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7996a778 MC |
1 | /* |
2 | * iSCSI lib functions | |
3 | * | |
4 | * Copyright (C) 2006 Red Hat, Inc. All rights reserved. | |
5 | * Copyright (C) 2004 - 2006 Mike Christie | |
6 | * Copyright (C) 2004 - 2005 Dmitry Yusupov | |
7 | * Copyright (C) 2004 - 2005 Alex Aizman | |
8 | * maintained by open-iscsi@googlegroups.com | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
23 | */ | |
24 | #include <linux/types.h> | |
7996a778 MC |
25 | #include <linux/kfifo.h> |
26 | #include <linux/delay.h> | |
11836572 | 27 | #include <linux/log2.h> |
8eb00539 | 28 | #include <asm/unaligned.h> |
7996a778 MC |
29 | #include <net/tcp.h> |
30 | #include <scsi/scsi_cmnd.h> | |
31 | #include <scsi/scsi_device.h> | |
32 | #include <scsi/scsi_eh.h> | |
33 | #include <scsi/scsi_tcq.h> | |
34 | #include <scsi/scsi_host.h> | |
35 | #include <scsi/scsi.h> | |
36 | #include <scsi/iscsi_proto.h> | |
37 | #include <scsi/scsi_transport.h> | |
38 | #include <scsi/scsi_transport_iscsi.h> | |
39 | #include <scsi/libiscsi.h> | |
40 | ||
77a23c21 MC |
41 | /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */ |
42 | #define SNA32_CHECK 2147483648UL | |
7996a778 | 43 | |
77a23c21 MC |
44 | static int iscsi_sna_lt(u32 n1, u32 n2) |
45 | { | |
46 | return n1 != n2 && ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) || | |
47 | (n1 > n2 && (n2 - n1 < SNA32_CHECK))); | |
48 | } | |
49 | ||
50 | /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */ | |
51 | static int iscsi_sna_lte(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 | void | |
58 | iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr) | |
7996a778 MC |
59 | { |
60 | uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn); | |
61 | uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn); | |
62 | ||
77a23c21 MC |
63 | /* |
64 | * standard specifies this check for when to update expected and | |
65 | * max sequence numbers | |
66 | */ | |
67 | if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1)) | |
68 | return; | |
69 | ||
70 | if (exp_cmdsn != session->exp_cmdsn && | |
71 | !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn)) | |
7996a778 MC |
72 | session->exp_cmdsn = exp_cmdsn; |
73 | ||
77a23c21 MC |
74 | if (max_cmdsn != session->max_cmdsn && |
75 | !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) { | |
76 | session->max_cmdsn = max_cmdsn; | |
77 | /* | |
78 | * if the window closed with IO queued, then kick the | |
79 | * xmit thread | |
80 | */ | |
81 | if (!list_empty(&session->leadconn->xmitqueue) || | |
052d0144 MC |
82 | !list_empty(&session->leadconn->mgmtqueue)) { |
83 | if (!(session->tt->caps & CAP_DATA_PATH_OFFLOAD)) | |
84 | scsi_queue_work(session->host, | |
85 | &session->leadconn->xmitwork); | |
86 | } | |
77a23c21 | 87 | } |
7996a778 | 88 | } |
77a23c21 | 89 | EXPORT_SYMBOL_GPL(iscsi_update_cmdsn); |
7996a778 | 90 | |
577577da MC |
91 | /** |
92 | * iscsi_prep_data_out_pdu - initialize Data-Out | |
93 | * @task: scsi command task | |
94 | * @r2t: R2T info | |
95 | * @hdr: iscsi data in pdu | |
96 | * | |
97 | * Notes: | |
98 | * Initialize Data-Out within this R2T sequence and finds | |
99 | * proper data_offset within this SCSI command. | |
100 | * | |
101 | * This function is called with connection lock taken. | |
102 | **/ | |
103 | void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t, | |
104 | struct iscsi_data *hdr) | |
7996a778 | 105 | { |
9c19a7d0 | 106 | struct iscsi_conn *conn = task->conn; |
577577da MC |
107 | unsigned int left = r2t->data_length - r2t->sent; |
108 | ||
109 | task->hdr_len = sizeof(struct iscsi_data); | |
7996a778 MC |
110 | |
111 | memset(hdr, 0, sizeof(struct iscsi_data)); | |
577577da MC |
112 | hdr->ttt = r2t->ttt; |
113 | hdr->datasn = cpu_to_be32(r2t->datasn); | |
114 | r2t->datasn++; | |
7996a778 | 115 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; |
577577da MC |
116 | memcpy(hdr->lun, task->lun, sizeof(hdr->lun)); |
117 | hdr->itt = task->hdr_itt; | |
118 | hdr->exp_statsn = r2t->exp_statsn; | |
119 | hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent); | |
120 | if (left > conn->max_xmit_dlength) { | |
7996a778 | 121 | hton24(hdr->dlength, conn->max_xmit_dlength); |
577577da | 122 | r2t->data_count = conn->max_xmit_dlength; |
7996a778 MC |
123 | hdr->flags = 0; |
124 | } else { | |
577577da MC |
125 | hton24(hdr->dlength, left); |
126 | r2t->data_count = left; | |
7996a778 MC |
127 | hdr->flags = ISCSI_FLAG_CMD_FINAL; |
128 | } | |
577577da | 129 | conn->dataout_pdus_cnt++; |
7996a778 | 130 | } |
577577da | 131 | EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu); |
7996a778 | 132 | |
9c19a7d0 | 133 | static int iscsi_add_hdr(struct iscsi_task *task, unsigned len) |
004d6530 | 134 | { |
9c19a7d0 | 135 | unsigned exp_len = task->hdr_len + len; |
004d6530 | 136 | |
9c19a7d0 | 137 | if (exp_len > task->hdr_max) { |
004d6530 BH |
138 | WARN_ON(1); |
139 | return -EINVAL; | |
140 | } | |
141 | ||
142 | WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */ | |
9c19a7d0 | 143 | task->hdr_len = exp_len; |
004d6530 BH |
144 | return 0; |
145 | } | |
146 | ||
38d1c069 BH |
147 | /* |
148 | * make an extended cdb AHS | |
149 | */ | |
9c19a7d0 | 150 | static int iscsi_prep_ecdb_ahs(struct iscsi_task *task) |
38d1c069 | 151 | { |
9c19a7d0 | 152 | struct scsi_cmnd *cmd = task->sc; |
38d1c069 BH |
153 | unsigned rlen, pad_len; |
154 | unsigned short ahslength; | |
155 | struct iscsi_ecdb_ahdr *ecdb_ahdr; | |
156 | int rc; | |
157 | ||
9c19a7d0 | 158 | ecdb_ahdr = iscsi_next_hdr(task); |
38d1c069 BH |
159 | rlen = cmd->cmd_len - ISCSI_CDB_SIZE; |
160 | ||
161 | BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb)); | |
162 | ahslength = rlen + sizeof(ecdb_ahdr->reserved); | |
163 | ||
164 | pad_len = iscsi_padding(rlen); | |
165 | ||
9c19a7d0 | 166 | rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) + |
38d1c069 BH |
167 | sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len); |
168 | if (rc) | |
169 | return rc; | |
170 | ||
171 | if (pad_len) | |
172 | memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len); | |
173 | ||
174 | ecdb_ahdr->ahslength = cpu_to_be16(ahslength); | |
175 | ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB; | |
176 | ecdb_ahdr->reserved = 0; | |
177 | memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen); | |
178 | ||
179 | debug_scsi("iscsi_prep_ecdb_ahs: varlen_cdb_len %d " | |
180 | "rlen %d pad_len %d ahs_length %d iscsi_headers_size %u\n", | |
9c19a7d0 | 181 | cmd->cmd_len, rlen, pad_len, ahslength, task->hdr_len); |
38d1c069 BH |
182 | |
183 | return 0; | |
184 | } | |
185 | ||
9c19a7d0 | 186 | static int iscsi_prep_bidi_ahs(struct iscsi_task *task) |
c07d4444 | 187 | { |
9c19a7d0 | 188 | struct scsi_cmnd *sc = task->sc; |
c07d4444 BH |
189 | struct iscsi_rlength_ahdr *rlen_ahdr; |
190 | int rc; | |
191 | ||
9c19a7d0 MC |
192 | rlen_ahdr = iscsi_next_hdr(task); |
193 | rc = iscsi_add_hdr(task, sizeof(*rlen_ahdr)); | |
c07d4444 BH |
194 | if (rc) |
195 | return rc; | |
196 | ||
197 | rlen_ahdr->ahslength = | |
198 | cpu_to_be16(sizeof(rlen_ahdr->read_length) + | |
199 | sizeof(rlen_ahdr->reserved)); | |
200 | rlen_ahdr->ahstype = ISCSI_AHSTYPE_RLENGTH; | |
201 | rlen_ahdr->reserved = 0; | |
202 | rlen_ahdr->read_length = cpu_to_be32(scsi_in(sc)->length); | |
203 | ||
204 | debug_scsi("bidi-in rlen_ahdr->read_length(%d) " | |
205 | "rlen_ahdr->ahslength(%d)\n", | |
206 | be32_to_cpu(rlen_ahdr->read_length), | |
207 | be16_to_cpu(rlen_ahdr->ahslength)); | |
208 | return 0; | |
209 | } | |
210 | ||
7996a778 MC |
211 | /** |
212 | * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu | |
9c19a7d0 | 213 | * @task: iscsi task |
7996a778 MC |
214 | * |
215 | * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set | |
216 | * fields like dlength or final based on how much data it sends | |
217 | */ | |
9c19a7d0 | 218 | static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task) |
7996a778 | 219 | { |
9c19a7d0 | 220 | struct iscsi_conn *conn = task->conn; |
7996a778 | 221 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 222 | struct scsi_cmnd *sc = task->sc; |
577577da | 223 | struct iscsi_cmd *hdr; |
38d1c069 | 224 | unsigned hdrlength, cmd_len; |
004d6530 | 225 | int rc; |
7996a778 | 226 | |
577577da MC |
227 | rc = conn->session->tt->alloc_pdu(task); |
228 | if (rc) | |
229 | return rc; | |
230 | hdr = (struct iscsi_cmd *) task->hdr; | |
231 | memset(hdr, 0, sizeof(*hdr)); | |
232 | ||
9c19a7d0 MC |
233 | task->hdr_len = 0; |
234 | rc = iscsi_add_hdr(task, sizeof(*hdr)); | |
004d6530 BH |
235 | if (rc) |
236 | return rc; | |
a8ac6311 OK |
237 | hdr->opcode = ISCSI_OP_SCSI_CMD; |
238 | hdr->flags = ISCSI_ATTR_SIMPLE; | |
239 | int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun); | |
577577da MC |
240 | memcpy(task->lun, hdr->lun, sizeof(task->lun)); |
241 | hdr->itt = task->hdr_itt = build_itt(task->itt, session->age); | |
242 | hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn); | |
a8ac6311 OK |
243 | session->cmdsn++; |
244 | hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
38d1c069 BH |
245 | cmd_len = sc->cmd_len; |
246 | if (cmd_len < ISCSI_CDB_SIZE) | |
247 | memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len); | |
248 | else if (cmd_len > ISCSI_CDB_SIZE) { | |
9c19a7d0 | 249 | rc = iscsi_prep_ecdb_ahs(task); |
38d1c069 BH |
250 | if (rc) |
251 | return rc; | |
252 | cmd_len = ISCSI_CDB_SIZE; | |
253 | } | |
254 | memcpy(hdr->cdb, sc->cmnd, cmd_len); | |
7996a778 | 255 | |
9c19a7d0 | 256 | task->imm_count = 0; |
c07d4444 BH |
257 | if (scsi_bidi_cmnd(sc)) { |
258 | hdr->flags |= ISCSI_FLAG_CMD_READ; | |
9c19a7d0 | 259 | rc = iscsi_prep_bidi_ahs(task); |
c07d4444 BH |
260 | if (rc) |
261 | return rc; | |
262 | } | |
7996a778 | 263 | if (sc->sc_data_direction == DMA_TO_DEVICE) { |
c07d4444 | 264 | unsigned out_len = scsi_out(sc)->length; |
577577da MC |
265 | struct iscsi_r2t_info *r2t = &task->unsol_r2t; |
266 | ||
c07d4444 | 267 | hdr->data_length = cpu_to_be32(out_len); |
7996a778 MC |
268 | hdr->flags |= ISCSI_FLAG_CMD_WRITE; |
269 | /* | |
270 | * Write counters: | |
271 | * | |
272 | * imm_count bytes to be sent right after | |
273 | * SCSI PDU Header | |
274 | * | |
275 | * unsol_count bytes(as Data-Out) to be sent | |
276 | * without R2T ack right after | |
277 | * immediate data | |
278 | * | |
577577da | 279 | * r2t data_length bytes to be sent via R2T ack's |
7996a778 MC |
280 | * |
281 | * pad_count bytes to be sent as zero-padding | |
282 | */ | |
577577da | 283 | memset(r2t, 0, sizeof(*r2t)); |
7996a778 MC |
284 | |
285 | if (session->imm_data_en) { | |
c07d4444 | 286 | if (out_len >= session->first_burst) |
9c19a7d0 | 287 | task->imm_count = min(session->first_burst, |
7996a778 MC |
288 | conn->max_xmit_dlength); |
289 | else | |
9c19a7d0 | 290 | task->imm_count = min(out_len, |
7996a778 | 291 | conn->max_xmit_dlength); |
9c19a7d0 | 292 | hton24(hdr->dlength, task->imm_count); |
7996a778 | 293 | } else |
a8ac6311 | 294 | zero_data(hdr->dlength); |
7996a778 | 295 | |
ffd0436e | 296 | if (!session->initial_r2t_en) { |
577577da MC |
297 | r2t->data_length = min(session->first_burst, out_len) - |
298 | task->imm_count; | |
299 | r2t->data_offset = task->imm_count; | |
300 | r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); | |
301 | r2t->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
ffd0436e MC |
302 | } |
303 | ||
577577da | 304 | if (!task->unsol_r2t.data_length) |
7996a778 | 305 | /* No unsolicit Data-Out's */ |
a8ac6311 | 306 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
7996a778 | 307 | } else { |
7996a778 MC |
308 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
309 | zero_data(hdr->dlength); | |
c07d4444 | 310 | hdr->data_length = cpu_to_be32(scsi_in(sc)->length); |
7996a778 MC |
311 | |
312 | if (sc->sc_data_direction == DMA_FROM_DEVICE) | |
313 | hdr->flags |= ISCSI_FLAG_CMD_READ; | |
314 | } | |
315 | ||
004d6530 | 316 | /* calculate size of additional header segments (AHSs) */ |
9c19a7d0 | 317 | hdrlength = task->hdr_len - sizeof(*hdr); |
004d6530 BH |
318 | |
319 | WARN_ON(hdrlength & (ISCSI_PAD_LEN-1)); | |
320 | hdrlength /= ISCSI_PAD_LEN; | |
321 | ||
322 | WARN_ON(hdrlength >= 256); | |
323 | hdr->hlength = hdrlength & 0xFF; | |
324 | ||
577577da | 325 | if (session->tt->init_task && session->tt->init_task(task)) |
052d0144 MC |
326 | return -EIO; |
327 | ||
9c19a7d0 MC |
328 | task->state = ISCSI_TASK_RUNNING; |
329 | list_move_tail(&task->running, &conn->run_list); | |
77a23c21 | 330 | |
a8ac6311 | 331 | conn->scsicmd_pdus_cnt++; |
3e5c28ad MC |
332 | debug_scsi("iscsi prep [%s cid %d sc %p cdb 0x%x itt 0x%x len %d " |
333 | "bidi_len %d cmdsn %d win %d]\n", scsi_bidi_cmnd(sc) ? | |
334 | "bidirectional" : sc->sc_data_direction == DMA_TO_DEVICE ? | |
9c19a7d0 | 335 | "write" : "read", conn->id, sc, sc->cmnd[0], task->itt, |
3e5c28ad MC |
336 | scsi_bufflen(sc), |
337 | scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0, | |
338 | session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1); | |
004d6530 | 339 | return 0; |
7996a778 | 340 | } |
7996a778 MC |
341 | |
342 | /** | |
3e5c28ad | 343 | * iscsi_complete_command - finish a task |
9c19a7d0 | 344 | * @task: iscsi cmd task |
7996a778 MC |
345 | * |
346 | * Must be called with session lock. | |
3e5c28ad MC |
347 | * This function returns the scsi command to scsi-ml or cleans |
348 | * up mgmt tasks then returns the task to the pool. | |
7996a778 | 349 | */ |
9c19a7d0 | 350 | static void iscsi_complete_command(struct iscsi_task *task) |
7996a778 | 351 | { |
9c19a7d0 | 352 | struct iscsi_conn *conn = task->conn; |
c1635cb7 | 353 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 354 | struct scsi_cmnd *sc = task->sc; |
7996a778 | 355 | |
577577da | 356 | session->tt->cleanup_task(task); |
9c19a7d0 MC |
357 | list_del_init(&task->running); |
358 | task->state = ISCSI_TASK_COMPLETED; | |
359 | task->sc = NULL; | |
3e5c28ad | 360 | |
9c19a7d0 MC |
361 | if (conn->task == task) |
362 | conn->task = NULL; | |
3e5c28ad | 363 | /* |
9c19a7d0 | 364 | * login task is preallocated so do not free |
3e5c28ad | 365 | */ |
9c19a7d0 | 366 | if (conn->login_task == task) |
3e5c28ad MC |
367 | return; |
368 | ||
9c19a7d0 | 369 | __kfifo_put(session->cmdpool.queue, (void*)&task, sizeof(void*)); |
052d0144 | 370 | |
9c19a7d0 MC |
371 | if (conn->ping_task == task) |
372 | conn->ping_task = NULL; | |
3e5c28ad MC |
373 | |
374 | if (sc) { | |
9c19a7d0 | 375 | task->sc = NULL; |
3e5c28ad MC |
376 | /* SCSI eh reuses commands to verify us */ |
377 | sc->SCp.ptr = NULL; | |
378 | /* | |
379 | * queue command may call this to free the task, but | |
380 | * not have setup the sc callback | |
381 | */ | |
382 | if (sc->scsi_done) | |
383 | sc->scsi_done(sc); | |
384 | } | |
7996a778 MC |
385 | } |
386 | ||
913e5bf4 | 387 | void __iscsi_get_task(struct iscsi_task *task) |
60ecebf5 | 388 | { |
9c19a7d0 | 389 | atomic_inc(&task->refcount); |
60ecebf5 | 390 | } |
913e5bf4 | 391 | EXPORT_SYMBOL_GPL(__iscsi_get_task); |
60ecebf5 | 392 | |
9c19a7d0 | 393 | static void __iscsi_put_task(struct iscsi_task *task) |
60ecebf5 | 394 | { |
9c19a7d0 MC |
395 | if (atomic_dec_and_test(&task->refcount)) |
396 | iscsi_complete_command(task); | |
60ecebf5 MC |
397 | } |
398 | ||
9c19a7d0 | 399 | void iscsi_put_task(struct iscsi_task *task) |
3e5c28ad | 400 | { |
9c19a7d0 | 401 | struct iscsi_session *session = task->conn->session; |
3e5c28ad MC |
402 | |
403 | spin_lock_bh(&session->lock); | |
9c19a7d0 | 404 | __iscsi_put_task(task); |
3e5c28ad MC |
405 | spin_unlock_bh(&session->lock); |
406 | } | |
9c19a7d0 | 407 | EXPORT_SYMBOL_GPL(iscsi_put_task); |
3e5c28ad | 408 | |
b3a7ea8d MC |
409 | /* |
410 | * session lock must be held | |
411 | */ | |
9c19a7d0 | 412 | static void fail_command(struct iscsi_conn *conn, struct iscsi_task *task, |
b3a7ea8d MC |
413 | int err) |
414 | { | |
415 | struct scsi_cmnd *sc; | |
416 | ||
9c19a7d0 | 417 | sc = task->sc; |
b3a7ea8d MC |
418 | if (!sc) |
419 | return; | |
420 | ||
9c19a7d0 | 421 | if (task->state == ISCSI_TASK_PENDING) |
b3a7ea8d MC |
422 | /* |
423 | * cmd never made it to the xmit thread, so we should not count | |
424 | * the cmd in the sequencing | |
425 | */ | |
426 | conn->session->queued_cmdsn--; | |
b3a7ea8d MC |
427 | |
428 | sc->result = err; | |
c07d4444 BH |
429 | if (!scsi_bidi_cmnd(sc)) |
430 | scsi_set_resid(sc, scsi_bufflen(sc)); | |
431 | else { | |
432 | scsi_out(sc)->resid = scsi_out(sc)->length; | |
433 | scsi_in(sc)->resid = scsi_in(sc)->length; | |
434 | } | |
3e5c28ad | 435 | |
9c19a7d0 MC |
436 | if (conn->task == task) |
437 | conn->task = NULL; | |
b3a7ea8d | 438 | /* release ref from queuecommand */ |
9c19a7d0 | 439 | __iscsi_put_task(task); |
b3a7ea8d MC |
440 | } |
441 | ||
3e5c28ad | 442 | static int iscsi_prep_mgmt_task(struct iscsi_conn *conn, |
9c19a7d0 | 443 | struct iscsi_task *task) |
052d0144 MC |
444 | { |
445 | struct iscsi_session *session = conn->session; | |
577577da | 446 | struct iscsi_hdr *hdr = task->hdr; |
052d0144 MC |
447 | struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; |
448 | ||
449 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) | |
450 | return -ENOTCONN; | |
451 | ||
452 | if (hdr->opcode != (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) && | |
453 | hdr->opcode != (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE)) | |
454 | nop->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
455 | /* | |
456 | * pre-format CmdSN for outgoing PDU. | |
457 | */ | |
458 | nop->cmdsn = cpu_to_be32(session->cmdsn); | |
459 | if (hdr->itt != RESERVED_ITT) { | |
9c19a7d0 | 460 | hdr->itt = build_itt(task->itt, session->age); |
052d0144 MC |
461 | /* |
462 | * TODO: We always use immediate, so we never hit this. | |
463 | * If we start to send tmfs or nops as non-immediate then | |
464 | * we should start checking the cmdsn numbers for mgmt tasks. | |
465 | */ | |
466 | if (conn->c_stage == ISCSI_CONN_STARTED && | |
467 | !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { | |
468 | session->queued_cmdsn++; | |
469 | session->cmdsn++; | |
470 | } | |
471 | } | |
472 | ||
3e5c28ad | 473 | if (session->tt->init_task) |
9c19a7d0 | 474 | session->tt->init_task(task); |
052d0144 MC |
475 | |
476 | if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) | |
477 | session->state = ISCSI_STATE_LOGGING_OUT; | |
478 | ||
577577da | 479 | task->state = ISCSI_TASK_RUNNING; |
9c19a7d0 | 480 | list_move_tail(&task->running, &conn->mgmt_run_list); |
052d0144 MC |
481 | debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n", |
482 | hdr->opcode & ISCSI_OPCODE_MASK, hdr->itt, | |
9c19a7d0 | 483 | task->data_count); |
052d0144 MC |
484 | return 0; |
485 | } | |
486 | ||
9c19a7d0 | 487 | static struct iscsi_task * |
f6d5180c MC |
488 | __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
489 | char *data, uint32_t data_size) | |
490 | { | |
491 | struct iscsi_session *session = conn->session; | |
9c19a7d0 | 492 | struct iscsi_task *task; |
f6d5180c MC |
493 | |
494 | if (session->state == ISCSI_STATE_TERMINATE) | |
495 | return NULL; | |
496 | ||
497 | if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) || | |
498 | hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE)) | |
499 | /* | |
500 | * Login and Text are sent serially, in | |
501 | * request-followed-by-response sequence. | |
3e5c28ad MC |
502 | * Same task can be used. Same ITT must be used. |
503 | * Note that login_task is preallocated at conn_create(). | |
f6d5180c | 504 | */ |
9c19a7d0 | 505 | task = conn->login_task; |
f6d5180c MC |
506 | else { |
507 | BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); | |
508 | BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); | |
509 | ||
3e5c28ad | 510 | if (!__kfifo_get(session->cmdpool.queue, |
9c19a7d0 | 511 | (void*)&task, sizeof(void*))) |
f6d5180c MC |
512 | return NULL; |
513 | } | |
3e5c28ad MC |
514 | /* |
515 | * released in complete pdu for task we expect a response for, and | |
516 | * released by the lld when it has transmitted the task for | |
517 | * pdus we do not expect a response for. | |
518 | */ | |
9c19a7d0 MC |
519 | atomic_set(&task->refcount, 1); |
520 | task->conn = conn; | |
521 | task->sc = NULL; | |
f6d5180c MC |
522 | |
523 | if (data_size) { | |
9c19a7d0 MC |
524 | memcpy(task->data, data, data_size); |
525 | task->data_count = data_size; | |
f6d5180c | 526 | } else |
9c19a7d0 | 527 | task->data_count = 0; |
f6d5180c | 528 | |
577577da MC |
529 | if (conn->session->tt->alloc_pdu(task)) { |
530 | iscsi_conn_printk(KERN_ERR, conn, "Could not allocate " | |
531 | "pdu for mgmt task.\n"); | |
532 | goto requeue_task; | |
533 | } | |
534 | task->hdr_len = sizeof(struct iscsi_hdr); | |
535 | ||
9c19a7d0 MC |
536 | memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr)); |
537 | INIT_LIST_HEAD(&task->running); | |
538 | list_add_tail(&task->running, &conn->mgmtqueue); | |
052d0144 MC |
539 | |
540 | if (session->tt->caps & CAP_DATA_PATH_OFFLOAD) { | |
577577da MC |
541 | if (iscsi_prep_mgmt_task(conn, task)) |
542 | goto free_task; | |
052d0144 | 543 | |
9c19a7d0 | 544 | if (session->tt->xmit_task(task)) |
577577da | 545 | goto free_task; |
052d0144 MC |
546 | |
547 | } else | |
548 | scsi_queue_work(conn->session->host, &conn->xmitwork); | |
549 | ||
9c19a7d0 | 550 | return task; |
577577da MC |
551 | |
552 | free_task: | |
553 | __iscsi_put_task(task); | |
554 | return NULL; | |
555 | ||
556 | requeue_task: | |
557 | if (task != conn->login_task) | |
558 | __kfifo_put(session->cmdpool.queue, (void*)&task, | |
559 | sizeof(void*)); | |
560 | return NULL; | |
f6d5180c MC |
561 | } |
562 | ||
563 | int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, | |
564 | char *data, uint32_t data_size) | |
565 | { | |
566 | struct iscsi_conn *conn = cls_conn->dd_data; | |
567 | struct iscsi_session *session = conn->session; | |
568 | int err = 0; | |
569 | ||
570 | spin_lock_bh(&session->lock); | |
571 | if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size)) | |
572 | err = -EPERM; | |
573 | spin_unlock_bh(&session->lock); | |
f6d5180c MC |
574 | return err; |
575 | } | |
576 | EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); | |
577 | ||
7996a778 MC |
578 | /** |
579 | * iscsi_cmd_rsp - SCSI Command Response processing | |
580 | * @conn: iscsi connection | |
581 | * @hdr: iscsi header | |
9c19a7d0 | 582 | * @task: scsi command task |
7996a778 MC |
583 | * @data: cmd data buffer |
584 | * @datalen: len of buffer | |
585 | * | |
586 | * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and | |
9c19a7d0 | 587 | * then completes the command and task. |
7996a778 | 588 | **/ |
77a23c21 | 589 | static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
9c19a7d0 | 590 | struct iscsi_task *task, char *data, |
77a23c21 | 591 | int datalen) |
7996a778 | 592 | { |
7996a778 MC |
593 | struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr; |
594 | struct iscsi_session *session = conn->session; | |
9c19a7d0 | 595 | struct scsi_cmnd *sc = task->sc; |
7996a778 | 596 | |
77a23c21 | 597 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); |
7996a778 MC |
598 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; |
599 | ||
600 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
601 | ||
602 | if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { | |
603 | sc->result = DID_ERROR << 16; | |
604 | goto out; | |
605 | } | |
606 | ||
607 | if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) { | |
9b80cb4b | 608 | uint16_t senselen; |
7996a778 MC |
609 | |
610 | if (datalen < 2) { | |
611 | invalid_datalen: | |
322d739d MC |
612 | iscsi_conn_printk(KERN_ERR, conn, |
613 | "Got CHECK_CONDITION but invalid data " | |
614 | "buffer size of %d\n", datalen); | |
7996a778 MC |
615 | sc->result = DID_BAD_TARGET << 16; |
616 | goto out; | |
617 | } | |
618 | ||
8f333991 | 619 | senselen = get_unaligned_be16(data); |
7996a778 MC |
620 | if (datalen < senselen) |
621 | goto invalid_datalen; | |
622 | ||
623 | memcpy(sc->sense_buffer, data + 2, | |
9b80cb4b | 624 | min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); |
7996a778 | 625 | debug_scsi("copied %d bytes of sense\n", |
8eb00539 | 626 | min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); |
7996a778 MC |
627 | } |
628 | ||
c07d4444 BH |
629 | if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW | |
630 | ISCSI_FLAG_CMD_BIDI_OVERFLOW)) { | |
631 | int res_count = be32_to_cpu(rhdr->bi_residual_count); | |
632 | ||
633 | if (scsi_bidi_cmnd(sc) && res_count > 0 && | |
634 | (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW || | |
635 | res_count <= scsi_in(sc)->length)) | |
636 | scsi_in(sc)->resid = res_count; | |
637 | else | |
638 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
639 | } | |
640 | ||
7207fea4 BH |
641 | if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW | |
642 | ISCSI_FLAG_CMD_OVERFLOW)) { | |
7996a778 MC |
643 | int res_count = be32_to_cpu(rhdr->residual_count); |
644 | ||
7207fea4 BH |
645 | if (res_count > 0 && |
646 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
647 | res_count <= scsi_bufflen(sc))) | |
c07d4444 | 648 | /* write side for bidi or uni-io set_resid */ |
1c138991 | 649 | scsi_set_resid(sc, res_count); |
7996a778 MC |
650 | else |
651 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
c07d4444 | 652 | } |
7996a778 MC |
653 | out: |
654 | debug_scsi("done [sc %lx res %d itt 0x%x]\n", | |
9c19a7d0 | 655 | (long)sc, sc->result, task->itt); |
7996a778 MC |
656 | conn->scsirsp_pdus_cnt++; |
657 | ||
9c19a7d0 | 658 | __iscsi_put_task(task); |
7996a778 MC |
659 | } |
660 | ||
1d9edf02 MC |
661 | /** |
662 | * iscsi_data_in_rsp - SCSI Data-In Response processing | |
663 | * @conn: iscsi connection | |
664 | * @hdr: iscsi pdu | |
665 | * @task: scsi command task | |
666 | **/ | |
667 | static void | |
668 | iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
669 | struct iscsi_task *task) | |
670 | { | |
671 | struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr; | |
672 | struct scsi_cmnd *sc = task->sc; | |
673 | ||
674 | if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS)) | |
675 | return; | |
676 | ||
677 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
678 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; | |
679 | if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW | | |
680 | ISCSI_FLAG_DATA_OVERFLOW)) { | |
681 | int res_count = be32_to_cpu(rhdr->residual_count); | |
682 | ||
683 | if (res_count > 0 && | |
684 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
685 | res_count <= scsi_in(sc)->length)) | |
686 | scsi_in(sc)->resid = res_count; | |
687 | else | |
688 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
689 | } | |
690 | ||
691 | conn->scsirsp_pdus_cnt++; | |
692 | __iscsi_put_task(task); | |
693 | } | |
694 | ||
7ea8b828 MC |
695 | static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) |
696 | { | |
697 | struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr; | |
698 | ||
699 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
700 | conn->tmfrsp_pdus_cnt++; | |
701 | ||
843c0a8a | 702 | if (conn->tmf_state != TMF_QUEUED) |
7ea8b828 MC |
703 | return; |
704 | ||
705 | if (tmf->response == ISCSI_TMF_RSP_COMPLETE) | |
843c0a8a | 706 | conn->tmf_state = TMF_SUCCESS; |
7ea8b828 | 707 | else if (tmf->response == ISCSI_TMF_RSP_NO_TASK) |
843c0a8a | 708 | conn->tmf_state = TMF_NOT_FOUND; |
7ea8b828 | 709 | else |
843c0a8a | 710 | conn->tmf_state = TMF_FAILED; |
7ea8b828 MC |
711 | wake_up(&conn->ehwait); |
712 | } | |
713 | ||
f6d5180c MC |
714 | static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr) |
715 | { | |
716 | struct iscsi_nopout hdr; | |
9c19a7d0 | 717 | struct iscsi_task *task; |
f6d5180c | 718 | |
9c19a7d0 | 719 | if (!rhdr && conn->ping_task) |
f6d5180c MC |
720 | return; |
721 | ||
722 | memset(&hdr, 0, sizeof(struct iscsi_nopout)); | |
723 | hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE; | |
724 | hdr.flags = ISCSI_FLAG_CMD_FINAL; | |
725 | ||
726 | if (rhdr) { | |
727 | memcpy(hdr.lun, rhdr->lun, 8); | |
728 | hdr.ttt = rhdr->ttt; | |
729 | hdr.itt = RESERVED_ITT; | |
730 | } else | |
731 | hdr.ttt = RESERVED_ITT; | |
732 | ||
9c19a7d0 MC |
733 | task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0); |
734 | if (!task) | |
322d739d | 735 | iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n"); |
d3acf022 MC |
736 | else if (!rhdr) { |
737 | /* only track our nops */ | |
738 | conn->ping_task = task; | |
739 | conn->last_ping = jiffies; | |
740 | } | |
f6d5180c MC |
741 | } |
742 | ||
62f38300 MC |
743 | static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
744 | char *data, int datalen) | |
745 | { | |
746 | struct iscsi_reject *reject = (struct iscsi_reject *)hdr; | |
747 | struct iscsi_hdr rejected_pdu; | |
748 | uint32_t itt; | |
749 | ||
750 | conn->exp_statsn = be32_to_cpu(reject->statsn) + 1; | |
751 | ||
752 | if (reject->reason == ISCSI_REASON_DATA_DIGEST_ERROR) { | |
753 | if (ntoh24(reject->dlength) > datalen) | |
754 | return ISCSI_ERR_PROTO; | |
755 | ||
756 | if (ntoh24(reject->dlength) >= sizeof(struct iscsi_hdr)) { | |
757 | memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr)); | |
b4377356 | 758 | itt = get_itt(rejected_pdu.itt); |
322d739d MC |
759 | iscsi_conn_printk(KERN_ERR, conn, |
760 | "itt 0x%x had pdu (op 0x%x) rejected " | |
761 | "due to DataDigest error.\n", itt, | |
762 | rejected_pdu.opcode); | |
62f38300 MC |
763 | } |
764 | } | |
765 | return 0; | |
766 | } | |
767 | ||
913e5bf4 MC |
768 | /** |
769 | * iscsi_itt_to_task - look up task by itt | |
770 | * @conn: iscsi connection | |
771 | * @itt: itt | |
772 | * | |
773 | * This should be used for mgmt tasks like login and nops, or if | |
774 | * the LDD's itt space does not include the session age. | |
775 | * | |
776 | * The session lock must be held. | |
777 | */ | |
778 | static struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt) | |
779 | { | |
780 | struct iscsi_session *session = conn->session; | |
781 | uint32_t i; | |
782 | ||
783 | if (itt == RESERVED_ITT) | |
784 | return NULL; | |
785 | ||
786 | i = get_itt(itt); | |
787 | if (i >= session->cmds_max) | |
788 | return NULL; | |
789 | ||
790 | return session->cmds[i]; | |
791 | } | |
792 | ||
7996a778 MC |
793 | /** |
794 | * __iscsi_complete_pdu - complete pdu | |
795 | * @conn: iscsi conn | |
796 | * @hdr: iscsi header | |
797 | * @data: data buffer | |
798 | * @datalen: len of data buffer | |
799 | * | |
800 | * Completes pdu processing by freeing any resources allocated at | |
801 | * queuecommand or send generic. session lock must be held and verify | |
802 | * itt must have been called. | |
803 | */ | |
913e5bf4 MC |
804 | int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
805 | char *data, int datalen) | |
7996a778 MC |
806 | { |
807 | struct iscsi_session *session = conn->session; | |
808 | int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0; | |
9c19a7d0 | 809 | struct iscsi_task *task; |
7996a778 MC |
810 | uint32_t itt; |
811 | ||
f6d5180c | 812 | conn->last_recv = jiffies; |
0af967f5 MC |
813 | rc = iscsi_verify_itt(conn, hdr->itt); |
814 | if (rc) | |
815 | return rc; | |
816 | ||
b4377356 AV |
817 | if (hdr->itt != RESERVED_ITT) |
818 | itt = get_itt(hdr->itt); | |
7996a778 | 819 | else |
b4377356 | 820 | itt = ~0U; |
7996a778 | 821 | |
3e5c28ad MC |
822 | debug_scsi("[op 0x%x cid %d itt 0x%x len %d]\n", |
823 | opcode, conn->id, itt, datalen); | |
7996a778 | 824 | |
3e5c28ad | 825 | if (itt == ~0U) { |
77a23c21 | 826 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); |
62f38300 | 827 | |
7996a778 MC |
828 | switch(opcode) { |
829 | case ISCSI_OP_NOOP_IN: | |
40527afe | 830 | if (datalen) { |
7996a778 | 831 | rc = ISCSI_ERR_PROTO; |
40527afe MC |
832 | break; |
833 | } | |
834 | ||
b4377356 | 835 | if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG)) |
40527afe MC |
836 | break; |
837 | ||
f6d5180c | 838 | iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr); |
7996a778 MC |
839 | break; |
840 | case ISCSI_OP_REJECT: | |
62f38300 MC |
841 | rc = iscsi_handle_reject(conn, hdr, data, datalen); |
842 | break; | |
7996a778 | 843 | case ISCSI_OP_ASYNC_EVENT: |
8d2860b3 | 844 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
5831c737 MC |
845 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) |
846 | rc = ISCSI_ERR_CONN_FAILED; | |
7996a778 MC |
847 | break; |
848 | default: | |
849 | rc = ISCSI_ERR_BAD_OPCODE; | |
850 | break; | |
851 | } | |
3e5c28ad MC |
852 | goto out; |
853 | } | |
854 | ||
3e5c28ad MC |
855 | switch(opcode) { |
856 | case ISCSI_OP_SCSI_CMD_RSP: | |
913e5bf4 MC |
857 | case ISCSI_OP_SCSI_DATA_IN: |
858 | task = iscsi_itt_to_ctask(conn, hdr->itt); | |
859 | if (!task) | |
860 | return ISCSI_ERR_BAD_ITT; | |
861 | break; | |
862 | case ISCSI_OP_R2T: | |
863 | /* | |
864 | * LLD handles R2Ts if they need to. | |
865 | */ | |
866 | return 0; | |
867 | case ISCSI_OP_LOGOUT_RSP: | |
868 | case ISCSI_OP_LOGIN_RSP: | |
869 | case ISCSI_OP_TEXT_RSP: | |
870 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
871 | case ISCSI_OP_NOOP_IN: | |
872 | task = iscsi_itt_to_task(conn, hdr->itt); | |
873 | if (!task) | |
874 | return ISCSI_ERR_BAD_ITT; | |
875 | break; | |
876 | default: | |
877 | return ISCSI_ERR_BAD_OPCODE; | |
878 | } | |
879 | ||
880 | switch(opcode) { | |
881 | case ISCSI_OP_SCSI_CMD_RSP: | |
9c19a7d0 | 882 | iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen); |
3e5c28ad MC |
883 | break; |
884 | case ISCSI_OP_SCSI_DATA_IN: | |
1d9edf02 | 885 | iscsi_data_in_rsp(conn, hdr, task); |
3e5c28ad | 886 | break; |
3e5c28ad MC |
887 | case ISCSI_OP_LOGOUT_RSP: |
888 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
889 | if (datalen) { | |
890 | rc = ISCSI_ERR_PROTO; | |
891 | break; | |
892 | } | |
893 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
894 | goto recv_pdu; | |
895 | case ISCSI_OP_LOGIN_RSP: | |
896 | case ISCSI_OP_TEXT_RSP: | |
897 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
898 | /* | |
899 | * login related PDU's exp_statsn is handled in | |
900 | * userspace | |
901 | */ | |
902 | goto recv_pdu; | |
903 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
904 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
905 | if (datalen) { | |
906 | rc = ISCSI_ERR_PROTO; | |
907 | break; | |
908 | } | |
909 | ||
910 | iscsi_tmf_rsp(conn, hdr); | |
9c19a7d0 | 911 | __iscsi_put_task(task); |
3e5c28ad MC |
912 | break; |
913 | case ISCSI_OP_NOOP_IN: | |
914 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
915 | if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) { | |
916 | rc = ISCSI_ERR_PROTO; | |
917 | break; | |
918 | } | |
919 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
920 | ||
9c19a7d0 | 921 | if (conn->ping_task != task) |
3e5c28ad MC |
922 | /* |
923 | * If this is not in response to one of our | |
924 | * nops then it must be from userspace. | |
925 | */ | |
926 | goto recv_pdu; | |
9c19a7d0 MC |
927 | |
928 | mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout); | |
929 | __iscsi_put_task(task); | |
3e5c28ad MC |
930 | break; |
931 | default: | |
932 | rc = ISCSI_ERR_BAD_OPCODE; | |
933 | break; | |
934 | } | |
7996a778 | 935 | |
3e5c28ad MC |
936 | out: |
937 | return rc; | |
938 | recv_pdu: | |
939 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) | |
940 | rc = ISCSI_ERR_CONN_FAILED; | |
9c19a7d0 | 941 | __iscsi_put_task(task); |
7996a778 MC |
942 | return rc; |
943 | } | |
913e5bf4 | 944 | EXPORT_SYMBOL_GPL(__iscsi_complete_pdu); |
7996a778 MC |
945 | |
946 | int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
947 | char *data, int datalen) | |
948 | { | |
949 | int rc; | |
950 | ||
951 | spin_lock(&conn->session->lock); | |
952 | rc = __iscsi_complete_pdu(conn, hdr, data, datalen); | |
953 | spin_unlock(&conn->session->lock); | |
954 | return rc; | |
955 | } | |
956 | EXPORT_SYMBOL_GPL(iscsi_complete_pdu); | |
957 | ||
0af967f5 | 958 | int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt) |
7996a778 MC |
959 | { |
960 | struct iscsi_session *session = conn->session; | |
3e5c28ad | 961 | uint32_t i; |
7996a778 | 962 | |
0af967f5 MC |
963 | if (itt == RESERVED_ITT) |
964 | return 0; | |
7996a778 | 965 | |
0af967f5 MC |
966 | if (((__force u32)itt & ISCSI_AGE_MASK) != |
967 | (session->age << ISCSI_AGE_SHIFT)) { | |
968 | iscsi_conn_printk(KERN_ERR, conn, | |
969 | "received itt %x expected session age (%x)\n", | |
913e5bf4 | 970 | (__force u32)itt, session->age); |
0af967f5 MC |
971 | return ISCSI_ERR_BAD_ITT; |
972 | } | |
7996a778 | 973 | |
3e5c28ad MC |
974 | i = get_itt(itt); |
975 | if (i >= session->cmds_max) { | |
976 | iscsi_conn_printk(KERN_ERR, conn, | |
977 | "received invalid itt index %u (max cmds " | |
978 | "%u.\n", i, session->cmds_max); | |
979 | return ISCSI_ERR_BAD_ITT; | |
7996a778 | 980 | } |
7996a778 MC |
981 | return 0; |
982 | } | |
983 | EXPORT_SYMBOL_GPL(iscsi_verify_itt); | |
984 | ||
913e5bf4 MC |
985 | /** |
986 | * iscsi_itt_to_ctask - look up ctask by itt | |
987 | * @conn: iscsi connection | |
988 | * @itt: itt | |
989 | * | |
990 | * This should be used for cmd tasks. | |
991 | * | |
992 | * The session lock must be held. | |
993 | */ | |
994 | struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt) | |
0af967f5 | 995 | { |
9c19a7d0 | 996 | struct iscsi_task *task; |
0af967f5 MC |
997 | |
998 | if (iscsi_verify_itt(conn, itt)) | |
999 | return NULL; | |
1000 | ||
913e5bf4 MC |
1001 | task = iscsi_itt_to_task(conn, itt); |
1002 | if (!task || !task->sc) | |
0af967f5 MC |
1003 | return NULL; |
1004 | ||
913e5bf4 MC |
1005 | if (task->sc->SCp.phase != conn->session->age) { |
1006 | iscsi_session_printk(KERN_ERR, conn->session, | |
1007 | "task's session age %d, expected %d\n", | |
1008 | task->sc->SCp.phase, conn->session->age); | |
0af967f5 | 1009 | return NULL; |
913e5bf4 | 1010 | } |
0af967f5 | 1011 | |
9c19a7d0 | 1012 | return task; |
0af967f5 MC |
1013 | } |
1014 | EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask); | |
1015 | ||
e5bd7b54 MC |
1016 | void iscsi_session_failure(struct iscsi_cls_session *cls_session, |
1017 | enum iscsi_err err) | |
1018 | { | |
1019 | struct iscsi_session *session = cls_session->dd_data; | |
1020 | struct iscsi_conn *conn; | |
1021 | struct device *dev; | |
1022 | unsigned long flags; | |
1023 | ||
1024 | spin_lock_irqsave(&session->lock, flags); | |
1025 | conn = session->leadconn; | |
1026 | if (session->state == ISCSI_STATE_TERMINATE || !conn) { | |
1027 | spin_unlock_irqrestore(&session->lock, flags); | |
1028 | return; | |
1029 | } | |
1030 | ||
1031 | dev = get_device(&conn->cls_conn->dev); | |
1032 | spin_unlock_irqrestore(&session->lock, flags); | |
1033 | if (!dev) | |
1034 | return; | |
1035 | /* | |
1036 | * if the host is being removed bypass the connection | |
1037 | * recovery initialization because we are going to kill | |
1038 | * the session. | |
1039 | */ | |
1040 | if (err == ISCSI_ERR_INVALID_HOST) | |
1041 | iscsi_conn_error_event(conn->cls_conn, err); | |
1042 | else | |
1043 | iscsi_conn_failure(conn, err); | |
1044 | put_device(dev); | |
1045 | } | |
1046 | EXPORT_SYMBOL_GPL(iscsi_session_failure); | |
1047 | ||
7996a778 MC |
1048 | void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) |
1049 | { | |
1050 | struct iscsi_session *session = conn->session; | |
1051 | unsigned long flags; | |
1052 | ||
1053 | spin_lock_irqsave(&session->lock, flags); | |
656cffc9 MC |
1054 | if (session->state == ISCSI_STATE_FAILED) { |
1055 | spin_unlock_irqrestore(&session->lock, flags); | |
1056 | return; | |
1057 | } | |
1058 | ||
67a61114 | 1059 | if (conn->stop_stage == 0) |
7996a778 MC |
1060 | session->state = ISCSI_STATE_FAILED; |
1061 | spin_unlock_irqrestore(&session->lock, flags); | |
e5bd7b54 | 1062 | |
7996a778 MC |
1063 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
1064 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
e5bd7b54 | 1065 | iscsi_conn_error_event(conn->cls_conn, err); |
7996a778 MC |
1066 | } |
1067 | EXPORT_SYMBOL_GPL(iscsi_conn_failure); | |
1068 | ||
77a23c21 MC |
1069 | static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn) |
1070 | { | |
1071 | struct iscsi_session *session = conn->session; | |
1072 | ||
1073 | /* | |
1074 | * Check for iSCSI window and take care of CmdSN wrap-around | |
1075 | */ | |
e0726407 MC |
1076 | if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) { |
1077 | debug_scsi("iSCSI CmdSN closed. ExpCmdSn %u MaxCmdSN %u " | |
1078 | "CmdSN %u/%u\n", session->exp_cmdsn, | |
1079 | session->max_cmdsn, session->cmdsn, | |
1080 | session->queued_cmdsn); | |
77a23c21 MC |
1081 | return -ENOSPC; |
1082 | } | |
1083 | return 0; | |
1084 | } | |
1085 | ||
9c19a7d0 | 1086 | static int iscsi_xmit_task(struct iscsi_conn *conn) |
77a23c21 | 1087 | { |
9c19a7d0 | 1088 | struct iscsi_task *task = conn->task; |
843c0a8a | 1089 | int rc; |
77a23c21 | 1090 | |
9c19a7d0 | 1091 | __iscsi_get_task(task); |
77a23c21 | 1092 | spin_unlock_bh(&conn->session->lock); |
9c19a7d0 | 1093 | rc = conn->session->tt->xmit_task(task); |
77a23c21 | 1094 | spin_lock_bh(&conn->session->lock); |
9c19a7d0 | 1095 | __iscsi_put_task(task); |
77a23c21 | 1096 | if (!rc) |
9c19a7d0 MC |
1097 | /* done with this task */ |
1098 | conn->task = NULL; | |
77a23c21 MC |
1099 | return rc; |
1100 | } | |
1101 | ||
843c0a8a | 1102 | /** |
9c19a7d0 MC |
1103 | * iscsi_requeue_task - requeue task to run from session workqueue |
1104 | * @task: task to requeue | |
843c0a8a | 1105 | * |
9c19a7d0 | 1106 | * LLDs that need to run a task from the session workqueue should call |
052d0144 MC |
1107 | * this. The session lock must be held. This should only be called |
1108 | * by software drivers. | |
843c0a8a | 1109 | */ |
9c19a7d0 | 1110 | void iscsi_requeue_task(struct iscsi_task *task) |
843c0a8a | 1111 | { |
9c19a7d0 | 1112 | struct iscsi_conn *conn = task->conn; |
843c0a8a | 1113 | |
9c19a7d0 | 1114 | list_move_tail(&task->running, &conn->requeue); |
843c0a8a MC |
1115 | scsi_queue_work(conn->session->host, &conn->xmitwork); |
1116 | } | |
9c19a7d0 | 1117 | EXPORT_SYMBOL_GPL(iscsi_requeue_task); |
843c0a8a | 1118 | |
7996a778 MC |
1119 | /** |
1120 | * iscsi_data_xmit - xmit any command into the scheduled connection | |
1121 | * @conn: iscsi connection | |
1122 | * | |
1123 | * Notes: | |
1124 | * The function can return -EAGAIN in which case the caller must | |
1125 | * re-schedule it again later or recover. '0' return code means | |
1126 | * successful xmit. | |
1127 | **/ | |
1128 | static int iscsi_data_xmit(struct iscsi_conn *conn) | |
1129 | { | |
3219e529 | 1130 | int rc = 0; |
7996a778 | 1131 | |
77a23c21 | 1132 | spin_lock_bh(&conn->session->lock); |
7996a778 MC |
1133 | if (unlikely(conn->suspend_tx)) { |
1134 | debug_scsi("conn %d Tx suspended!\n", conn->id); | |
77a23c21 | 1135 | spin_unlock_bh(&conn->session->lock); |
3219e529 | 1136 | return -ENODATA; |
7996a778 | 1137 | } |
7996a778 | 1138 | |
9c19a7d0 MC |
1139 | if (conn->task) { |
1140 | rc = iscsi_xmit_task(conn); | |
3219e529 | 1141 | if (rc) |
7996a778 | 1142 | goto again; |
7996a778 MC |
1143 | } |
1144 | ||
77a23c21 MC |
1145 | /* |
1146 | * process mgmt pdus like nops before commands since we should | |
1147 | * only have one nop-out as a ping from us and targets should not | |
1148 | * overflow us with nop-ins | |
1149 | */ | |
1150 | check_mgmt: | |
843c0a8a | 1151 | while (!list_empty(&conn->mgmtqueue)) { |
9c19a7d0 MC |
1152 | conn->task = list_entry(conn->mgmtqueue.next, |
1153 | struct iscsi_task, running); | |
1154 | if (iscsi_prep_mgmt_task(conn, conn->task)) { | |
1155 | __iscsi_put_task(conn->task); | |
1156 | conn->task = NULL; | |
b3a7ea8d MC |
1157 | continue; |
1158 | } | |
9c19a7d0 | 1159 | rc = iscsi_xmit_task(conn); |
77a23c21 MC |
1160 | if (rc) |
1161 | goto again; | |
7996a778 MC |
1162 | } |
1163 | ||
843c0a8a | 1164 | /* process pending command queue */ |
b6c395ed | 1165 | while (!list_empty(&conn->xmitqueue)) { |
843c0a8a MC |
1166 | if (conn->tmf_state == TMF_QUEUED) |
1167 | break; | |
1168 | ||
9c19a7d0 MC |
1169 | conn->task = list_entry(conn->xmitqueue.next, |
1170 | struct iscsi_task, running); | |
b3a7ea8d | 1171 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) { |
9c19a7d0 | 1172 | fail_command(conn, conn->task, DID_IMM_RETRY << 16); |
b3a7ea8d MC |
1173 | continue; |
1174 | } | |
577577da MC |
1175 | rc = iscsi_prep_scsi_cmd_pdu(conn->task); |
1176 | if (rc) { | |
1177 | if (rc == -ENOMEM) { | |
1178 | conn->task = NULL; | |
1179 | goto again; | |
1180 | } else | |
1181 | fail_command(conn, conn->task, DID_ABORT << 16); | |
004d6530 BH |
1182 | continue; |
1183 | } | |
9c19a7d0 | 1184 | rc = iscsi_xmit_task(conn); |
77a23c21 | 1185 | if (rc) |
60ecebf5 | 1186 | goto again; |
77a23c21 | 1187 | /* |
9c19a7d0 | 1188 | * we could continuously get new task requests so |
77a23c21 MC |
1189 | * we need to check the mgmt queue for nops that need to |
1190 | * be sent to aviod starvation | |
1191 | */ | |
843c0a8a MC |
1192 | if (!list_empty(&conn->mgmtqueue)) |
1193 | goto check_mgmt; | |
1194 | } | |
1195 | ||
1196 | while (!list_empty(&conn->requeue)) { | |
1197 | if (conn->session->fast_abort && conn->tmf_state != TMF_INITIAL) | |
1198 | break; | |
1199 | ||
b3a7ea8d MC |
1200 | /* |
1201 | * we always do fastlogout - conn stop code will clean up. | |
1202 | */ | |
1203 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) | |
1204 | break; | |
1205 | ||
9c19a7d0 MC |
1206 | conn->task = list_entry(conn->requeue.next, |
1207 | struct iscsi_task, running); | |
1208 | conn->task->state = ISCSI_TASK_RUNNING; | |
843c0a8a | 1209 | list_move_tail(conn->requeue.next, &conn->run_list); |
9c19a7d0 | 1210 | rc = iscsi_xmit_task(conn); |
843c0a8a MC |
1211 | if (rc) |
1212 | goto again; | |
1213 | if (!list_empty(&conn->mgmtqueue)) | |
77a23c21 | 1214 | goto check_mgmt; |
7996a778 | 1215 | } |
b6c395ed | 1216 | spin_unlock_bh(&conn->session->lock); |
3219e529 | 1217 | return -ENODATA; |
7996a778 MC |
1218 | |
1219 | again: | |
1220 | if (unlikely(conn->suspend_tx)) | |
77a23c21 MC |
1221 | rc = -ENODATA; |
1222 | spin_unlock_bh(&conn->session->lock); | |
3219e529 | 1223 | return rc; |
7996a778 MC |
1224 | } |
1225 | ||
c4028958 | 1226 | static void iscsi_xmitworker(struct work_struct *work) |
7996a778 | 1227 | { |
c4028958 DH |
1228 | struct iscsi_conn *conn = |
1229 | container_of(work, struct iscsi_conn, xmitwork); | |
3219e529 | 1230 | int rc; |
7996a778 MC |
1231 | /* |
1232 | * serialize Xmit worker on a per-connection basis. | |
1233 | */ | |
3219e529 MC |
1234 | do { |
1235 | rc = iscsi_data_xmit(conn); | |
1236 | } while (rc >= 0 || rc == -EAGAIN); | |
7996a778 MC |
1237 | } |
1238 | ||
577577da MC |
1239 | static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn, |
1240 | struct scsi_cmnd *sc) | |
1241 | { | |
1242 | struct iscsi_task *task; | |
1243 | ||
1244 | if (!__kfifo_get(conn->session->cmdpool.queue, | |
1245 | (void *) &task, sizeof(void *))) | |
1246 | return NULL; | |
1247 | ||
1248 | sc->SCp.phase = conn->session->age; | |
1249 | sc->SCp.ptr = (char *) task; | |
1250 | ||
1251 | atomic_set(&task->refcount, 1); | |
1252 | task->state = ISCSI_TASK_PENDING; | |
1253 | task->conn = conn; | |
1254 | task->sc = sc; | |
1255 | INIT_LIST_HEAD(&task->running); | |
1256 | return task; | |
1257 | } | |
1258 | ||
7996a778 MC |
1259 | enum { |
1260 | FAILURE_BAD_HOST = 1, | |
1261 | FAILURE_SESSION_FAILED, | |
1262 | FAILURE_SESSION_FREED, | |
1263 | FAILURE_WINDOW_CLOSED, | |
60ecebf5 | 1264 | FAILURE_OOM, |
7996a778 | 1265 | FAILURE_SESSION_TERMINATE, |
656cffc9 | 1266 | FAILURE_SESSION_IN_RECOVERY, |
7996a778 | 1267 | FAILURE_SESSION_RECOVERY_TIMEOUT, |
b3a7ea8d | 1268 | FAILURE_SESSION_LOGGING_OUT, |
6eabafbe | 1269 | FAILURE_SESSION_NOT_READY, |
7996a778 MC |
1270 | }; |
1271 | ||
1272 | int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *)) | |
1273 | { | |
75613521 | 1274 | struct iscsi_cls_session *cls_session; |
7996a778 MC |
1275 | struct Scsi_Host *host; |
1276 | int reason = 0; | |
1277 | struct iscsi_session *session; | |
1278 | struct iscsi_conn *conn; | |
9c19a7d0 | 1279 | struct iscsi_task *task = NULL; |
7996a778 MC |
1280 | |
1281 | sc->scsi_done = done; | |
1282 | sc->result = 0; | |
f47f2cf5 | 1283 | sc->SCp.ptr = NULL; |
7996a778 MC |
1284 | |
1285 | host = sc->device->host; | |
1040c99d | 1286 | spin_unlock(host->host_lock); |
7996a778 | 1287 | |
75613521 MC |
1288 | cls_session = starget_to_session(scsi_target(sc->device)); |
1289 | session = cls_session->dd_data; | |
7996a778 MC |
1290 | spin_lock(&session->lock); |
1291 | ||
75613521 | 1292 | reason = iscsi_session_chkready(cls_session); |
6eabafbe MC |
1293 | if (reason) { |
1294 | sc->result = reason; | |
1295 | goto fault; | |
1296 | } | |
1297 | ||
656cffc9 MC |
1298 | /* |
1299 | * ISCSI_STATE_FAILED is a temp. state. The recovery | |
1300 | * code will decide what is best to do with command queued | |
1301 | * during this time | |
1302 | */ | |
1303 | if (session->state != ISCSI_STATE_LOGGED_IN && | |
1304 | session->state != ISCSI_STATE_FAILED) { | |
1305 | /* | |
1306 | * to handle the race between when we set the recovery state | |
1307 | * and block the session we requeue here (commands could | |
1308 | * be entering our queuecommand while a block is starting | |
1309 | * up because the block code is not locked) | |
1310 | */ | |
9000bcd6 MC |
1311 | switch (session->state) { |
1312 | case ISCSI_STATE_IN_RECOVERY: | |
656cffc9 | 1313 | reason = FAILURE_SESSION_IN_RECOVERY; |
d6d13ee1 | 1314 | goto reject; |
9000bcd6 MC |
1315 | case ISCSI_STATE_LOGGING_OUT: |
1316 | reason = FAILURE_SESSION_LOGGING_OUT; | |
d6d13ee1 | 1317 | goto reject; |
b3a7ea8d | 1318 | case ISCSI_STATE_RECOVERY_FAILED: |
656cffc9 | 1319 | reason = FAILURE_SESSION_RECOVERY_TIMEOUT; |
56d7fcfa | 1320 | sc->result = DID_TRANSPORT_FAILFAST << 16; |
b3a7ea8d MC |
1321 | break; |
1322 | case ISCSI_STATE_TERMINATE: | |
656cffc9 | 1323 | reason = FAILURE_SESSION_TERMINATE; |
6eabafbe | 1324 | sc->result = DID_NO_CONNECT << 16; |
b3a7ea8d | 1325 | break; |
b3a7ea8d | 1326 | default: |
656cffc9 | 1327 | reason = FAILURE_SESSION_FREED; |
6eabafbe | 1328 | sc->result = DID_NO_CONNECT << 16; |
b3a7ea8d | 1329 | } |
7996a778 MC |
1330 | goto fault; |
1331 | } | |
1332 | ||
7996a778 | 1333 | conn = session->leadconn; |
98644047 MC |
1334 | if (!conn) { |
1335 | reason = FAILURE_SESSION_FREED; | |
6eabafbe | 1336 | sc->result = DID_NO_CONNECT << 16; |
98644047 MC |
1337 | goto fault; |
1338 | } | |
7996a778 | 1339 | |
77a23c21 MC |
1340 | if (iscsi_check_cmdsn_window_closed(conn)) { |
1341 | reason = FAILURE_WINDOW_CLOSED; | |
1342 | goto reject; | |
1343 | } | |
1344 | ||
577577da MC |
1345 | task = iscsi_alloc_task(conn, sc); |
1346 | if (!task) { | |
60ecebf5 MC |
1347 | reason = FAILURE_OOM; |
1348 | goto reject; | |
1349 | } | |
9c19a7d0 | 1350 | list_add_tail(&task->running, &conn->xmitqueue); |
7996a778 | 1351 | |
052d0144 | 1352 | if (session->tt->caps & CAP_DATA_PATH_OFFLOAD) { |
577577da MC |
1353 | reason = iscsi_prep_scsi_cmd_pdu(task); |
1354 | if (reason) { | |
1355 | if (reason == -ENOMEM) { | |
1356 | reason = FAILURE_OOM; | |
1357 | goto prepd_reject; | |
1358 | } else { | |
1359 | sc->result = DID_ABORT << 16; | |
1360 | goto prepd_fault; | |
1361 | } | |
052d0144 | 1362 | } |
9c19a7d0 | 1363 | if (session->tt->xmit_task(task)) { |
052d0144 | 1364 | reason = FAILURE_SESSION_NOT_READY; |
577577da | 1365 | goto prepd_reject; |
052d0144 MC |
1366 | } |
1367 | } else | |
1368 | scsi_queue_work(session->host, &conn->xmitwork); | |
1369 | ||
1370 | session->queued_cmdsn++; | |
1371 | spin_unlock(&session->lock); | |
1040c99d | 1372 | spin_lock(host->host_lock); |
7996a778 MC |
1373 | return 0; |
1374 | ||
577577da MC |
1375 | prepd_reject: |
1376 | sc->scsi_done = NULL; | |
1377 | iscsi_complete_command(task); | |
7996a778 MC |
1378 | reject: |
1379 | spin_unlock(&session->lock); | |
1380 | debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason); | |
1040c99d | 1381 | spin_lock(host->host_lock); |
d6d13ee1 | 1382 | return SCSI_MLQUEUE_TARGET_BUSY; |
7996a778 | 1383 | |
577577da MC |
1384 | prepd_fault: |
1385 | sc->scsi_done = NULL; | |
1386 | iscsi_complete_command(task); | |
7996a778 MC |
1387 | fault: |
1388 | spin_unlock(&session->lock); | |
6eabafbe | 1389 | debug_scsi("iscsi: cmd 0x%x is not queued (%d)\n", sc->cmnd[0], reason); |
c07d4444 BH |
1390 | if (!scsi_bidi_cmnd(sc)) |
1391 | scsi_set_resid(sc, scsi_bufflen(sc)); | |
1392 | else { | |
1393 | scsi_out(sc)->resid = scsi_out(sc)->length; | |
1394 | scsi_in(sc)->resid = scsi_in(sc)->length; | |
1395 | } | |
052d0144 | 1396 | done(sc); |
1040c99d | 1397 | spin_lock(host->host_lock); |
7996a778 MC |
1398 | return 0; |
1399 | } | |
1400 | EXPORT_SYMBOL_GPL(iscsi_queuecommand); | |
1401 | ||
1402 | int iscsi_change_queue_depth(struct scsi_device *sdev, int depth) | |
1403 | { | |
1404 | if (depth > ISCSI_MAX_CMD_PER_LUN) | |
1405 | depth = ISCSI_MAX_CMD_PER_LUN; | |
1406 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); | |
1407 | return sdev->queue_depth; | |
1408 | } | |
1409 | EXPORT_SYMBOL_GPL(iscsi_change_queue_depth); | |
1410 | ||
7996a778 MC |
1411 | void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session) |
1412 | { | |
75613521 | 1413 | struct iscsi_session *session = cls_session->dd_data; |
7996a778 MC |
1414 | |
1415 | spin_lock_bh(&session->lock); | |
1416 | if (session->state != ISCSI_STATE_LOGGED_IN) { | |
656cffc9 | 1417 | session->state = ISCSI_STATE_RECOVERY_FAILED; |
843c0a8a MC |
1418 | if (session->leadconn) |
1419 | wake_up(&session->leadconn->ehwait); | |
7996a778 MC |
1420 | } |
1421 | spin_unlock_bh(&session->lock); | |
1422 | } | |
1423 | EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout); | |
1424 | ||
8e124525 | 1425 | int iscsi_eh_target_reset(struct scsi_cmnd *sc) |
7996a778 | 1426 | { |
75613521 MC |
1427 | struct iscsi_cls_session *cls_session; |
1428 | struct iscsi_session *session; | |
1429 | struct iscsi_conn *conn; | |
1430 | ||
1431 | cls_session = starget_to_session(scsi_target(sc->device)); | |
1432 | session = cls_session->dd_data; | |
1433 | conn = session->leadconn; | |
7996a778 | 1434 | |
bc436b27 | 1435 | mutex_lock(&session->eh_mutex); |
7996a778 MC |
1436 | spin_lock_bh(&session->lock); |
1437 | if (session->state == ISCSI_STATE_TERMINATE) { | |
1438 | failed: | |
8e124525 | 1439 | debug_scsi("failing target reset: session terminated " |
d6e24d1c | 1440 | "[CID %d age %d]\n", conn->id, session->age); |
7996a778 | 1441 | spin_unlock_bh(&session->lock); |
bc436b27 | 1442 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1443 | return FAILED; |
1444 | } | |
1445 | ||
7996a778 | 1446 | spin_unlock_bh(&session->lock); |
bc436b27 | 1447 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1448 | /* |
1449 | * we drop the lock here but the leadconn cannot be destoyed while | |
1450 | * we are in the scsi eh | |
1451 | */ | |
843c0a8a | 1452 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
7996a778 | 1453 | |
8e124525 | 1454 | debug_scsi("iscsi_eh_target_reset wait for relogin\n"); |
7996a778 MC |
1455 | wait_event_interruptible(conn->ehwait, |
1456 | session->state == ISCSI_STATE_TERMINATE || | |
1457 | session->state == ISCSI_STATE_LOGGED_IN || | |
656cffc9 | 1458 | session->state == ISCSI_STATE_RECOVERY_FAILED); |
7996a778 MC |
1459 | if (signal_pending(current)) |
1460 | flush_signals(current); | |
1461 | ||
bc436b27 | 1462 | mutex_lock(&session->eh_mutex); |
7996a778 MC |
1463 | spin_lock_bh(&session->lock); |
1464 | if (session->state == ISCSI_STATE_LOGGED_IN) | |
322d739d | 1465 | iscsi_session_printk(KERN_INFO, session, |
8e124525 | 1466 | "target reset succeeded\n"); |
7996a778 MC |
1467 | else |
1468 | goto failed; | |
1469 | spin_unlock_bh(&session->lock); | |
bc436b27 | 1470 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1471 | return SUCCESS; |
1472 | } | |
8e124525 | 1473 | EXPORT_SYMBOL_GPL(iscsi_eh_target_reset); |
7996a778 | 1474 | |
843c0a8a | 1475 | static void iscsi_tmf_timedout(unsigned long data) |
7996a778 | 1476 | { |
843c0a8a | 1477 | struct iscsi_conn *conn = (struct iscsi_conn *)data; |
7996a778 MC |
1478 | struct iscsi_session *session = conn->session; |
1479 | ||
1480 | spin_lock(&session->lock); | |
843c0a8a MC |
1481 | if (conn->tmf_state == TMF_QUEUED) { |
1482 | conn->tmf_state = TMF_TIMEDOUT; | |
1483 | debug_scsi("tmf timedout\n"); | |
7996a778 MC |
1484 | /* unblock eh_abort() */ |
1485 | wake_up(&conn->ehwait); | |
1486 | } | |
1487 | spin_unlock(&session->lock); | |
1488 | } | |
1489 | ||
9c19a7d0 | 1490 | static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn, |
f6d5180c MC |
1491 | struct iscsi_tm *hdr, int age, |
1492 | int timeout) | |
7996a778 | 1493 | { |
7996a778 | 1494 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 1495 | struct iscsi_task *task; |
7996a778 | 1496 | |
9c19a7d0 | 1497 | task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr, |
843c0a8a | 1498 | NULL, 0); |
9c19a7d0 | 1499 | if (!task) { |
6724add1 | 1500 | spin_unlock_bh(&session->lock); |
7996a778 | 1501 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
843c0a8a MC |
1502 | spin_lock_bh(&session->lock); |
1503 | debug_scsi("tmf exec failure\n"); | |
77a23c21 | 1504 | return -EPERM; |
7996a778 | 1505 | } |
843c0a8a | 1506 | conn->tmfcmd_pdus_cnt++; |
f6d5180c | 1507 | conn->tmf_timer.expires = timeout * HZ + jiffies; |
843c0a8a MC |
1508 | conn->tmf_timer.function = iscsi_tmf_timedout; |
1509 | conn->tmf_timer.data = (unsigned long)conn; | |
1510 | add_timer(&conn->tmf_timer); | |
1511 | debug_scsi("tmf set timeout\n"); | |
7996a778 | 1512 | |
7996a778 | 1513 | spin_unlock_bh(&session->lock); |
6724add1 | 1514 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1515 | |
1516 | /* | |
1517 | * block eh thread until: | |
1518 | * | |
843c0a8a MC |
1519 | * 1) tmf response |
1520 | * 2) tmf timeout | |
7996a778 MC |
1521 | * 3) session is terminated or restarted or userspace has |
1522 | * given up on recovery | |
1523 | */ | |
843c0a8a | 1524 | wait_event_interruptible(conn->ehwait, age != session->age || |
7996a778 | 1525 | session->state != ISCSI_STATE_LOGGED_IN || |
843c0a8a | 1526 | conn->tmf_state != TMF_QUEUED); |
7996a778 MC |
1527 | if (signal_pending(current)) |
1528 | flush_signals(current); | |
843c0a8a MC |
1529 | del_timer_sync(&conn->tmf_timer); |
1530 | ||
6724add1 | 1531 | mutex_lock(&session->eh_mutex); |
77a23c21 | 1532 | spin_lock_bh(&session->lock); |
9c19a7d0 | 1533 | /* if the session drops it will clean up the task */ |
843c0a8a MC |
1534 | if (age != session->age || |
1535 | session->state != ISCSI_STATE_LOGGED_IN) | |
1536 | return -ENOTCONN; | |
7996a778 MC |
1537 | return 0; |
1538 | } | |
1539 | ||
843c0a8a MC |
1540 | /* |
1541 | * Fail commands. session lock held and recv side suspended and xmit | |
1542 | * thread flushed | |
1543 | */ | |
6eabafbe MC |
1544 | static void fail_all_commands(struct iscsi_conn *conn, unsigned lun, |
1545 | int error) | |
843c0a8a | 1546 | { |
9c19a7d0 | 1547 | struct iscsi_task *task, *tmp; |
843c0a8a | 1548 | |
9c19a7d0 MC |
1549 | if (conn->task && (conn->task->sc->device->lun == lun || lun == -1)) |
1550 | conn->task = NULL; | |
843c0a8a MC |
1551 | |
1552 | /* flush pending */ | |
9c19a7d0 MC |
1553 | list_for_each_entry_safe(task, tmp, &conn->xmitqueue, running) { |
1554 | if (lun == task->sc->device->lun || lun == -1) { | |
843c0a8a | 1555 | debug_scsi("failing pending sc %p itt 0x%x\n", |
9c19a7d0 MC |
1556 | task->sc, task->itt); |
1557 | fail_command(conn, task, error << 16); | |
843c0a8a MC |
1558 | } |
1559 | } | |
1560 | ||
9c19a7d0 MC |
1561 | list_for_each_entry_safe(task, tmp, &conn->requeue, running) { |
1562 | if (lun == task->sc->device->lun || lun == -1) { | |
843c0a8a | 1563 | debug_scsi("failing requeued sc %p itt 0x%x\n", |
9c19a7d0 MC |
1564 | task->sc, task->itt); |
1565 | fail_command(conn, task, error << 16); | |
843c0a8a MC |
1566 | } |
1567 | } | |
1568 | ||
1569 | /* fail all other running */ | |
9c19a7d0 MC |
1570 | list_for_each_entry_safe(task, tmp, &conn->run_list, running) { |
1571 | if (lun == task->sc->device->lun || lun == -1) { | |
843c0a8a | 1572 | debug_scsi("failing in progress sc %p itt 0x%x\n", |
9c19a7d0 | 1573 | task->sc, task->itt); |
ac26d41d | 1574 | fail_command(conn, task, error << 16); |
843c0a8a MC |
1575 | } |
1576 | } | |
1577 | } | |
1578 | ||
b40977d9 | 1579 | void iscsi_suspend_tx(struct iscsi_conn *conn) |
6724add1 MC |
1580 | { |
1581 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
052d0144 MC |
1582 | if (!(conn->session->tt->caps & CAP_DATA_PATH_OFFLOAD)) |
1583 | scsi_flush_work(conn->session->host); | |
6724add1 | 1584 | } |
b40977d9 | 1585 | EXPORT_SYMBOL_GPL(iscsi_suspend_tx); |
6724add1 MC |
1586 | |
1587 | static void iscsi_start_tx(struct iscsi_conn *conn) | |
1588 | { | |
1589 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
052d0144 MC |
1590 | if (!(conn->session->tt->caps & CAP_DATA_PATH_OFFLOAD)) |
1591 | scsi_queue_work(conn->session->host, &conn->xmitwork); | |
6724add1 MC |
1592 | } |
1593 | ||
242f9dcb | 1594 | static enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *scmd) |
f6d5180c MC |
1595 | { |
1596 | struct iscsi_cls_session *cls_session; | |
1597 | struct iscsi_session *session; | |
1598 | struct iscsi_conn *conn; | |
242f9dcb | 1599 | enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED; |
f6d5180c MC |
1600 | |
1601 | cls_session = starget_to_session(scsi_target(scmd->device)); | |
75613521 | 1602 | session = cls_session->dd_data; |
f6d5180c MC |
1603 | |
1604 | debug_scsi("scsi cmd %p timedout\n", scmd); | |
1605 | ||
1606 | spin_lock(&session->lock); | |
1607 | if (session->state != ISCSI_STATE_LOGGED_IN) { | |
1608 | /* | |
1609 | * We are probably in the middle of iscsi recovery so let | |
1610 | * that complete and handle the error. | |
1611 | */ | |
242f9dcb | 1612 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
1613 | goto done; |
1614 | } | |
1615 | ||
1616 | conn = session->leadconn; | |
1617 | if (!conn) { | |
1618 | /* In the middle of shuting down */ | |
242f9dcb | 1619 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
1620 | goto done; |
1621 | } | |
1622 | ||
1623 | if (!conn->recv_timeout && !conn->ping_timeout) | |
1624 | goto done; | |
1625 | /* | |
1626 | * if the ping timedout then we are in the middle of cleaning up | |
1627 | * and can let the iscsi eh handle it | |
1628 | */ | |
1629 | if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) + | |
1630 | (conn->ping_timeout * HZ), jiffies)) | |
242f9dcb | 1631 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
1632 | /* |
1633 | * if we are about to check the transport then give the command | |
1634 | * more time | |
1635 | */ | |
1636 | if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ), | |
1637 | jiffies)) | |
242f9dcb | 1638 | rc = BLK_EH_RESET_TIMER; |
f6d5180c | 1639 | /* if in the middle of checking the transport then give us more time */ |
9c19a7d0 | 1640 | if (conn->ping_task) |
242f9dcb | 1641 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
1642 | done: |
1643 | spin_unlock(&session->lock); | |
242f9dcb JA |
1644 | debug_scsi("return %s\n", rc == BLK_EH_RESET_TIMER ? |
1645 | "timer reset" : "nh"); | |
f6d5180c MC |
1646 | return rc; |
1647 | } | |
1648 | ||
1649 | static void iscsi_check_transport_timeouts(unsigned long data) | |
1650 | { | |
1651 | struct iscsi_conn *conn = (struct iscsi_conn *)data; | |
1652 | struct iscsi_session *session = conn->session; | |
4cf10435 | 1653 | unsigned long recv_timeout, next_timeout = 0, last_recv; |
f6d5180c MC |
1654 | |
1655 | spin_lock(&session->lock); | |
1656 | if (session->state != ISCSI_STATE_LOGGED_IN) | |
1657 | goto done; | |
1658 | ||
4cf10435 MC |
1659 | recv_timeout = conn->recv_timeout; |
1660 | if (!recv_timeout) | |
f6d5180c MC |
1661 | goto done; |
1662 | ||
4cf10435 | 1663 | recv_timeout *= HZ; |
f6d5180c | 1664 | last_recv = conn->last_recv; |
9c19a7d0 | 1665 | if (conn->ping_task && |
4cf10435 | 1666 | time_before_eq(conn->last_ping + (conn->ping_timeout * HZ), |
f6d5180c | 1667 | jiffies)) { |
322d739d MC |
1668 | iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs " |
1669 | "expired, last rx %lu, last ping %lu, " | |
1670 | "now %lu\n", conn->ping_timeout, last_recv, | |
1671 | conn->last_ping, jiffies); | |
f6d5180c MC |
1672 | spin_unlock(&session->lock); |
1673 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1674 | return; | |
1675 | } | |
1676 | ||
4cf10435 | 1677 | if (time_before_eq(last_recv + recv_timeout, jiffies)) { |
c8611f97 MC |
1678 | /* send a ping to try to provoke some traffic */ |
1679 | debug_scsi("Sending nopout as ping on conn %p\n", conn); | |
1680 | iscsi_send_nopout(conn, NULL); | |
4cf10435 | 1681 | next_timeout = conn->last_ping + (conn->ping_timeout * HZ); |
ad294e9c | 1682 | } else |
4cf10435 | 1683 | next_timeout = last_recv + recv_timeout; |
f6d5180c | 1684 | |
ad294e9c MC |
1685 | debug_scsi("Setting next tmo %lu\n", next_timeout); |
1686 | mod_timer(&conn->transport_timer, next_timeout); | |
f6d5180c MC |
1687 | done: |
1688 | spin_unlock(&session->lock); | |
1689 | } | |
1690 | ||
9c19a7d0 | 1691 | static void iscsi_prep_abort_task_pdu(struct iscsi_task *task, |
843c0a8a MC |
1692 | struct iscsi_tm *hdr) |
1693 | { | |
1694 | memset(hdr, 0, sizeof(*hdr)); | |
1695 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
1696 | hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK; | |
1697 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
577577da MC |
1698 | memcpy(hdr->lun, task->lun, sizeof(hdr->lun)); |
1699 | hdr->rtt = task->hdr_itt; | |
1700 | hdr->refcmdsn = task->cmdsn; | |
843c0a8a MC |
1701 | } |
1702 | ||
7996a778 MC |
1703 | int iscsi_eh_abort(struct scsi_cmnd *sc) |
1704 | { | |
75613521 MC |
1705 | struct iscsi_cls_session *cls_session; |
1706 | struct iscsi_session *session; | |
f47f2cf5 | 1707 | struct iscsi_conn *conn; |
9c19a7d0 | 1708 | struct iscsi_task *task; |
843c0a8a MC |
1709 | struct iscsi_tm *hdr; |
1710 | int rc, age; | |
7996a778 | 1711 | |
75613521 MC |
1712 | cls_session = starget_to_session(scsi_target(sc->device)); |
1713 | session = cls_session->dd_data; | |
1714 | ||
6724add1 MC |
1715 | mutex_lock(&session->eh_mutex); |
1716 | spin_lock_bh(&session->lock); | |
f47f2cf5 MC |
1717 | /* |
1718 | * if session was ISCSI_STATE_IN_RECOVERY then we may not have | |
1719 | * got the command. | |
1720 | */ | |
1721 | if (!sc->SCp.ptr) { | |
1722 | debug_scsi("sc never reached iscsi layer or it completed.\n"); | |
6724add1 MC |
1723 | spin_unlock_bh(&session->lock); |
1724 | mutex_unlock(&session->eh_mutex); | |
f47f2cf5 MC |
1725 | return SUCCESS; |
1726 | } | |
1727 | ||
7996a778 MC |
1728 | /* |
1729 | * If we are not logged in or we have started a new session | |
1730 | * then let the host reset code handle this | |
1731 | */ | |
843c0a8a MC |
1732 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN || |
1733 | sc->SCp.phase != session->age) { | |
1734 | spin_unlock_bh(&session->lock); | |
1735 | mutex_unlock(&session->eh_mutex); | |
1736 | return FAILED; | |
1737 | } | |
1738 | ||
1739 | conn = session->leadconn; | |
1740 | conn->eh_abort_cnt++; | |
1741 | age = session->age; | |
1742 | ||
9c19a7d0 MC |
1743 | task = (struct iscsi_task *)sc->SCp.ptr; |
1744 | debug_scsi("aborting [sc %p itt 0x%x]\n", sc, task->itt); | |
7996a778 | 1745 | |
9c19a7d0 MC |
1746 | /* task completed before time out */ |
1747 | if (!task->sc) { | |
7ea8b828 | 1748 | debug_scsi("sc completed while abort in progress\n"); |
77a23c21 | 1749 | goto success; |
7ea8b828 | 1750 | } |
7996a778 | 1751 | |
9c19a7d0 MC |
1752 | if (task->state == ISCSI_TASK_PENDING) { |
1753 | fail_command(conn, task, DID_ABORT << 16); | |
77a23c21 MC |
1754 | goto success; |
1755 | } | |
7996a778 | 1756 | |
843c0a8a MC |
1757 | /* only have one tmf outstanding at a time */ |
1758 | if (conn->tmf_state != TMF_INITIAL) | |
7996a778 | 1759 | goto failed; |
843c0a8a | 1760 | conn->tmf_state = TMF_QUEUED; |
7996a778 | 1761 | |
843c0a8a | 1762 | hdr = &conn->tmhdr; |
9c19a7d0 | 1763 | iscsi_prep_abort_task_pdu(task, hdr); |
843c0a8a | 1764 | |
9c19a7d0 | 1765 | if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) { |
843c0a8a MC |
1766 | rc = FAILED; |
1767 | goto failed; | |
1768 | } | |
1769 | ||
1770 | switch (conn->tmf_state) { | |
1771 | case TMF_SUCCESS: | |
77a23c21 | 1772 | spin_unlock_bh(&session->lock); |
913e5bf4 MC |
1773 | /* |
1774 | * stop tx side incase the target had sent a abort rsp but | |
1775 | * the initiator was still writing out data. | |
1776 | */ | |
6724add1 | 1777 | iscsi_suspend_tx(conn); |
77a23c21 | 1778 | /* |
913e5bf4 MC |
1779 | * we do not stop the recv side because targets have been |
1780 | * good and have never sent us a successful tmf response | |
1781 | * then sent more data for the cmd. | |
77a23c21 | 1782 | */ |
77a23c21 | 1783 | spin_lock(&session->lock); |
9c19a7d0 | 1784 | fail_command(conn, task, DID_ABORT << 16); |
843c0a8a | 1785 | conn->tmf_state = TMF_INITIAL; |
77a23c21 | 1786 | spin_unlock(&session->lock); |
6724add1 | 1787 | iscsi_start_tx(conn); |
77a23c21 | 1788 | goto success_unlocked; |
843c0a8a MC |
1789 | case TMF_TIMEDOUT: |
1790 | spin_unlock_bh(&session->lock); | |
1791 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1792 | goto failed_unlocked; | |
1793 | case TMF_NOT_FOUND: | |
1794 | if (!sc->SCp.ptr) { | |
1795 | conn->tmf_state = TMF_INITIAL; | |
9c19a7d0 | 1796 | /* task completed before tmf abort response */ |
7ea8b828 | 1797 | debug_scsi("sc completed while abort in progress\n"); |
77a23c21 | 1798 | goto success; |
7ea8b828 MC |
1799 | } |
1800 | /* fall through */ | |
1801 | default: | |
843c0a8a MC |
1802 | conn->tmf_state = TMF_INITIAL; |
1803 | goto failed; | |
7996a778 MC |
1804 | } |
1805 | ||
77a23c21 | 1806 | success: |
7996a778 | 1807 | spin_unlock_bh(&session->lock); |
77a23c21 | 1808 | success_unlocked: |
9c19a7d0 | 1809 | debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, task->itt); |
6724add1 | 1810 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1811 | return SUCCESS; |
1812 | ||
1813 | failed: | |
1814 | spin_unlock_bh(&session->lock); | |
77a23c21 | 1815 | failed_unlocked: |
843c0a8a | 1816 | debug_scsi("abort failed [sc %p itt 0x%x]\n", sc, |
9c19a7d0 | 1817 | task ? task->itt : 0); |
6724add1 | 1818 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1819 | return FAILED; |
1820 | } | |
1821 | EXPORT_SYMBOL_GPL(iscsi_eh_abort); | |
1822 | ||
843c0a8a MC |
1823 | static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) |
1824 | { | |
1825 | memset(hdr, 0, sizeof(*hdr)); | |
1826 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
1827 | hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK; | |
1828 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
1829 | int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun); | |
f6d5180c | 1830 | hdr->rtt = RESERVED_ITT; |
843c0a8a MC |
1831 | } |
1832 | ||
1833 | int iscsi_eh_device_reset(struct scsi_cmnd *sc) | |
1834 | { | |
75613521 MC |
1835 | struct iscsi_cls_session *cls_session; |
1836 | struct iscsi_session *session; | |
843c0a8a MC |
1837 | struct iscsi_conn *conn; |
1838 | struct iscsi_tm *hdr; | |
1839 | int rc = FAILED; | |
1840 | ||
75613521 MC |
1841 | cls_session = starget_to_session(scsi_target(sc->device)); |
1842 | session = cls_session->dd_data; | |
1843 | ||
843c0a8a MC |
1844 | debug_scsi("LU Reset [sc %p lun %u]\n", sc, sc->device->lun); |
1845 | ||
1846 | mutex_lock(&session->eh_mutex); | |
1847 | spin_lock_bh(&session->lock); | |
1848 | /* | |
1849 | * Just check if we are not logged in. We cannot check for | |
1850 | * the phase because the reset could come from a ioctl. | |
1851 | */ | |
1852 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) | |
1853 | goto unlock; | |
1854 | conn = session->leadconn; | |
1855 | ||
1856 | /* only have one tmf outstanding at a time */ | |
1857 | if (conn->tmf_state != TMF_INITIAL) | |
1858 | goto unlock; | |
1859 | conn->tmf_state = TMF_QUEUED; | |
1860 | ||
1861 | hdr = &conn->tmhdr; | |
1862 | iscsi_prep_lun_reset_pdu(sc, hdr); | |
1863 | ||
9c19a7d0 | 1864 | if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, |
f6d5180c | 1865 | session->lu_reset_timeout)) { |
843c0a8a MC |
1866 | rc = FAILED; |
1867 | goto unlock; | |
1868 | } | |
1869 | ||
1870 | switch (conn->tmf_state) { | |
1871 | case TMF_SUCCESS: | |
1872 | break; | |
1873 | case TMF_TIMEDOUT: | |
1874 | spin_unlock_bh(&session->lock); | |
1875 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1876 | goto done; | |
1877 | default: | |
1878 | conn->tmf_state = TMF_INITIAL; | |
1879 | goto unlock; | |
1880 | } | |
1881 | ||
1882 | rc = SUCCESS; | |
1883 | spin_unlock_bh(&session->lock); | |
1884 | ||
1885 | iscsi_suspend_tx(conn); | |
913e5bf4 | 1886 | |
a3439148 | 1887 | spin_lock_bh(&session->lock); |
6eabafbe | 1888 | fail_all_commands(conn, sc->device->lun, DID_ERROR); |
843c0a8a | 1889 | conn->tmf_state = TMF_INITIAL; |
a3439148 | 1890 | spin_unlock_bh(&session->lock); |
843c0a8a MC |
1891 | |
1892 | iscsi_start_tx(conn); | |
1893 | goto done; | |
1894 | ||
1895 | unlock: | |
1896 | spin_unlock_bh(&session->lock); | |
1897 | done: | |
1898 | debug_scsi("iscsi_eh_device_reset %s\n", | |
1899 | rc == SUCCESS ? "SUCCESS" : "FAILED"); | |
1900 | mutex_unlock(&session->eh_mutex); | |
1901 | return rc; | |
1902 | } | |
1903 | EXPORT_SYMBOL_GPL(iscsi_eh_device_reset); | |
1904 | ||
6320377f OK |
1905 | /* |
1906 | * Pre-allocate a pool of @max items of @item_size. By default, the pool | |
1907 | * should be accessed via kfifo_{get,put} on q->queue. | |
1908 | * Optionally, the caller can obtain the array of object pointers | |
1909 | * by passing in a non-NULL @items pointer | |
1910 | */ | |
7996a778 | 1911 | int |
6320377f | 1912 | iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size) |
7996a778 | 1913 | { |
6320377f | 1914 | int i, num_arrays = 1; |
7996a778 | 1915 | |
6320377f | 1916 | memset(q, 0, sizeof(*q)); |
7996a778 MC |
1917 | |
1918 | q->max = max; | |
6320377f OK |
1919 | |
1920 | /* If the user passed an items pointer, he wants a copy of | |
1921 | * the array. */ | |
1922 | if (items) | |
1923 | num_arrays++; | |
1924 | q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL); | |
1925 | if (q->pool == NULL) | |
1926 | goto enomem; | |
7996a778 MC |
1927 | |
1928 | q->queue = kfifo_init((void*)q->pool, max * sizeof(void*), | |
1929 | GFP_KERNEL, NULL); | |
6320377f OK |
1930 | if (q->queue == ERR_PTR(-ENOMEM)) |
1931 | goto enomem; | |
7996a778 MC |
1932 | |
1933 | for (i = 0; i < max; i++) { | |
6320377f | 1934 | q->pool[i] = kzalloc(item_size, GFP_KERNEL); |
7996a778 | 1935 | if (q->pool[i] == NULL) { |
6320377f OK |
1936 | q->max = i; |
1937 | goto enomem; | |
7996a778 | 1938 | } |
7996a778 MC |
1939 | __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*)); |
1940 | } | |
6320377f OK |
1941 | |
1942 | if (items) { | |
1943 | *items = q->pool + max; | |
1944 | memcpy(*items, q->pool, max * sizeof(void *)); | |
1945 | } | |
1946 | ||
7996a778 | 1947 | return 0; |
6320377f OK |
1948 | |
1949 | enomem: | |
1950 | iscsi_pool_free(q); | |
1951 | return -ENOMEM; | |
7996a778 MC |
1952 | } |
1953 | EXPORT_SYMBOL_GPL(iscsi_pool_init); | |
1954 | ||
6320377f | 1955 | void iscsi_pool_free(struct iscsi_pool *q) |
7996a778 MC |
1956 | { |
1957 | int i; | |
1958 | ||
1959 | for (i = 0; i < q->max; i++) | |
6320377f OK |
1960 | kfree(q->pool[i]); |
1961 | if (q->pool) | |
1962 | kfree(q->pool); | |
7996a778 MC |
1963 | } |
1964 | EXPORT_SYMBOL_GPL(iscsi_pool_free); | |
1965 | ||
a4804cd6 MC |
1966 | /** |
1967 | * iscsi_host_add - add host to system | |
1968 | * @shost: scsi host | |
1969 | * @pdev: parent device | |
1970 | * | |
1971 | * This should be called by partial offload and software iscsi drivers | |
1972 | * to add a host to the system. | |
1973 | */ | |
1974 | int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev) | |
1975 | { | |
8e9a20ce MC |
1976 | if (!shost->can_queue) |
1977 | shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX; | |
1978 | ||
a4804cd6 MC |
1979 | return scsi_add_host(shost, pdev); |
1980 | } | |
1981 | EXPORT_SYMBOL_GPL(iscsi_host_add); | |
1982 | ||
1983 | /** | |
1984 | * iscsi_host_alloc - allocate a host and driver data | |
1985 | * @sht: scsi host template | |
1986 | * @dd_data_size: driver host data size | |
1987 | * @qdepth: default device queue depth | |
1988 | * | |
1989 | * This should be called by partial offload and software iscsi drivers. | |
1990 | * To access the driver specific memory use the iscsi_host_priv() macro. | |
1991 | */ | |
1992 | struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht, | |
1993 | int dd_data_size, uint16_t qdepth) | |
75613521 | 1994 | { |
a4804cd6 | 1995 | struct Scsi_Host *shost; |
e5bd7b54 | 1996 | struct iscsi_host *ihost; |
a4804cd6 MC |
1997 | |
1998 | shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size); | |
1999 | if (!shost) | |
2000 | return NULL; | |
2001 | shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out; | |
2002 | ||
75613521 MC |
2003 | if (qdepth > ISCSI_MAX_CMD_PER_LUN || qdepth < 1) { |
2004 | if (qdepth != 0) | |
2005 | printk(KERN_ERR "iscsi: invalid queue depth of %d. " | |
2006 | "Queue depth must be between 1 and %d.\n", | |
2007 | qdepth, ISCSI_MAX_CMD_PER_LUN); | |
2008 | qdepth = ISCSI_DEF_CMD_PER_LUN; | |
2009 | } | |
75613521 | 2010 | shost->cmd_per_lun = qdepth; |
e5bd7b54 MC |
2011 | |
2012 | ihost = shost_priv(shost); | |
2013 | spin_lock_init(&ihost->lock); | |
2014 | ihost->state = ISCSI_HOST_SETUP; | |
2015 | ihost->num_sessions = 0; | |
2016 | init_waitqueue_head(&ihost->session_removal_wq); | |
a4804cd6 MC |
2017 | return shost; |
2018 | } | |
2019 | EXPORT_SYMBOL_GPL(iscsi_host_alloc); | |
2020 | ||
e5bd7b54 MC |
2021 | static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session) |
2022 | { | |
2023 | iscsi_session_failure(cls_session, ISCSI_ERR_INVALID_HOST); | |
2024 | } | |
2025 | ||
a4804cd6 MC |
2026 | /** |
2027 | * iscsi_host_remove - remove host and sessions | |
2028 | * @shost: scsi host | |
2029 | * | |
e5bd7b54 MC |
2030 | * If there are any sessions left, this will initiate the removal and wait |
2031 | * for the completion. | |
a4804cd6 MC |
2032 | */ |
2033 | void iscsi_host_remove(struct Scsi_Host *shost) | |
2034 | { | |
e5bd7b54 MC |
2035 | struct iscsi_host *ihost = shost_priv(shost); |
2036 | unsigned long flags; | |
2037 | ||
2038 | spin_lock_irqsave(&ihost->lock, flags); | |
2039 | ihost->state = ISCSI_HOST_REMOVED; | |
2040 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2041 | ||
2042 | iscsi_host_for_each_session(shost, iscsi_notify_host_removed); | |
2043 | wait_event_interruptible(ihost->session_removal_wq, | |
2044 | ihost->num_sessions == 0); | |
2045 | if (signal_pending(current)) | |
2046 | flush_signals(current); | |
2047 | ||
a4804cd6 | 2048 | scsi_remove_host(shost); |
75613521 | 2049 | } |
a4804cd6 | 2050 | EXPORT_SYMBOL_GPL(iscsi_host_remove); |
7996a778 | 2051 | |
a4804cd6 | 2052 | void iscsi_host_free(struct Scsi_Host *shost) |
75613521 MC |
2053 | { |
2054 | struct iscsi_host *ihost = shost_priv(shost); | |
7996a778 | 2055 | |
75613521 MC |
2056 | kfree(ihost->netdev); |
2057 | kfree(ihost->hwaddress); | |
2058 | kfree(ihost->initiatorname); | |
a4804cd6 | 2059 | scsi_host_put(shost); |
75613521 | 2060 | } |
a4804cd6 | 2061 | EXPORT_SYMBOL_GPL(iscsi_host_free); |
7996a778 | 2062 | |
e5bd7b54 MC |
2063 | static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost) |
2064 | { | |
2065 | struct iscsi_host *ihost = shost_priv(shost); | |
2066 | unsigned long flags; | |
2067 | ||
2068 | shost = scsi_host_get(shost); | |
2069 | if (!shost) { | |
2070 | printk(KERN_ERR "Invalid state. Cannot notify host removal " | |
2071 | "of session teardown event because host already " | |
2072 | "removed.\n"); | |
2073 | return; | |
2074 | } | |
2075 | ||
2076 | spin_lock_irqsave(&ihost->lock, flags); | |
2077 | ihost->num_sessions--; | |
2078 | if (ihost->num_sessions == 0) | |
2079 | wake_up(&ihost->session_removal_wq); | |
2080 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2081 | scsi_host_put(shost); | |
2082 | } | |
2083 | ||
7996a778 MC |
2084 | /** |
2085 | * iscsi_session_setup - create iscsi cls session and host and session | |
7996a778 | 2086 | * @iscsit: iscsi transport template |
75613521 MC |
2087 | * @shost: scsi host |
2088 | * @cmds_max: session can queue | |
9c19a7d0 | 2089 | * @cmd_task_size: LLD task private data size |
7996a778 | 2090 | * @initial_cmdsn: initial CmdSN |
7996a778 MC |
2091 | * |
2092 | * This can be used by software iscsi_transports that allocate | |
2093 | * a session per scsi host. | |
3cf7b233 MC |
2094 | * |
2095 | * Callers should set cmds_max to the largest total numer (mgmt + scsi) of | |
2096 | * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks | |
2097 | * for nop handling and login/logout requests. | |
75613521 | 2098 | */ |
7996a778 | 2099 | struct iscsi_cls_session * |
75613521 | 2100 | iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost, |
3cf7b233 | 2101 | uint16_t cmds_max, int cmd_task_size, |
7970634b | 2102 | uint32_t initial_cmdsn, unsigned int id) |
7996a778 | 2103 | { |
e5bd7b54 | 2104 | struct iscsi_host *ihost = shost_priv(shost); |
7996a778 MC |
2105 | struct iscsi_session *session; |
2106 | struct iscsi_cls_session *cls_session; | |
3cf7b233 | 2107 | int cmd_i, scsi_cmds, total_cmds = cmds_max; |
e5bd7b54 MC |
2108 | unsigned long flags; |
2109 | ||
2110 | spin_lock_irqsave(&ihost->lock, flags); | |
2111 | if (ihost->state == ISCSI_HOST_REMOVED) { | |
2112 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2113 | return NULL; | |
2114 | } | |
2115 | ihost->num_sessions++; | |
2116 | spin_unlock_irqrestore(&ihost->lock, flags); | |
8e9a20ce MC |
2117 | |
2118 | if (!total_cmds) | |
2119 | total_cmds = ISCSI_DEF_XMIT_CMDS_MAX; | |
3e5c28ad | 2120 | /* |
3cf7b233 MC |
2121 | * The iscsi layer needs some tasks for nop handling and tmfs, |
2122 | * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX | |
2123 | * + 1 command for scsi IO. | |
3e5c28ad | 2124 | */ |
3cf7b233 MC |
2125 | if (total_cmds < ISCSI_TOTAL_CMDS_MIN) { |
2126 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2127 | "must be a power of two that is at least %d.\n", | |
2128 | total_cmds, ISCSI_TOTAL_CMDS_MIN); | |
e5bd7b54 | 2129 | goto dec_session_count; |
3cf7b233 MC |
2130 | } |
2131 | ||
2132 | if (total_cmds > ISCSI_TOTAL_CMDS_MAX) { | |
2133 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2134 | "must be a power of 2 less than or equal to %d.\n", | |
2135 | cmds_max, ISCSI_TOTAL_CMDS_MAX); | |
2136 | total_cmds = ISCSI_TOTAL_CMDS_MAX; | |
2137 | } | |
2138 | ||
2139 | if (!is_power_of_2(total_cmds)) { | |
2140 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2141 | "must be a power of 2.\n", total_cmds); | |
2142 | total_cmds = rounddown_pow_of_two(total_cmds); | |
2143 | if (total_cmds < ISCSI_TOTAL_CMDS_MIN) | |
2144 | return NULL; | |
2145 | printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n", | |
2146 | total_cmds); | |
1548271e | 2147 | } |
3cf7b233 | 2148 | scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX; |
1548271e | 2149 | |
5d91e209 MC |
2150 | cls_session = iscsi_alloc_session(shost, iscsit, |
2151 | sizeof(struct iscsi_session)); | |
75613521 | 2152 | if (!cls_session) |
e5bd7b54 | 2153 | goto dec_session_count; |
75613521 MC |
2154 | session = cls_session->dd_data; |
2155 | session->cls_session = cls_session; | |
7996a778 MC |
2156 | session->host = shost; |
2157 | session->state = ISCSI_STATE_FREE; | |
f6d5180c | 2158 | session->fast_abort = 1; |
4cd49ea1 MC |
2159 | session->lu_reset_timeout = 15; |
2160 | session->abort_timeout = 10; | |
3cf7b233 MC |
2161 | session->scsi_cmds_max = scsi_cmds; |
2162 | session->cmds_max = total_cmds; | |
e0726407 | 2163 | session->queued_cmdsn = session->cmdsn = initial_cmdsn; |
7996a778 MC |
2164 | session->exp_cmdsn = initial_cmdsn + 1; |
2165 | session->max_cmdsn = initial_cmdsn + 1; | |
2166 | session->max_r2t = 1; | |
2167 | session->tt = iscsit; | |
6724add1 | 2168 | mutex_init(&session->eh_mutex); |
75613521 | 2169 | spin_lock_init(&session->lock); |
7996a778 MC |
2170 | |
2171 | /* initialize SCSI PDU commands pool */ | |
2172 | if (iscsi_pool_init(&session->cmdpool, session->cmds_max, | |
2173 | (void***)&session->cmds, | |
9c19a7d0 | 2174 | cmd_task_size + sizeof(struct iscsi_task))) |
7996a778 MC |
2175 | goto cmdpool_alloc_fail; |
2176 | ||
2177 | /* pre-format cmds pool with ITT */ | |
2178 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
9c19a7d0 | 2179 | struct iscsi_task *task = session->cmds[cmd_i]; |
7996a778 | 2180 | |
9c19a7d0 MC |
2181 | if (cmd_task_size) |
2182 | task->dd_data = &task[1]; | |
2183 | task->itt = cmd_i; | |
2184 | INIT_LIST_HEAD(&task->running); | |
7996a778 MC |
2185 | } |
2186 | ||
f53a88da | 2187 | if (!try_module_get(iscsit->owner)) |
75613521 | 2188 | goto module_get_fail; |
7996a778 | 2189 | |
7970634b | 2190 | if (iscsi_add_session(cls_session, id)) |
75613521 | 2191 | goto cls_session_fail; |
e5bd7b54 | 2192 | |
7996a778 MC |
2193 | return cls_session; |
2194 | ||
2195 | cls_session_fail: | |
75613521 MC |
2196 | module_put(iscsit->owner); |
2197 | module_get_fail: | |
6320377f | 2198 | iscsi_pool_free(&session->cmdpool); |
7996a778 | 2199 | cmdpool_alloc_fail: |
75613521 | 2200 | iscsi_free_session(cls_session); |
e5bd7b54 MC |
2201 | dec_session_count: |
2202 | iscsi_host_dec_session_cnt(shost); | |
7996a778 MC |
2203 | return NULL; |
2204 | } | |
2205 | EXPORT_SYMBOL_GPL(iscsi_session_setup); | |
2206 | ||
2207 | /** | |
2208 | * iscsi_session_teardown - destroy session, host, and cls_session | |
75613521 | 2209 | * @cls_session: iscsi session |
7996a778 | 2210 | * |
75613521 MC |
2211 | * The driver must have called iscsi_remove_session before |
2212 | * calling this. | |
2213 | */ | |
7996a778 MC |
2214 | void iscsi_session_teardown(struct iscsi_cls_session *cls_session) |
2215 | { | |
75613521 | 2216 | struct iscsi_session *session = cls_session->dd_data; |
63f75cc8 | 2217 | struct module *owner = cls_session->transport->owner; |
e5bd7b54 | 2218 | struct Scsi_Host *shost = session->host; |
7996a778 | 2219 | |
6320377f | 2220 | iscsi_pool_free(&session->cmdpool); |
7996a778 | 2221 | |
b2c64167 MC |
2222 | kfree(session->password); |
2223 | kfree(session->password_in); | |
2224 | kfree(session->username); | |
2225 | kfree(session->username_in); | |
f3ff0c36 | 2226 | kfree(session->targetname); |
88dfd340 MC |
2227 | kfree(session->initiatorname); |
2228 | kfree(session->ifacename); | |
f3ff0c36 | 2229 | |
75613521 | 2230 | iscsi_destroy_session(cls_session); |
e5bd7b54 | 2231 | iscsi_host_dec_session_cnt(shost); |
63f75cc8 | 2232 | module_put(owner); |
7996a778 MC |
2233 | } |
2234 | EXPORT_SYMBOL_GPL(iscsi_session_teardown); | |
2235 | ||
2236 | /** | |
2237 | * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn | |
2238 | * @cls_session: iscsi_cls_session | |
5d91e209 | 2239 | * @dd_size: private driver data size |
7996a778 | 2240 | * @conn_idx: cid |
5d91e209 | 2241 | */ |
7996a778 | 2242 | struct iscsi_cls_conn * |
5d91e209 MC |
2243 | iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size, |
2244 | uint32_t conn_idx) | |
7996a778 | 2245 | { |
75613521 | 2246 | struct iscsi_session *session = cls_session->dd_data; |
7996a778 MC |
2247 | struct iscsi_conn *conn; |
2248 | struct iscsi_cls_conn *cls_conn; | |
d36ab6f3 | 2249 | char *data; |
7996a778 | 2250 | |
5d91e209 MC |
2251 | cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size, |
2252 | conn_idx); | |
7996a778 MC |
2253 | if (!cls_conn) |
2254 | return NULL; | |
2255 | conn = cls_conn->dd_data; | |
5d91e209 | 2256 | memset(conn, 0, sizeof(*conn) + dd_size); |
7996a778 | 2257 | |
5d91e209 | 2258 | conn->dd_data = cls_conn->dd_data + sizeof(*conn); |
7996a778 MC |
2259 | conn->session = session; |
2260 | conn->cls_conn = cls_conn; | |
2261 | conn->c_stage = ISCSI_CONN_INITIAL_STAGE; | |
2262 | conn->id = conn_idx; | |
2263 | conn->exp_statsn = 0; | |
843c0a8a | 2264 | conn->tmf_state = TMF_INITIAL; |
f6d5180c MC |
2265 | |
2266 | init_timer(&conn->transport_timer); | |
2267 | conn->transport_timer.data = (unsigned long)conn; | |
2268 | conn->transport_timer.function = iscsi_check_transport_timeouts; | |
2269 | ||
7996a778 MC |
2270 | INIT_LIST_HEAD(&conn->run_list); |
2271 | INIT_LIST_HEAD(&conn->mgmt_run_list); | |
843c0a8a | 2272 | INIT_LIST_HEAD(&conn->mgmtqueue); |
b6c395ed | 2273 | INIT_LIST_HEAD(&conn->xmitqueue); |
843c0a8a | 2274 | INIT_LIST_HEAD(&conn->requeue); |
c4028958 | 2275 | INIT_WORK(&conn->xmitwork, iscsi_xmitworker); |
7996a778 | 2276 | |
9c19a7d0 | 2277 | /* allocate login_task used for the login/text sequences */ |
7996a778 | 2278 | spin_lock_bh(&session->lock); |
3e5c28ad | 2279 | if (!__kfifo_get(session->cmdpool.queue, |
9c19a7d0 | 2280 | (void*)&conn->login_task, |
7996a778 MC |
2281 | sizeof(void*))) { |
2282 | spin_unlock_bh(&session->lock); | |
9c19a7d0 | 2283 | goto login_task_alloc_fail; |
7996a778 MC |
2284 | } |
2285 | spin_unlock_bh(&session->lock); | |
2286 | ||
cfeb2cf9 MC |
2287 | data = (char *) __get_free_pages(GFP_KERNEL, |
2288 | get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); | |
d36ab6f3 | 2289 | if (!data) |
9c19a7d0 MC |
2290 | goto login_task_data_alloc_fail; |
2291 | conn->login_task->data = conn->data = data; | |
d36ab6f3 | 2292 | |
843c0a8a | 2293 | init_timer(&conn->tmf_timer); |
7996a778 MC |
2294 | init_waitqueue_head(&conn->ehwait); |
2295 | ||
2296 | return cls_conn; | |
2297 | ||
9c19a7d0 MC |
2298 | login_task_data_alloc_fail: |
2299 | __kfifo_put(session->cmdpool.queue, (void*)&conn->login_task, | |
d36ab6f3 | 2300 | sizeof(void*)); |
9c19a7d0 | 2301 | login_task_alloc_fail: |
7996a778 MC |
2302 | iscsi_destroy_conn(cls_conn); |
2303 | return NULL; | |
2304 | } | |
2305 | EXPORT_SYMBOL_GPL(iscsi_conn_setup); | |
2306 | ||
2307 | /** | |
2308 | * iscsi_conn_teardown - teardown iscsi connection | |
2309 | * cls_conn: iscsi class connection | |
2310 | * | |
2311 | * TODO: we may need to make this into a two step process | |
2312 | * like scsi-mls remove + put host | |
2313 | */ | |
2314 | void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) | |
2315 | { | |
2316 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2317 | struct iscsi_session *session = conn->session; | |
2318 | unsigned long flags; | |
2319 | ||
f6d5180c MC |
2320 | del_timer_sync(&conn->transport_timer); |
2321 | ||
7996a778 MC |
2322 | spin_lock_bh(&session->lock); |
2323 | conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; | |
2324 | if (session->leadconn == conn) { | |
2325 | /* | |
2326 | * leading connection? then give up on recovery. | |
2327 | */ | |
2328 | session->state = ISCSI_STATE_TERMINATE; | |
2329 | wake_up(&conn->ehwait); | |
2330 | } | |
2331 | spin_unlock_bh(&session->lock); | |
2332 | ||
7996a778 MC |
2333 | /* |
2334 | * Block until all in-progress commands for this connection | |
2335 | * time out or fail. | |
2336 | */ | |
2337 | for (;;) { | |
2338 | spin_lock_irqsave(session->host->host_lock, flags); | |
2339 | if (!session->host->host_busy) { /* OK for ERL == 0 */ | |
2340 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
2341 | break; | |
2342 | } | |
2343 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
2344 | msleep_interruptible(500); | |
322d739d MC |
2345 | iscsi_conn_printk(KERN_INFO, conn, "iscsi conn_destroy(): " |
2346 | "host_busy %d host_failed %d\n", | |
2347 | session->host->host_busy, | |
2348 | session->host->host_failed); | |
7996a778 MC |
2349 | /* |
2350 | * force eh_abort() to unblock | |
2351 | */ | |
2352 | wake_up(&conn->ehwait); | |
2353 | } | |
2354 | ||
779ea120 | 2355 | /* flush queued up work because we free the connection below */ |
843c0a8a | 2356 | iscsi_suspend_tx(conn); |
779ea120 | 2357 | |
7996a778 | 2358 | spin_lock_bh(&session->lock); |
cfeb2cf9 MC |
2359 | free_pages((unsigned long) conn->data, |
2360 | get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); | |
f3ff0c36 | 2361 | kfree(conn->persistent_address); |
9c19a7d0 | 2362 | __kfifo_put(session->cmdpool.queue, (void*)&conn->login_task, |
7996a778 | 2363 | sizeof(void*)); |
e0726407 | 2364 | if (session->leadconn == conn) |
7996a778 | 2365 | session->leadconn = NULL; |
7996a778 MC |
2366 | spin_unlock_bh(&session->lock); |
2367 | ||
7996a778 MC |
2368 | iscsi_destroy_conn(cls_conn); |
2369 | } | |
2370 | EXPORT_SYMBOL_GPL(iscsi_conn_teardown); | |
2371 | ||
2372 | int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) | |
2373 | { | |
2374 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2375 | struct iscsi_session *session = conn->session; | |
2376 | ||
ffd0436e | 2377 | if (!session) { |
322d739d MC |
2378 | iscsi_conn_printk(KERN_ERR, conn, |
2379 | "can't start unbound connection\n"); | |
7996a778 MC |
2380 | return -EPERM; |
2381 | } | |
2382 | ||
db98ccde MC |
2383 | if ((session->imm_data_en || !session->initial_r2t_en) && |
2384 | session->first_burst > session->max_burst) { | |
322d739d MC |
2385 | iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: " |
2386 | "first_burst %d max_burst %d\n", | |
2387 | session->first_burst, session->max_burst); | |
ffd0436e MC |
2388 | return -EINVAL; |
2389 | } | |
2390 | ||
f6d5180c | 2391 | if (conn->ping_timeout && !conn->recv_timeout) { |
322d739d MC |
2392 | iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of " |
2393 | "zero. Using 5 seconds\n."); | |
f6d5180c MC |
2394 | conn->recv_timeout = 5; |
2395 | } | |
2396 | ||
2397 | if (conn->recv_timeout && !conn->ping_timeout) { | |
322d739d MC |
2398 | iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of " |
2399 | "zero. Using 5 seconds.\n"); | |
f6d5180c MC |
2400 | conn->ping_timeout = 5; |
2401 | } | |
2402 | ||
7996a778 MC |
2403 | spin_lock_bh(&session->lock); |
2404 | conn->c_stage = ISCSI_CONN_STARTED; | |
2405 | session->state = ISCSI_STATE_LOGGED_IN; | |
e0726407 | 2406 | session->queued_cmdsn = session->cmdsn; |
7996a778 | 2407 | |
f6d5180c MC |
2408 | conn->last_recv = jiffies; |
2409 | conn->last_ping = jiffies; | |
2410 | if (conn->recv_timeout && conn->ping_timeout) | |
2411 | mod_timer(&conn->transport_timer, | |
2412 | jiffies + (conn->recv_timeout * HZ)); | |
2413 | ||
7996a778 MC |
2414 | switch(conn->stop_stage) { |
2415 | case STOP_CONN_RECOVER: | |
2416 | /* | |
2417 | * unblock eh_abort() if it is blocked. re-try all | |
2418 | * commands after successful recovery | |
2419 | */ | |
7996a778 | 2420 | conn->stop_stage = 0; |
843c0a8a | 2421 | conn->tmf_state = TMF_INITIAL; |
7996a778 | 2422 | session->age++; |
8b1d0343 MC |
2423 | if (session->age == 16) |
2424 | session->age = 0; | |
6eabafbe | 2425 | break; |
7996a778 | 2426 | case STOP_CONN_TERM: |
7996a778 | 2427 | conn->stop_stage = 0; |
7996a778 MC |
2428 | break; |
2429 | default: | |
2430 | break; | |
2431 | } | |
2432 | spin_unlock_bh(&session->lock); | |
2433 | ||
75613521 | 2434 | iscsi_unblock_session(session->cls_session); |
6eabafbe | 2435 | wake_up(&conn->ehwait); |
7996a778 MC |
2436 | return 0; |
2437 | } | |
2438 | EXPORT_SYMBOL_GPL(iscsi_conn_start); | |
2439 | ||
2440 | static void | |
2441 | flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn) | |
2442 | { | |
9c19a7d0 | 2443 | struct iscsi_task *task, *tmp; |
7996a778 MC |
2444 | |
2445 | /* handle pending */ | |
9c19a7d0 MC |
2446 | list_for_each_entry_safe(task, tmp, &conn->mgmtqueue, running) { |
2447 | debug_scsi("flushing pending mgmt task itt 0x%x\n", task->itt); | |
2448 | /* release ref from prep task */ | |
2449 | __iscsi_put_task(task); | |
7996a778 MC |
2450 | } |
2451 | ||
2452 | /* handle running */ | |
9c19a7d0 MC |
2453 | list_for_each_entry_safe(task, tmp, &conn->mgmt_run_list, running) { |
2454 | debug_scsi("flushing running mgmt task itt 0x%x\n", task->itt); | |
2455 | /* release ref from prep task */ | |
2456 | __iscsi_put_task(task); | |
7996a778 MC |
2457 | } |
2458 | ||
9c19a7d0 | 2459 | conn->task = NULL; |
7996a778 MC |
2460 | } |
2461 | ||
656cffc9 MC |
2462 | static void iscsi_start_session_recovery(struct iscsi_session *session, |
2463 | struct iscsi_conn *conn, int flag) | |
7996a778 | 2464 | { |
ed2abc7f MC |
2465 | int old_stop_stage; |
2466 | ||
f6d5180c MC |
2467 | del_timer_sync(&conn->transport_timer); |
2468 | ||
6724add1 | 2469 | mutex_lock(&session->eh_mutex); |
7996a778 | 2470 | spin_lock_bh(&session->lock); |
ed2abc7f | 2471 | if (conn->stop_stage == STOP_CONN_TERM) { |
7996a778 | 2472 | spin_unlock_bh(&session->lock); |
6724add1 MC |
2473 | mutex_unlock(&session->eh_mutex); |
2474 | return; | |
2475 | } | |
2476 | ||
ed2abc7f MC |
2477 | /* |
2478 | * When this is called for the in_login state, we only want to clean | |
9c19a7d0 | 2479 | * up the login task and connection. We do not need to block and set |
67a61114 | 2480 | * the recovery state again |
ed2abc7f | 2481 | */ |
67a61114 MC |
2482 | if (flag == STOP_CONN_TERM) |
2483 | session->state = ISCSI_STATE_TERMINATE; | |
2484 | else if (conn->stop_stage != STOP_CONN_RECOVER) | |
2485 | session->state = ISCSI_STATE_IN_RECOVERY; | |
ed2abc7f MC |
2486 | |
2487 | old_stop_stage = conn->stop_stage; | |
7996a778 | 2488 | conn->stop_stage = flag; |
67a61114 | 2489 | conn->c_stage = ISCSI_CONN_STOPPED; |
7996a778 | 2490 | spin_unlock_bh(&session->lock); |
6724add1 MC |
2491 | |
2492 | iscsi_suspend_tx(conn); | |
7996a778 MC |
2493 | /* |
2494 | * for connection level recovery we should not calculate | |
2495 | * header digest. conn->hdr_size used for optimization | |
2496 | * in hdr_extract() and will be re-negotiated at | |
2497 | * set_param() time. | |
2498 | */ | |
2499 | if (flag == STOP_CONN_RECOVER) { | |
2500 | conn->hdrdgst_en = 0; | |
2501 | conn->datadgst_en = 0; | |
656cffc9 | 2502 | if (session->state == ISCSI_STATE_IN_RECOVERY && |
67a61114 MC |
2503 | old_stop_stage != STOP_CONN_RECOVER) { |
2504 | debug_scsi("blocking session\n"); | |
75613521 | 2505 | iscsi_block_session(session->cls_session); |
67a61114 | 2506 | } |
7996a778 | 2507 | } |
656cffc9 | 2508 | |
656cffc9 MC |
2509 | /* |
2510 | * flush queues. | |
2511 | */ | |
2512 | spin_lock_bh(&session->lock); | |
87cd9eab | 2513 | if (flag == STOP_CONN_RECOVER) |
56d7fcfa MC |
2514 | fail_all_commands(conn, -1, DID_TRANSPORT_DISRUPTED); |
2515 | else | |
2516 | fail_all_commands(conn, -1, DID_ERROR); | |
656cffc9 MC |
2517 | flush_control_queues(session, conn); |
2518 | spin_unlock_bh(&session->lock); | |
6724add1 | 2519 | mutex_unlock(&session->eh_mutex); |
7996a778 | 2520 | } |
7996a778 MC |
2521 | |
2522 | void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
2523 | { | |
2524 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2525 | struct iscsi_session *session = conn->session; | |
2526 | ||
2527 | switch (flag) { | |
2528 | case STOP_CONN_RECOVER: | |
2529 | case STOP_CONN_TERM: | |
2530 | iscsi_start_session_recovery(session, conn, flag); | |
8d2860b3 | 2531 | break; |
7996a778 | 2532 | default: |
322d739d MC |
2533 | iscsi_conn_printk(KERN_ERR, conn, |
2534 | "invalid stop flag %d\n", flag); | |
7996a778 MC |
2535 | } |
2536 | } | |
2537 | EXPORT_SYMBOL_GPL(iscsi_conn_stop); | |
2538 | ||
2539 | int iscsi_conn_bind(struct iscsi_cls_session *cls_session, | |
2540 | struct iscsi_cls_conn *cls_conn, int is_leading) | |
2541 | { | |
75613521 | 2542 | struct iscsi_session *session = cls_session->dd_data; |
98644047 | 2543 | struct iscsi_conn *conn = cls_conn->dd_data; |
7996a778 | 2544 | |
7996a778 | 2545 | spin_lock_bh(&session->lock); |
7996a778 MC |
2546 | if (is_leading) |
2547 | session->leadconn = conn; | |
98644047 | 2548 | spin_unlock_bh(&session->lock); |
7996a778 MC |
2549 | |
2550 | /* | |
2551 | * Unblock xmitworker(), Login Phase will pass through. | |
2552 | */ | |
2553 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
2554 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
2555 | return 0; | |
2556 | } | |
2557 | EXPORT_SYMBOL_GPL(iscsi_conn_bind); | |
2558 | ||
a54a52ca MC |
2559 | |
2560 | int iscsi_set_param(struct iscsi_cls_conn *cls_conn, | |
2561 | enum iscsi_param param, char *buf, int buflen) | |
2562 | { | |
2563 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2564 | struct iscsi_session *session = conn->session; | |
2565 | uint32_t value; | |
2566 | ||
2567 | switch(param) { | |
843c0a8a MC |
2568 | case ISCSI_PARAM_FAST_ABORT: |
2569 | sscanf(buf, "%d", &session->fast_abort); | |
2570 | break; | |
f6d5180c MC |
2571 | case ISCSI_PARAM_ABORT_TMO: |
2572 | sscanf(buf, "%d", &session->abort_timeout); | |
2573 | break; | |
2574 | case ISCSI_PARAM_LU_RESET_TMO: | |
2575 | sscanf(buf, "%d", &session->lu_reset_timeout); | |
2576 | break; | |
2577 | case ISCSI_PARAM_PING_TMO: | |
2578 | sscanf(buf, "%d", &conn->ping_timeout); | |
2579 | break; | |
2580 | case ISCSI_PARAM_RECV_TMO: | |
2581 | sscanf(buf, "%d", &conn->recv_timeout); | |
2582 | break; | |
a54a52ca MC |
2583 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
2584 | sscanf(buf, "%d", &conn->max_recv_dlength); | |
2585 | break; | |
2586 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
2587 | sscanf(buf, "%d", &conn->max_xmit_dlength); | |
2588 | break; | |
2589 | case ISCSI_PARAM_HDRDGST_EN: | |
2590 | sscanf(buf, "%d", &conn->hdrdgst_en); | |
2591 | break; | |
2592 | case ISCSI_PARAM_DATADGST_EN: | |
2593 | sscanf(buf, "%d", &conn->datadgst_en); | |
2594 | break; | |
2595 | case ISCSI_PARAM_INITIAL_R2T_EN: | |
2596 | sscanf(buf, "%d", &session->initial_r2t_en); | |
2597 | break; | |
2598 | case ISCSI_PARAM_MAX_R2T: | |
2599 | sscanf(buf, "%d", &session->max_r2t); | |
2600 | break; | |
2601 | case ISCSI_PARAM_IMM_DATA_EN: | |
2602 | sscanf(buf, "%d", &session->imm_data_en); | |
2603 | break; | |
2604 | case ISCSI_PARAM_FIRST_BURST: | |
2605 | sscanf(buf, "%d", &session->first_burst); | |
2606 | break; | |
2607 | case ISCSI_PARAM_MAX_BURST: | |
2608 | sscanf(buf, "%d", &session->max_burst); | |
2609 | break; | |
2610 | case ISCSI_PARAM_PDU_INORDER_EN: | |
2611 | sscanf(buf, "%d", &session->pdu_inorder_en); | |
2612 | break; | |
2613 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
2614 | sscanf(buf, "%d", &session->dataseq_inorder_en); | |
2615 | break; | |
2616 | case ISCSI_PARAM_ERL: | |
2617 | sscanf(buf, "%d", &session->erl); | |
2618 | break; | |
2619 | case ISCSI_PARAM_IFMARKER_EN: | |
2620 | sscanf(buf, "%d", &value); | |
2621 | BUG_ON(value); | |
2622 | break; | |
2623 | case ISCSI_PARAM_OFMARKER_EN: | |
2624 | sscanf(buf, "%d", &value); | |
2625 | BUG_ON(value); | |
2626 | break; | |
2627 | case ISCSI_PARAM_EXP_STATSN: | |
2628 | sscanf(buf, "%u", &conn->exp_statsn); | |
2629 | break; | |
b2c64167 MC |
2630 | case ISCSI_PARAM_USERNAME: |
2631 | kfree(session->username); | |
2632 | session->username = kstrdup(buf, GFP_KERNEL); | |
2633 | if (!session->username) | |
2634 | return -ENOMEM; | |
2635 | break; | |
2636 | case ISCSI_PARAM_USERNAME_IN: | |
2637 | kfree(session->username_in); | |
2638 | session->username_in = kstrdup(buf, GFP_KERNEL); | |
2639 | if (!session->username_in) | |
2640 | return -ENOMEM; | |
2641 | break; | |
2642 | case ISCSI_PARAM_PASSWORD: | |
2643 | kfree(session->password); | |
2644 | session->password = kstrdup(buf, GFP_KERNEL); | |
2645 | if (!session->password) | |
2646 | return -ENOMEM; | |
2647 | break; | |
2648 | case ISCSI_PARAM_PASSWORD_IN: | |
2649 | kfree(session->password_in); | |
2650 | session->password_in = kstrdup(buf, GFP_KERNEL); | |
2651 | if (!session->password_in) | |
2652 | return -ENOMEM; | |
2653 | break; | |
a54a52ca MC |
2654 | case ISCSI_PARAM_TARGET_NAME: |
2655 | /* this should not change between logins */ | |
2656 | if (session->targetname) | |
2657 | break; | |
2658 | ||
2659 | session->targetname = kstrdup(buf, GFP_KERNEL); | |
2660 | if (!session->targetname) | |
2661 | return -ENOMEM; | |
2662 | break; | |
2663 | case ISCSI_PARAM_TPGT: | |
2664 | sscanf(buf, "%d", &session->tpgt); | |
2665 | break; | |
2666 | case ISCSI_PARAM_PERSISTENT_PORT: | |
2667 | sscanf(buf, "%d", &conn->persistent_port); | |
2668 | break; | |
2669 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
2670 | /* | |
2671 | * this is the address returned in discovery so it should | |
2672 | * not change between logins. | |
2673 | */ | |
2674 | if (conn->persistent_address) | |
2675 | break; | |
2676 | ||
2677 | conn->persistent_address = kstrdup(buf, GFP_KERNEL); | |
2678 | if (!conn->persistent_address) | |
2679 | return -ENOMEM; | |
2680 | break; | |
88dfd340 MC |
2681 | case ISCSI_PARAM_IFACE_NAME: |
2682 | if (!session->ifacename) | |
2683 | session->ifacename = kstrdup(buf, GFP_KERNEL); | |
2684 | break; | |
2685 | case ISCSI_PARAM_INITIATOR_NAME: | |
2686 | if (!session->initiatorname) | |
2687 | session->initiatorname = kstrdup(buf, GFP_KERNEL); | |
2688 | break; | |
a54a52ca MC |
2689 | default: |
2690 | return -ENOSYS; | |
2691 | } | |
2692 | ||
2693 | return 0; | |
2694 | } | |
2695 | EXPORT_SYMBOL_GPL(iscsi_set_param); | |
2696 | ||
2697 | int iscsi_session_get_param(struct iscsi_cls_session *cls_session, | |
2698 | enum iscsi_param param, char *buf) | |
2699 | { | |
75613521 | 2700 | struct iscsi_session *session = cls_session->dd_data; |
a54a52ca MC |
2701 | int len; |
2702 | ||
2703 | switch(param) { | |
843c0a8a MC |
2704 | case ISCSI_PARAM_FAST_ABORT: |
2705 | len = sprintf(buf, "%d\n", session->fast_abort); | |
2706 | break; | |
f6d5180c MC |
2707 | case ISCSI_PARAM_ABORT_TMO: |
2708 | len = sprintf(buf, "%d\n", session->abort_timeout); | |
2709 | break; | |
2710 | case ISCSI_PARAM_LU_RESET_TMO: | |
2711 | len = sprintf(buf, "%d\n", session->lu_reset_timeout); | |
2712 | break; | |
a54a52ca MC |
2713 | case ISCSI_PARAM_INITIAL_R2T_EN: |
2714 | len = sprintf(buf, "%d\n", session->initial_r2t_en); | |
2715 | break; | |
2716 | case ISCSI_PARAM_MAX_R2T: | |
2717 | len = sprintf(buf, "%hu\n", session->max_r2t); | |
2718 | break; | |
2719 | case ISCSI_PARAM_IMM_DATA_EN: | |
2720 | len = sprintf(buf, "%d\n", session->imm_data_en); | |
2721 | break; | |
2722 | case ISCSI_PARAM_FIRST_BURST: | |
2723 | len = sprintf(buf, "%u\n", session->first_burst); | |
2724 | break; | |
2725 | case ISCSI_PARAM_MAX_BURST: | |
2726 | len = sprintf(buf, "%u\n", session->max_burst); | |
2727 | break; | |
2728 | case ISCSI_PARAM_PDU_INORDER_EN: | |
2729 | len = sprintf(buf, "%d\n", session->pdu_inorder_en); | |
2730 | break; | |
2731 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
2732 | len = sprintf(buf, "%d\n", session->dataseq_inorder_en); | |
2733 | break; | |
2734 | case ISCSI_PARAM_ERL: | |
2735 | len = sprintf(buf, "%d\n", session->erl); | |
2736 | break; | |
2737 | case ISCSI_PARAM_TARGET_NAME: | |
2738 | len = sprintf(buf, "%s\n", session->targetname); | |
2739 | break; | |
2740 | case ISCSI_PARAM_TPGT: | |
2741 | len = sprintf(buf, "%d\n", session->tpgt); | |
2742 | break; | |
b2c64167 MC |
2743 | case ISCSI_PARAM_USERNAME: |
2744 | len = sprintf(buf, "%s\n", session->username); | |
2745 | break; | |
2746 | case ISCSI_PARAM_USERNAME_IN: | |
2747 | len = sprintf(buf, "%s\n", session->username_in); | |
2748 | break; | |
2749 | case ISCSI_PARAM_PASSWORD: | |
2750 | len = sprintf(buf, "%s\n", session->password); | |
2751 | break; | |
2752 | case ISCSI_PARAM_PASSWORD_IN: | |
2753 | len = sprintf(buf, "%s\n", session->password_in); | |
2754 | break; | |
88dfd340 MC |
2755 | case ISCSI_PARAM_IFACE_NAME: |
2756 | len = sprintf(buf, "%s\n", session->ifacename); | |
2757 | break; | |
2758 | case ISCSI_PARAM_INITIATOR_NAME: | |
2759 | if (!session->initiatorname) | |
2760 | len = sprintf(buf, "%s\n", "unknown"); | |
2761 | else | |
2762 | len = sprintf(buf, "%s\n", session->initiatorname); | |
2763 | break; | |
a54a52ca MC |
2764 | default: |
2765 | return -ENOSYS; | |
2766 | } | |
2767 | ||
2768 | return len; | |
2769 | } | |
2770 | EXPORT_SYMBOL_GPL(iscsi_session_get_param); | |
2771 | ||
2772 | int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, | |
2773 | enum iscsi_param param, char *buf) | |
2774 | { | |
2775 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2776 | int len; | |
2777 | ||
2778 | switch(param) { | |
f6d5180c MC |
2779 | case ISCSI_PARAM_PING_TMO: |
2780 | len = sprintf(buf, "%u\n", conn->ping_timeout); | |
2781 | break; | |
2782 | case ISCSI_PARAM_RECV_TMO: | |
2783 | len = sprintf(buf, "%u\n", conn->recv_timeout); | |
2784 | break; | |
a54a52ca MC |
2785 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
2786 | len = sprintf(buf, "%u\n", conn->max_recv_dlength); | |
2787 | break; | |
2788 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
2789 | len = sprintf(buf, "%u\n", conn->max_xmit_dlength); | |
2790 | break; | |
2791 | case ISCSI_PARAM_HDRDGST_EN: | |
2792 | len = sprintf(buf, "%d\n", conn->hdrdgst_en); | |
2793 | break; | |
2794 | case ISCSI_PARAM_DATADGST_EN: | |
2795 | len = sprintf(buf, "%d\n", conn->datadgst_en); | |
2796 | break; | |
2797 | case ISCSI_PARAM_IFMARKER_EN: | |
2798 | len = sprintf(buf, "%d\n", conn->ifmarker_en); | |
2799 | break; | |
2800 | case ISCSI_PARAM_OFMARKER_EN: | |
2801 | len = sprintf(buf, "%d\n", conn->ofmarker_en); | |
2802 | break; | |
2803 | case ISCSI_PARAM_EXP_STATSN: | |
2804 | len = sprintf(buf, "%u\n", conn->exp_statsn); | |
2805 | break; | |
2806 | case ISCSI_PARAM_PERSISTENT_PORT: | |
2807 | len = sprintf(buf, "%d\n", conn->persistent_port); | |
2808 | break; | |
2809 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
2810 | len = sprintf(buf, "%s\n", conn->persistent_address); | |
2811 | break; | |
2812 | default: | |
2813 | return -ENOSYS; | |
2814 | } | |
2815 | ||
2816 | return len; | |
2817 | } | |
2818 | EXPORT_SYMBOL_GPL(iscsi_conn_get_param); | |
2819 | ||
0801c242 MC |
2820 | int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param, |
2821 | char *buf) | |
2822 | { | |
75613521 | 2823 | struct iscsi_host *ihost = shost_priv(shost); |
0801c242 MC |
2824 | int len; |
2825 | ||
2826 | switch (param) { | |
d8196ed2 | 2827 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
75613521 | 2828 | if (!ihost->netdev) |
d8196ed2 MC |
2829 | len = sprintf(buf, "%s\n", "default"); |
2830 | else | |
75613521 | 2831 | len = sprintf(buf, "%s\n", ihost->netdev); |
d8196ed2 | 2832 | break; |
0801c242 | 2833 | case ISCSI_HOST_PARAM_HWADDRESS: |
75613521 | 2834 | if (!ihost->hwaddress) |
0801c242 MC |
2835 | len = sprintf(buf, "%s\n", "default"); |
2836 | else | |
75613521 | 2837 | len = sprintf(buf, "%s\n", ihost->hwaddress); |
0801c242 | 2838 | break; |
8ad5781a | 2839 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
75613521 | 2840 | if (!ihost->initiatorname) |
8ad5781a MC |
2841 | len = sprintf(buf, "%s\n", "unknown"); |
2842 | else | |
75613521 | 2843 | len = sprintf(buf, "%s\n", ihost->initiatorname); |
8ad5781a | 2844 | break; |
75613521 MC |
2845 | case ISCSI_HOST_PARAM_IPADDRESS: |
2846 | if (!strlen(ihost->local_address)) | |
2847 | len = sprintf(buf, "%s\n", "unknown"); | |
2848 | else | |
2849 | len = sprintf(buf, "%s\n", | |
2850 | ihost->local_address); | |
88dfd340 | 2851 | break; |
0801c242 MC |
2852 | default: |
2853 | return -ENOSYS; | |
2854 | } | |
2855 | ||
2856 | return len; | |
2857 | } | |
2858 | EXPORT_SYMBOL_GPL(iscsi_host_get_param); | |
2859 | ||
2860 | int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param, | |
2861 | char *buf, int buflen) | |
2862 | { | |
75613521 | 2863 | struct iscsi_host *ihost = shost_priv(shost); |
0801c242 MC |
2864 | |
2865 | switch (param) { | |
d8196ed2 | 2866 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
75613521 MC |
2867 | if (!ihost->netdev) |
2868 | ihost->netdev = kstrdup(buf, GFP_KERNEL); | |
d8196ed2 | 2869 | break; |
0801c242 | 2870 | case ISCSI_HOST_PARAM_HWADDRESS: |
75613521 MC |
2871 | if (!ihost->hwaddress) |
2872 | ihost->hwaddress = kstrdup(buf, GFP_KERNEL); | |
0801c242 | 2873 | break; |
8ad5781a | 2874 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
75613521 MC |
2875 | if (!ihost->initiatorname) |
2876 | ihost->initiatorname = kstrdup(buf, GFP_KERNEL); | |
8ad5781a | 2877 | break; |
0801c242 MC |
2878 | default: |
2879 | return -ENOSYS; | |
2880 | } | |
2881 | ||
2882 | return 0; | |
2883 | } | |
2884 | EXPORT_SYMBOL_GPL(iscsi_host_set_param); | |
2885 | ||
7996a778 MC |
2886 | MODULE_AUTHOR("Mike Christie"); |
2887 | MODULE_DESCRIPTION("iSCSI library functions"); | |
2888 | MODULE_LICENSE("GPL"); |