && | |
78 | !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn)) | |
7996a778 MC |
79 | session->exp_cmdsn = exp_cmdsn; |
80 | ||
77a23c21 MC |
81 | if (max_cmdsn != session->max_cmdsn && |
82 | !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) { | |
83 | session->max_cmdsn = max_cmdsn; | |
84 | /* | |
85 | * if the window closed with IO queued, then kick the | |
86 | * xmit thread | |
87 | */ | |
88 | if (!list_empty(&session->leadconn->xmitqueue) || | |
843c0a8a | 89 | !list_empty(&session->leadconn->mgmtqueue)) |
77a23c21 MC |
90 | scsi_queue_work(session->host, |
91 | &session->leadconn->xmitwork); | |
92 | } | |
7996a778 | 93 | } |
77a23c21 | 94 | EXPORT_SYMBOL_GPL(iscsi_update_cmdsn); |
7996a778 MC |
95 | |
96 | void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *ctask, | |
ffd0436e | 97 | struct iscsi_data *hdr) |
7996a778 MC |
98 | { |
99 | struct iscsi_conn *conn = ctask->conn; | |
100 | ||
101 | memset(hdr, 0, sizeof(struct iscsi_data)); | |
102 | hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); | |
103 | hdr->datasn = cpu_to_be32(ctask->unsol_datasn); | |
104 | ctask->unsol_datasn++; | |
105 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; | |
106 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); | |
107 | ||
108 | hdr->itt = ctask->hdr->itt; | |
109 | hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
ffd0436e | 110 | hdr->offset = cpu_to_be32(ctask->unsol_offset); |
7996a778 MC |
111 | |
112 | if (ctask->unsol_count > conn->max_xmit_dlength) { | |
113 | hton24(hdr->dlength, conn->max_xmit_dlength); | |
114 | ctask->data_count = conn->max_xmit_dlength; | |
ffd0436e | 115 | ctask->unsol_offset += ctask->data_count; |
7996a778 MC |
116 | hdr->flags = 0; |
117 | } else { | |
118 | hton24(hdr->dlength, ctask->unsol_count); | |
119 | ctask->data_count = ctask->unsol_count; | |
120 | hdr->flags = ISCSI_FLAG_CMD_FINAL; | |
121 | } | |
122 | } | |
123 | EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu); | |
124 | ||
125 | /** | |
126 | * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu | |
127 | * @ctask: iscsi cmd task | |
128 | * | |
129 | * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set | |
130 | * fields like dlength or final based on how much data it sends | |
131 | */ | |
132 | static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask) | |
133 | { | |
134 | struct iscsi_conn *conn = ctask->conn; | |
135 | struct iscsi_session *session = conn->session; | |
136 | struct iscsi_cmd *hdr = ctask->hdr; | |
137 | struct scsi_cmnd *sc = ctask->sc; | |
138 | ||
139 | hdr->opcode = ISCSI_OP_SCSI_CMD; | |
140 | hdr->flags = ISCSI_ATTR_SIMPLE; | |
141 | int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun); | |
b4377356 | 142 | hdr->itt = build_itt(ctask->itt, conn->id, session->age); |
1c138991 | 143 | hdr->data_length = cpu_to_be32(scsi_bufflen(sc)); |
7996a778 MC |
144 | hdr->cmdsn = cpu_to_be32(session->cmdsn); |
145 | session->cmdsn++; | |
146 | hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
147 | memcpy(hdr->cdb, sc->cmnd, sc->cmd_len); | |
d473cc7f MC |
148 | if (sc->cmd_len < MAX_COMMAND_SIZE) |
149 | memset(&hdr->cdb[sc->cmd_len], 0, | |
150 | MAX_COMMAND_SIZE - sc->cmd_len); | |
7996a778 | 151 | |
ffd0436e | 152 | ctask->data_count = 0; |
218432c6 | 153 | ctask->imm_count = 0; |
7996a778 MC |
154 | if (sc->sc_data_direction == DMA_TO_DEVICE) { |
155 | hdr->flags |= ISCSI_FLAG_CMD_WRITE; | |
156 | /* | |
157 | * Write counters: | |
158 | * | |
159 | * imm_count bytes to be sent right after | |
160 | * SCSI PDU Header | |
161 | * | |
162 | * unsol_count bytes(as Data-Out) to be sent | |
163 | * without R2T ack right after | |
164 | * immediate data | |
165 | * | |
166 | * r2t_data_count bytes to be sent via R2T ack's | |
167 | * | |
168 | * pad_count bytes to be sent as zero-padding | |
169 | */ | |
7996a778 | 170 | ctask->unsol_count = 0; |
ffd0436e | 171 | ctask->unsol_offset = 0; |
7996a778 MC |
172 | ctask->unsol_datasn = 0; |
173 | ||
174 | if (session->imm_data_en) { | |
1c138991 | 175 | if (scsi_bufflen(sc) >= session->first_burst) |
7996a778 MC |
176 | ctask->imm_count = min(session->first_burst, |
177 | conn->max_xmit_dlength); | |
178 | else | |
1c138991 | 179 | ctask->imm_count = min(scsi_bufflen(sc), |
7996a778 MC |
180 | conn->max_xmit_dlength); |
181 | hton24(ctask->hdr->dlength, ctask->imm_count); | |
182 | } else | |
183 | zero_data(ctask->hdr->dlength); | |
184 | ||
ffd0436e | 185 | if (!session->initial_r2t_en) { |
857ae0bd | 186 | ctask->unsol_count = min((session->first_burst), |
1c138991 | 187 | (scsi_bufflen(sc))) - ctask->imm_count; |
ffd0436e MC |
188 | ctask->unsol_offset = ctask->imm_count; |
189 | } | |
190 | ||
7996a778 MC |
191 | if (!ctask->unsol_count) |
192 | /* No unsolicit Data-Out's */ | |
193 | ctask->hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
194 | } else { | |
7996a778 MC |
195 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
196 | zero_data(hdr->dlength); | |
197 | ||
198 | if (sc->sc_data_direction == DMA_FROM_DEVICE) | |
199 | hdr->flags |= ISCSI_FLAG_CMD_READ; | |
200 | } | |
201 | ||
202 | conn->scsicmd_pdus_cnt++; | |
77a23c21 MC |
203 | |
204 | debug_scsi("iscsi prep [%s cid %d sc %p cdb 0x%x itt 0x%x len %d " | |
205 | "cmdsn %d win %d]\n", | |
206 | sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read", | |
1c138991 | 207 | conn->id, sc, sc->cmnd[0], ctask->itt, scsi_bufflen(sc), |
77a23c21 | 208 | session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1); |
7996a778 | 209 | } |
7996a778 MC |
210 | |
211 | /** | |
212 | * iscsi_complete_command - return command back to scsi-ml | |
7996a778 MC |
213 | * @ctask: iscsi cmd task |
214 | * | |
215 | * Must be called with session lock. | |
216 | * This function returns the scsi command to scsi-ml and returns | |
217 | * the cmd task to the pool of available cmd tasks. | |
218 | */ | |
60ecebf5 | 219 | static void iscsi_complete_command(struct iscsi_cmd_task *ctask) |
7996a778 | 220 | { |
60ecebf5 | 221 | struct iscsi_session *session = ctask->conn->session; |
7996a778 MC |
222 | struct scsi_cmnd *sc = ctask->sc; |
223 | ||
b6c395ed | 224 | ctask->state = ISCSI_TASK_COMPLETED; |
7996a778 | 225 | ctask->sc = NULL; |
f47f2cf5 MC |
226 | /* SCSI eh reuses commands to verify us */ |
227 | sc->SCp.ptr = NULL; | |
7996a778 MC |
228 | list_del_init(&ctask->running); |
229 | __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*)); | |
230 | sc->scsi_done(sc); | |
231 | } | |
232 | ||
60ecebf5 MC |
233 | static void __iscsi_get_ctask(struct iscsi_cmd_task *ctask) |
234 | { | |
235 | atomic_inc(&ctask->refcount); | |
236 | } | |
237 | ||
60ecebf5 MC |
238 | static void __iscsi_put_ctask(struct iscsi_cmd_task *ctask) |
239 | { | |
e648f63c | 240 | if (atomic_dec_and_test(&ctask->refcount)) |
60ecebf5 | 241 | iscsi_complete_command(ctask); |
60ecebf5 MC |
242 | } |
243 | ||
7996a778 MC |
244 | /** |
245 | * iscsi_cmd_rsp - SCSI Command Response processing | |
246 | * @conn: iscsi connection | |
247 | * @hdr: iscsi header | |
248 | * @ctask: scsi command task | |
249 | * @data: cmd data buffer | |
250 | * @datalen: len of buffer | |
251 | * | |
252 | * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and | |
253 | * then completes the command and task. | |
254 | **/ | |
77a23c21 MC |
255 | static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
256 | struct iscsi_cmd_task *ctask, char *data, | |
257 | int datalen) | |
7996a778 | 258 | { |
7996a778 MC |
259 | struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr; |
260 | struct iscsi_session *session = conn->session; | |
261 | struct scsi_cmnd *sc = ctask->sc; | |
262 | ||
77a23c21 | 263 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); |
7996a778 MC |
264 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; |
265 | ||
266 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
267 | ||
268 | if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { | |
269 | sc->result = DID_ERROR << 16; | |
270 | goto out; | |
271 | } | |
272 | ||
273 | if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) { | |
9b80cb4b | 274 | uint16_t senselen; |
7996a778 MC |
275 | |
276 | if (datalen < 2) { | |
277 | invalid_datalen: | |
be2df72e OG |
278 | printk(KERN_ERR "iscsi: Got CHECK_CONDITION but " |
279 | "invalid data buffer size of %d\n", datalen); | |
7996a778 MC |
280 | sc->result = DID_BAD_TARGET << 16; |
281 | goto out; | |
282 | } | |
283 | ||
8eb00539 | 284 | senselen = be16_to_cpu(get_unaligned((__be16 *) data)); |
7996a778 MC |
285 | if (datalen < senselen) |
286 | goto invalid_datalen; | |
287 | ||
288 | memcpy(sc->sense_buffer, data + 2, | |
9b80cb4b | 289 | min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); |
7996a778 | 290 | debug_scsi("copied %d bytes of sense\n", |
8eb00539 | 291 | min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); |
7996a778 MC |
292 | } |
293 | ||
7996a778 MC |
294 | if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) { |
295 | int res_count = be32_to_cpu(rhdr->residual_count); | |
296 | ||
1c138991 FT |
297 | if (res_count > 0 && res_count <= scsi_bufflen(sc)) |
298 | scsi_set_resid(sc, res_count); | |
7996a778 MC |
299 | else |
300 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
301 | } else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW) | |
302 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
303 | else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW) | |
1c138991 | 304 | scsi_set_resid(sc, be32_to_cpu(rhdr->residual_count)); |
7996a778 MC |
305 | |
306 | out: | |
307 | debug_scsi("done [sc %lx res %d itt 0x%x]\n", | |
308 | (long)sc, sc->result, ctask->itt); | |
309 | conn->scsirsp_pdus_cnt++; | |
310 | ||
60ecebf5 | 311 | __iscsi_put_ctask(ctask); |
7996a778 MC |
312 | } |
313 | ||
7ea8b828 MC |
314 | static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) |
315 | { | |
316 | struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr; | |
317 | ||
318 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
319 | conn->tmfrsp_pdus_cnt++; | |
320 | ||
843c0a8a | 321 | if (conn->tmf_state != TMF_QUEUED) |
7ea8b828 MC |
322 | return; |
323 | ||
324 | if (tmf->response == ISCSI_TMF_RSP_COMPLETE) | |
843c0a8a | 325 | conn->tmf_state = TMF_SUCCESS; |
7ea8b828 | 326 | else if (tmf->response == ISCSI_TMF_RSP_NO_TASK) |
843c0a8a | 327 | conn->tmf_state = TMF_NOT_FOUND; |
7ea8b828 | 328 | else |
843c0a8a | 329 | conn->tmf_state = TMF_FAILED; |
7ea8b828 MC |
330 | wake_up(&conn->ehwait); |
331 | } | |
332 | ||
62f38300 MC |
333 | static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
334 | char *data, int datalen) | |
335 | { | |
336 | struct iscsi_reject *reject = (struct iscsi_reject *)hdr; | |
337 | struct iscsi_hdr rejected_pdu; | |
338 | uint32_t itt; | |
339 | ||
340 | conn->exp_statsn = be32_to_cpu(reject->statsn) + 1; | |
341 | ||
342 | if (reject->reason == ISCSI_REASON_DATA_DIGEST_ERROR) { | |
343 | if (ntoh24(reject->dlength) > datalen) | |
344 | return ISCSI_ERR_PROTO; | |
345 | ||
346 | if (ntoh24(reject->dlength) >= sizeof(struct iscsi_hdr)) { | |
347 | memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr)); | |
b4377356 | 348 | itt = get_itt(rejected_pdu.itt); |
62f38300 MC |
349 | printk(KERN_ERR "itt 0x%x had pdu (op 0x%x) rejected " |
350 | "due to DataDigest error.\n", itt, | |
351 | rejected_pdu.opcode); | |
352 | } | |
353 | } | |
354 | return 0; | |
355 | } | |
356 | ||
7996a778 MC |
357 | /** |
358 | * __iscsi_complete_pdu - complete pdu | |
359 | * @conn: iscsi conn | |
360 | * @hdr: iscsi header | |
361 | * @data: data buffer | |
362 | * @datalen: len of data buffer | |
363 | * | |
364 | * Completes pdu processing by freeing any resources allocated at | |
365 | * queuecommand or send generic. session lock must be held and verify | |
366 | * itt must have been called. | |
367 | */ | |
368 | int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
369 | char *data, int datalen) | |
370 | { | |
371 | struct iscsi_session *session = conn->session; | |
372 | int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0; | |
373 | struct iscsi_cmd_task *ctask; | |
374 | struct iscsi_mgmt_task *mtask; | |
375 | uint32_t itt; | |
376 | ||
b4377356 AV |
377 | if (hdr->itt != RESERVED_ITT) |
378 | itt = get_itt(hdr->itt); | |
7996a778 | 379 | else |
b4377356 | 380 | itt = ~0U; |
7996a778 MC |
381 | |
382 | if (itt < session->cmds_max) { | |
383 | ctask = session->cmds[itt]; | |
384 | ||
385 | debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n", | |
386 | opcode, conn->id, ctask->itt, datalen); | |
387 | ||
388 | switch(opcode) { | |
389 | case ISCSI_OP_SCSI_CMD_RSP: | |
390 | BUG_ON((void*)ctask != ctask->sc->SCp.ptr); | |
77a23c21 MC |
391 | iscsi_scsi_cmd_rsp(conn, hdr, ctask, data, |
392 | datalen); | |
7996a778 MC |
393 | break; |
394 | case ISCSI_OP_SCSI_DATA_IN: | |
395 | BUG_ON((void*)ctask != ctask->sc->SCp.ptr); | |
396 | if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { | |
397 | conn->scsirsp_pdus_cnt++; | |
60ecebf5 | 398 | __iscsi_put_ctask(ctask); |
7996a778 MC |
399 | } |
400 | break; | |
401 | case ISCSI_OP_R2T: | |
402 | /* LLD handles this for now */ | |
403 | break; | |
404 | default: | |
405 | rc = ISCSI_ERR_BAD_OPCODE; | |
406 | break; | |
407 | } | |
408 | } else if (itt >= ISCSI_MGMT_ITT_OFFSET && | |
409 | itt < ISCSI_MGMT_ITT_OFFSET + session->mgmtpool_max) { | |
410 | mtask = session->mgmt_cmds[itt - ISCSI_MGMT_ITT_OFFSET]; | |
411 | ||
412 | debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n", | |
413 | opcode, conn->id, mtask->itt, datalen); | |
414 | ||
77a23c21 | 415 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); |
7996a778 | 416 | switch(opcode) { |
8d2860b3 | 417 | case ISCSI_OP_LOGOUT_RSP: |
c8dc1e52 MC |
418 | if (datalen) { |
419 | rc = ISCSI_ERR_PROTO; | |
420 | break; | |
421 | } | |
8d2860b3 MC |
422 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
423 | /* fall through */ | |
7996a778 MC |
424 | case ISCSI_OP_LOGIN_RSP: |
425 | case ISCSI_OP_TEXT_RSP: | |
8d2860b3 MC |
426 | /* |
427 | * login related PDU's exp_statsn is handled in | |
428 | * userspace | |
429 | */ | |
40527afe MC |
430 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) |
431 | rc = ISCSI_ERR_CONN_FAILED; | |
843c0a8a | 432 | list_del_init(&mtask->running); |
7996a778 MC |
433 | if (conn->login_mtask != mtask) |
434 | __kfifo_put(session->mgmtpool.queue, | |
435 | (void*)&mtask, sizeof(void*)); | |
436 | break; | |
437 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
7996a778 MC |
438 | if (datalen) { |
439 | rc = ISCSI_ERR_PROTO; | |
440 | break; | |
441 | } | |
8d2860b3 | 442 | |
7ea8b828 | 443 | iscsi_tmf_rsp(conn, hdr); |
7996a778 MC |
444 | break; |
445 | case ISCSI_OP_NOOP_IN: | |
b4377356 | 446 | if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) { |
7996a778 MC |
447 | rc = ISCSI_ERR_PROTO; |
448 | break; | |
449 | } | |
7996a778 MC |
450 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
451 | ||
40527afe MC |
452 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) |
453 | rc = ISCSI_ERR_CONN_FAILED; | |
843c0a8a MC |
454 | list_del_init(&mtask->running); |
455 | __kfifo_put(session->mgmtpool.queue, | |
456 | (void*)&mtask, sizeof(void*)); | |
7996a778 MC |
457 | break; |
458 | default: | |
459 | rc = ISCSI_ERR_BAD_OPCODE; | |
460 | break; | |
461 | } | |
b4377356 | 462 | } else if (itt == ~0U) { |
77a23c21 | 463 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); |
62f38300 | 464 | |
7996a778 MC |
465 | switch(opcode) { |
466 | case ISCSI_OP_NOOP_IN: | |
40527afe | 467 | if (datalen) { |
7996a778 | 468 | rc = ISCSI_ERR_PROTO; |
40527afe MC |
469 | break; |
470 | } | |
471 | ||
b4377356 | 472 | if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG)) |
40527afe MC |
473 | break; |
474 | ||
475 | if (iscsi_recv_pdu(conn->cls_conn, hdr, NULL, 0)) | |
476 | rc = ISCSI_ERR_CONN_FAILED; | |
7996a778 MC |
477 | break; |
478 | case ISCSI_OP_REJECT: | |
62f38300 MC |
479 | rc = iscsi_handle_reject(conn, hdr, data, datalen); |
480 | break; | |
7996a778 | 481 | case ISCSI_OP_ASYNC_EVENT: |
8d2860b3 | 482 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
5831c737 MC |
483 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) |
484 | rc = ISCSI_ERR_CONN_FAILED; | |
7996a778 MC |
485 | break; |
486 | default: | |
487 | rc = ISCSI_ERR_BAD_OPCODE; | |
488 | break; | |
489 | } | |
490 | } else | |
491 | rc = ISCSI_ERR_BAD_ITT; | |
492 | ||
493 | return rc; | |
494 | } | |
495 | EXPORT_SYMBOL_GPL(__iscsi_complete_pdu); | |
496 | ||
497 | int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
498 | char *data, int datalen) | |
499 | { | |
500 | int rc; | |
501 | ||
502 | spin_lock(&conn->session->lock); | |
503 | rc = __iscsi_complete_pdu(conn, hdr, data, datalen); | |
504 | spin_unlock(&conn->session->lock); | |
505 | return rc; | |
506 | } | |
507 | EXPORT_SYMBOL_GPL(iscsi_complete_pdu); | |
508 | ||
509 | /* verify itt (itt encoding: age+cid+itt) */ | |
510 | int iscsi_verify_itt(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
511 | uint32_t *ret_itt) | |
512 | { | |
513 | struct iscsi_session *session = conn->session; | |
514 | struct iscsi_cmd_task *ctask; | |
515 | uint32_t itt; | |
516 | ||
b4377356 AV |
517 | if (hdr->itt != RESERVED_ITT) { |
518 | if (((__force u32)hdr->itt & ISCSI_AGE_MASK) != | |
7996a778 | 519 | (session->age << ISCSI_AGE_SHIFT)) { |
be2df72e | 520 | printk(KERN_ERR "iscsi: received itt %x expected " |
b4377356 | 521 | "session age (%x)\n", (__force u32)hdr->itt, |
7996a778 MC |
522 | session->age & ISCSI_AGE_MASK); |
523 | return ISCSI_ERR_BAD_ITT; | |
524 | } | |
525 | ||
b4377356 | 526 | if (((__force u32)hdr->itt & ISCSI_CID_MASK) != |
7996a778 | 527 | (conn->id << ISCSI_CID_SHIFT)) { |
be2df72e | 528 | printk(KERN_ERR "iscsi: received itt %x, expected " |
b4377356 | 529 | "CID (%x)\n", (__force u32)hdr->itt, conn->id); |
7996a778 MC |
530 | return ISCSI_ERR_BAD_ITT; |
531 | } | |
b4377356 | 532 | itt = get_itt(hdr->itt); |
7996a778 | 533 | } else |
b4377356 | 534 | itt = ~0U; |
7996a778 MC |
535 | |
536 | if (itt < session->cmds_max) { | |
537 | ctask = session->cmds[itt]; | |
538 | ||
539 | if (!ctask->sc) { | |
be2df72e | 540 | printk(KERN_INFO "iscsi: dropping ctask with " |
7996a778 MC |
541 | "itt 0x%x\n", ctask->itt); |
542 | /* force drop */ | |
543 | return ISCSI_ERR_NO_SCSI_CMD; | |
544 | } | |
545 | ||
546 | if (ctask->sc->SCp.phase != session->age) { | |
be2df72e | 547 | printk(KERN_ERR "iscsi: ctask's session age %d, " |
7996a778 MC |
548 | "expected %d\n", ctask->sc->SCp.phase, |
549 | session->age); | |
550 | return ISCSI_ERR_SESSION_FAILED; | |
551 | } | |
552 | } | |
553 | ||
554 | *ret_itt = itt; | |
555 | return 0; | |
556 | } | |
557 | EXPORT_SYMBOL_GPL(iscsi_verify_itt); | |
558 | ||
559 | void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) | |
560 | { | |
561 | struct iscsi_session *session = conn->session; | |
562 | unsigned long flags; | |
563 | ||
564 | spin_lock_irqsave(&session->lock, flags); | |
656cffc9 MC |
565 | if (session->state == ISCSI_STATE_FAILED) { |
566 | spin_unlock_irqrestore(&session->lock, flags); | |
567 | return; | |
568 | } | |
569 | ||
67a61114 | 570 | if (conn->stop_stage == 0) |
7996a778 MC |
571 | session->state = ISCSI_STATE_FAILED; |
572 | spin_unlock_irqrestore(&session->lock, flags); | |
573 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
574 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
575 | iscsi_conn_error(conn->cls_conn, err); | |
576 | } | |
577 | EXPORT_SYMBOL_GPL(iscsi_conn_failure); | |
578 | ||
77a23c21 MC |
579 | static void iscsi_prep_mtask(struct iscsi_conn *conn, |
580 | struct iscsi_mgmt_task *mtask) | |
581 | { | |
582 | struct iscsi_session *session = conn->session; | |
583 | struct iscsi_hdr *hdr = mtask->hdr; | |
584 | struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; | |
585 | ||
586 | if (hdr->opcode != (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) && | |
587 | hdr->opcode != (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE)) | |
588 | nop->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
589 | /* | |
590 | * pre-format CmdSN for outgoing PDU. | |
591 | */ | |
592 | nop->cmdsn = cpu_to_be32(session->cmdsn); | |
593 | if (hdr->itt != RESERVED_ITT) { | |
594 | hdr->itt = build_itt(mtask->itt, conn->id, session->age); | |
e0726407 MC |
595 | /* |
596 | * TODO: We always use immediate, so we never hit this. | |
597 | * If we start to send tmfs or nops as non-immediate then | |
598 | * we should start checking the cmdsn numbers for mgmt tasks. | |
599 | */ | |
77a23c21 | 600 | if (conn->c_stage == ISCSI_CONN_STARTED && |
e0726407 MC |
601 | !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { |
602 | session->queued_cmdsn++; | |
77a23c21 | 603 | session->cmdsn++; |
e0726407 | 604 | } |
77a23c21 MC |
605 | } |
606 | ||
607 | if (session->tt->init_mgmt_task) | |
608 | session->tt->init_mgmt_task(conn, mtask); | |
609 | ||
610 | debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n", | |
843c0a8a MC |
611 | hdr->opcode & ISCSI_OPCODE_MASK, hdr->itt, |
612 | mtask->data_count); | |
77a23c21 MC |
613 | } |
614 | ||
05db888a | 615 | static int iscsi_xmit_mtask(struct iscsi_conn *conn) |
b5072ea0 MC |
616 | { |
617 | struct iscsi_hdr *hdr = conn->mtask->hdr; | |
618 | int rc, was_logout = 0; | |
619 | ||
77a23c21 | 620 | spin_unlock_bh(&conn->session->lock); |
b5072ea0 MC |
621 | if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) { |
622 | conn->session->state = ISCSI_STATE_IN_RECOVERY; | |
623 | iscsi_block_session(session_to_cls(conn->session)); | |
624 | was_logout = 1; | |
625 | } | |
626 | rc = conn->session->tt->xmit_mgmt_task(conn, conn->mtask); | |
77a23c21 | 627 | spin_lock_bh(&conn->session->lock); |
b5072ea0 MC |
628 | if (rc) |
629 | return rc; | |
630 | ||
05db888a MC |
631 | /* done with this in-progress mtask */ |
632 | conn->mtask = NULL; | |
633 | ||
b5072ea0 MC |
634 | if (was_logout) { |
635 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
636 | return -ENODATA; | |
637 | } | |
638 | return 0; | |
639 | } | |
640 | ||
77a23c21 MC |
641 | static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn) |
642 | { | |
643 | struct iscsi_session *session = conn->session; | |
644 | ||
645 | /* | |
646 | * Check for iSCSI window and take care of CmdSN wrap-around | |
647 | */ | |
e0726407 MC |
648 | if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) { |
649 | debug_scsi("iSCSI CmdSN closed. ExpCmdSn %u MaxCmdSN %u " | |
650 | "CmdSN %u/%u\n", session->exp_cmdsn, | |
651 | session->max_cmdsn, session->cmdsn, | |
652 | session->queued_cmdsn); | |
77a23c21 MC |
653 | return -ENOSPC; |
654 | } | |
655 | return 0; | |
656 | } | |
657 | ||
658 | static int iscsi_xmit_ctask(struct iscsi_conn *conn) | |
659 | { | |
660 | struct iscsi_cmd_task *ctask = conn->ctask; | |
843c0a8a | 661 | int rc; |
77a23c21 MC |
662 | |
663 | __iscsi_get_ctask(ctask); | |
664 | spin_unlock_bh(&conn->session->lock); | |
665 | rc = conn->session->tt->xmit_cmd_task(conn, ctask); | |
666 | spin_lock_bh(&conn->session->lock); | |
667 | __iscsi_put_ctask(ctask); | |
77a23c21 MC |
668 | if (!rc) |
669 | /* done with this ctask */ | |
670 | conn->ctask = NULL; | |
671 | return rc; | |
672 | } | |
673 | ||
843c0a8a MC |
674 | /** |
675 | * iscsi_requeue_ctask - requeue ctask to run from session workqueue | |
676 | * @ctask: ctask to requeue | |
677 | * | |
678 | * LLDs that need to run a ctask from the session workqueue should call | |
679 | * this. The session lock must be held. | |
680 | */ | |
681 | void iscsi_requeue_ctask(struct iscsi_cmd_task *ctask) | |
682 | { | |
683 | struct iscsi_conn *conn = ctask->conn; | |
684 | ||
685 | list_move_tail(&ctask->running, &conn->requeue); | |
686 | scsi_queue_work(conn->session->host, &conn->xmitwork); | |
687 | } | |
688 | EXPORT_SYMBOL_GPL(iscsi_requeue_ctask); | |
689 | ||
7996a778 MC |
690 | /** |
691 | * iscsi_data_xmit - xmit any command into the scheduled connection | |
692 | * @conn: iscsi connection | |
693 | * | |
694 | * Notes: | |
695 | * The function can return -EAGAIN in which case the caller must | |
696 | * re-schedule it again later or recover. '0' return code means | |
697 | * successful xmit. | |
698 | **/ | |
699 | static int iscsi_data_xmit(struct iscsi_conn *conn) | |
700 | { | |
3219e529 | 701 | int rc = 0; |
7996a778 | 702 | |
77a23c21 | 703 | spin_lock_bh(&conn->session->lock); |
7996a778 MC |
704 | if (unlikely(conn->suspend_tx)) { |
705 | debug_scsi("conn %d Tx suspended!\n", conn->id); | |
77a23c21 | 706 | spin_unlock_bh(&conn->session->lock); |
3219e529 | 707 | return -ENODATA; |
7996a778 | 708 | } |
7996a778 MC |
709 | |
710 | if (conn->ctask) { | |
77a23c21 | 711 | rc = iscsi_xmit_ctask(conn); |
3219e529 | 712 | if (rc) |
7996a778 | 713 | goto again; |
7996a778 | 714 | } |
77a23c21 | 715 | |
7996a778 | 716 | if (conn->mtask) { |
05db888a | 717 | rc = iscsi_xmit_mtask(conn); |
3219e529 | 718 | if (rc) |
7996a778 | 719 | goto again; |
7996a778 MC |
720 | } |
721 | ||
77a23c21 MC |
722 | /* |
723 | * process mgmt pdus like nops before commands since we should | |
724 | * only have one nop-out as a ping from us and targets should not | |
725 | * overflow us with nop-ins | |
726 | */ | |
727 | check_mgmt: | |
843c0a8a MC |
728 | while (!list_empty(&conn->mgmtqueue)) { |
729 | conn->mtask = list_entry(conn->mgmtqueue.next, | |
730 | struct iscsi_mgmt_task, running); | |
77a23c21 | 731 | iscsi_prep_mtask(conn, conn->mtask); |
843c0a8a | 732 | list_move_tail(conn->mgmtqueue.next, &conn->mgmt_run_list); |
77a23c21 MC |
733 | rc = iscsi_xmit_mtask(conn); |
734 | if (rc) | |
735 | goto again; | |
7996a778 MC |
736 | } |
737 | ||
843c0a8a | 738 | /* process pending command queue */ |
b6c395ed | 739 | while (!list_empty(&conn->xmitqueue)) { |
843c0a8a MC |
740 | if (conn->tmf_state == TMF_QUEUED) |
741 | break; | |
742 | ||
b6c395ed MC |
743 | conn->ctask = list_entry(conn->xmitqueue.next, |
744 | struct iscsi_cmd_task, running); | |
843c0a8a MC |
745 | iscsi_prep_scsi_cmd_pdu(conn->ctask); |
746 | conn->session->tt->init_cmd_task(conn->ctask); | |
747 | conn->ctask->state = ISCSI_TASK_RUNNING; | |
b6c395ed | 748 | list_move_tail(conn->xmitqueue.next, &conn->run_list); |
77a23c21 MC |
749 | rc = iscsi_xmit_ctask(conn); |
750 | if (rc) | |
60ecebf5 | 751 | goto again; |
77a23c21 MC |
752 | /* |
753 | * we could continuously get new ctask requests so | |
754 | * we need to check the mgmt queue for nops that need to | |
755 | * be sent to aviod starvation | |
756 | */ | |
843c0a8a MC |
757 | if (!list_empty(&conn->mgmtqueue)) |
758 | goto check_mgmt; | |
759 | } | |
760 | ||
761 | while (!list_empty(&conn->requeue)) { | |
762 | if (conn->session->fast_abort && conn->tmf_state != TMF_INITIAL) | |
763 | break; | |
764 | ||
765 | conn->ctask = list_entry(conn->requeue.next, | |
766 | struct iscsi_cmd_task, running); | |
767 | conn->ctask->state = ISCSI_TASK_RUNNING; | |
768 | list_move_tail(conn->requeue.next, &conn->run_list); | |
769 | rc = iscsi_xmit_ctask(conn); | |
770 | if (rc) | |
771 | goto again; | |
772 | if (!list_empty(&conn->mgmtqueue)) | |
77a23c21 | 773 | goto check_mgmt; |
7996a778 | 774 | } |
b6c395ed | 775 | spin_unlock_bh(&conn->session->lock); |
3219e529 | 776 | return -ENODATA; |
7996a778 MC |
777 | |
778 | again: | |
779 | if (unlikely(conn->suspend_tx)) | |
77a23c21 MC |
780 | rc = -ENODATA; |
781 | spin_unlock_bh(&conn->session->lock); | |
3219e529 | 782 | return rc; |
7996a778 MC |
783 | } |
784 | ||
c4028958 | 785 | static void iscsi_xmitworker(struct work_struct *work) |
7996a778 | 786 | { |
c4028958 DH |
787 | struct iscsi_conn *conn = |
788 | container_of(work, struct iscsi_conn, xmitwork); | |
3219e529 | 789 | int rc; |
7996a778 MC |
790 | /* |
791 | * serialize Xmit worker on a per-connection basis. | |
792 | */ | |
3219e529 MC |
793 | do { |
794 | rc = iscsi_data_xmit(conn); | |
795 | } while (rc >= 0 || rc == -EAGAIN); | |
7996a778 MC |
796 | } |
797 | ||
798 | enum { | |
799 | FAILURE_BAD_HOST = 1, | |
800 | FAILURE_SESSION_FAILED, | |
801 | FAILURE_SESSION_FREED, | |
802 | FAILURE_WINDOW_CLOSED, | |
60ecebf5 | 803 | FAILURE_OOM, |
7996a778 | 804 | FAILURE_SESSION_TERMINATE, |
656cffc9 | 805 | FAILURE_SESSION_IN_RECOVERY, |
7996a778 MC |
806 | FAILURE_SESSION_RECOVERY_TIMEOUT, |
807 | }; | |
808 | ||
809 | int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *)) | |
810 | { | |
811 | struct Scsi_Host *host; | |
812 | int reason = 0; | |
813 | struct iscsi_session *session; | |
814 | struct iscsi_conn *conn; | |
815 | struct iscsi_cmd_task *ctask = NULL; | |
816 | ||
817 | sc->scsi_done = done; | |
818 | sc->result = 0; | |
f47f2cf5 | 819 | sc->SCp.ptr = NULL; |
7996a778 MC |
820 | |
821 | host = sc->device->host; | |
822 | session = iscsi_hostdata(host->hostdata); | |
823 | ||
824 | spin_lock(&session->lock); | |
825 | ||
656cffc9 MC |
826 | /* |
827 | * ISCSI_STATE_FAILED is a temp. state. The recovery | |
828 | * code will decide what is best to do with command queued | |
829 | * during this time | |
830 | */ | |
831 | if (session->state != ISCSI_STATE_LOGGED_IN && | |
832 | session->state != ISCSI_STATE_FAILED) { | |
833 | /* | |
834 | * to handle the race between when we set the recovery state | |
835 | * and block the session we requeue here (commands could | |
836 | * be entering our queuecommand while a block is starting | |
837 | * up because the block code is not locked) | |
838 | */ | |
839 | if (session->state == ISCSI_STATE_IN_RECOVERY) { | |
840 | reason = FAILURE_SESSION_IN_RECOVERY; | |
67a61114 | 841 | goto reject; |
7996a778 | 842 | } |
656cffc9 MC |
843 | |
844 | if (session->state == ISCSI_STATE_RECOVERY_FAILED) | |
845 | reason = FAILURE_SESSION_RECOVERY_TIMEOUT; | |
846 | else if (session->state == ISCSI_STATE_TERMINATE) | |
847 | reason = FAILURE_SESSION_TERMINATE; | |
848 | else | |
849 | reason = FAILURE_SESSION_FREED; | |
7996a778 MC |
850 | goto fault; |
851 | } | |
852 | ||
7996a778 | 853 | conn = session->leadconn; |
98644047 MC |
854 | if (!conn) { |
855 | reason = FAILURE_SESSION_FREED; | |
856 | goto fault; | |
857 | } | |
7996a778 | 858 | |
77a23c21 MC |
859 | if (iscsi_check_cmdsn_window_closed(conn)) { |
860 | reason = FAILURE_WINDOW_CLOSED; | |
861 | goto reject; | |
862 | } | |
863 | ||
60ecebf5 MC |
864 | if (!__kfifo_get(session->cmdpool.queue, (void*)&ctask, |
865 | sizeof(void*))) { | |
866 | reason = FAILURE_OOM; | |
867 | goto reject; | |
868 | } | |
e0726407 MC |
869 | session->queued_cmdsn++; |
870 | ||
7996a778 MC |
871 | sc->SCp.phase = session->age; |
872 | sc->SCp.ptr = (char *)ctask; | |
873 | ||
60ecebf5 | 874 | atomic_set(&ctask->refcount, 1); |
b6c395ed | 875 | ctask->state = ISCSI_TASK_PENDING; |
7996a778 MC |
876 | ctask->conn = conn; |
877 | ctask->sc = sc; | |
878 | INIT_LIST_HEAD(&ctask->running); | |
7996a778 | 879 | |
b6c395ed | 880 | list_add_tail(&ctask->running, &conn->xmitqueue); |
7996a778 MC |
881 | spin_unlock(&session->lock); |
882 | ||
883 | scsi_queue_work(host, &conn->xmitwork); | |
884 | return 0; | |
885 | ||
886 | reject: | |
887 | spin_unlock(&session->lock); | |
888 | debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason); | |
889 | return SCSI_MLQUEUE_HOST_BUSY; | |
890 | ||
891 | fault: | |
892 | spin_unlock(&session->lock); | |
be2df72e | 893 | printk(KERN_ERR "iscsi: cmd 0x%x is not queued (%d)\n", |
7996a778 MC |
894 | sc->cmnd[0], reason); |
895 | sc->result = (DID_NO_CONNECT << 16); | |
1c138991 | 896 | scsi_set_resid(sc, scsi_bufflen(sc)); |
7996a778 MC |
897 | sc->scsi_done(sc); |
898 | return 0; | |
899 | } | |
900 | EXPORT_SYMBOL_GPL(iscsi_queuecommand); | |
901 | ||
902 | int iscsi_change_queue_depth(struct scsi_device *sdev, int depth) | |
903 | { | |
904 | if (depth > ISCSI_MAX_CMD_PER_LUN) | |
905 | depth = ISCSI_MAX_CMD_PER_LUN; | |
906 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); | |
907 | return sdev->queue_depth; | |
908 | } | |
909 | EXPORT_SYMBOL_GPL(iscsi_change_queue_depth); | |
910 | ||
77a23c21 MC |
911 | static struct iscsi_mgmt_task * |
912 | __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
913 | char *data, uint32_t data_size) | |
7996a778 MC |
914 | { |
915 | struct iscsi_session *session = conn->session; | |
7996a778 MC |
916 | struct iscsi_mgmt_task *mtask; |
917 | ||
77a23c21 MC |
918 | if (session->state == ISCSI_STATE_TERMINATE) |
919 | return NULL; | |
920 | ||
7996a778 MC |
921 | if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) || |
922 | hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE)) | |
923 | /* | |
924 | * Login and Text are sent serially, in | |
925 | * request-followed-by-response sequence. | |
926 | * Same mtask can be used. Same ITT must be used. | |
927 | * Note that login_mtask is preallocated at conn_create(). | |
928 | */ | |
929 | mtask = conn->login_mtask; | |
930 | else { | |
656cffc9 MC |
931 | BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); |
932 | BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); | |
7996a778 MC |
933 | |
934 | if (!__kfifo_get(session->mgmtpool.queue, | |
77a23c21 MC |
935 | (void*)&mtask, sizeof(void*))) |
936 | return NULL; | |
7996a778 MC |
937 | } |
938 | ||
7996a778 MC |
939 | if (data_size) { |
940 | memcpy(mtask->data, data, data_size); | |
941 | mtask->data_count = data_size; | |
942 | } else | |
943 | mtask->data_count = 0; | |
944 | ||
7996a778 | 945 | memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr)); |
843c0a8a MC |
946 | INIT_LIST_HEAD(&mtask->running); |
947 | list_add_tail(&mtask->running, &conn->mgmtqueue); | |
77a23c21 | 948 | return mtask; |
7996a778 MC |
949 | } |
950 | ||
951 | int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, | |
952 | char *data, uint32_t data_size) | |
953 | { | |
954 | struct iscsi_conn *conn = cls_conn->dd_data; | |
77a23c21 MC |
955 | struct iscsi_session *session = conn->session; |
956 | int err = 0; | |
7996a778 | 957 | |
77a23c21 MC |
958 | spin_lock_bh(&session->lock); |
959 | if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size)) | |
960 | err = -EPERM; | |
961 | spin_unlock_bh(&session->lock); | |
962 | scsi_queue_work(session->host, &conn->xmitwork); | |
963 | return err; | |
7996a778 MC |
964 | } |
965 | EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); | |
966 | ||
967 | void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session) | |
968 | { | |
969 | struct iscsi_session *session = class_to_transport_session(cls_session); | |
7996a778 MC |
970 | |
971 | spin_lock_bh(&session->lock); | |
972 | if (session->state != ISCSI_STATE_LOGGED_IN) { | |
656cffc9 | 973 | session->state = ISCSI_STATE_RECOVERY_FAILED; |
843c0a8a MC |
974 | if (session->leadconn) |
975 | wake_up(&session->leadconn->ehwait); | |
7996a778 MC |
976 | } |
977 | spin_unlock_bh(&session->lock); | |
978 | } | |
979 | EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout); | |
980 | ||
981 | int iscsi_eh_host_reset(struct scsi_cmnd *sc) | |
982 | { | |
983 | struct Scsi_Host *host = sc->device->host; | |
984 | struct iscsi_session *session = iscsi_hostdata(host->hostdata); | |
985 | struct iscsi_conn *conn = session->leadconn; | |
7996a778 MC |
986 | |
987 | spin_lock_bh(&session->lock); | |
988 | if (session->state == ISCSI_STATE_TERMINATE) { | |
989 | failed: | |
990 | debug_scsi("failing host reset: session terminated " | |
d6e24d1c | 991 | "[CID %d age %d]\n", conn->id, session->age); |
7996a778 MC |
992 | spin_unlock_bh(&session->lock); |
993 | return FAILED; | |
994 | } | |
995 | ||
7996a778 MC |
996 | spin_unlock_bh(&session->lock); |
997 | ||
998 | /* | |
999 | * we drop the lock here but the leadconn cannot be destoyed while | |
1000 | * we are in the scsi eh | |
1001 | */ | |
843c0a8a | 1002 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
7996a778 MC |
1003 | |
1004 | debug_scsi("iscsi_eh_host_reset wait for relogin\n"); | |
1005 | wait_event_interruptible(conn->ehwait, | |
1006 | session->state == ISCSI_STATE_TERMINATE || | |
1007 | session->state == ISCSI_STATE_LOGGED_IN || | |
656cffc9 | 1008 | session->state == ISCSI_STATE_RECOVERY_FAILED); |
7996a778 MC |
1009 | if (signal_pending(current)) |
1010 | flush_signals(current); | |
1011 | ||
1012 | spin_lock_bh(&session->lock); | |
1013 | if (session->state == ISCSI_STATE_LOGGED_IN) | |
be2df72e | 1014 | printk(KERN_INFO "iscsi: host reset succeeded\n"); |
7996a778 MC |
1015 | else |
1016 | goto failed; | |
1017 | spin_unlock_bh(&session->lock); | |
1018 | ||
1019 | return SUCCESS; | |
1020 | } | |
1021 | EXPORT_SYMBOL_GPL(iscsi_eh_host_reset); | |
1022 | ||
843c0a8a | 1023 | static void iscsi_tmf_timedout(unsigned long data) |
7996a778 | 1024 | { |
843c0a8a | 1025 | struct iscsi_conn *conn = (struct iscsi_conn *)data; |
7996a778 MC |
1026 | struct iscsi_session *session = conn->session; |
1027 | ||
1028 | spin_lock(&session->lock); | |
843c0a8a MC |
1029 | if (conn->tmf_state == TMF_QUEUED) { |
1030 | conn->tmf_state = TMF_TIMEDOUT; | |
1031 | debug_scsi("tmf timedout\n"); | |
7996a778 MC |
1032 | /* unblock eh_abort() */ |
1033 | wake_up(&conn->ehwait); | |
1034 | } | |
1035 | spin_unlock(&session->lock); | |
1036 | } | |
1037 | ||
843c0a8a MC |
1038 | static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn, |
1039 | struct iscsi_tm *hdr, int age) | |
7996a778 | 1040 | { |
7996a778 | 1041 | struct iscsi_session *session = conn->session; |
843c0a8a | 1042 | struct iscsi_mgmt_task *mtask; |
7996a778 | 1043 | |
843c0a8a MC |
1044 | mtask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr, |
1045 | NULL, 0); | |
1046 | if (!mtask) { | |
6724add1 | 1047 | spin_unlock_bh(&session->lock); |
7996a778 | 1048 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
843c0a8a MC |
1049 | spin_lock_bh(&session->lock); |
1050 | debug_scsi("tmf exec failure\n"); | |
77a23c21 | 1051 | return -EPERM; |
7996a778 | 1052 | } |
843c0a8a MC |
1053 | conn->tmfcmd_pdus_cnt++; |
1054 | conn->tmf_timer.expires = 30 * HZ + jiffies; | |
1055 | conn->tmf_timer.function = iscsi_tmf_timedout; | |
1056 | conn->tmf_timer.data = (unsigned long)conn; | |
1057 | add_timer(&conn->tmf_timer); | |
1058 | debug_scsi("tmf set timeout\n"); | |
7996a778 | 1059 | |
7996a778 | 1060 | spin_unlock_bh(&session->lock); |
6724add1 | 1061 | mutex_unlock(&session->eh_mutex); |
77a23c21 | 1062 | scsi_queue_work(session->host, &conn->xmitwork); |
7996a778 MC |
1063 | |
1064 | /* | |
1065 | * block eh thread until: | |
1066 | * | |
843c0a8a MC |
1067 | * 1) tmf response |
1068 | * 2) tmf timeout | |
7996a778 MC |
1069 | * 3) session is terminated or restarted or userspace has |
1070 | * given up on recovery | |
1071 | */ | |
843c0a8a | 1072 | wait_event_interruptible(conn->ehwait, age != session->age || |
7996a778 | 1073 | session->state != ISCSI_STATE_LOGGED_IN || |
843c0a8a | 1074 | conn->tmf_state != TMF_QUEUED); |
7996a778 MC |
1075 | if (signal_pending(current)) |
1076 | flush_signals(current); | |
843c0a8a MC |
1077 | del_timer_sync(&conn->tmf_timer); |
1078 | ||
6724add1 | 1079 | mutex_lock(&session->eh_mutex); |
77a23c21 | 1080 | spin_lock_bh(&session->lock); |
843c0a8a MC |
1081 | /* if the session drops it will clean up the mtask */ |
1082 | if (age != session->age || | |
1083 | session->state != ISCSI_STATE_LOGGED_IN) | |
1084 | return -ENOTCONN; | |
7996a778 | 1085 | |
843c0a8a MC |
1086 | if (!list_empty(&mtask->running)) { |
1087 | list_del_init(&mtask->running); | |
1088 | __kfifo_put(session->mgmtpool.queue, (void*)&mtask, | |
1089 | sizeof(void*)); | |
b6c395ed | 1090 | } |
7996a778 MC |
1091 | return 0; |
1092 | } | |
1093 | ||
1094 | /* | |
77a23c21 | 1095 | * session lock must be held |
7996a778 MC |
1096 | */ |
1097 | static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, | |
1098 | int err) | |
1099 | { | |
1100 | struct scsi_cmnd *sc; | |
1101 | ||
7996a778 MC |
1102 | sc = ctask->sc; |
1103 | if (!sc) | |
1104 | return; | |
e648f63c | 1105 | |
e0726407 MC |
1106 | if (ctask->state == ISCSI_TASK_PENDING) |
1107 | /* | |
1108 | * cmd never made it to the xmit thread, so we should not count | |
1109 | * the cmd in the sequencing | |
1110 | */ | |
1111 | conn->session->queued_cmdsn--; | |
1112 | else | |
77a23c21 | 1113 | conn->session->tt->cleanup_cmd_task(conn, ctask); |
7ea8b828 | 1114 | |
7996a778 | 1115 | sc->result = err; |
1c138991 | 1116 | scsi_set_resid(sc, scsi_bufflen(sc)); |
77a23c21 MC |
1117 | if (conn->ctask == ctask) |
1118 | conn->ctask = NULL; | |
e648f63c | 1119 | /* release ref from queuecommand */ |
60ecebf5 | 1120 | __iscsi_put_ctask(ctask); |
7996a778 MC |
1121 | } |
1122 | ||
843c0a8a MC |
1123 | /* |
1124 | * Fail commands. session lock held and recv side suspended and xmit | |
1125 | * thread flushed | |
1126 | */ | |
1127 | static void fail_all_commands(struct iscsi_conn *conn, unsigned lun) | |
1128 | { | |
1129 | struct iscsi_cmd_task *ctask, *tmp; | |
1130 | ||
1131 | if (conn->ctask && (conn->ctask->sc->device->lun == lun || lun == -1)) | |
1132 | conn->ctask = NULL; | |
1133 | ||
1134 | /* flush pending */ | |
1135 | list_for_each_entry_safe(ctask, tmp, &conn->xmitqueue, running) { | |
1136 | if (lun == ctask->sc->device->lun || lun == -1) { | |
1137 | debug_scsi("failing pending sc %p itt 0x%x\n", | |
1138 | ctask->sc, ctask->itt); | |
1139 | fail_command(conn, ctask, DID_BUS_BUSY << 16); | |
1140 | } | |
1141 | } | |
1142 | ||
1143 | list_for_each_entry_safe(ctask, tmp, &conn->requeue, running) { | |
1144 | if (lun == ctask->sc->device->lun || lun == -1) { | |
1145 | debug_scsi("failing requeued sc %p itt 0x%x\n", | |
1146 | ctask->sc, ctask->itt); | |
1147 | fail_command(conn, ctask, DID_BUS_BUSY << 16); | |
1148 | } | |
1149 | } | |
1150 | ||
1151 | /* fail all other running */ | |
1152 | list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) { | |
1153 | if (lun == ctask->sc->device->lun || lun == -1) { | |
1154 | debug_scsi("failing in progress sc %p itt 0x%x\n", | |
1155 | ctask->sc, ctask->itt); | |
1156 | fail_command(conn, ctask, DID_BUS_BUSY << 16); | |
1157 | } | |
1158 | } | |
1159 | } | |
1160 | ||
6724add1 MC |
1161 | static void iscsi_suspend_tx(struct iscsi_conn *conn) |
1162 | { | |
1163 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
1164 | scsi_flush_work(conn->session->host); | |
1165 | } | |
1166 | ||
1167 | static void iscsi_start_tx(struct iscsi_conn *conn) | |
1168 | { | |
1169 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
1170 | scsi_queue_work(conn->session->host, &conn->xmitwork); | |
1171 | } | |
1172 | ||
843c0a8a MC |
1173 | static void iscsi_prep_abort_task_pdu(struct iscsi_cmd_task *ctask, |
1174 | struct iscsi_tm *hdr) | |
1175 | { | |
1176 | memset(hdr, 0, sizeof(*hdr)); | |
1177 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
1178 | hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK; | |
1179 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
1180 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); | |
1181 | hdr->rtt = ctask->hdr->itt; | |
1182 | hdr->refcmdsn = ctask->hdr->cmdsn; | |
1183 | } | |
1184 | ||
7996a778 MC |
1185 | int iscsi_eh_abort(struct scsi_cmnd *sc) |
1186 | { | |
6724add1 MC |
1187 | struct Scsi_Host *host = sc->device->host; |
1188 | struct iscsi_session *session = iscsi_hostdata(host->hostdata); | |
f47f2cf5 | 1189 | struct iscsi_conn *conn; |
843c0a8a MC |
1190 | struct iscsi_cmd_task *ctask; |
1191 | struct iscsi_tm *hdr; | |
1192 | int rc, age; | |
7996a778 | 1193 | |
6724add1 MC |
1194 | mutex_lock(&session->eh_mutex); |
1195 | spin_lock_bh(&session->lock); | |
f47f2cf5 MC |
1196 | /* |
1197 | * if session was ISCSI_STATE_IN_RECOVERY then we may not have | |
1198 | * got the command. | |
1199 | */ | |
1200 | if (!sc->SCp.ptr) { | |
1201 | debug_scsi("sc never reached iscsi layer or it completed.\n"); | |
6724add1 MC |
1202 | spin_unlock_bh(&session->lock); |
1203 | mutex_unlock(&session->eh_mutex); | |
f47f2cf5 MC |
1204 | return SUCCESS; |
1205 | } | |
1206 | ||
7996a778 MC |
1207 | /* |
1208 | * If we are not logged in or we have started a new session | |
1209 | * then let the host reset code handle this | |
1210 | */ | |
843c0a8a MC |
1211 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN || |
1212 | sc->SCp.phase != session->age) { | |
1213 | spin_unlock_bh(&session->lock); | |
1214 | mutex_unlock(&session->eh_mutex); | |
1215 | return FAILED; | |
1216 | } | |
1217 | ||
1218 | conn = session->leadconn; | |
1219 | conn->eh_abort_cnt++; | |
1220 | age = session->age; | |
1221 | ||
1222 | ctask = (struct iscsi_cmd_task *)sc->SCp.ptr; | |
1223 | debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt); | |
7996a778 MC |
1224 | |
1225 | /* ctask completed before time out */ | |
7ea8b828 | 1226 | if (!ctask->sc) { |
7ea8b828 | 1227 | debug_scsi("sc completed while abort in progress\n"); |
77a23c21 | 1228 | goto success; |
7ea8b828 | 1229 | } |
7996a778 | 1230 | |
77a23c21 MC |
1231 | if (ctask->state == ISCSI_TASK_PENDING) { |
1232 | fail_command(conn, ctask, DID_ABORT << 16); | |
1233 | goto success; | |
1234 | } | |
7996a778 | 1235 | |
843c0a8a MC |
1236 | /* only have one tmf outstanding at a time */ |
1237 | if (conn->tmf_state != TMF_INITIAL) | |
7996a778 | 1238 | goto failed; |
843c0a8a | 1239 | conn->tmf_state = TMF_QUEUED; |
7996a778 | 1240 | |
843c0a8a MC |
1241 | hdr = &conn->tmhdr; |
1242 | iscsi_prep_abort_task_pdu(ctask, hdr); | |
1243 | ||
1244 | if (iscsi_exec_task_mgmt_fn(conn, hdr, age)) { | |
1245 | rc = FAILED; | |
1246 | goto failed; | |
1247 | } | |
1248 | ||
1249 | switch (conn->tmf_state) { | |
1250 | case TMF_SUCCESS: | |
77a23c21 | 1251 | spin_unlock_bh(&session->lock); |
6724add1 | 1252 | iscsi_suspend_tx(conn); |
77a23c21 MC |
1253 | /* |
1254 | * clean up task if aborted. grab the recv lock as a writer | |
1255 | */ | |
1256 | write_lock_bh(conn->recv_lock); | |
1257 | spin_lock(&session->lock); | |
1258 | fail_command(conn, ctask, DID_ABORT << 16); | |
843c0a8a | 1259 | conn->tmf_state = TMF_INITIAL; |
77a23c21 MC |
1260 | spin_unlock(&session->lock); |
1261 | write_unlock_bh(conn->recv_lock); | |
6724add1 | 1262 | iscsi_start_tx(conn); |
77a23c21 | 1263 | goto success_unlocked; |
843c0a8a MC |
1264 | case TMF_TIMEDOUT: |
1265 | spin_unlock_bh(&session->lock); | |
1266 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1267 | goto failed_unlocked; | |
1268 | case TMF_NOT_FOUND: | |
1269 | if (!sc->SCp.ptr) { | |
1270 | conn->tmf_state = TMF_INITIAL; | |
7ea8b828 | 1271 | /* ctask completed before tmf abort response */ |
7ea8b828 | 1272 | debug_scsi("sc completed while abort in progress\n"); |
77a23c21 | 1273 | goto success; |
7ea8b828 MC |
1274 | } |
1275 | /* fall through */ | |
1276 | default: | |
843c0a8a MC |
1277 | conn->tmf_state = TMF_INITIAL; |
1278 | goto failed; | |
7996a778 MC |
1279 | } |
1280 | ||
77a23c21 | 1281 | success: |
7996a778 | 1282 | spin_unlock_bh(&session->lock); |
77a23c21 MC |
1283 | success_unlocked: |
1284 | debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); | |
6724add1 | 1285 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1286 | return SUCCESS; |
1287 | ||
1288 | failed: | |
1289 | spin_unlock_bh(&session->lock); | |
77a23c21 | 1290 | failed_unlocked: |
843c0a8a MC |
1291 | debug_scsi("abort failed [sc %p itt 0x%x]\n", sc, |
1292 | ctask ? ctask->itt : 0); | |
6724add1 | 1293 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1294 | return FAILED; |
1295 | } | |
1296 | EXPORT_SYMBOL_GPL(iscsi_eh_abort); | |
1297 | ||
843c0a8a MC |
1298 | static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) |
1299 | { | |
1300 | memset(hdr, 0, sizeof(*hdr)); | |
1301 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
1302 | hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK; | |
1303 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
1304 | int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun); | |
1305 | hdr->rtt = ISCSI_RESERVED_TAG; | |
1306 | } | |
1307 | ||
1308 | int iscsi_eh_device_reset(struct scsi_cmnd *sc) | |
1309 | { | |
1310 | struct Scsi_Host *host = sc->device->host; | |
1311 | struct iscsi_session *session = iscsi_hostdata(host->hostdata); | |
1312 | struct iscsi_conn *conn; | |
1313 | struct iscsi_tm *hdr; | |
1314 | int rc = FAILED; | |
1315 | ||
1316 | debug_scsi("LU Reset [sc %p lun %u]\n", sc, sc->device->lun); | |
1317 | ||
1318 | mutex_lock(&session->eh_mutex); | |
1319 | spin_lock_bh(&session->lock); | |
1320 | /* | |
1321 | * Just check if we are not logged in. We cannot check for | |
1322 | * the phase because the reset could come from a ioctl. | |
1323 | */ | |
1324 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) | |
1325 | goto unlock; | |
1326 | conn = session->leadconn; | |
1327 | ||
1328 | /* only have one tmf outstanding at a time */ | |
1329 | if (conn->tmf_state != TMF_INITIAL) | |
1330 | goto unlock; | |
1331 | conn->tmf_state = TMF_QUEUED; | |
1332 | ||
1333 | hdr = &conn->tmhdr; | |
1334 | iscsi_prep_lun_reset_pdu(sc, hdr); | |
1335 | ||
1336 | if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age)) { | |
1337 | rc = FAILED; | |
1338 | goto unlock; | |
1339 | } | |
1340 | ||
1341 | switch (conn->tmf_state) { | |
1342 | case TMF_SUCCESS: | |
1343 | break; | |
1344 | case TMF_TIMEDOUT: | |
1345 | spin_unlock_bh(&session->lock); | |
1346 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1347 | goto done; | |
1348 | default: | |
1349 | conn->tmf_state = TMF_INITIAL; | |
1350 | goto unlock; | |
1351 | } | |
1352 | ||
1353 | rc = SUCCESS; | |
1354 | spin_unlock_bh(&session->lock); | |
1355 | ||
1356 | iscsi_suspend_tx(conn); | |
1357 | /* need to grab the recv lock then session lock */ | |
1358 | write_lock_bh(conn->recv_lock); | |
1359 | spin_lock(&session->lock); | |
1360 | fail_all_commands(conn, sc->device->lun); | |
1361 | conn->tmf_state = TMF_INITIAL; | |
1362 | spin_unlock(&session->lock); | |
1363 | write_unlock_bh(conn->recv_lock); | |
1364 | ||
1365 | iscsi_start_tx(conn); | |
1366 | goto done; | |
1367 | ||
1368 | unlock: | |
1369 | spin_unlock_bh(&session->lock); | |
1370 | done: | |
1371 | debug_scsi("iscsi_eh_device_reset %s\n", | |
1372 | rc == SUCCESS ? "SUCCESS" : "FAILED"); | |
1373 | mutex_unlock(&session->eh_mutex); | |
1374 | return rc; | |
1375 | } | |
1376 | EXPORT_SYMBOL_GPL(iscsi_eh_device_reset); | |
1377 | ||
7996a778 MC |
1378 | int |
1379 | iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size) | |
1380 | { | |
1381 | int i; | |
1382 | ||
1383 | *items = kmalloc(max * sizeof(void*), GFP_KERNEL); | |
1384 | if (*items == NULL) | |
1385 | return -ENOMEM; | |
1386 | ||
1387 | q->max = max; | |
1388 | q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL); | |
1389 | if (q->pool == NULL) { | |
1390 | kfree(*items); | |
1391 | return -ENOMEM; | |
1392 | } | |
1393 | ||
1394 | q->queue = kfifo_init((void*)q->pool, max * sizeof(void*), | |
1395 | GFP_KERNEL, NULL); | |
1396 | if (q->queue == ERR_PTR(-ENOMEM)) { | |
1397 | kfree(q->pool); | |
1398 | kfree(*items); | |
1399 | return -ENOMEM; | |
1400 | } | |
1401 | ||
1402 | for (i = 0; i < max; i++) { | |
1403 | q->pool[i] = kmalloc(item_size, GFP_KERNEL); | |
1404 | if (q->pool[i] == NULL) { | |
1405 | int j; | |
1406 | ||
1407 | for (j = 0; j < i; j++) | |
1408 | kfree(q->pool[j]); | |
1409 | ||
1410 | kfifo_free(q->queue); | |
1411 | kfree(q->pool); | |
1412 | kfree(*items); | |
1413 | return -ENOMEM; | |
1414 | } | |
1415 | memset(q->pool[i], 0, item_size); | |
1416 | (*items)[i] = q->pool[i]; | |
1417 | __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*)); | |
1418 | } | |
1419 | return 0; | |
1420 | } | |
1421 | EXPORT_SYMBOL_GPL(iscsi_pool_init); | |
1422 | ||
1423 | void iscsi_pool_free(struct iscsi_queue *q, void **items) | |
1424 | { | |
1425 | int i; | |
1426 | ||
1427 | for (i = 0; i < q->max; i++) | |
1428 | kfree(items[i]); | |
1429 | kfree(q->pool); | |
1430 | kfree(items); | |
1431 | } | |
1432 | EXPORT_SYMBOL_GPL(iscsi_pool_free); | |
1433 | ||
1434 | /* | |
1435 | * iSCSI Session's hostdata organization: | |
1436 | * | |
1437 | * *------------------* <== hostdata_session(host->hostdata) | |
1438 | * | ptr to class sess| | |
1439 | * |------------------| <== iscsi_hostdata(host->hostdata) | |
1440 | * | iscsi_session | | |
1441 | * *------------------* | |
1442 | */ | |
1443 | ||
1444 | #define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \ | |
1445 | _sz % sizeof(unsigned long)) | |
1446 | ||
1447 | #define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata)) | |
1448 | ||
1449 | /** | |
1450 | * iscsi_session_setup - create iscsi cls session and host and session | |
1451 | * @scsit: scsi transport template | |
1452 | * @iscsit: iscsi transport template | |
1548271e MC |
1453 | * @cmds_max: scsi host can queue |
1454 | * @qdepth: scsi host cmds per lun | |
1455 | * @cmd_task_size: LLD ctask private data size | |
1456 | * @mgmt_task_size: LLD mtask private data size | |
7996a778 MC |
1457 | * @initial_cmdsn: initial CmdSN |
1458 | * @hostno: host no allocated | |
1459 | * | |
1460 | * This can be used by software iscsi_transports that allocate | |
1461 | * a session per scsi host. | |
1462 | **/ | |
1463 | struct iscsi_cls_session * | |
1464 | iscsi_session_setup(struct iscsi_transport *iscsit, | |
1465 | struct scsi_transport_template *scsit, | |
1548271e | 1466 | uint16_t cmds_max, uint16_t qdepth, |
7996a778 MC |
1467 | int cmd_task_size, int mgmt_task_size, |
1468 | uint32_t initial_cmdsn, uint32_t *hostno) | |
1469 | { | |
1470 | struct Scsi_Host *shost; | |
1471 | struct iscsi_session *session; | |
1472 | struct iscsi_cls_session *cls_session; | |
1473 | int cmd_i; | |
1474 | ||
1548271e MC |
1475 | if (qdepth > ISCSI_MAX_CMD_PER_LUN || qdepth < 1) { |
1476 | if (qdepth != 0) | |
1477 | printk(KERN_ERR "iscsi: invalid queue depth of %d. " | |
1478 | "Queue depth must be between 1 and %d.\n", | |
1479 | qdepth, ISCSI_MAX_CMD_PER_LUN); | |
1480 | qdepth = ISCSI_DEF_CMD_PER_LUN; | |
1481 | } | |
1482 | ||
1483 | if (cmds_max < 2 || (cmds_max & (cmds_max - 1)) || | |
1484 | cmds_max >= ISCSI_MGMT_ITT_OFFSET) { | |
1485 | if (cmds_max != 0) | |
1486 | printk(KERN_ERR "iscsi: invalid can_queue of %d. " | |
1487 | "can_queue must be a power of 2 and between " | |
1488 | "2 and %d - setting to %d.\n", cmds_max, | |
1489 | ISCSI_MGMT_ITT_OFFSET, ISCSI_DEF_XMIT_CMDS_MAX); | |
1490 | cmds_max = ISCSI_DEF_XMIT_CMDS_MAX; | |
1491 | } | |
1492 | ||
7996a778 MC |
1493 | shost = scsi_host_alloc(iscsit->host_template, |
1494 | hostdata_privsize(sizeof(*session))); | |
1495 | if (!shost) | |
1496 | return NULL; | |
1497 | ||
1548271e MC |
1498 | /* the iscsi layer takes one task for reserve */ |
1499 | shost->can_queue = cmds_max - 1; | |
1500 | shost->cmd_per_lun = qdepth; | |
7996a778 MC |
1501 | shost->max_id = 1; |
1502 | shost->max_channel = 0; | |
1503 | shost->max_lun = iscsit->max_lun; | |
1504 | shost->max_cmd_len = iscsit->max_cmd_len; | |
1505 | shost->transportt = scsit; | |
1506 | shost->transportt->create_work_queue = 1; | |
1507 | *hostno = shost->host_no; | |
1508 | ||
1509 | session = iscsi_hostdata(shost->hostdata); | |
1510 | memset(session, 0, sizeof(struct iscsi_session)); | |
1511 | session->host = shost; | |
1512 | session->state = ISCSI_STATE_FREE; | |
1513 | session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX; | |
1548271e | 1514 | session->cmds_max = cmds_max; |
e0726407 | 1515 | session->queued_cmdsn = session->cmdsn = initial_cmdsn; |
7996a778 MC |
1516 | session->exp_cmdsn = initial_cmdsn + 1; |
1517 | session->max_cmdsn = initial_cmdsn + 1; | |
1518 | session->max_r2t = 1; | |
1519 | session->tt = iscsit; | |
6724add1 | 1520 | mutex_init(&session->eh_mutex); |
7996a778 MC |
1521 | |
1522 | /* initialize SCSI PDU commands pool */ | |
1523 | if (iscsi_pool_init(&session->cmdpool, session->cmds_max, | |
1524 | (void***)&session->cmds, | |
1525 | cmd_task_size + sizeof(struct iscsi_cmd_task))) | |
1526 | goto cmdpool_alloc_fail; | |
1527 | ||
1528 | /* pre-format cmds pool with ITT */ | |
1529 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
1530 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; | |
1531 | ||
1532 | if (cmd_task_size) | |
1533 | ctask->dd_data = &ctask[1]; | |
1534 | ctask->itt = cmd_i; | |
b6c395ed | 1535 | INIT_LIST_HEAD(&ctask->running); |
7996a778 MC |
1536 | } |
1537 | ||
1538 | spin_lock_init(&session->lock); | |
7996a778 MC |
1539 | |
1540 | /* initialize immediate command pool */ | |
1541 | if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max, | |
1542 | (void***)&session->mgmt_cmds, | |
1543 | mgmt_task_size + sizeof(struct iscsi_mgmt_task))) | |
1544 | goto mgmtpool_alloc_fail; | |
1545 | ||
1546 | ||
1547 | /* pre-format immediate cmds pool with ITT */ | |
1548 | for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) { | |
1549 | struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i]; | |
1550 | ||
1551 | if (mgmt_task_size) | |
1552 | mtask->dd_data = &mtask[1]; | |
1553 | mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i; | |
b6c395ed | 1554 | INIT_LIST_HEAD(&mtask->running); |
7996a778 MC |
1555 | } |
1556 | ||
1557 | if (scsi_add_host(shost, NULL)) | |
1558 | goto add_host_fail; | |
1559 | ||
f53a88da MC |
1560 | if (!try_module_get(iscsit->owner)) |
1561 | goto cls_session_fail; | |
1562 | ||
6a8a0d36 | 1563 | cls_session = iscsi_create_session(shost, iscsit, 0); |
7996a778 | 1564 | if (!cls_session) |
f53a88da | 1565 | goto module_put; |
7996a778 MC |
1566 | *(unsigned long*)shost->hostdata = (unsigned long)cls_session; |
1567 | ||
1568 | return cls_session; | |
1569 | ||
f53a88da MC |
1570 | module_put: |
1571 | module_put(iscsit->owner); | |
7996a778 MC |
1572 | cls_session_fail: |
1573 | scsi_remove_host(shost); | |
1574 | add_host_fail: | |
7996a778 MC |
1575 | iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds); |
1576 | mgmtpool_alloc_fail: | |
1577 | iscsi_pool_free(&session->cmdpool, (void**)session->cmds); | |
1578 | cmdpool_alloc_fail: | |
1579 | scsi_host_put(shost); | |
1580 | return NULL; | |
1581 | } | |
1582 | EXPORT_SYMBOL_GPL(iscsi_session_setup); | |
1583 | ||
1584 | /** | |
1585 | * iscsi_session_teardown - destroy session, host, and cls_session | |
1586 | * shost: scsi host | |
1587 | * | |
1588 | * This can be used by software iscsi_transports that allocate | |
1589 | * a session per scsi host. | |
1590 | **/ | |
1591 | void iscsi_session_teardown(struct iscsi_cls_session *cls_session) | |
1592 | { | |
1593 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); | |
1594 | struct iscsi_session *session = iscsi_hostdata(shost->hostdata); | |
63f75cc8 | 1595 | struct module *owner = cls_session->transport->owner; |
7996a778 | 1596 | |
464bb99e | 1597 | iscsi_unblock_session(cls_session); |
7996a778 MC |
1598 | scsi_remove_host(shost); |
1599 | ||
7996a778 MC |
1600 | iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds); |
1601 | iscsi_pool_free(&session->cmdpool, (void**)session->cmds); | |
1602 | ||
b2c64167 MC |
1603 | kfree(session->password); |
1604 | kfree(session->password_in); | |
1605 | kfree(session->username); | |
1606 | kfree(session->username_in); | |
f3ff0c36 | 1607 | kfree(session->targetname); |
d8196ed2 | 1608 | kfree(session->netdev); |
0801c242 | 1609 | kfree(session->hwaddress); |
8ad5781a | 1610 | kfree(session->initiatorname); |
f3ff0c36 | 1611 | |
7996a778 MC |
1612 | iscsi_destroy_session(cls_session); |
1613 | scsi_host_put(shost); | |
63f75cc8 | 1614 | module_put(owner); |
7996a778 MC |
1615 | } |
1616 | EXPORT_SYMBOL_GPL(iscsi_session_teardown); | |
1617 | ||
1618 | /** | |
1619 | * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn | |
1620 | * @cls_session: iscsi_cls_session | |
1621 | * @conn_idx: cid | |
1622 | **/ | |
1623 | struct iscsi_cls_conn * | |
1624 | iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx) | |
1625 | { | |
1626 | struct iscsi_session *session = class_to_transport_session(cls_session); | |
1627 | struct iscsi_conn *conn; | |
1628 | struct iscsi_cls_conn *cls_conn; | |
d36ab6f3 | 1629 | char *data; |
7996a778 MC |
1630 | |
1631 | cls_conn = iscsi_create_conn(cls_session, conn_idx); | |
1632 | if (!cls_conn) | |
1633 | return NULL; | |
1634 | conn = cls_conn->dd_data; | |
1635 | memset(conn, 0, sizeof(*conn)); | |
1636 | ||
1637 | conn->session = session; | |
1638 | conn->cls_conn = cls_conn; | |
1639 | conn->c_stage = ISCSI_CONN_INITIAL_STAGE; | |
1640 | conn->id = conn_idx; | |
1641 | conn->exp_statsn = 0; | |
843c0a8a | 1642 | conn->tmf_state = TMF_INITIAL; |
7996a778 MC |
1643 | INIT_LIST_HEAD(&conn->run_list); |
1644 | INIT_LIST_HEAD(&conn->mgmt_run_list); | |
843c0a8a | 1645 | INIT_LIST_HEAD(&conn->mgmtqueue); |
b6c395ed | 1646 | INIT_LIST_HEAD(&conn->xmitqueue); |
843c0a8a | 1647 | INIT_LIST_HEAD(&conn->requeue); |
c4028958 | 1648 | INIT_WORK(&conn->xmitwork, iscsi_xmitworker); |
7996a778 MC |
1649 | |
1650 | /* allocate login_mtask used for the login/text sequences */ | |
1651 | spin_lock_bh(&session->lock); | |
1652 | if (!__kfifo_get(session->mgmtpool.queue, | |
1653 | (void*)&conn->login_mtask, | |
1654 | sizeof(void*))) { | |
1655 | spin_unlock_bh(&session->lock); | |
1656 | goto login_mtask_alloc_fail; | |
1657 | } | |
1658 | spin_unlock_bh(&session->lock); | |
1659 | ||
bf32ed33 | 1660 | data = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL); |
d36ab6f3 MC |
1661 | if (!data) |
1662 | goto login_mtask_data_alloc_fail; | |
c8dc1e52 | 1663 | conn->login_mtask->data = conn->data = data; |
d36ab6f3 | 1664 | |
843c0a8a | 1665 | init_timer(&conn->tmf_timer); |
7996a778 MC |
1666 | init_waitqueue_head(&conn->ehwait); |
1667 | ||
1668 | return cls_conn; | |
1669 | ||
d36ab6f3 MC |
1670 | login_mtask_data_alloc_fail: |
1671 | __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask, | |
1672 | sizeof(void*)); | |
7996a778 | 1673 | login_mtask_alloc_fail: |
7996a778 MC |
1674 | iscsi_destroy_conn(cls_conn); |
1675 | return NULL; | |
1676 | } | |
1677 | EXPORT_SYMBOL_GPL(iscsi_conn_setup); | |
1678 | ||
1679 | /** | |
1680 | * iscsi_conn_teardown - teardown iscsi connection | |
1681 | * cls_conn: iscsi class connection | |
1682 | * | |
1683 | * TODO: we may need to make this into a two step process | |
1684 | * like scsi-mls remove + put host | |
1685 | */ | |
1686 | void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) | |
1687 | { | |
1688 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1689 | struct iscsi_session *session = conn->session; | |
1690 | unsigned long flags; | |
1691 | ||
7996a778 MC |
1692 | spin_lock_bh(&session->lock); |
1693 | conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; | |
1694 | if (session->leadconn == conn) { | |
1695 | /* | |
1696 | * leading connection? then give up on recovery. | |
1697 | */ | |
1698 | session->state = ISCSI_STATE_TERMINATE; | |
1699 | wake_up(&conn->ehwait); | |
1700 | } | |
1701 | spin_unlock_bh(&session->lock); | |
1702 | ||
7996a778 MC |
1703 | /* |
1704 | * Block until all in-progress commands for this connection | |
1705 | * time out or fail. | |
1706 | */ | |
1707 | for (;;) { | |
1708 | spin_lock_irqsave(session->host->host_lock, flags); | |
1709 | if (!session->host->host_busy) { /* OK for ERL == 0 */ | |
1710 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
1711 | break; | |
1712 | } | |
1713 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
1714 | msleep_interruptible(500); | |
be2df72e OG |
1715 | printk(KERN_INFO "iscsi: scsi conn_destroy(): host_busy %d " |
1716 | "host_failed %d\n", session->host->host_busy, | |
1717 | session->host->host_failed); | |
7996a778 MC |
1718 | /* |
1719 | * force eh_abort() to unblock | |
1720 | */ | |
1721 | wake_up(&conn->ehwait); | |
1722 | } | |
1723 | ||
779ea120 | 1724 | /* flush queued up work because we free the connection below */ |
843c0a8a | 1725 | iscsi_suspend_tx(conn); |
779ea120 | 1726 | |
7996a778 | 1727 | spin_lock_bh(&session->lock); |
c8dc1e52 | 1728 | kfree(conn->data); |
f3ff0c36 | 1729 | kfree(conn->persistent_address); |
7996a778 MC |
1730 | __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask, |
1731 | sizeof(void*)); | |
e0726407 | 1732 | if (session->leadconn == conn) |
7996a778 | 1733 | session->leadconn = NULL; |
7996a778 MC |
1734 | spin_unlock_bh(&session->lock); |
1735 | ||
7996a778 MC |
1736 | iscsi_destroy_conn(cls_conn); |
1737 | } | |
1738 | EXPORT_SYMBOL_GPL(iscsi_conn_teardown); | |
1739 | ||
1740 | int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) | |
1741 | { | |
1742 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1743 | struct iscsi_session *session = conn->session; | |
1744 | ||
ffd0436e | 1745 | if (!session) { |
7996a778 MC |
1746 | printk(KERN_ERR "iscsi: can't start unbound connection\n"); |
1747 | return -EPERM; | |
1748 | } | |
1749 | ||
db98ccde MC |
1750 | if ((session->imm_data_en || !session->initial_r2t_en) && |
1751 | session->first_burst > session->max_burst) { | |
ffd0436e MC |
1752 | printk("iscsi: invalid burst lengths: " |
1753 | "first_burst %d max_burst %d\n", | |
1754 | session->first_burst, session->max_burst); | |
1755 | return -EINVAL; | |
1756 | } | |
1757 | ||
7996a778 MC |
1758 | spin_lock_bh(&session->lock); |
1759 | conn->c_stage = ISCSI_CONN_STARTED; | |
1760 | session->state = ISCSI_STATE_LOGGED_IN; | |
e0726407 | 1761 | session->queued_cmdsn = session->cmdsn; |
7996a778 MC |
1762 | |
1763 | switch(conn->stop_stage) { | |
1764 | case STOP_CONN_RECOVER: | |
1765 | /* | |
1766 | * unblock eh_abort() if it is blocked. re-try all | |
1767 | * commands after successful recovery | |
1768 | */ | |
7996a778 | 1769 | conn->stop_stage = 0; |
843c0a8a | 1770 | conn->tmf_state = TMF_INITIAL; |
7996a778 | 1771 | session->age++; |
7996a778 MC |
1772 | spin_unlock_bh(&session->lock); |
1773 | ||
1774 | iscsi_unblock_session(session_to_cls(session)); | |
1775 | wake_up(&conn->ehwait); | |
1776 | return 0; | |
1777 | case STOP_CONN_TERM: | |
7996a778 | 1778 | conn->stop_stage = 0; |
7996a778 MC |
1779 | break; |
1780 | default: | |
1781 | break; | |
1782 | } | |
1783 | spin_unlock_bh(&session->lock); | |
1784 | ||
1785 | return 0; | |
1786 | } | |
1787 | EXPORT_SYMBOL_GPL(iscsi_conn_start); | |
1788 | ||
1789 | static void | |
1790 | flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn) | |
1791 | { | |
1792 | struct iscsi_mgmt_task *mtask, *tmp; | |
1793 | ||
1794 | /* handle pending */ | |
843c0a8a MC |
1795 | list_for_each_entry_safe(mtask, tmp, &conn->mgmtqueue, running) { |
1796 | debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt); | |
1797 | list_del_init(&mtask->running); | |
7996a778 MC |
1798 | if (mtask == conn->login_mtask) |
1799 | continue; | |
7996a778 MC |
1800 | __kfifo_put(session->mgmtpool.queue, (void*)&mtask, |
1801 | sizeof(void*)); | |
1802 | } | |
1803 | ||
1804 | /* handle running */ | |
1805 | list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) { | |
1806 | debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt); | |
843c0a8a | 1807 | list_del_init(&mtask->running); |
ed2abc7f | 1808 | |
7996a778 MC |
1809 | if (mtask == conn->login_mtask) |
1810 | continue; | |
ed2abc7f | 1811 | __kfifo_put(session->mgmtpool.queue, (void*)&mtask, |
7996a778 MC |
1812 | sizeof(void*)); |
1813 | } | |
1814 | ||
1815 | conn->mtask = NULL; | |
1816 | } | |
1817 | ||
656cffc9 MC |
1818 | static void iscsi_start_session_recovery(struct iscsi_session *session, |
1819 | struct iscsi_conn *conn, int flag) | |
7996a778 | 1820 | { |
ed2abc7f MC |
1821 | int old_stop_stage; |
1822 | ||
6724add1 | 1823 | mutex_lock(&session->eh_mutex); |
7996a778 | 1824 | spin_lock_bh(&session->lock); |
ed2abc7f | 1825 | if (conn->stop_stage == STOP_CONN_TERM) { |
7996a778 | 1826 | spin_unlock_bh(&session->lock); |
6724add1 MC |
1827 | mutex_unlock(&session->eh_mutex); |
1828 | return; | |
1829 | } | |
1830 | ||
1831 | /* | |
1832 | * The LLD either freed/unset the lock on us, or userspace called | |
1833 | * stop but did not create a proper connection (connection was never | |
1834 | * bound or it was unbound then stop was called). | |
1835 | */ | |
1836 | if (!conn->recv_lock) { | |
1837 | spin_unlock_bh(&session->lock); | |
1838 | mutex_unlock(&session->eh_mutex); | |
7996a778 MC |
1839 | return; |
1840 | } | |
ed2abc7f MC |
1841 | |
1842 | /* | |
1843 | * When this is called for the in_login state, we only want to clean | |
67a61114 MC |
1844 | * up the login task and connection. We do not need to block and set |
1845 | * the recovery state again | |
ed2abc7f | 1846 | */ |
67a61114 MC |
1847 | if (flag == STOP_CONN_TERM) |
1848 | session->state = ISCSI_STATE_TERMINATE; | |
1849 | else if (conn->stop_stage != STOP_CONN_RECOVER) | |
1850 | session->state = ISCSI_STATE_IN_RECOVERY; | |
ed2abc7f MC |
1851 | |
1852 | old_stop_stage = conn->stop_stage; | |
7996a778 | 1853 | conn->stop_stage = flag; |
67a61114 | 1854 | conn->c_stage = ISCSI_CONN_STOPPED; |
7996a778 | 1855 | spin_unlock_bh(&session->lock); |
6724add1 MC |
1856 | |
1857 | iscsi_suspend_tx(conn); | |
7996a778 | 1858 | |
1c83469d MC |
1859 | write_lock_bh(conn->recv_lock); |
1860 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
1861 | write_unlock_bh(conn->recv_lock); | |
7996a778 | 1862 | |
7996a778 MC |
1863 | /* |
1864 | * for connection level recovery we should not calculate | |
1865 | * header digest. conn->hdr_size used for optimization | |
1866 | * in hdr_extract() and will be re-negotiated at | |
1867 | * set_param() time. | |
1868 | */ | |
1869 | if (flag == STOP_CONN_RECOVER) { | |
1870 | conn->hdrdgst_en = 0; | |
1871 | conn->datadgst_en = 0; | |
656cffc9 | 1872 | if (session->state == ISCSI_STATE_IN_RECOVERY && |
67a61114 MC |
1873 | old_stop_stage != STOP_CONN_RECOVER) { |
1874 | debug_scsi("blocking session\n"); | |
7996a778 | 1875 | iscsi_block_session(session_to_cls(session)); |
67a61114 | 1876 | } |
7996a778 | 1877 | } |
656cffc9 | 1878 | |
656cffc9 MC |
1879 | /* |
1880 | * flush queues. | |
1881 | */ | |
1882 | spin_lock_bh(&session->lock); | |
843c0a8a | 1883 | fail_all_commands(conn, -1); |
656cffc9 MC |
1884 | flush_control_queues(session, conn); |
1885 | spin_unlock_bh(&session->lock); | |
6724add1 | 1886 | mutex_unlock(&session->eh_mutex); |
7996a778 | 1887 | } |
7996a778 MC |
1888 | |
1889 | void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
1890 | { | |
1891 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1892 | struct iscsi_session *session = conn->session; | |
1893 | ||
1894 | switch (flag) { | |
1895 | case STOP_CONN_RECOVER: | |
1896 | case STOP_CONN_TERM: | |
1897 | iscsi_start_session_recovery(session, conn, flag); | |
8d2860b3 | 1898 | break; |
7996a778 | 1899 | default: |
be2df72e | 1900 | printk(KERN_ERR "iscsi: invalid stop flag %d\n", flag); |
7996a778 MC |
1901 | } |
1902 | } | |
1903 | EXPORT_SYMBOL_GPL(iscsi_conn_stop); | |
1904 | ||
1905 | int iscsi_conn_bind(struct iscsi_cls_session *cls_session, | |
1906 | struct iscsi_cls_conn *cls_conn, int is_leading) | |
1907 | { | |
1908 | struct iscsi_session *session = class_to_transport_session(cls_session); | |
98644047 | 1909 | struct iscsi_conn *conn = cls_conn->dd_data; |
7996a778 | 1910 | |
7996a778 | 1911 | spin_lock_bh(&session->lock); |
7996a778 MC |
1912 | if (is_leading) |
1913 | session->leadconn = conn; | |
98644047 | 1914 | spin_unlock_bh(&session->lock); |
7996a778 MC |
1915 | |
1916 | /* | |
1917 | * Unblock xmitworker(), Login Phase will pass through. | |
1918 | */ | |
1919 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
1920 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
1921 | return 0; | |
1922 | } | |
1923 | EXPORT_SYMBOL_GPL(iscsi_conn_bind); | |
1924 | ||
a54a52ca MC |
1925 | |
1926 | int iscsi_set_param(struct iscsi_cls_conn *cls_conn, | |
1927 | enum iscsi_param param, char *buf, int buflen) | |
1928 | { | |
1929 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1930 | struct iscsi_session *session = conn->session; | |
1931 | uint32_t value; | |
1932 | ||
1933 | switch(param) { | |
843c0a8a MC |
1934 | case ISCSI_PARAM_FAST_ABORT: |
1935 | sscanf(buf, "%d", &session->fast_abort); | |
1936 | break; | |
a54a52ca MC |
1937 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
1938 | sscanf(buf, "%d", &conn->max_recv_dlength); | |
1939 | break; | |
1940 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
1941 | sscanf(buf, "%d", &conn->max_xmit_dlength); | |
1942 | break; | |
1943 | case ISCSI_PARAM_HDRDGST_EN: | |
1944 | sscanf(buf, "%d", &conn->hdrdgst_en); | |
1945 | break; | |
1946 | case ISCSI_PARAM_DATADGST_EN: | |
1947 | sscanf(buf, "%d", &conn->datadgst_en); | |
1948 | break; | |
1949 | case ISCSI_PARAM_INITIAL_R2T_EN: | |
1950 | sscanf(buf, "%d", &session->initial_r2t_en); | |
1951 | break; | |
1952 | case ISCSI_PARAM_MAX_R2T: | |
1953 | sscanf(buf, "%d", &session->max_r2t); | |
1954 | break; | |
1955 | case ISCSI_PARAM_IMM_DATA_EN: | |
1956 | sscanf(buf, "%d", &session->imm_data_en); | |
1957 | break; | |
1958 | case ISCSI_PARAM_FIRST_BURST: | |
1959 | sscanf(buf, "%d", &session->first_burst); | |
1960 | break; | |
1961 | case ISCSI_PARAM_MAX_BURST: | |
1962 | sscanf(buf, "%d", &session->max_burst); | |
1963 | break; | |
1964 | case ISCSI_PARAM_PDU_INORDER_EN: | |
1965 | sscanf(buf, "%d", &session->pdu_inorder_en); | |
1966 | break; | |
1967 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
1968 | sscanf(buf, "%d", &session->dataseq_inorder_en); | |
1969 | break; | |
1970 | case ISCSI_PARAM_ERL: | |
1971 | sscanf(buf, "%d", &session->erl); | |
1972 | break; | |
1973 | case ISCSI_PARAM_IFMARKER_EN: | |
1974 | sscanf(buf, "%d", &value); | |
1975 | BUG_ON(value); | |
1976 | break; | |
1977 | case ISCSI_PARAM_OFMARKER_EN: | |
1978 | sscanf(buf, "%d", &value); | |
1979 | BUG_ON(value); | |
1980 | break; | |
1981 | case ISCSI_PARAM_EXP_STATSN: | |
1982 | sscanf(buf, "%u", &conn->exp_statsn); | |
1983 | break; | |
b2c64167 MC |
1984 | case ISCSI_PARAM_USERNAME: |
1985 | kfree(session->username); | |
1986 | session->username = kstrdup(buf, GFP_KERNEL); | |
1987 | if (!session->username) | |
1988 | return -ENOMEM; | |
1989 | break; | |
1990 | case ISCSI_PARAM_USERNAME_IN: | |
1991 | kfree(session->username_in); | |
1992 | session->username_in = kstrdup(buf, GFP_KERNEL); | |
1993 | if (!session->username_in) | |
1994 | return -ENOMEM; | |
1995 | break; | |
1996 | case ISCSI_PARAM_PASSWORD: | |
1997 | kfree(session->password); | |
1998 | session->password = kstrdup(buf, GFP_KERNEL); | |
1999 | if (!session->password) | |
2000 | return -ENOMEM; | |
2001 | break; | |
2002 | case ISCSI_PARAM_PASSWORD_IN: | |
2003 | kfree(session->password_in); | |
2004 | session->password_in = kstrdup(buf, GFP_KERNEL); | |
2005 | if (!session->password_in) | |
2006 | return -ENOMEM; | |
2007 | break; | |
a54a52ca MC |
2008 | case ISCSI_PARAM_TARGET_NAME: |
2009 | /* this should not change between logins */ | |
2010 | if (session->targetname) | |
2011 | break; | |
2012 | ||
2013 | session->targetname = kstrdup(buf, GFP_KERNEL); | |
2014 | if (!session->targetname) | |
2015 | return -ENOMEM; | |
2016 | break; | |
2017 | case ISCSI_PARAM_TPGT: | |
2018 | sscanf(buf, "%d", &session->tpgt); | |
2019 | break; | |
2020 | case ISCSI_PARAM_PERSISTENT_PORT: | |
2021 | sscanf(buf, "%d", &conn->persistent_port); | |
2022 | break; | |
2023 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
2024 | /* | |
2025 | * this is the address returned in discovery so it should | |
2026 | * not change between logins. | |
2027 | */ | |
2028 | if (conn->persistent_address) | |
2029 | break; | |
2030 | ||
2031 | conn->persistent_address = kstrdup(buf, GFP_KERNEL); | |
2032 | if (!conn->persistent_address) | |
2033 | return -ENOMEM; | |
2034 | break; | |
2035 | default: | |
2036 | return -ENOSYS; | |
2037 | } | |
2038 | ||
2039 | return 0; | |
2040 | } | |
2041 | EXPORT_SYMBOL_GPL(iscsi_set_param); | |
2042 | ||
2043 | int iscsi_session_get_param(struct iscsi_cls_session *cls_session, | |
2044 | enum iscsi_param param, char *buf) | |
2045 | { | |
2046 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); | |
2047 | struct iscsi_session *session = iscsi_hostdata(shost->hostdata); | |
2048 | int len; | |
2049 | ||
2050 | switch(param) { | |
843c0a8a MC |
2051 | case ISCSI_PARAM_FAST_ABORT: |
2052 | len = sprintf(buf, "%d\n", session->fast_abort); | |
2053 | break; | |
a54a52ca MC |
2054 | case ISCSI_PARAM_INITIAL_R2T_EN: |
2055 | len = sprintf(buf, "%d\n", session->initial_r2t_en); | |
2056 | break; | |
2057 | case ISCSI_PARAM_MAX_R2T: | |
2058 | len = sprintf(buf, "%hu\n", session->max_r2t); | |
2059 | break; | |
2060 | case ISCSI_PARAM_IMM_DATA_EN: | |
2061 | len = sprintf(buf, "%d\n", session->imm_data_en); | |
2062 | break; | |
2063 | case ISCSI_PARAM_FIRST_BURST: | |
2064 | len = sprintf(buf, "%u\n", session->first_burst); | |
2065 | break; | |
2066 | case ISCSI_PARAM_MAX_BURST: | |
2067 | len = sprintf(buf, "%u\n", session->max_burst); | |
2068 | break; | |
2069 | case ISCSI_PARAM_PDU_INORDER_EN: | |
2070 | len = sprintf(buf, "%d\n", session->pdu_inorder_en); | |
2071 | break; | |
2072 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
2073 | len = sprintf(buf, "%d\n", session->dataseq_inorder_en); | |
2074 | break; | |
2075 | case ISCSI_PARAM_ERL: | |
2076 | len = sprintf(buf, "%d\n", session->erl); | |
2077 | break; | |
2078 | case ISCSI_PARAM_TARGET_NAME: | |
2079 | len = sprintf(buf, "%s\n", session->targetname); | |
2080 | break; | |
2081 | case ISCSI_PARAM_TPGT: | |
2082 | len = sprintf(buf, "%d\n", session->tpgt); | |
2083 | break; | |
b2c64167 MC |
2084 | case ISCSI_PARAM_USERNAME: |
2085 | len = sprintf(buf, "%s\n", session->username); | |
2086 | break; | |
2087 | case ISCSI_PARAM_USERNAME_IN: | |
2088 | len = sprintf(buf, "%s\n", session->username_in); | |
2089 | break; | |
2090 | case ISCSI_PARAM_PASSWORD: | |
2091 | len = sprintf(buf, "%s\n", session->password); | |
2092 | break; | |
2093 | case ISCSI_PARAM_PASSWORD_IN: | |
2094 | len = sprintf(buf, "%s\n", session->password_in); | |
2095 | break; | |
a54a52ca MC |
2096 | default: |
2097 | return -ENOSYS; | |
2098 | } | |
2099 | ||
2100 | return len; | |
2101 | } | |
2102 | EXPORT_SYMBOL_GPL(iscsi_session_get_param); | |
2103 | ||
2104 | int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, | |
2105 | enum iscsi_param param, char *buf) | |
2106 | { | |
2107 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2108 | int len; | |
2109 | ||
2110 | switch(param) { | |
2111 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
2112 | len = sprintf(buf, "%u\n", conn->max_recv_dlength); | |
2113 | break; | |
2114 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
2115 | len = sprintf(buf, "%u\n", conn->max_xmit_dlength); | |
2116 | break; | |
2117 | case ISCSI_PARAM_HDRDGST_EN: | |
2118 | len = sprintf(buf, "%d\n", conn->hdrdgst_en); | |
2119 | break; | |
2120 | case ISCSI_PARAM_DATADGST_EN: | |
2121 | len = sprintf(buf, "%d\n", conn->datadgst_en); | |
2122 | break; | |
2123 | case ISCSI_PARAM_IFMARKER_EN: | |
2124 | len = sprintf(buf, "%d\n", conn->ifmarker_en); | |
2125 | break; | |
2126 | case ISCSI_PARAM_OFMARKER_EN: | |
2127 | len = sprintf(buf, "%d\n", conn->ofmarker_en); | |
2128 | break; | |
2129 | case ISCSI_PARAM_EXP_STATSN: | |
2130 | len = sprintf(buf, "%u\n", conn->exp_statsn); | |
2131 | break; | |
2132 | case ISCSI_PARAM_PERSISTENT_PORT: | |
2133 | len = sprintf(buf, "%d\n", conn->persistent_port); | |
2134 | break; | |
2135 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
2136 | len = sprintf(buf, "%s\n", conn->persistent_address); | |
2137 | break; | |
2138 | default: | |
2139 | return -ENOSYS; | |
2140 | } | |
2141 | ||
2142 | return len; | |
2143 | } | |
2144 | EXPORT_SYMBOL_GPL(iscsi_conn_get_param); | |
2145 | ||
0801c242 MC |
2146 | int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param, |
2147 | char *buf) | |
2148 | { | |
2149 | struct iscsi_session *session = iscsi_hostdata(shost->hostdata); | |
2150 | int len; | |
2151 | ||
2152 | switch (param) { | |
d8196ed2 MC |
2153 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
2154 | if (!session->netdev) | |
2155 | len = sprintf(buf, "%s\n", "default"); | |
2156 | else | |
2157 | len = sprintf(buf, "%s\n", session->netdev); | |
2158 | break; | |
0801c242 MC |
2159 | case ISCSI_HOST_PARAM_HWADDRESS: |
2160 | if (!session->hwaddress) | |
2161 | len = sprintf(buf, "%s\n", "default"); | |
2162 | else | |
2163 | len = sprintf(buf, "%s\n", session->hwaddress); | |
2164 | break; | |
8ad5781a MC |
2165 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
2166 | if (!session->initiatorname) | |
2167 | len = sprintf(buf, "%s\n", "unknown"); | |
2168 | else | |
2169 | len = sprintf(buf, "%s\n", session->initiatorname); | |
2170 | break; | |
2171 | ||
0801c242 MC |
2172 | default: |
2173 | return -ENOSYS; | |
2174 | } | |
2175 | ||
2176 | return len; | |
2177 | } | |
2178 | EXPORT_SYMBOL_GPL(iscsi_host_get_param); | |
2179 | ||
2180 | int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param, | |
2181 | char *buf, int buflen) | |
2182 | { | |
2183 | struct iscsi_session *session = iscsi_hostdata(shost->hostdata); | |
2184 | ||
2185 | switch (param) { | |
d8196ed2 MC |
2186 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
2187 | if (!session->netdev) | |
2188 | session->netdev = kstrdup(buf, GFP_KERNEL); | |
2189 | break; | |
0801c242 MC |
2190 | case ISCSI_HOST_PARAM_HWADDRESS: |
2191 | if (!session->hwaddress) | |
2192 | session->hwaddress = kstrdup(buf, GFP_KERNEL); | |
2193 | break; | |
8ad5781a MC |
2194 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
2195 | if (!session->initiatorname) | |
2196 | session->initiatorname = kstrdup(buf, GFP_KERNEL); | |
2197 | break; | |
0801c242 MC |
2198 | default: |
2199 | return -ENOSYS; | |
2200 | } | |
2201 | ||
2202 | return 0; | |
2203 | } | |
2204 | EXPORT_SYMBOL_GPL(iscsi_host_set_param); | |
2205 | ||
7996a778 MC |
2206 | MODULE_AUTHOR("Mike Christie"); |
2207 | MODULE_DESCRIPTION("iSCSI library functions"); | |
2208 | MODULE_LICENSE("GPL"); |