Commit | Line | Data |
---|---|---|
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) || | |
89 | __kfifo_len(session->leadconn->mgmtqueue)) | |
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 | ||
294 | if (sc->sc_data_direction == DMA_TO_DEVICE) | |
295 | goto out; | |
296 | ||
297 | if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) { | |
298 | int res_count = be32_to_cpu(rhdr->residual_count); | |
299 | ||
1c138991 FT |
300 | if (res_count > 0 && res_count <= scsi_bufflen(sc)) |
301 | scsi_set_resid(sc, res_count); | |
7996a778 MC |
302 | else |
303 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
304 | } else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW) | |
305 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
306 | else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW) | |
1c138991 | 307 | scsi_set_resid(sc, be32_to_cpu(rhdr->residual_count)); |
7996a778 MC |
308 | |
309 | out: | |
310 | debug_scsi("done [sc %lx res %d itt 0x%x]\n", | |
311 | (long)sc, sc->result, ctask->itt); | |
312 | conn->scsirsp_pdus_cnt++; | |
313 | ||
60ecebf5 | 314 | __iscsi_put_ctask(ctask); |
7996a778 MC |
315 | } |
316 | ||
7ea8b828 MC |
317 | static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) |
318 | { | |
319 | struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr; | |
320 | ||
321 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
322 | conn->tmfrsp_pdus_cnt++; | |
323 | ||
324 | if (conn->tmabort_state != TMABORT_INITIAL) | |
325 | return; | |
326 | ||
327 | if (tmf->response == ISCSI_TMF_RSP_COMPLETE) | |
328 | conn->tmabort_state = TMABORT_SUCCESS; | |
329 | else if (tmf->response == ISCSI_TMF_RSP_NO_TASK) | |
330 | conn->tmabort_state = TMABORT_NOT_FOUND; | |
331 | else | |
332 | conn->tmabort_state = TMABORT_FAILED; | |
333 | wake_up(&conn->ehwait); | |
334 | } | |
335 | ||
62f38300 MC |
336 | static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
337 | char *data, int datalen) | |
338 | { | |
339 | struct iscsi_reject *reject = (struct iscsi_reject *)hdr; | |
340 | struct iscsi_hdr rejected_pdu; | |
341 | uint32_t itt; | |
342 | ||
343 | conn->exp_statsn = be32_to_cpu(reject->statsn) + 1; | |
344 | ||
345 | if (reject->reason == ISCSI_REASON_DATA_DIGEST_ERROR) { | |
346 | if (ntoh24(reject->dlength) > datalen) | |
347 | return ISCSI_ERR_PROTO; | |
348 | ||
349 | if (ntoh24(reject->dlength) >= sizeof(struct iscsi_hdr)) { | |
350 | memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr)); | |
b4377356 | 351 | itt = get_itt(rejected_pdu.itt); |
62f38300 MC |
352 | printk(KERN_ERR "itt 0x%x had pdu (op 0x%x) rejected " |
353 | "due to DataDigest error.\n", itt, | |
354 | rejected_pdu.opcode); | |
355 | } | |
356 | } | |
357 | return 0; | |
358 | } | |
359 | ||
7996a778 MC |
360 | /** |
361 | * __iscsi_complete_pdu - complete pdu | |
362 | * @conn: iscsi conn | |
363 | * @hdr: iscsi header | |
364 | * @data: data buffer | |
365 | * @datalen: len of data buffer | |
366 | * | |
367 | * Completes pdu processing by freeing any resources allocated at | |
368 | * queuecommand or send generic. session lock must be held and verify | |
369 | * itt must have been called. | |
370 | */ | |
371 | int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
372 | char *data, int datalen) | |
373 | { | |
374 | struct iscsi_session *session = conn->session; | |
375 | int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0; | |
376 | struct iscsi_cmd_task *ctask; | |
377 | struct iscsi_mgmt_task *mtask; | |
378 | uint32_t itt; | |
379 | ||
b4377356 AV |
380 | if (hdr->itt != RESERVED_ITT) |
381 | itt = get_itt(hdr->itt); | |
7996a778 | 382 | else |
b4377356 | 383 | itt = ~0U; |
7996a778 MC |
384 | |
385 | if (itt < session->cmds_max) { | |
386 | ctask = session->cmds[itt]; | |
387 | ||
388 | debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n", | |
389 | opcode, conn->id, ctask->itt, datalen); | |
390 | ||
391 | switch(opcode) { | |
392 | case ISCSI_OP_SCSI_CMD_RSP: | |
393 | BUG_ON((void*)ctask != ctask->sc->SCp.ptr); | |
77a23c21 MC |
394 | iscsi_scsi_cmd_rsp(conn, hdr, ctask, data, |
395 | datalen); | |
7996a778 MC |
396 | break; |
397 | case ISCSI_OP_SCSI_DATA_IN: | |
398 | BUG_ON((void*)ctask != ctask->sc->SCp.ptr); | |
399 | if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { | |
400 | conn->scsirsp_pdus_cnt++; | |
60ecebf5 | 401 | __iscsi_put_ctask(ctask); |
7996a778 MC |
402 | } |
403 | break; | |
404 | case ISCSI_OP_R2T: | |
405 | /* LLD handles this for now */ | |
406 | break; | |
407 | default: | |
408 | rc = ISCSI_ERR_BAD_OPCODE; | |
409 | break; | |
410 | } | |
411 | } else if (itt >= ISCSI_MGMT_ITT_OFFSET && | |
412 | itt < ISCSI_MGMT_ITT_OFFSET + session->mgmtpool_max) { | |
413 | mtask = session->mgmt_cmds[itt - ISCSI_MGMT_ITT_OFFSET]; | |
414 | ||
415 | debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n", | |
416 | opcode, conn->id, mtask->itt, datalen); | |
417 | ||
77a23c21 | 418 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); |
7996a778 | 419 | switch(opcode) { |
8d2860b3 | 420 | case ISCSI_OP_LOGOUT_RSP: |
c8dc1e52 MC |
421 | if (datalen) { |
422 | rc = ISCSI_ERR_PROTO; | |
423 | break; | |
424 | } | |
8d2860b3 MC |
425 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
426 | /* fall through */ | |
7996a778 MC |
427 | case ISCSI_OP_LOGIN_RSP: |
428 | case ISCSI_OP_TEXT_RSP: | |
8d2860b3 MC |
429 | /* |
430 | * login related PDU's exp_statsn is handled in | |
431 | * userspace | |
432 | */ | |
40527afe MC |
433 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) |
434 | rc = ISCSI_ERR_CONN_FAILED; | |
7996a778 MC |
435 | list_del(&mtask->running); |
436 | if (conn->login_mtask != mtask) | |
437 | __kfifo_put(session->mgmtpool.queue, | |
438 | (void*)&mtask, sizeof(void*)); | |
439 | break; | |
440 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
7996a778 MC |
441 | if (datalen) { |
442 | rc = ISCSI_ERR_PROTO; | |
443 | break; | |
444 | } | |
8d2860b3 | 445 | |
7ea8b828 | 446 | iscsi_tmf_rsp(conn, hdr); |
7996a778 MC |
447 | break; |
448 | case ISCSI_OP_NOOP_IN: | |
b4377356 | 449 | if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) { |
7996a778 MC |
450 | rc = ISCSI_ERR_PROTO; |
451 | break; | |
452 | } | |
7996a778 MC |
453 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
454 | ||
40527afe MC |
455 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) |
456 | rc = ISCSI_ERR_CONN_FAILED; | |
7996a778 MC |
457 | list_del(&mtask->running); |
458 | if (conn->login_mtask != mtask) | |
459 | __kfifo_put(session->mgmtpool.queue, | |
460 | (void*)&mtask, sizeof(void*)); | |
461 | break; | |
462 | default: | |
463 | rc = ISCSI_ERR_BAD_OPCODE; | |
464 | break; | |
465 | } | |
b4377356 | 466 | } else if (itt == ~0U) { |
77a23c21 | 467 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); |
62f38300 | 468 | |
7996a778 MC |
469 | switch(opcode) { |
470 | case ISCSI_OP_NOOP_IN: | |
40527afe | 471 | if (datalen) { |
7996a778 | 472 | rc = ISCSI_ERR_PROTO; |
40527afe MC |
473 | break; |
474 | } | |
475 | ||
b4377356 | 476 | if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG)) |
40527afe MC |
477 | break; |
478 | ||
479 | if (iscsi_recv_pdu(conn->cls_conn, hdr, NULL, 0)) | |
480 | rc = ISCSI_ERR_CONN_FAILED; | |
7996a778 MC |
481 | break; |
482 | case ISCSI_OP_REJECT: | |
62f38300 MC |
483 | rc = iscsi_handle_reject(conn, hdr, data, datalen); |
484 | break; | |
7996a778 | 485 | case ISCSI_OP_ASYNC_EVENT: |
8d2860b3 | 486 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
5831c737 MC |
487 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) |
488 | rc = ISCSI_ERR_CONN_FAILED; | |
7996a778 MC |
489 | break; |
490 | default: | |
491 | rc = ISCSI_ERR_BAD_OPCODE; | |
492 | break; | |
493 | } | |
494 | } else | |
495 | rc = ISCSI_ERR_BAD_ITT; | |
496 | ||
497 | return rc; | |
498 | } | |
499 | EXPORT_SYMBOL_GPL(__iscsi_complete_pdu); | |
500 | ||
501 | int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
502 | char *data, int datalen) | |
503 | { | |
504 | int rc; | |
505 | ||
506 | spin_lock(&conn->session->lock); | |
507 | rc = __iscsi_complete_pdu(conn, hdr, data, datalen); | |
508 | spin_unlock(&conn->session->lock); | |
509 | return rc; | |
510 | } | |
511 | EXPORT_SYMBOL_GPL(iscsi_complete_pdu); | |
512 | ||
513 | /* verify itt (itt encoding: age+cid+itt) */ | |
514 | int iscsi_verify_itt(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
515 | uint32_t *ret_itt) | |
516 | { | |
517 | struct iscsi_session *session = conn->session; | |
518 | struct iscsi_cmd_task *ctask; | |
519 | uint32_t itt; | |
520 | ||
b4377356 AV |
521 | if (hdr->itt != RESERVED_ITT) { |
522 | if (((__force u32)hdr->itt & ISCSI_AGE_MASK) != | |
7996a778 | 523 | (session->age << ISCSI_AGE_SHIFT)) { |
be2df72e | 524 | printk(KERN_ERR "iscsi: received itt %x expected " |
b4377356 | 525 | "session age (%x)\n", (__force u32)hdr->itt, |
7996a778 MC |
526 | session->age & ISCSI_AGE_MASK); |
527 | return ISCSI_ERR_BAD_ITT; | |
528 | } | |
529 | ||
b4377356 | 530 | if (((__force u32)hdr->itt & ISCSI_CID_MASK) != |
7996a778 | 531 | (conn->id << ISCSI_CID_SHIFT)) { |
be2df72e | 532 | printk(KERN_ERR "iscsi: received itt %x, expected " |
b4377356 | 533 | "CID (%x)\n", (__force u32)hdr->itt, conn->id); |
7996a778 MC |
534 | return ISCSI_ERR_BAD_ITT; |
535 | } | |
b4377356 | 536 | itt = get_itt(hdr->itt); |
7996a778 | 537 | } else |
b4377356 | 538 | itt = ~0U; |
7996a778 MC |
539 | |
540 | if (itt < session->cmds_max) { | |
541 | ctask = session->cmds[itt]; | |
542 | ||
543 | if (!ctask->sc) { | |
be2df72e | 544 | printk(KERN_INFO "iscsi: dropping ctask with " |
7996a778 MC |
545 | "itt 0x%x\n", ctask->itt); |
546 | /* force drop */ | |
547 | return ISCSI_ERR_NO_SCSI_CMD; | |
548 | } | |
549 | ||
550 | if (ctask->sc->SCp.phase != session->age) { | |
be2df72e | 551 | printk(KERN_ERR "iscsi: ctask's session age %d, " |
7996a778 MC |
552 | "expected %d\n", ctask->sc->SCp.phase, |
553 | session->age); | |
554 | return ISCSI_ERR_SESSION_FAILED; | |
555 | } | |
556 | } | |
557 | ||
558 | *ret_itt = itt; | |
559 | return 0; | |
560 | } | |
561 | EXPORT_SYMBOL_GPL(iscsi_verify_itt); | |
562 | ||
563 | void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) | |
564 | { | |
565 | struct iscsi_session *session = conn->session; | |
566 | unsigned long flags; | |
567 | ||
568 | spin_lock_irqsave(&session->lock, flags); | |
656cffc9 MC |
569 | if (session->state == ISCSI_STATE_FAILED) { |
570 | spin_unlock_irqrestore(&session->lock, flags); | |
571 | return; | |
572 | } | |
573 | ||
67a61114 | 574 | if (conn->stop_stage == 0) |
7996a778 MC |
575 | session->state = ISCSI_STATE_FAILED; |
576 | spin_unlock_irqrestore(&session->lock, flags); | |
577 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
578 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
579 | iscsi_conn_error(conn->cls_conn, err); | |
580 | } | |
581 | EXPORT_SYMBOL_GPL(iscsi_conn_failure); | |
582 | ||
77a23c21 MC |
583 | static void iscsi_prep_mtask(struct iscsi_conn *conn, |
584 | struct iscsi_mgmt_task *mtask) | |
585 | { | |
586 | struct iscsi_session *session = conn->session; | |
587 | struct iscsi_hdr *hdr = mtask->hdr; | |
588 | struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; | |
589 | ||
590 | if (hdr->opcode != (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) && | |
591 | hdr->opcode != (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE)) | |
592 | nop->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
593 | /* | |
594 | * pre-format CmdSN for outgoing PDU. | |
595 | */ | |
596 | nop->cmdsn = cpu_to_be32(session->cmdsn); | |
597 | if (hdr->itt != RESERVED_ITT) { | |
598 | hdr->itt = build_itt(mtask->itt, conn->id, session->age); | |
599 | if (conn->c_stage == ISCSI_CONN_STARTED && | |
600 | !(hdr->opcode & ISCSI_OP_IMMEDIATE)) | |
601 | session->cmdsn++; | |
602 | } | |
603 | ||
604 | if (session->tt->init_mgmt_task) | |
605 | session->tt->init_mgmt_task(conn, mtask); | |
606 | ||
607 | debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n", | |
608 | hdr->opcode, hdr->itt, mtask->data_count); | |
609 | } | |
610 | ||
05db888a | 611 | static int iscsi_xmit_mtask(struct iscsi_conn *conn) |
b5072ea0 MC |
612 | { |
613 | struct iscsi_hdr *hdr = conn->mtask->hdr; | |
614 | int rc, was_logout = 0; | |
615 | ||
77a23c21 | 616 | spin_unlock_bh(&conn->session->lock); |
b5072ea0 MC |
617 | if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) { |
618 | conn->session->state = ISCSI_STATE_IN_RECOVERY; | |
619 | iscsi_block_session(session_to_cls(conn->session)); | |
620 | was_logout = 1; | |
621 | } | |
622 | rc = conn->session->tt->xmit_mgmt_task(conn, conn->mtask); | |
77a23c21 | 623 | spin_lock_bh(&conn->session->lock); |
b5072ea0 MC |
624 | if (rc) |
625 | return rc; | |
626 | ||
05db888a MC |
627 | /* done with this in-progress mtask */ |
628 | conn->mtask = NULL; | |
629 | ||
b5072ea0 MC |
630 | if (was_logout) { |
631 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
632 | return -ENODATA; | |
633 | } | |
634 | return 0; | |
635 | } | |
636 | ||
77a23c21 MC |
637 | static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn) |
638 | { | |
639 | struct iscsi_session *session = conn->session; | |
640 | ||
641 | /* | |
642 | * Check for iSCSI window and take care of CmdSN wrap-around | |
643 | */ | |
644 | if (!iscsi_sna_lte(session->cmdsn, session->max_cmdsn)) { | |
645 | debug_scsi("iSCSI CmdSN closed. MaxCmdSN %u CmdSN %u\n", | |
646 | session->max_cmdsn, session->cmdsn); | |
647 | return -ENOSPC; | |
648 | } | |
649 | return 0; | |
650 | } | |
651 | ||
652 | static int iscsi_xmit_ctask(struct iscsi_conn *conn) | |
653 | { | |
654 | struct iscsi_cmd_task *ctask = conn->ctask; | |
655 | int rc = 0; | |
656 | ||
657 | /* | |
658 | * serialize with TMF AbortTask | |
659 | */ | |
660 | if (ctask->state == ISCSI_TASK_ABORTING) | |
661 | goto done; | |
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); | |
668 | ||
669 | done: | |
670 | if (!rc) | |
671 | /* done with this ctask */ | |
672 | conn->ctask = NULL; | |
673 | return rc; | |
674 | } | |
675 | ||
7996a778 MC |
676 | /** |
677 | * iscsi_data_xmit - xmit any command into the scheduled connection | |
678 | * @conn: iscsi connection | |
679 | * | |
680 | * Notes: | |
681 | * The function can return -EAGAIN in which case the caller must | |
682 | * re-schedule it again later or recover. '0' return code means | |
683 | * successful xmit. | |
684 | **/ | |
685 | static int iscsi_data_xmit(struct iscsi_conn *conn) | |
686 | { | |
3219e529 | 687 | int rc = 0; |
7996a778 | 688 | |
77a23c21 | 689 | spin_lock_bh(&conn->session->lock); |
7996a778 MC |
690 | if (unlikely(conn->suspend_tx)) { |
691 | debug_scsi("conn %d Tx suspended!\n", conn->id); | |
77a23c21 | 692 | spin_unlock_bh(&conn->session->lock); |
3219e529 | 693 | return -ENODATA; |
7996a778 | 694 | } |
7996a778 MC |
695 | |
696 | if (conn->ctask) { | |
77a23c21 | 697 | rc = iscsi_xmit_ctask(conn); |
3219e529 | 698 | if (rc) |
7996a778 | 699 | goto again; |
7996a778 | 700 | } |
77a23c21 | 701 | |
7996a778 | 702 | if (conn->mtask) { |
05db888a | 703 | rc = iscsi_xmit_mtask(conn); |
3219e529 | 704 | if (rc) |
7996a778 | 705 | goto again; |
7996a778 MC |
706 | } |
707 | ||
77a23c21 MC |
708 | /* |
709 | * process mgmt pdus like nops before commands since we should | |
710 | * only have one nop-out as a ping from us and targets should not | |
711 | * overflow us with nop-ins | |
712 | */ | |
713 | check_mgmt: | |
714 | while (__kfifo_get(conn->mgmtqueue, (void*)&conn->mtask, | |
715 | sizeof(void*))) { | |
716 | iscsi_prep_mtask(conn, conn->mtask); | |
717 | list_add_tail(&conn->mtask->running, &conn->mgmt_run_list); | |
718 | rc = iscsi_xmit_mtask(conn); | |
719 | if (rc) | |
720 | goto again; | |
7996a778 MC |
721 | } |
722 | ||
723 | /* process command queue */ | |
b6c395ed | 724 | while (!list_empty(&conn->xmitqueue)) { |
77a23c21 MC |
725 | rc = iscsi_check_cmdsn_window_closed(conn); |
726 | if (rc) { | |
727 | spin_unlock_bh(&conn->session->lock); | |
728 | return rc; | |
729 | } | |
7996a778 MC |
730 | /* |
731 | * iscsi tcp may readd the task to the xmitqueue to send | |
732 | * write data | |
733 | */ | |
b6c395ed MC |
734 | conn->ctask = list_entry(conn->xmitqueue.next, |
735 | struct iscsi_cmd_task, running); | |
77a23c21 MC |
736 | if (conn->ctask->state == ISCSI_TASK_PENDING) { |
737 | iscsi_prep_scsi_cmd_pdu(conn->ctask); | |
738 | conn->session->tt->init_cmd_task(conn->ctask); | |
739 | } | |
b6c395ed MC |
740 | conn->ctask->state = ISCSI_TASK_RUNNING; |
741 | list_move_tail(conn->xmitqueue.next, &conn->run_list); | |
77a23c21 MC |
742 | rc = iscsi_xmit_ctask(conn); |
743 | if (rc) | |
60ecebf5 | 744 | goto again; |
77a23c21 MC |
745 | /* |
746 | * we could continuously get new ctask requests so | |
747 | * we need to check the mgmt queue for nops that need to | |
748 | * be sent to aviod starvation | |
749 | */ | |
750 | if (__kfifo_len(conn->mgmtqueue)) | |
751 | goto check_mgmt; | |
7996a778 | 752 | } |
b6c395ed | 753 | spin_unlock_bh(&conn->session->lock); |
3219e529 | 754 | return -ENODATA; |
7996a778 MC |
755 | |
756 | again: | |
757 | if (unlikely(conn->suspend_tx)) | |
77a23c21 MC |
758 | rc = -ENODATA; |
759 | spin_unlock_bh(&conn->session->lock); | |
3219e529 | 760 | return rc; |
7996a778 MC |
761 | } |
762 | ||
c4028958 | 763 | static void iscsi_xmitworker(struct work_struct *work) |
7996a778 | 764 | { |
c4028958 DH |
765 | struct iscsi_conn *conn = |
766 | container_of(work, struct iscsi_conn, xmitwork); | |
3219e529 | 767 | int rc; |
7996a778 MC |
768 | /* |
769 | * serialize Xmit worker on a per-connection basis. | |
770 | */ | |
3219e529 MC |
771 | do { |
772 | rc = iscsi_data_xmit(conn); | |
773 | } while (rc >= 0 || rc == -EAGAIN); | |
7996a778 MC |
774 | } |
775 | ||
776 | enum { | |
777 | FAILURE_BAD_HOST = 1, | |
778 | FAILURE_SESSION_FAILED, | |
779 | FAILURE_SESSION_FREED, | |
780 | FAILURE_WINDOW_CLOSED, | |
60ecebf5 | 781 | FAILURE_OOM, |
7996a778 | 782 | FAILURE_SESSION_TERMINATE, |
656cffc9 | 783 | FAILURE_SESSION_IN_RECOVERY, |
7996a778 MC |
784 | FAILURE_SESSION_RECOVERY_TIMEOUT, |
785 | }; | |
786 | ||
787 | int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *)) | |
788 | { | |
789 | struct Scsi_Host *host; | |
790 | int reason = 0; | |
791 | struct iscsi_session *session; | |
792 | struct iscsi_conn *conn; | |
793 | struct iscsi_cmd_task *ctask = NULL; | |
794 | ||
795 | sc->scsi_done = done; | |
796 | sc->result = 0; | |
f47f2cf5 | 797 | sc->SCp.ptr = NULL; |
7996a778 MC |
798 | |
799 | host = sc->device->host; | |
800 | session = iscsi_hostdata(host->hostdata); | |
801 | ||
802 | spin_lock(&session->lock); | |
803 | ||
656cffc9 MC |
804 | /* |
805 | * ISCSI_STATE_FAILED is a temp. state. The recovery | |
806 | * code will decide what is best to do with command queued | |
807 | * during this time | |
808 | */ | |
809 | if (session->state != ISCSI_STATE_LOGGED_IN && | |
810 | session->state != ISCSI_STATE_FAILED) { | |
811 | /* | |
812 | * to handle the race between when we set the recovery state | |
813 | * and block the session we requeue here (commands could | |
814 | * be entering our queuecommand while a block is starting | |
815 | * up because the block code is not locked) | |
816 | */ | |
817 | if (session->state == ISCSI_STATE_IN_RECOVERY) { | |
818 | reason = FAILURE_SESSION_IN_RECOVERY; | |
67a61114 | 819 | goto reject; |
7996a778 | 820 | } |
656cffc9 MC |
821 | |
822 | if (session->state == ISCSI_STATE_RECOVERY_FAILED) | |
823 | reason = FAILURE_SESSION_RECOVERY_TIMEOUT; | |
824 | else if (session->state == ISCSI_STATE_TERMINATE) | |
825 | reason = FAILURE_SESSION_TERMINATE; | |
826 | else | |
827 | reason = FAILURE_SESSION_FREED; | |
7996a778 MC |
828 | goto fault; |
829 | } | |
830 | ||
7996a778 | 831 | conn = session->leadconn; |
98644047 MC |
832 | if (!conn) { |
833 | reason = FAILURE_SESSION_FREED; | |
834 | goto fault; | |
835 | } | |
7996a778 | 836 | |
77a23c21 MC |
837 | /* |
838 | * We check this here and in data xmit, because if we get to the point | |
839 | * that this check is hitting the window then we have enough IO in | |
840 | * flight and enough IO waiting to be transmitted it is better | |
841 | * to let the scsi/block layer queue up. | |
842 | */ | |
843 | if (iscsi_check_cmdsn_window_closed(conn)) { | |
844 | reason = FAILURE_WINDOW_CLOSED; | |
845 | goto reject; | |
846 | } | |
847 | ||
60ecebf5 MC |
848 | if (!__kfifo_get(session->cmdpool.queue, (void*)&ctask, |
849 | sizeof(void*))) { | |
850 | reason = FAILURE_OOM; | |
851 | goto reject; | |
852 | } | |
7996a778 MC |
853 | sc->SCp.phase = session->age; |
854 | sc->SCp.ptr = (char *)ctask; | |
855 | ||
60ecebf5 | 856 | atomic_set(&ctask->refcount, 1); |
b6c395ed | 857 | ctask->state = ISCSI_TASK_PENDING; |
7996a778 MC |
858 | ctask->mtask = NULL; |
859 | ctask->conn = conn; | |
860 | ctask->sc = sc; | |
861 | INIT_LIST_HEAD(&ctask->running); | |
7996a778 | 862 | |
b6c395ed | 863 | list_add_tail(&ctask->running, &conn->xmitqueue); |
7996a778 MC |
864 | spin_unlock(&session->lock); |
865 | ||
866 | scsi_queue_work(host, &conn->xmitwork); | |
867 | return 0; | |
868 | ||
869 | reject: | |
870 | spin_unlock(&session->lock); | |
871 | debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason); | |
872 | return SCSI_MLQUEUE_HOST_BUSY; | |
873 | ||
874 | fault: | |
875 | spin_unlock(&session->lock); | |
be2df72e | 876 | printk(KERN_ERR "iscsi: cmd 0x%x is not queued (%d)\n", |
7996a778 MC |
877 | sc->cmnd[0], reason); |
878 | sc->result = (DID_NO_CONNECT << 16); | |
1c138991 | 879 | scsi_set_resid(sc, scsi_bufflen(sc)); |
7996a778 MC |
880 | sc->scsi_done(sc); |
881 | return 0; | |
882 | } | |
883 | EXPORT_SYMBOL_GPL(iscsi_queuecommand); | |
884 | ||
885 | int iscsi_change_queue_depth(struct scsi_device *sdev, int depth) | |
886 | { | |
887 | if (depth > ISCSI_MAX_CMD_PER_LUN) | |
888 | depth = ISCSI_MAX_CMD_PER_LUN; | |
889 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); | |
890 | return sdev->queue_depth; | |
891 | } | |
892 | EXPORT_SYMBOL_GPL(iscsi_change_queue_depth); | |
893 | ||
77a23c21 MC |
894 | static struct iscsi_mgmt_task * |
895 | __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
896 | char *data, uint32_t data_size) | |
7996a778 MC |
897 | { |
898 | struct iscsi_session *session = conn->session; | |
7996a778 MC |
899 | struct iscsi_mgmt_task *mtask; |
900 | ||
77a23c21 MC |
901 | if (session->state == ISCSI_STATE_TERMINATE) |
902 | return NULL; | |
903 | ||
7996a778 MC |
904 | if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) || |
905 | hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE)) | |
906 | /* | |
907 | * Login and Text are sent serially, in | |
908 | * request-followed-by-response sequence. | |
909 | * Same mtask can be used. Same ITT must be used. | |
910 | * Note that login_mtask is preallocated at conn_create(). | |
911 | */ | |
912 | mtask = conn->login_mtask; | |
913 | else { | |
656cffc9 MC |
914 | BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); |
915 | BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); | |
7996a778 MC |
916 | |
917 | if (!__kfifo_get(session->mgmtpool.queue, | |
77a23c21 MC |
918 | (void*)&mtask, sizeof(void*))) |
919 | return NULL; | |
7996a778 MC |
920 | } |
921 | ||
7996a778 MC |
922 | if (data_size) { |
923 | memcpy(mtask->data, data, data_size); | |
924 | mtask->data_count = data_size; | |
925 | } else | |
926 | mtask->data_count = 0; | |
927 | ||
928 | INIT_LIST_HEAD(&mtask->running); | |
929 | memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr)); | |
77a23c21 MC |
930 | __kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*)); |
931 | return mtask; | |
7996a778 MC |
932 | } |
933 | ||
934 | int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, | |
935 | char *data, uint32_t data_size) | |
936 | { | |
937 | struct iscsi_conn *conn = cls_conn->dd_data; | |
77a23c21 MC |
938 | struct iscsi_session *session = conn->session; |
939 | int err = 0; | |
7996a778 | 940 | |
77a23c21 MC |
941 | spin_lock_bh(&session->lock); |
942 | if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size)) | |
943 | err = -EPERM; | |
944 | spin_unlock_bh(&session->lock); | |
945 | scsi_queue_work(session->host, &conn->xmitwork); | |
946 | return err; | |
7996a778 MC |
947 | } |
948 | EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); | |
949 | ||
950 | void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session) | |
951 | { | |
952 | struct iscsi_session *session = class_to_transport_session(cls_session); | |
953 | struct iscsi_conn *conn = session->leadconn; | |
954 | ||
955 | spin_lock_bh(&session->lock); | |
956 | if (session->state != ISCSI_STATE_LOGGED_IN) { | |
656cffc9 | 957 | session->state = ISCSI_STATE_RECOVERY_FAILED; |
7996a778 MC |
958 | if (conn) |
959 | wake_up(&conn->ehwait); | |
960 | } | |
961 | spin_unlock_bh(&session->lock); | |
962 | } | |
963 | EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout); | |
964 | ||
965 | int iscsi_eh_host_reset(struct scsi_cmnd *sc) | |
966 | { | |
967 | struct Scsi_Host *host = sc->device->host; | |
968 | struct iscsi_session *session = iscsi_hostdata(host->hostdata); | |
969 | struct iscsi_conn *conn = session->leadconn; | |
970 | int fail_session = 0; | |
971 | ||
972 | spin_lock_bh(&session->lock); | |
973 | if (session->state == ISCSI_STATE_TERMINATE) { | |
974 | failed: | |
975 | debug_scsi("failing host reset: session terminated " | |
d6e24d1c | 976 | "[CID %d age %d]\n", conn->id, session->age); |
7996a778 MC |
977 | spin_unlock_bh(&session->lock); |
978 | return FAILED; | |
979 | } | |
980 | ||
981 | if (sc->SCp.phase == session->age) { | |
d6e24d1c | 982 | debug_scsi("failing connection CID %d due to SCSI host reset\n", |
7996a778 MC |
983 | conn->id); |
984 | fail_session = 1; | |
985 | } | |
986 | spin_unlock_bh(&session->lock); | |
987 | ||
988 | /* | |
989 | * we drop the lock here but the leadconn cannot be destoyed while | |
990 | * we are in the scsi eh | |
991 | */ | |
656cffc9 | 992 | if (fail_session) |
7996a778 | 993 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
7996a778 MC |
994 | |
995 | debug_scsi("iscsi_eh_host_reset wait for relogin\n"); | |
996 | wait_event_interruptible(conn->ehwait, | |
997 | session->state == ISCSI_STATE_TERMINATE || | |
998 | session->state == ISCSI_STATE_LOGGED_IN || | |
656cffc9 | 999 | session->state == ISCSI_STATE_RECOVERY_FAILED); |
7996a778 MC |
1000 | if (signal_pending(current)) |
1001 | flush_signals(current); | |
1002 | ||
1003 | spin_lock_bh(&session->lock); | |
1004 | if (session->state == ISCSI_STATE_LOGGED_IN) | |
be2df72e | 1005 | printk(KERN_INFO "iscsi: host reset succeeded\n"); |
7996a778 MC |
1006 | else |
1007 | goto failed; | |
1008 | spin_unlock_bh(&session->lock); | |
1009 | ||
1010 | return SUCCESS; | |
1011 | } | |
1012 | EXPORT_SYMBOL_GPL(iscsi_eh_host_reset); | |
1013 | ||
1014 | static void iscsi_tmabort_timedout(unsigned long data) | |
1015 | { | |
1016 | struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)data; | |
1017 | struct iscsi_conn *conn = ctask->conn; | |
1018 | struct iscsi_session *session = conn->session; | |
1019 | ||
1020 | spin_lock(&session->lock); | |
1021 | if (conn->tmabort_state == TMABORT_INITIAL) { | |
1022 | conn->tmabort_state = TMABORT_TIMEDOUT; | |
1023 | debug_scsi("tmabort timedout [sc %p itt 0x%x]\n", | |
1024 | ctask->sc, ctask->itt); | |
1025 | /* unblock eh_abort() */ | |
1026 | wake_up(&conn->ehwait); | |
1027 | } | |
1028 | spin_unlock(&session->lock); | |
1029 | } | |
1030 | ||
7996a778 MC |
1031 | static int iscsi_exec_abort_task(struct scsi_cmnd *sc, |
1032 | struct iscsi_cmd_task *ctask) | |
1033 | { | |
1034 | struct iscsi_conn *conn = ctask->conn; | |
1035 | struct iscsi_session *session = conn->session; | |
1036 | struct iscsi_tm *hdr = &conn->tmhdr; | |
7996a778 MC |
1037 | |
1038 | /* | |
1039 | * ctask timed out but session is OK requests must be serialized. | |
1040 | */ | |
1041 | memset(hdr, 0, sizeof(struct iscsi_tm)); | |
1042 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
1043 | hdr->flags = ISCSI_TM_FUNC_ABORT_TASK; | |
1044 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
1045 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); | |
1046 | hdr->rtt = ctask->hdr->itt; | |
1047 | hdr->refcmdsn = ctask->hdr->cmdsn; | |
1048 | ||
77a23c21 MC |
1049 | ctask->mtask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr, |
1050 | NULL, 0); | |
1051 | if (!ctask->mtask) { | |
7996a778 | 1052 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
77a23c21 MC |
1053 | debug_scsi("abort sent failure [itt 0x%x]\n", ctask->itt); |
1054 | return -EPERM; | |
7996a778 | 1055 | } |
77a23c21 | 1056 | ctask->state = ISCSI_TASK_ABORTING; |
7996a778 MC |
1057 | |
1058 | debug_scsi("abort sent [itt 0x%x]\n", ctask->itt); | |
1059 | ||
7996a778 MC |
1060 | if (conn->tmabort_state == TMABORT_INITIAL) { |
1061 | conn->tmfcmd_pdus_cnt++; | |
77a23c21 | 1062 | conn->tmabort_timer.expires = 20*HZ + jiffies; |
7996a778 MC |
1063 | conn->tmabort_timer.function = iscsi_tmabort_timedout; |
1064 | conn->tmabort_timer.data = (unsigned long)ctask; | |
1065 | add_timer(&conn->tmabort_timer); | |
d6e24d1c | 1066 | debug_scsi("abort set timeout [itt 0x%x]\n", ctask->itt); |
7996a778 MC |
1067 | } |
1068 | spin_unlock_bh(&session->lock); | |
77a23c21 | 1069 | scsi_queue_work(session->host, &conn->xmitwork); |
7996a778 MC |
1070 | |
1071 | /* | |
1072 | * block eh thread until: | |
1073 | * | |
1074 | * 1) abort response | |
1075 | * 2) abort timeout | |
1076 | * 3) session is terminated or restarted or userspace has | |
1077 | * given up on recovery | |
1078 | */ | |
1079 | wait_event_interruptible(conn->ehwait, | |
1080 | sc->SCp.phase != session->age || | |
1081 | session->state != ISCSI_STATE_LOGGED_IN || | |
656cffc9 | 1082 | conn->tmabort_state != TMABORT_INITIAL); |
7996a778 MC |
1083 | if (signal_pending(current)) |
1084 | flush_signals(current); | |
1085 | del_timer_sync(&conn->tmabort_timer); | |
77a23c21 | 1086 | spin_lock_bh(&session->lock); |
7996a778 MC |
1087 | return 0; |
1088 | } | |
1089 | ||
1090 | /* | |
77a23c21 | 1091 | * session lock must be held |
7996a778 | 1092 | */ |
b6c395ed MC |
1093 | static struct iscsi_mgmt_task * |
1094 | iscsi_remove_mgmt_task(struct kfifo *fifo, uint32_t itt) | |
1095 | { | |
1096 | int i, nr_tasks = __kfifo_len(fifo) / sizeof(void*); | |
1097 | struct iscsi_mgmt_task *task; | |
1098 | ||
1099 | debug_scsi("searching %d tasks\n", nr_tasks); | |
1100 | ||
1101 | for (i = 0; i < nr_tasks; i++) { | |
1102 | __kfifo_get(fifo, (void*)&task, sizeof(void*)); | |
1103 | debug_scsi("check task %u\n", task->itt); | |
1104 | ||
1105 | if (task->itt == itt) { | |
1106 | debug_scsi("matched task\n"); | |
1107 | return task; | |
1108 | } | |
7996a778 | 1109 | |
b6c395ed MC |
1110 | __kfifo_put(fifo, (void*)&task, sizeof(void*)); |
1111 | } | |
1112 | return NULL; | |
1113 | } | |
7996a778 MC |
1114 | |
1115 | static int iscsi_ctask_mtask_cleanup(struct iscsi_cmd_task *ctask) | |
1116 | { | |
1117 | struct iscsi_conn *conn = ctask->conn; | |
1118 | struct iscsi_session *session = conn->session; | |
1119 | ||
1120 | if (!ctask->mtask) | |
1121 | return -EINVAL; | |
1122 | ||
77a23c21 | 1123 | if (!iscsi_remove_mgmt_task(conn->mgmtqueue, ctask->mtask->itt)) |
7996a778 MC |
1124 | list_del(&ctask->mtask->running); |
1125 | __kfifo_put(session->mgmtpool.queue, (void*)&ctask->mtask, | |
1126 | sizeof(void*)); | |
1127 | ctask->mtask = NULL; | |
1128 | return 0; | |
1129 | } | |
1130 | ||
1131 | /* | |
77a23c21 | 1132 | * session lock must be held |
7996a778 MC |
1133 | */ |
1134 | static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, | |
1135 | int err) | |
1136 | { | |
1137 | struct scsi_cmnd *sc; | |
1138 | ||
7996a778 MC |
1139 | sc = ctask->sc; |
1140 | if (!sc) | |
1141 | return; | |
e648f63c | 1142 | |
77a23c21 MC |
1143 | if (ctask->state != ISCSI_TASK_PENDING) |
1144 | conn->session->tt->cleanup_cmd_task(conn, ctask); | |
7ea8b828 MC |
1145 | iscsi_ctask_mtask_cleanup(ctask); |
1146 | ||
7996a778 | 1147 | sc->result = err; |
1c138991 | 1148 | scsi_set_resid(sc, scsi_bufflen(sc)); |
77a23c21 MC |
1149 | if (conn->ctask == ctask) |
1150 | conn->ctask = NULL; | |
e648f63c | 1151 | /* release ref from queuecommand */ |
60ecebf5 | 1152 | __iscsi_put_ctask(ctask); |
7996a778 MC |
1153 | } |
1154 | ||
1155 | int iscsi_eh_abort(struct scsi_cmnd *sc) | |
1156 | { | |
f47f2cf5 MC |
1157 | struct iscsi_cmd_task *ctask; |
1158 | struct iscsi_conn *conn; | |
1159 | struct iscsi_session *session; | |
7996a778 MC |
1160 | int rc; |
1161 | ||
f47f2cf5 MC |
1162 | /* |
1163 | * if session was ISCSI_STATE_IN_RECOVERY then we may not have | |
1164 | * got the command. | |
1165 | */ | |
1166 | if (!sc->SCp.ptr) { | |
1167 | debug_scsi("sc never reached iscsi layer or it completed.\n"); | |
1168 | return SUCCESS; | |
1169 | } | |
1170 | ||
1171 | ctask = (struct iscsi_cmd_task *)sc->SCp.ptr; | |
1172 | conn = ctask->conn; | |
1173 | session = conn->session; | |
1174 | ||
7996a778 MC |
1175 | conn->eh_abort_cnt++; |
1176 | debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt); | |
1177 | ||
7996a778 MC |
1178 | spin_lock_bh(&session->lock); |
1179 | ||
1180 | /* | |
1181 | * If we are not logged in or we have started a new session | |
1182 | * then let the host reset code handle this | |
1183 | */ | |
1184 | if (session->state != ISCSI_STATE_LOGGED_IN || | |
1185 | sc->SCp.phase != session->age) | |
1186 | goto failed; | |
1187 | ||
1188 | /* ctask completed before time out */ | |
7ea8b828 | 1189 | if (!ctask->sc) { |
7ea8b828 | 1190 | debug_scsi("sc completed while abort in progress\n"); |
77a23c21 | 1191 | goto success; |
7ea8b828 | 1192 | } |
7996a778 MC |
1193 | |
1194 | /* what should we do here ? */ | |
1195 | if (conn->ctask == ctask) { | |
be2df72e OG |
1196 | printk(KERN_INFO "iscsi: sc %p itt 0x%x partially sent. " |
1197 | "Failing abort\n", sc, ctask->itt); | |
7996a778 MC |
1198 | goto failed; |
1199 | } | |
1200 | ||
77a23c21 MC |
1201 | if (ctask->state == ISCSI_TASK_PENDING) { |
1202 | fail_command(conn, ctask, DID_ABORT << 16); | |
1203 | goto success; | |
1204 | } | |
7996a778 MC |
1205 | |
1206 | conn->tmabort_state = TMABORT_INITIAL; | |
7996a778 | 1207 | rc = iscsi_exec_abort_task(sc, ctask); |
7996a778 MC |
1208 | if (rc || sc->SCp.phase != session->age || |
1209 | session->state != ISCSI_STATE_LOGGED_IN) | |
1210 | goto failed; | |
7ea8b828 | 1211 | iscsi_ctask_mtask_cleanup(ctask); |
7996a778 | 1212 | |
7ea8b828 MC |
1213 | switch (conn->tmabort_state) { |
1214 | case TMABORT_SUCCESS: | |
77a23c21 MC |
1215 | spin_unlock_bh(&session->lock); |
1216 | /* | |
1217 | * clean up task if aborted. grab the recv lock as a writer | |
1218 | */ | |
1219 | write_lock_bh(conn->recv_lock); | |
1220 | spin_lock(&session->lock); | |
1221 | fail_command(conn, ctask, DID_ABORT << 16); | |
1222 | spin_unlock(&session->lock); | |
1223 | write_unlock_bh(conn->recv_lock); | |
1224 | /* | |
1225 | * make sure xmit thread is not still touching the | |
1226 | * ctask/scsi_cmnd | |
1227 | */ | |
1228 | scsi_flush_work(session->host); | |
1229 | goto success_unlocked; | |
7ea8b828 MC |
1230 | case TMABORT_NOT_FOUND: |
1231 | if (!ctask->sc) { | |
1232 | /* ctask completed before tmf abort response */ | |
7ea8b828 | 1233 | debug_scsi("sc completed while abort in progress\n"); |
77a23c21 | 1234 | goto success; |
7ea8b828 MC |
1235 | } |
1236 | /* fall through */ | |
1237 | default: | |
1238 | /* timedout or failed */ | |
7996a778 MC |
1239 | spin_unlock_bh(&session->lock); |
1240 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
77a23c21 | 1241 | goto failed_unlocked; |
7996a778 MC |
1242 | } |
1243 | ||
77a23c21 | 1244 | success: |
7996a778 | 1245 | spin_unlock_bh(&session->lock); |
77a23c21 MC |
1246 | success_unlocked: |
1247 | debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); | |
7996a778 MC |
1248 | return SUCCESS; |
1249 | ||
1250 | failed: | |
1251 | spin_unlock_bh(&session->lock); | |
77a23c21 | 1252 | failed_unlocked: |
7996a778 MC |
1253 | debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); |
1254 | return FAILED; | |
1255 | } | |
1256 | EXPORT_SYMBOL_GPL(iscsi_eh_abort); | |
1257 | ||
1258 | int | |
1259 | iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size) | |
1260 | { | |
1261 | int i; | |
1262 | ||
1263 | *items = kmalloc(max * sizeof(void*), GFP_KERNEL); | |
1264 | if (*items == NULL) | |
1265 | return -ENOMEM; | |
1266 | ||
1267 | q->max = max; | |
1268 | q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL); | |
1269 | if (q->pool == NULL) { | |
1270 | kfree(*items); | |
1271 | return -ENOMEM; | |
1272 | } | |
1273 | ||
1274 | q->queue = kfifo_init((void*)q->pool, max * sizeof(void*), | |
1275 | GFP_KERNEL, NULL); | |
1276 | if (q->queue == ERR_PTR(-ENOMEM)) { | |
1277 | kfree(q->pool); | |
1278 | kfree(*items); | |
1279 | return -ENOMEM; | |
1280 | } | |
1281 | ||
1282 | for (i = 0; i < max; i++) { | |
1283 | q->pool[i] = kmalloc(item_size, GFP_KERNEL); | |
1284 | if (q->pool[i] == NULL) { | |
1285 | int j; | |
1286 | ||
1287 | for (j = 0; j < i; j++) | |
1288 | kfree(q->pool[j]); | |
1289 | ||
1290 | kfifo_free(q->queue); | |
1291 | kfree(q->pool); | |
1292 | kfree(*items); | |
1293 | return -ENOMEM; | |
1294 | } | |
1295 | memset(q->pool[i], 0, item_size); | |
1296 | (*items)[i] = q->pool[i]; | |
1297 | __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*)); | |
1298 | } | |
1299 | return 0; | |
1300 | } | |
1301 | EXPORT_SYMBOL_GPL(iscsi_pool_init); | |
1302 | ||
1303 | void iscsi_pool_free(struct iscsi_queue *q, void **items) | |
1304 | { | |
1305 | int i; | |
1306 | ||
1307 | for (i = 0; i < q->max; i++) | |
1308 | kfree(items[i]); | |
1309 | kfree(q->pool); | |
1310 | kfree(items); | |
1311 | } | |
1312 | EXPORT_SYMBOL_GPL(iscsi_pool_free); | |
1313 | ||
1314 | /* | |
1315 | * iSCSI Session's hostdata organization: | |
1316 | * | |
1317 | * *------------------* <== hostdata_session(host->hostdata) | |
1318 | * | ptr to class sess| | |
1319 | * |------------------| <== iscsi_hostdata(host->hostdata) | |
1320 | * | iscsi_session | | |
1321 | * *------------------* | |
1322 | */ | |
1323 | ||
1324 | #define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \ | |
1325 | _sz % sizeof(unsigned long)) | |
1326 | ||
1327 | #define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata)) | |
1328 | ||
1329 | /** | |
1330 | * iscsi_session_setup - create iscsi cls session and host and session | |
1331 | * @scsit: scsi transport template | |
1332 | * @iscsit: iscsi transport template | |
1548271e MC |
1333 | * @cmds_max: scsi host can queue |
1334 | * @qdepth: scsi host cmds per lun | |
1335 | * @cmd_task_size: LLD ctask private data size | |
1336 | * @mgmt_task_size: LLD mtask private data size | |
7996a778 MC |
1337 | * @initial_cmdsn: initial CmdSN |
1338 | * @hostno: host no allocated | |
1339 | * | |
1340 | * This can be used by software iscsi_transports that allocate | |
1341 | * a session per scsi host. | |
1342 | **/ | |
1343 | struct iscsi_cls_session * | |
1344 | iscsi_session_setup(struct iscsi_transport *iscsit, | |
1345 | struct scsi_transport_template *scsit, | |
1548271e | 1346 | uint16_t cmds_max, uint16_t qdepth, |
7996a778 MC |
1347 | int cmd_task_size, int mgmt_task_size, |
1348 | uint32_t initial_cmdsn, uint32_t *hostno) | |
1349 | { | |
1350 | struct Scsi_Host *shost; | |
1351 | struct iscsi_session *session; | |
1352 | struct iscsi_cls_session *cls_session; | |
1353 | int cmd_i; | |
1354 | ||
1548271e MC |
1355 | if (qdepth > ISCSI_MAX_CMD_PER_LUN || qdepth < 1) { |
1356 | if (qdepth != 0) | |
1357 | printk(KERN_ERR "iscsi: invalid queue depth of %d. " | |
1358 | "Queue depth must be between 1 and %d.\n", | |
1359 | qdepth, ISCSI_MAX_CMD_PER_LUN); | |
1360 | qdepth = ISCSI_DEF_CMD_PER_LUN; | |
1361 | } | |
1362 | ||
1363 | if (cmds_max < 2 || (cmds_max & (cmds_max - 1)) || | |
1364 | cmds_max >= ISCSI_MGMT_ITT_OFFSET) { | |
1365 | if (cmds_max != 0) | |
1366 | printk(KERN_ERR "iscsi: invalid can_queue of %d. " | |
1367 | "can_queue must be a power of 2 and between " | |
1368 | "2 and %d - setting to %d.\n", cmds_max, | |
1369 | ISCSI_MGMT_ITT_OFFSET, ISCSI_DEF_XMIT_CMDS_MAX); | |
1370 | cmds_max = ISCSI_DEF_XMIT_CMDS_MAX; | |
1371 | } | |
1372 | ||
7996a778 MC |
1373 | shost = scsi_host_alloc(iscsit->host_template, |
1374 | hostdata_privsize(sizeof(*session))); | |
1375 | if (!shost) | |
1376 | return NULL; | |
1377 | ||
1548271e MC |
1378 | /* the iscsi layer takes one task for reserve */ |
1379 | shost->can_queue = cmds_max - 1; | |
1380 | shost->cmd_per_lun = qdepth; | |
7996a778 MC |
1381 | shost->max_id = 1; |
1382 | shost->max_channel = 0; | |
1383 | shost->max_lun = iscsit->max_lun; | |
1384 | shost->max_cmd_len = iscsit->max_cmd_len; | |
1385 | shost->transportt = scsit; | |
1386 | shost->transportt->create_work_queue = 1; | |
1387 | *hostno = shost->host_no; | |
1388 | ||
1389 | session = iscsi_hostdata(shost->hostdata); | |
1390 | memset(session, 0, sizeof(struct iscsi_session)); | |
1391 | session->host = shost; | |
1392 | session->state = ISCSI_STATE_FREE; | |
1393 | session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX; | |
1548271e | 1394 | session->cmds_max = cmds_max; |
7996a778 MC |
1395 | session->cmdsn = initial_cmdsn; |
1396 | session->exp_cmdsn = initial_cmdsn + 1; | |
1397 | session->max_cmdsn = initial_cmdsn + 1; | |
1398 | session->max_r2t = 1; | |
1399 | session->tt = iscsit; | |
1400 | ||
1401 | /* initialize SCSI PDU commands pool */ | |
1402 | if (iscsi_pool_init(&session->cmdpool, session->cmds_max, | |
1403 | (void***)&session->cmds, | |
1404 | cmd_task_size + sizeof(struct iscsi_cmd_task))) | |
1405 | goto cmdpool_alloc_fail; | |
1406 | ||
1407 | /* pre-format cmds pool with ITT */ | |
1408 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
1409 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; | |
1410 | ||
1411 | if (cmd_task_size) | |
1412 | ctask->dd_data = &ctask[1]; | |
1413 | ctask->itt = cmd_i; | |
b6c395ed | 1414 | INIT_LIST_HEAD(&ctask->running); |
7996a778 MC |
1415 | } |
1416 | ||
1417 | spin_lock_init(&session->lock); | |
7996a778 MC |
1418 | |
1419 | /* initialize immediate command pool */ | |
1420 | if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max, | |
1421 | (void***)&session->mgmt_cmds, | |
1422 | mgmt_task_size + sizeof(struct iscsi_mgmt_task))) | |
1423 | goto mgmtpool_alloc_fail; | |
1424 | ||
1425 | ||
1426 | /* pre-format immediate cmds pool with ITT */ | |
1427 | for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) { | |
1428 | struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i]; | |
1429 | ||
1430 | if (mgmt_task_size) | |
1431 | mtask->dd_data = &mtask[1]; | |
1432 | mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i; | |
b6c395ed | 1433 | INIT_LIST_HEAD(&mtask->running); |
7996a778 MC |
1434 | } |
1435 | ||
1436 | if (scsi_add_host(shost, NULL)) | |
1437 | goto add_host_fail; | |
1438 | ||
f53a88da MC |
1439 | if (!try_module_get(iscsit->owner)) |
1440 | goto cls_session_fail; | |
1441 | ||
6a8a0d36 | 1442 | cls_session = iscsi_create_session(shost, iscsit, 0); |
7996a778 | 1443 | if (!cls_session) |
f53a88da | 1444 | goto module_put; |
7996a778 MC |
1445 | *(unsigned long*)shost->hostdata = (unsigned long)cls_session; |
1446 | ||
1447 | return cls_session; | |
1448 | ||
f53a88da MC |
1449 | module_put: |
1450 | module_put(iscsit->owner); | |
7996a778 MC |
1451 | cls_session_fail: |
1452 | scsi_remove_host(shost); | |
1453 | add_host_fail: | |
7996a778 MC |
1454 | iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds); |
1455 | mgmtpool_alloc_fail: | |
1456 | iscsi_pool_free(&session->cmdpool, (void**)session->cmds); | |
1457 | cmdpool_alloc_fail: | |
1458 | scsi_host_put(shost); | |
1459 | return NULL; | |
1460 | } | |
1461 | EXPORT_SYMBOL_GPL(iscsi_session_setup); | |
1462 | ||
1463 | /** | |
1464 | * iscsi_session_teardown - destroy session, host, and cls_session | |
1465 | * shost: scsi host | |
1466 | * | |
1467 | * This can be used by software iscsi_transports that allocate | |
1468 | * a session per scsi host. | |
1469 | **/ | |
1470 | void iscsi_session_teardown(struct iscsi_cls_session *cls_session) | |
1471 | { | |
1472 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); | |
1473 | struct iscsi_session *session = iscsi_hostdata(shost->hostdata); | |
63f75cc8 | 1474 | struct module *owner = cls_session->transport->owner; |
7996a778 | 1475 | |
464bb99e | 1476 | iscsi_unblock_session(cls_session); |
7996a778 MC |
1477 | scsi_remove_host(shost); |
1478 | ||
7996a778 MC |
1479 | iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds); |
1480 | iscsi_pool_free(&session->cmdpool, (void**)session->cmds); | |
1481 | ||
b2c64167 MC |
1482 | kfree(session->password); |
1483 | kfree(session->password_in); | |
1484 | kfree(session->username); | |
1485 | kfree(session->username_in); | |
f3ff0c36 | 1486 | kfree(session->targetname); |
d8196ed2 | 1487 | kfree(session->netdev); |
0801c242 | 1488 | kfree(session->hwaddress); |
8ad5781a | 1489 | kfree(session->initiatorname); |
f3ff0c36 | 1490 | |
7996a778 MC |
1491 | iscsi_destroy_session(cls_session); |
1492 | scsi_host_put(shost); | |
63f75cc8 | 1493 | module_put(owner); |
7996a778 MC |
1494 | } |
1495 | EXPORT_SYMBOL_GPL(iscsi_session_teardown); | |
1496 | ||
1497 | /** | |
1498 | * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn | |
1499 | * @cls_session: iscsi_cls_session | |
1500 | * @conn_idx: cid | |
1501 | **/ | |
1502 | struct iscsi_cls_conn * | |
1503 | iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx) | |
1504 | { | |
1505 | struct iscsi_session *session = class_to_transport_session(cls_session); | |
1506 | struct iscsi_conn *conn; | |
1507 | struct iscsi_cls_conn *cls_conn; | |
d36ab6f3 | 1508 | char *data; |
7996a778 MC |
1509 | |
1510 | cls_conn = iscsi_create_conn(cls_session, conn_idx); | |
1511 | if (!cls_conn) | |
1512 | return NULL; | |
1513 | conn = cls_conn->dd_data; | |
1514 | memset(conn, 0, sizeof(*conn)); | |
1515 | ||
1516 | conn->session = session; | |
1517 | conn->cls_conn = cls_conn; | |
1518 | conn->c_stage = ISCSI_CONN_INITIAL_STAGE; | |
1519 | conn->id = conn_idx; | |
1520 | conn->exp_statsn = 0; | |
1521 | conn->tmabort_state = TMABORT_INITIAL; | |
1522 | INIT_LIST_HEAD(&conn->run_list); | |
1523 | INIT_LIST_HEAD(&conn->mgmt_run_list); | |
b6c395ed | 1524 | INIT_LIST_HEAD(&conn->xmitqueue); |
7996a778 MC |
1525 | |
1526 | /* initialize general immediate & non-immediate PDU commands queue */ | |
7996a778 MC |
1527 | conn->mgmtqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*), |
1528 | GFP_KERNEL, NULL); | |
1529 | if (conn->mgmtqueue == ERR_PTR(-ENOMEM)) | |
1530 | goto mgmtqueue_alloc_fail; | |
1531 | ||
c4028958 | 1532 | INIT_WORK(&conn->xmitwork, iscsi_xmitworker); |
7996a778 MC |
1533 | |
1534 | /* allocate login_mtask used for the login/text sequences */ | |
1535 | spin_lock_bh(&session->lock); | |
1536 | if (!__kfifo_get(session->mgmtpool.queue, | |
1537 | (void*)&conn->login_mtask, | |
1538 | sizeof(void*))) { | |
1539 | spin_unlock_bh(&session->lock); | |
1540 | goto login_mtask_alloc_fail; | |
1541 | } | |
1542 | spin_unlock_bh(&session->lock); | |
1543 | ||
bf32ed33 | 1544 | data = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL); |
d36ab6f3 MC |
1545 | if (!data) |
1546 | goto login_mtask_data_alloc_fail; | |
c8dc1e52 | 1547 | conn->login_mtask->data = conn->data = data; |
d36ab6f3 | 1548 | |
7996a778 | 1549 | init_timer(&conn->tmabort_timer); |
7996a778 MC |
1550 | init_waitqueue_head(&conn->ehwait); |
1551 | ||
1552 | return cls_conn; | |
1553 | ||
d36ab6f3 MC |
1554 | login_mtask_data_alloc_fail: |
1555 | __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask, | |
1556 | sizeof(void*)); | |
7996a778 MC |
1557 | login_mtask_alloc_fail: |
1558 | kfifo_free(conn->mgmtqueue); | |
1559 | mgmtqueue_alloc_fail: | |
7996a778 MC |
1560 | iscsi_destroy_conn(cls_conn); |
1561 | return NULL; | |
1562 | } | |
1563 | EXPORT_SYMBOL_GPL(iscsi_conn_setup); | |
1564 | ||
1565 | /** | |
1566 | * iscsi_conn_teardown - teardown iscsi connection | |
1567 | * cls_conn: iscsi class connection | |
1568 | * | |
1569 | * TODO: we may need to make this into a two step process | |
1570 | * like scsi-mls remove + put host | |
1571 | */ | |
1572 | void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) | |
1573 | { | |
1574 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1575 | struct iscsi_session *session = conn->session; | |
1576 | unsigned long flags; | |
1577 | ||
7996a778 | 1578 | spin_lock_bh(&session->lock); |
77a23c21 | 1579 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
7996a778 MC |
1580 | conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; |
1581 | if (session->leadconn == conn) { | |
1582 | /* | |
1583 | * leading connection? then give up on recovery. | |
1584 | */ | |
1585 | session->state = ISCSI_STATE_TERMINATE; | |
1586 | wake_up(&conn->ehwait); | |
1587 | } | |
1588 | spin_unlock_bh(&session->lock); | |
1589 | ||
7996a778 MC |
1590 | /* |
1591 | * Block until all in-progress commands for this connection | |
1592 | * time out or fail. | |
1593 | */ | |
1594 | for (;;) { | |
1595 | spin_lock_irqsave(session->host->host_lock, flags); | |
1596 | if (!session->host->host_busy) { /* OK for ERL == 0 */ | |
1597 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
1598 | break; | |
1599 | } | |
1600 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
1601 | msleep_interruptible(500); | |
be2df72e OG |
1602 | printk(KERN_INFO "iscsi: scsi conn_destroy(): host_busy %d " |
1603 | "host_failed %d\n", session->host->host_busy, | |
1604 | session->host->host_failed); | |
7996a778 MC |
1605 | /* |
1606 | * force eh_abort() to unblock | |
1607 | */ | |
1608 | wake_up(&conn->ehwait); | |
1609 | } | |
1610 | ||
779ea120 MC |
1611 | /* flush queued up work because we free the connection below */ |
1612 | scsi_flush_work(session->host); | |
1613 | ||
7996a778 | 1614 | spin_lock_bh(&session->lock); |
c8dc1e52 | 1615 | kfree(conn->data); |
f3ff0c36 | 1616 | kfree(conn->persistent_address); |
7996a778 MC |
1617 | __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask, |
1618 | sizeof(void*)); | |
98644047 | 1619 | if (session->leadconn == conn) { |
7996a778 | 1620 | session->leadconn = NULL; |
7996a778 MC |
1621 | /* no connections exits.. reset sequencing */ |
1622 | session->cmdsn = session->max_cmdsn = session->exp_cmdsn = 1; | |
98644047 | 1623 | } |
7996a778 MC |
1624 | spin_unlock_bh(&session->lock); |
1625 | ||
7996a778 MC |
1626 | kfifo_free(conn->mgmtqueue); |
1627 | ||
1628 | iscsi_destroy_conn(cls_conn); | |
1629 | } | |
1630 | EXPORT_SYMBOL_GPL(iscsi_conn_teardown); | |
1631 | ||
1632 | int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) | |
1633 | { | |
1634 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1635 | struct iscsi_session *session = conn->session; | |
1636 | ||
ffd0436e | 1637 | if (!session) { |
7996a778 MC |
1638 | printk(KERN_ERR "iscsi: can't start unbound connection\n"); |
1639 | return -EPERM; | |
1640 | } | |
1641 | ||
db98ccde MC |
1642 | if ((session->imm_data_en || !session->initial_r2t_en) && |
1643 | session->first_burst > session->max_burst) { | |
ffd0436e MC |
1644 | printk("iscsi: invalid burst lengths: " |
1645 | "first_burst %d max_burst %d\n", | |
1646 | session->first_burst, session->max_burst); | |
1647 | return -EINVAL; | |
1648 | } | |
1649 | ||
7996a778 MC |
1650 | spin_lock_bh(&session->lock); |
1651 | conn->c_stage = ISCSI_CONN_STARTED; | |
1652 | session->state = ISCSI_STATE_LOGGED_IN; | |
1653 | ||
1654 | switch(conn->stop_stage) { | |
1655 | case STOP_CONN_RECOVER: | |
1656 | /* | |
1657 | * unblock eh_abort() if it is blocked. re-try all | |
1658 | * commands after successful recovery | |
1659 | */ | |
7996a778 MC |
1660 | conn->stop_stage = 0; |
1661 | conn->tmabort_state = TMABORT_INITIAL; | |
1662 | session->age++; | |
7996a778 MC |
1663 | spin_unlock_bh(&session->lock); |
1664 | ||
1665 | iscsi_unblock_session(session_to_cls(session)); | |
1666 | wake_up(&conn->ehwait); | |
1667 | return 0; | |
1668 | case STOP_CONN_TERM: | |
7996a778 | 1669 | conn->stop_stage = 0; |
7996a778 MC |
1670 | break; |
1671 | default: | |
1672 | break; | |
1673 | } | |
1674 | spin_unlock_bh(&session->lock); | |
1675 | ||
1676 | return 0; | |
1677 | } | |
1678 | EXPORT_SYMBOL_GPL(iscsi_conn_start); | |
1679 | ||
1680 | static void | |
1681 | flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn) | |
1682 | { | |
1683 | struct iscsi_mgmt_task *mtask, *tmp; | |
1684 | ||
1685 | /* handle pending */ | |
77a23c21 | 1686 | while (__kfifo_get(conn->mgmtqueue, (void*)&mtask, sizeof(void*))) { |
7996a778 MC |
1687 | if (mtask == conn->login_mtask) |
1688 | continue; | |
1689 | debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt); | |
1690 | __kfifo_put(session->mgmtpool.queue, (void*)&mtask, | |
1691 | sizeof(void*)); | |
1692 | } | |
1693 | ||
1694 | /* handle running */ | |
1695 | list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) { | |
1696 | debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt); | |
ed2abc7f MC |
1697 | list_del(&mtask->running); |
1698 | ||
7996a778 MC |
1699 | if (mtask == conn->login_mtask) |
1700 | continue; | |
ed2abc7f | 1701 | __kfifo_put(session->mgmtpool.queue, (void*)&mtask, |
7996a778 MC |
1702 | sizeof(void*)); |
1703 | } | |
1704 | ||
1705 | conn->mtask = NULL; | |
1706 | } | |
1707 | ||
1708 | /* Fail commands. Mutex and session lock held and recv side suspended */ | |
1709 | static void fail_all_commands(struct iscsi_conn *conn) | |
1710 | { | |
1711 | struct iscsi_cmd_task *ctask, *tmp; | |
1712 | ||
1713 | /* flush pending */ | |
b6c395ed | 1714 | list_for_each_entry_safe(ctask, tmp, &conn->xmitqueue, running) { |
7996a778 MC |
1715 | debug_scsi("failing pending sc %p itt 0x%x\n", ctask->sc, |
1716 | ctask->itt); | |
1717 | fail_command(conn, ctask, DID_BUS_BUSY << 16); | |
1718 | } | |
1719 | ||
1720 | /* fail all other running */ | |
1721 | list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) { | |
1722 | debug_scsi("failing in progress sc %p itt 0x%x\n", | |
1723 | ctask->sc, ctask->itt); | |
1724 | fail_command(conn, ctask, DID_BUS_BUSY << 16); | |
1725 | } | |
1726 | ||
1727 | conn->ctask = NULL; | |
1728 | } | |
1729 | ||
656cffc9 MC |
1730 | static void iscsi_start_session_recovery(struct iscsi_session *session, |
1731 | struct iscsi_conn *conn, int flag) | |
7996a778 | 1732 | { |
ed2abc7f MC |
1733 | int old_stop_stage; |
1734 | ||
7996a778 | 1735 | spin_lock_bh(&session->lock); |
ed2abc7f | 1736 | if (conn->stop_stage == STOP_CONN_TERM) { |
7996a778 MC |
1737 | spin_unlock_bh(&session->lock); |
1738 | return; | |
1739 | } | |
ed2abc7f MC |
1740 | |
1741 | /* | |
1742 | * When this is called for the in_login state, we only want to clean | |
67a61114 MC |
1743 | * up the login task and connection. We do not need to block and set |
1744 | * the recovery state again | |
ed2abc7f | 1745 | */ |
67a61114 MC |
1746 | if (flag == STOP_CONN_TERM) |
1747 | session->state = ISCSI_STATE_TERMINATE; | |
1748 | else if (conn->stop_stage != STOP_CONN_RECOVER) | |
1749 | session->state = ISCSI_STATE_IN_RECOVERY; | |
ed2abc7f MC |
1750 | |
1751 | old_stop_stage = conn->stop_stage; | |
7996a778 | 1752 | conn->stop_stage = flag; |
67a61114 MC |
1753 | conn->c_stage = ISCSI_CONN_STOPPED; |
1754 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
7996a778 | 1755 | spin_unlock_bh(&session->lock); |
77a23c21 | 1756 | scsi_flush_work(session->host); |
7996a778 | 1757 | |
1c83469d MC |
1758 | write_lock_bh(conn->recv_lock); |
1759 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
1760 | write_unlock_bh(conn->recv_lock); | |
7996a778 | 1761 | |
7996a778 MC |
1762 | /* |
1763 | * for connection level recovery we should not calculate | |
1764 | * header digest. conn->hdr_size used for optimization | |
1765 | * in hdr_extract() and will be re-negotiated at | |
1766 | * set_param() time. | |
1767 | */ | |
1768 | if (flag == STOP_CONN_RECOVER) { | |
1769 | conn->hdrdgst_en = 0; | |
1770 | conn->datadgst_en = 0; | |
656cffc9 | 1771 | if (session->state == ISCSI_STATE_IN_RECOVERY && |
67a61114 MC |
1772 | old_stop_stage != STOP_CONN_RECOVER) { |
1773 | debug_scsi("blocking session\n"); | |
7996a778 | 1774 | iscsi_block_session(session_to_cls(session)); |
67a61114 | 1775 | } |
7996a778 | 1776 | } |
656cffc9 | 1777 | |
656cffc9 MC |
1778 | /* |
1779 | * flush queues. | |
1780 | */ | |
1781 | spin_lock_bh(&session->lock); | |
1782 | fail_all_commands(conn); | |
1783 | flush_control_queues(session, conn); | |
1784 | spin_unlock_bh(&session->lock); | |
7996a778 | 1785 | } |
7996a778 MC |
1786 | |
1787 | void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
1788 | { | |
1789 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1790 | struct iscsi_session *session = conn->session; | |
1791 | ||
1792 | switch (flag) { | |
1793 | case STOP_CONN_RECOVER: | |
1794 | case STOP_CONN_TERM: | |
1795 | iscsi_start_session_recovery(session, conn, flag); | |
8d2860b3 | 1796 | break; |
7996a778 | 1797 | default: |
be2df72e | 1798 | printk(KERN_ERR "iscsi: invalid stop flag %d\n", flag); |
7996a778 MC |
1799 | } |
1800 | } | |
1801 | EXPORT_SYMBOL_GPL(iscsi_conn_stop); | |
1802 | ||
1803 | int iscsi_conn_bind(struct iscsi_cls_session *cls_session, | |
1804 | struct iscsi_cls_conn *cls_conn, int is_leading) | |
1805 | { | |
1806 | struct iscsi_session *session = class_to_transport_session(cls_session); | |
98644047 | 1807 | struct iscsi_conn *conn = cls_conn->dd_data; |
7996a778 | 1808 | |
7996a778 | 1809 | spin_lock_bh(&session->lock); |
7996a778 MC |
1810 | if (is_leading) |
1811 | session->leadconn = conn; | |
98644047 | 1812 | spin_unlock_bh(&session->lock); |
7996a778 MC |
1813 | |
1814 | /* | |
1815 | * Unblock xmitworker(), Login Phase will pass through. | |
1816 | */ | |
1817 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
1818 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
1819 | return 0; | |
1820 | } | |
1821 | EXPORT_SYMBOL_GPL(iscsi_conn_bind); | |
1822 | ||
a54a52ca MC |
1823 | |
1824 | int iscsi_set_param(struct iscsi_cls_conn *cls_conn, | |
1825 | enum iscsi_param param, char *buf, int buflen) | |
1826 | { | |
1827 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1828 | struct iscsi_session *session = conn->session; | |
1829 | uint32_t value; | |
1830 | ||
1831 | switch(param) { | |
1832 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
1833 | sscanf(buf, "%d", &conn->max_recv_dlength); | |
1834 | break; | |
1835 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
1836 | sscanf(buf, "%d", &conn->max_xmit_dlength); | |
1837 | break; | |
1838 | case ISCSI_PARAM_HDRDGST_EN: | |
1839 | sscanf(buf, "%d", &conn->hdrdgst_en); | |
1840 | break; | |
1841 | case ISCSI_PARAM_DATADGST_EN: | |
1842 | sscanf(buf, "%d", &conn->datadgst_en); | |
1843 | break; | |
1844 | case ISCSI_PARAM_INITIAL_R2T_EN: | |
1845 | sscanf(buf, "%d", &session->initial_r2t_en); | |
1846 | break; | |
1847 | case ISCSI_PARAM_MAX_R2T: | |
1848 | sscanf(buf, "%d", &session->max_r2t); | |
1849 | break; | |
1850 | case ISCSI_PARAM_IMM_DATA_EN: | |
1851 | sscanf(buf, "%d", &session->imm_data_en); | |
1852 | break; | |
1853 | case ISCSI_PARAM_FIRST_BURST: | |
1854 | sscanf(buf, "%d", &session->first_burst); | |
1855 | break; | |
1856 | case ISCSI_PARAM_MAX_BURST: | |
1857 | sscanf(buf, "%d", &session->max_burst); | |
1858 | break; | |
1859 | case ISCSI_PARAM_PDU_INORDER_EN: | |
1860 | sscanf(buf, "%d", &session->pdu_inorder_en); | |
1861 | break; | |
1862 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
1863 | sscanf(buf, "%d", &session->dataseq_inorder_en); | |
1864 | break; | |
1865 | case ISCSI_PARAM_ERL: | |
1866 | sscanf(buf, "%d", &session->erl); | |
1867 | break; | |
1868 | case ISCSI_PARAM_IFMARKER_EN: | |
1869 | sscanf(buf, "%d", &value); | |
1870 | BUG_ON(value); | |
1871 | break; | |
1872 | case ISCSI_PARAM_OFMARKER_EN: | |
1873 | sscanf(buf, "%d", &value); | |
1874 | BUG_ON(value); | |
1875 | break; | |
1876 | case ISCSI_PARAM_EXP_STATSN: | |
1877 | sscanf(buf, "%u", &conn->exp_statsn); | |
1878 | break; | |
b2c64167 MC |
1879 | case ISCSI_PARAM_USERNAME: |
1880 | kfree(session->username); | |
1881 | session->username = kstrdup(buf, GFP_KERNEL); | |
1882 | if (!session->username) | |
1883 | return -ENOMEM; | |
1884 | break; | |
1885 | case ISCSI_PARAM_USERNAME_IN: | |
1886 | kfree(session->username_in); | |
1887 | session->username_in = kstrdup(buf, GFP_KERNEL); | |
1888 | if (!session->username_in) | |
1889 | return -ENOMEM; | |
1890 | break; | |
1891 | case ISCSI_PARAM_PASSWORD: | |
1892 | kfree(session->password); | |
1893 | session->password = kstrdup(buf, GFP_KERNEL); | |
1894 | if (!session->password) | |
1895 | return -ENOMEM; | |
1896 | break; | |
1897 | case ISCSI_PARAM_PASSWORD_IN: | |
1898 | kfree(session->password_in); | |
1899 | session->password_in = kstrdup(buf, GFP_KERNEL); | |
1900 | if (!session->password_in) | |
1901 | return -ENOMEM; | |
1902 | break; | |
a54a52ca MC |
1903 | case ISCSI_PARAM_TARGET_NAME: |
1904 | /* this should not change between logins */ | |
1905 | if (session->targetname) | |
1906 | break; | |
1907 | ||
1908 | session->targetname = kstrdup(buf, GFP_KERNEL); | |
1909 | if (!session->targetname) | |
1910 | return -ENOMEM; | |
1911 | break; | |
1912 | case ISCSI_PARAM_TPGT: | |
1913 | sscanf(buf, "%d", &session->tpgt); | |
1914 | break; | |
1915 | case ISCSI_PARAM_PERSISTENT_PORT: | |
1916 | sscanf(buf, "%d", &conn->persistent_port); | |
1917 | break; | |
1918 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
1919 | /* | |
1920 | * this is the address returned in discovery so it should | |
1921 | * not change between logins. | |
1922 | */ | |
1923 | if (conn->persistent_address) | |
1924 | break; | |
1925 | ||
1926 | conn->persistent_address = kstrdup(buf, GFP_KERNEL); | |
1927 | if (!conn->persistent_address) | |
1928 | return -ENOMEM; | |
1929 | break; | |
1930 | default: | |
1931 | return -ENOSYS; | |
1932 | } | |
1933 | ||
1934 | return 0; | |
1935 | } | |
1936 | EXPORT_SYMBOL_GPL(iscsi_set_param); | |
1937 | ||
1938 | int iscsi_session_get_param(struct iscsi_cls_session *cls_session, | |
1939 | enum iscsi_param param, char *buf) | |
1940 | { | |
1941 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); | |
1942 | struct iscsi_session *session = iscsi_hostdata(shost->hostdata); | |
1943 | int len; | |
1944 | ||
1945 | switch(param) { | |
1946 | case ISCSI_PARAM_INITIAL_R2T_EN: | |
1947 | len = sprintf(buf, "%d\n", session->initial_r2t_en); | |
1948 | break; | |
1949 | case ISCSI_PARAM_MAX_R2T: | |
1950 | len = sprintf(buf, "%hu\n", session->max_r2t); | |
1951 | break; | |
1952 | case ISCSI_PARAM_IMM_DATA_EN: | |
1953 | len = sprintf(buf, "%d\n", session->imm_data_en); | |
1954 | break; | |
1955 | case ISCSI_PARAM_FIRST_BURST: | |
1956 | len = sprintf(buf, "%u\n", session->first_burst); | |
1957 | break; | |
1958 | case ISCSI_PARAM_MAX_BURST: | |
1959 | len = sprintf(buf, "%u\n", session->max_burst); | |
1960 | break; | |
1961 | case ISCSI_PARAM_PDU_INORDER_EN: | |
1962 | len = sprintf(buf, "%d\n", session->pdu_inorder_en); | |
1963 | break; | |
1964 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
1965 | len = sprintf(buf, "%d\n", session->dataseq_inorder_en); | |
1966 | break; | |
1967 | case ISCSI_PARAM_ERL: | |
1968 | len = sprintf(buf, "%d\n", session->erl); | |
1969 | break; | |
1970 | case ISCSI_PARAM_TARGET_NAME: | |
1971 | len = sprintf(buf, "%s\n", session->targetname); | |
1972 | break; | |
1973 | case ISCSI_PARAM_TPGT: | |
1974 | len = sprintf(buf, "%d\n", session->tpgt); | |
1975 | break; | |
b2c64167 MC |
1976 | case ISCSI_PARAM_USERNAME: |
1977 | len = sprintf(buf, "%s\n", session->username); | |
1978 | break; | |
1979 | case ISCSI_PARAM_USERNAME_IN: | |
1980 | len = sprintf(buf, "%s\n", session->username_in); | |
1981 | break; | |
1982 | case ISCSI_PARAM_PASSWORD: | |
1983 | len = sprintf(buf, "%s\n", session->password); | |
1984 | break; | |
1985 | case ISCSI_PARAM_PASSWORD_IN: | |
1986 | len = sprintf(buf, "%s\n", session->password_in); | |
1987 | break; | |
a54a52ca MC |
1988 | default: |
1989 | return -ENOSYS; | |
1990 | } | |
1991 | ||
1992 | return len; | |
1993 | } | |
1994 | EXPORT_SYMBOL_GPL(iscsi_session_get_param); | |
1995 | ||
1996 | int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, | |
1997 | enum iscsi_param param, char *buf) | |
1998 | { | |
1999 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2000 | int len; | |
2001 | ||
2002 | switch(param) { | |
2003 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
2004 | len = sprintf(buf, "%u\n", conn->max_recv_dlength); | |
2005 | break; | |
2006 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
2007 | len = sprintf(buf, "%u\n", conn->max_xmit_dlength); | |
2008 | break; | |
2009 | case ISCSI_PARAM_HDRDGST_EN: | |
2010 | len = sprintf(buf, "%d\n", conn->hdrdgst_en); | |
2011 | break; | |
2012 | case ISCSI_PARAM_DATADGST_EN: | |
2013 | len = sprintf(buf, "%d\n", conn->datadgst_en); | |
2014 | break; | |
2015 | case ISCSI_PARAM_IFMARKER_EN: | |
2016 | len = sprintf(buf, "%d\n", conn->ifmarker_en); | |
2017 | break; | |
2018 | case ISCSI_PARAM_OFMARKER_EN: | |
2019 | len = sprintf(buf, "%d\n", conn->ofmarker_en); | |
2020 | break; | |
2021 | case ISCSI_PARAM_EXP_STATSN: | |
2022 | len = sprintf(buf, "%u\n", conn->exp_statsn); | |
2023 | break; | |
2024 | case ISCSI_PARAM_PERSISTENT_PORT: | |
2025 | len = sprintf(buf, "%d\n", conn->persistent_port); | |
2026 | break; | |
2027 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
2028 | len = sprintf(buf, "%s\n", conn->persistent_address); | |
2029 | break; | |
2030 | default: | |
2031 | return -ENOSYS; | |
2032 | } | |
2033 | ||
2034 | return len; | |
2035 | } | |
2036 | EXPORT_SYMBOL_GPL(iscsi_conn_get_param); | |
2037 | ||
0801c242 MC |
2038 | int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param, |
2039 | char *buf) | |
2040 | { | |
2041 | struct iscsi_session *session = iscsi_hostdata(shost->hostdata); | |
2042 | int len; | |
2043 | ||
2044 | switch (param) { | |
d8196ed2 MC |
2045 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
2046 | if (!session->netdev) | |
2047 | len = sprintf(buf, "%s\n", "default"); | |
2048 | else | |
2049 | len = sprintf(buf, "%s\n", session->netdev); | |
2050 | break; | |
0801c242 MC |
2051 | case ISCSI_HOST_PARAM_HWADDRESS: |
2052 | if (!session->hwaddress) | |
2053 | len = sprintf(buf, "%s\n", "default"); | |
2054 | else | |
2055 | len = sprintf(buf, "%s\n", session->hwaddress); | |
2056 | break; | |
8ad5781a MC |
2057 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
2058 | if (!session->initiatorname) | |
2059 | len = sprintf(buf, "%s\n", "unknown"); | |
2060 | else | |
2061 | len = sprintf(buf, "%s\n", session->initiatorname); | |
2062 | break; | |
2063 | ||
0801c242 MC |
2064 | default: |
2065 | return -ENOSYS; | |
2066 | } | |
2067 | ||
2068 | return len; | |
2069 | } | |
2070 | EXPORT_SYMBOL_GPL(iscsi_host_get_param); | |
2071 | ||
2072 | int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param, | |
2073 | char *buf, int buflen) | |
2074 | { | |
2075 | struct iscsi_session *session = iscsi_hostdata(shost->hostdata); | |
2076 | ||
2077 | switch (param) { | |
d8196ed2 MC |
2078 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
2079 | if (!session->netdev) | |
2080 | session->netdev = kstrdup(buf, GFP_KERNEL); | |
2081 | break; | |
0801c242 MC |
2082 | case ISCSI_HOST_PARAM_HWADDRESS: |
2083 | if (!session->hwaddress) | |
2084 | session->hwaddress = kstrdup(buf, GFP_KERNEL); | |
2085 | break; | |
8ad5781a MC |
2086 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
2087 | if (!session->initiatorname) | |
2088 | session->initiatorname = kstrdup(buf, GFP_KERNEL); | |
2089 | break; | |
0801c242 MC |
2090 | default: |
2091 | return -ENOSYS; | |
2092 | } | |
2093 | ||
2094 | return 0; | |
2095 | } | |
2096 | EXPORT_SYMBOL_GPL(iscsi_host_set_param); | |
2097 | ||
7996a778 MC |
2098 | MODULE_AUTHOR("Mike Christie"); |
2099 | MODULE_DESCRIPTION("iSCSI library functions"); | |
2100 | MODULE_LICENSE("GPL"); |