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Mike Christie7996a772006-04-06 21:13:41 -05001/*
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>
Mike Christie7996a772006-04-06 21:13:41 -050025#include <linux/kfifo.h>
26#include <linux/delay.h>
vignesh babu11836572007-12-13 12:43:41 -060027#include <linux/log2.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090028#include <linux/slab.h>
Paul Gortmakeracf3368f2011-05-27 09:47:43 -040029#include <linux/module.h>
Mike Christie8eb00532007-02-28 17:32:19 -060030#include <asm/unaligned.h>
Mike Christie7996a772006-04-06 21:13:41 -050031#include <net/tcp.h>
32#include <scsi/scsi_cmnd.h>
33#include <scsi/scsi_device.h>
34#include <scsi/scsi_eh.h>
35#include <scsi/scsi_tcq.h>
36#include <scsi/scsi_host.h>
37#include <scsi/scsi.h>
38#include <scsi/iscsi_proto.h>
39#include <scsi/scsi_transport.h>
40#include <scsi/scsi_transport_iscsi.h>
41#include <scsi/libiscsi.h>
42
Erez Zilberbd2199d2009-06-15 22:11:10 -050043static int iscsi_dbg_lib_conn;
44module_param_named(debug_libiscsi_conn, iscsi_dbg_lib_conn, int,
45 S_IRUGO | S_IWUSR);
46MODULE_PARM_DESC(debug_libiscsi_conn,
47 "Turn on debugging for connections in libiscsi module. "
48 "Set to 1 to turn on, and zero to turn off. Default is off.");
49
50static int iscsi_dbg_lib_session;
51module_param_named(debug_libiscsi_session, iscsi_dbg_lib_session, int,
52 S_IRUGO | S_IWUSR);
53MODULE_PARM_DESC(debug_libiscsi_session,
54 "Turn on debugging for sessions in libiscsi module. "
55 "Set to 1 to turn on, and zero to turn off. Default is off.");
56
57static int iscsi_dbg_lib_eh;
58module_param_named(debug_libiscsi_eh, iscsi_dbg_lib_eh, int,
59 S_IRUGO | S_IWUSR);
60MODULE_PARM_DESC(debug_libiscsi_eh,
61 "Turn on debugging for error handling in libiscsi module. "
62 "Set to 1 to turn on, and zero to turn off. Default is off.");
Mike Christie1b2c7af2009-03-05 14:45:58 -060063
64#define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \
65 do { \
Erez Zilberbd2199d2009-06-15 22:11:10 -050066 if (iscsi_dbg_lib_conn) \
Mike Christie1b2c7af2009-03-05 14:45:58 -060067 iscsi_conn_printk(KERN_INFO, _conn, \
68 "%s " dbg_fmt, \
69 __func__, ##arg); \
70 } while (0);
71
72#define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \
73 do { \
Erez Zilberbd2199d2009-06-15 22:11:10 -050074 if (iscsi_dbg_lib_session) \
75 iscsi_session_printk(KERN_INFO, _session, \
76 "%s " dbg_fmt, \
77 __func__, ##arg); \
78 } while (0);
79
80#define ISCSI_DBG_EH(_session, dbg_fmt, arg...) \
81 do { \
82 if (iscsi_dbg_lib_eh) \
Mike Christie1b2c7af2009-03-05 14:45:58 -060083 iscsi_session_printk(KERN_INFO, _session, \
84 "%s " dbg_fmt, \
85 __func__, ##arg); \
86 } while (0);
87
Mike Christie32ae7632009-03-05 14:46:03 -060088inline void iscsi_conn_queue_work(struct iscsi_conn *conn)
89{
90 struct Scsi_Host *shost = conn->session->host;
91 struct iscsi_host *ihost = shost_priv(shost);
92
Mike Christie1336aed2009-05-13 17:57:48 -050093 if (ihost->workq)
94 queue_work(ihost->workq, &conn->xmitwork);
Mike Christie32ae7632009-03-05 14:46:03 -060095}
96EXPORT_SYMBOL_GPL(iscsi_conn_queue_work);
97
Mike Christie4c0ba5d2009-09-05 07:34:23 +053098static void __iscsi_update_cmdsn(struct iscsi_session *session,
99 uint32_t exp_cmdsn, uint32_t max_cmdsn)
Mike Christie7996a772006-04-06 21:13:41 -0500100{
Mike Christie77a23c22007-05-30 12:57:18 -0500101 /*
102 * standard specifies this check for when to update expected and
103 * max sequence numbers
104 */
105 if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1))
106 return;
107
108 if (exp_cmdsn != session->exp_cmdsn &&
109 !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn))
Mike Christie7996a772006-04-06 21:13:41 -0500110 session->exp_cmdsn = exp_cmdsn;
111
Mike Christie77a23c22007-05-30 12:57:18 -0500112 if (max_cmdsn != session->max_cmdsn &&
113 !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) {
114 session->max_cmdsn = max_cmdsn;
115 /*
116 * if the window closed with IO queued, then kick the
117 * xmit thread
118 */
Mike Christie3bbaaad2009-05-13 17:57:46 -0500119 if (!list_empty(&session->leadconn->cmdqueue) ||
Mike Christie1336aed2009-05-13 17:57:48 -0500120 !list_empty(&session->leadconn->mgmtqueue))
121 iscsi_conn_queue_work(session->leadconn);
Mike Christie77a23c22007-05-30 12:57:18 -0500122 }
Mike Christie7996a772006-04-06 21:13:41 -0500123}
Mike Christie4c0ba5d2009-09-05 07:34:23 +0530124
125void iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
126{
127 __iscsi_update_cmdsn(session, be32_to_cpu(hdr->exp_cmdsn),
128 be32_to_cpu(hdr->max_cmdsn));
129}
Mike Christie77a23c22007-05-30 12:57:18 -0500130EXPORT_SYMBOL_GPL(iscsi_update_cmdsn);
Mike Christie7996a772006-04-06 21:13:41 -0500131
Mike Christie577577d2008-12-02 00:32:05 -0600132/**
133 * iscsi_prep_data_out_pdu - initialize Data-Out
134 * @task: scsi command task
135 * @r2t: R2T info
136 * @hdr: iscsi data in pdu
137 *
138 * Notes:
139 * Initialize Data-Out within this R2T sequence and finds
140 * proper data_offset within this SCSI command.
141 *
142 * This function is called with connection lock taken.
143 **/
144void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t,
145 struct iscsi_data *hdr)
Mike Christie7996a772006-04-06 21:13:41 -0500146{
Mike Christie9c19a7d2008-05-21 15:54:09 -0500147 struct iscsi_conn *conn = task->conn;
Mike Christie577577d2008-12-02 00:32:05 -0600148 unsigned int left = r2t->data_length - r2t->sent;
149
150 task->hdr_len = sizeof(struct iscsi_data);
Mike Christie7996a772006-04-06 21:13:41 -0500151
152 memset(hdr, 0, sizeof(struct iscsi_data));
Mike Christie577577d2008-12-02 00:32:05 -0600153 hdr->ttt = r2t->ttt;
154 hdr->datasn = cpu_to_be32(r2t->datasn);
155 r2t->datasn++;
Mike Christie7996a772006-04-06 21:13:41 -0500156 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
Andy Grover55bdabd2011-06-16 15:57:09 -0700157 hdr->lun = task->lun;
Mike Christie577577d2008-12-02 00:32:05 -0600158 hdr->itt = task->hdr_itt;
159 hdr->exp_statsn = r2t->exp_statsn;
160 hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent);
161 if (left > conn->max_xmit_dlength) {
Mike Christie7996a772006-04-06 21:13:41 -0500162 hton24(hdr->dlength, conn->max_xmit_dlength);
Mike Christie577577d2008-12-02 00:32:05 -0600163 r2t->data_count = conn->max_xmit_dlength;
Mike Christie7996a772006-04-06 21:13:41 -0500164 hdr->flags = 0;
165 } else {
Mike Christie577577d2008-12-02 00:32:05 -0600166 hton24(hdr->dlength, left);
167 r2t->data_count = left;
Mike Christie7996a772006-04-06 21:13:41 -0500168 hdr->flags = ISCSI_FLAG_CMD_FINAL;
169 }
Mike Christie577577d2008-12-02 00:32:05 -0600170 conn->dataout_pdus_cnt++;
Mike Christie7996a772006-04-06 21:13:41 -0500171}
Mike Christie577577d2008-12-02 00:32:05 -0600172EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu);
Mike Christie7996a772006-04-06 21:13:41 -0500173
Mike Christie9c19a7d2008-05-21 15:54:09 -0500174static int iscsi_add_hdr(struct iscsi_task *task, unsigned len)
Boaz Harrosh004d6532007-12-13 12:43:23 -0600175{
Mike Christie9c19a7d2008-05-21 15:54:09 -0500176 unsigned exp_len = task->hdr_len + len;
Boaz Harrosh004d6532007-12-13 12:43:23 -0600177
Mike Christie9c19a7d2008-05-21 15:54:09 -0500178 if (exp_len > task->hdr_max) {
Boaz Harrosh004d6532007-12-13 12:43:23 -0600179 WARN_ON(1);
180 return -EINVAL;
181 }
182
183 WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */
Mike Christie9c19a7d2008-05-21 15:54:09 -0500184 task->hdr_len = exp_len;
Boaz Harrosh004d6532007-12-13 12:43:23 -0600185 return 0;
186}
187
Boaz Harrosh38d1c062008-04-18 10:11:51 -0500188/*
189 * make an extended cdb AHS
190 */
Mike Christie9c19a7d2008-05-21 15:54:09 -0500191static int iscsi_prep_ecdb_ahs(struct iscsi_task *task)
Boaz Harrosh38d1c062008-04-18 10:11:51 -0500192{
Mike Christie9c19a7d2008-05-21 15:54:09 -0500193 struct scsi_cmnd *cmd = task->sc;
Boaz Harrosh38d1c062008-04-18 10:11:51 -0500194 unsigned rlen, pad_len;
195 unsigned short ahslength;
196 struct iscsi_ecdb_ahdr *ecdb_ahdr;
197 int rc;
198
Mike Christie9c19a7d2008-05-21 15:54:09 -0500199 ecdb_ahdr = iscsi_next_hdr(task);
Boaz Harrosh38d1c062008-04-18 10:11:51 -0500200 rlen = cmd->cmd_len - ISCSI_CDB_SIZE;
201
202 BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb));
203 ahslength = rlen + sizeof(ecdb_ahdr->reserved);
204
205 pad_len = iscsi_padding(rlen);
206
Mike Christie9c19a7d2008-05-21 15:54:09 -0500207 rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) +
Boaz Harrosh38d1c062008-04-18 10:11:51 -0500208 sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len);
209 if (rc)
210 return rc;
211
212 if (pad_len)
213 memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len);
214
215 ecdb_ahdr->ahslength = cpu_to_be16(ahslength);
216 ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB;
217 ecdb_ahdr->reserved = 0;
218 memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen);
219
Mike Christie1b2c7af2009-03-05 14:45:58 -0600220 ISCSI_DBG_SESSION(task->conn->session,
221 "iscsi_prep_ecdb_ahs: varlen_cdb_len %d "
222 "rlen %d pad_len %d ahs_length %d iscsi_headers_size "
223 "%u\n", cmd->cmd_len, rlen, pad_len, ahslength,
224 task->hdr_len);
Boaz Harrosh38d1c062008-04-18 10:11:51 -0500225 return 0;
226}
227
Mike Christie9c19a7d2008-05-21 15:54:09 -0500228static int iscsi_prep_bidi_ahs(struct iscsi_task *task)
Boaz Harroshc07d4442008-04-18 10:11:52 -0500229{
Mike Christie9c19a7d2008-05-21 15:54:09 -0500230 struct scsi_cmnd *sc = task->sc;
Boaz Harroshc07d4442008-04-18 10:11:52 -0500231 struct iscsi_rlength_ahdr *rlen_ahdr;
232 int rc;
233
Mike Christie9c19a7d2008-05-21 15:54:09 -0500234 rlen_ahdr = iscsi_next_hdr(task);
235 rc = iscsi_add_hdr(task, sizeof(*rlen_ahdr));
Boaz Harroshc07d4442008-04-18 10:11:52 -0500236 if (rc)
237 return rc;
238
239 rlen_ahdr->ahslength =
240 cpu_to_be16(sizeof(rlen_ahdr->read_length) +
241 sizeof(rlen_ahdr->reserved));
242 rlen_ahdr->ahstype = ISCSI_AHSTYPE_RLENGTH;
243 rlen_ahdr->reserved = 0;
244 rlen_ahdr->read_length = cpu_to_be32(scsi_in(sc)->length);
245
Mike Christie1b2c7af2009-03-05 14:45:58 -0600246 ISCSI_DBG_SESSION(task->conn->session,
247 "bidi-in rlen_ahdr->read_length(%d) "
248 "rlen_ahdr->ahslength(%d)\n",
249 be32_to_cpu(rlen_ahdr->read_length),
250 be16_to_cpu(rlen_ahdr->ahslength));
Boaz Harroshc07d4442008-04-18 10:11:52 -0500251 return 0;
252}
253
Mike Christie7996a772006-04-06 21:13:41 -0500254/**
Mike Christie5d12c052009-11-11 16:34:32 -0600255 * iscsi_check_tmf_restrictions - check if a task is affected by TMF
256 * @task: iscsi task
257 * @opcode: opcode to check for
258 *
259 * During TMF a task has to be checked if it's affected.
260 * All unrelated I/O can be passed through, but I/O to the
261 * affected LUN should be restricted.
262 * If 'fast_abort' is set we won't be sending any I/O to the
263 * affected LUN.
264 * Otherwise the target is waiting for all TTTs to be completed,
265 * so we have to send all outstanding Data-Out PDUs to the target.
266 */
267static int iscsi_check_tmf_restrictions(struct iscsi_task *task, int opcode)
268{
269 struct iscsi_conn *conn = task->conn;
270 struct iscsi_tm *tmf = &conn->tmhdr;
271 unsigned int hdr_lun;
272
273 if (conn->tmf_state == TMF_INITIAL)
274 return 0;
275
276 if ((tmf->opcode & ISCSI_OPCODE_MASK) != ISCSI_OP_SCSI_TMFUNC)
277 return 0;
278
279 switch (ISCSI_TM_FUNC_VALUE(tmf)) {
280 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
281 /*
282 * Allow PDUs for unrelated LUNs
283 */
Andy Grover55bdabd2011-06-16 15:57:09 -0700284 hdr_lun = scsilun_to_int(&tmf->lun);
Mike Christie5d12c052009-11-11 16:34:32 -0600285 if (hdr_lun != task->sc->device->lun)
286 return 0;
Mike Christie3fe5ae82009-11-11 16:34:33 -0600287 /* fall through */
288 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
Mike Christie5d12c052009-11-11 16:34:32 -0600289 /*
290 * Fail all SCSI cmd PDUs
291 */
292 if (opcode != ISCSI_OP_SCSI_DATA_OUT) {
293 iscsi_conn_printk(KERN_INFO, conn,
294 "task [op %x/%x itt "
Mike Christie3fe5ae82009-11-11 16:34:33 -0600295 "0x%x/0x%x] "
Mike Christie5d12c052009-11-11 16:34:32 -0600296 "rejected.\n",
297 task->hdr->opcode, opcode,
Mike Christie3fe5ae82009-11-11 16:34:33 -0600298 task->itt, task->hdr_itt);
Mike Christie5d12c052009-11-11 16:34:32 -0600299 return -EACCES;
300 }
301 /*
302 * And also all data-out PDUs in response to R2T
303 * if fast_abort is set.
304 */
305 if (conn->session->fast_abort) {
306 iscsi_conn_printk(KERN_INFO, conn,
307 "task [op %x/%x itt "
Mike Christie3fe5ae82009-11-11 16:34:33 -0600308 "0x%x/0x%x] fast abort.\n",
Mike Christie5d12c052009-11-11 16:34:32 -0600309 task->hdr->opcode, opcode,
Mike Christie3fe5ae82009-11-11 16:34:33 -0600310 task->itt, task->hdr_itt);
Mike Christie5d12c052009-11-11 16:34:32 -0600311 return -EACCES;
312 }
313 break;
314 case ISCSI_TM_FUNC_ABORT_TASK:
315 /*
316 * the caller has already checked if the task
317 * they want to abort was in the pending queue so if
318 * we are here the cmd pdu has gone out already, and
319 * we will only hit this for data-outs
320 */
321 if (opcode == ISCSI_OP_SCSI_DATA_OUT &&
322 task->hdr_itt == tmf->rtt) {
323 ISCSI_DBG_SESSION(conn->session,
324 "Preventing task %x/%x from sending "
325 "data-out due to abort task in "
326 "progress\n", task->itt,
327 task->hdr_itt);
328 return -EACCES;
329 }
330 break;
331 }
332
333 return 0;
334}
335
336/**
Mike Christie7996a772006-04-06 21:13:41 -0500337 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
Mike Christie9c19a7d2008-05-21 15:54:09 -0500338 * @task: iscsi task
Mike Christie7996a772006-04-06 21:13:41 -0500339 *
340 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
341 * fields like dlength or final based on how much data it sends
342 */
Mike Christie9c19a7d2008-05-21 15:54:09 -0500343static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
Mike Christie7996a772006-04-06 21:13:41 -0500344{
Mike Christie9c19a7d2008-05-21 15:54:09 -0500345 struct iscsi_conn *conn = task->conn;
Mike Christie7996a772006-04-06 21:13:41 -0500346 struct iscsi_session *session = conn->session;
Mike Christie9c19a7d2008-05-21 15:54:09 -0500347 struct scsi_cmnd *sc = task->sc;
Nicholas Bellinger12352182011-05-27 11:16:33 +0000348 struct iscsi_scsi_req *hdr;
Boaz Harrosh38d1c062008-04-18 10:11:51 -0500349 unsigned hdrlength, cmd_len;
Mike Christie262ef632008-12-02 00:32:13 -0600350 itt_t itt;
Boaz Harrosh004d6532007-12-13 12:43:23 -0600351 int rc;
Mike Christie7996a772006-04-06 21:13:41 -0500352
Mike Christie5d12c052009-11-11 16:34:32 -0600353 rc = iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_CMD);
354 if (rc)
355 return rc;
356
Mike Christie184b57c2009-05-13 17:57:39 -0500357 if (conn->session->tt->alloc_pdu) {
358 rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD);
359 if (rc)
360 return rc;
361 }
Nicholas Bellinger12352182011-05-27 11:16:33 +0000362 hdr = (struct iscsi_scsi_req *)task->hdr;
Mike Christie262ef632008-12-02 00:32:13 -0600363 itt = hdr->itt;
Mike Christie577577d2008-12-02 00:32:05 -0600364 memset(hdr, 0, sizeof(*hdr));
365
Mike Christie2ff79d52008-12-02 00:32:14 -0600366 if (session->tt->parse_pdu_itt)
367 hdr->itt = task->hdr_itt = itt;
368 else
369 hdr->itt = task->hdr_itt = build_itt(task->itt,
370 task->conn->session->age);
Mike Christie9c19a7d2008-05-21 15:54:09 -0500371 task->hdr_len = 0;
372 rc = iscsi_add_hdr(task, sizeof(*hdr));
Boaz Harrosh004d6532007-12-13 12:43:23 -0600373 if (rc)
374 return rc;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600375 hdr->opcode = ISCSI_OP_SCSI_CMD;
376 hdr->flags = ISCSI_ATTR_SIMPLE;
Andy Grover55bdabd2011-06-16 15:57:09 -0700377 int_to_scsilun(sc->device->lun, &hdr->lun);
378 task->lun = hdr->lun;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600379 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
Boaz Harrosh38d1c062008-04-18 10:11:51 -0500380 cmd_len = sc->cmd_len;
381 if (cmd_len < ISCSI_CDB_SIZE)
382 memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len);
383 else if (cmd_len > ISCSI_CDB_SIZE) {
Mike Christie9c19a7d2008-05-21 15:54:09 -0500384 rc = iscsi_prep_ecdb_ahs(task);
Boaz Harrosh38d1c062008-04-18 10:11:51 -0500385 if (rc)
386 return rc;
387 cmd_len = ISCSI_CDB_SIZE;
388 }
389 memcpy(hdr->cdb, sc->cmnd, cmd_len);
Mike Christie7996a772006-04-06 21:13:41 -0500390
Mike Christie9c19a7d2008-05-21 15:54:09 -0500391 task->imm_count = 0;
Boaz Harroshc07d4442008-04-18 10:11:52 -0500392 if (scsi_bidi_cmnd(sc)) {
393 hdr->flags |= ISCSI_FLAG_CMD_READ;
Mike Christie9c19a7d2008-05-21 15:54:09 -0500394 rc = iscsi_prep_bidi_ahs(task);
Boaz Harroshc07d4442008-04-18 10:11:52 -0500395 if (rc)
396 return rc;
397 }
Mike Christie7996a772006-04-06 21:13:41 -0500398 if (sc->sc_data_direction == DMA_TO_DEVICE) {
Boaz Harroshc07d4442008-04-18 10:11:52 -0500399 unsigned out_len = scsi_out(sc)->length;
Mike Christie577577d2008-12-02 00:32:05 -0600400 struct iscsi_r2t_info *r2t = &task->unsol_r2t;
401
Boaz Harroshc07d4442008-04-18 10:11:52 -0500402 hdr->data_length = cpu_to_be32(out_len);
Mike Christie7996a772006-04-06 21:13:41 -0500403 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
404 /*
405 * Write counters:
406 *
407 * imm_count bytes to be sent right after
408 * SCSI PDU Header
409 *
410 * unsol_count bytes(as Data-Out) to be sent
411 * without R2T ack right after
412 * immediate data
413 *
Mike Christie577577d2008-12-02 00:32:05 -0600414 * r2t data_length bytes to be sent via R2T ack's
Mike Christie7996a772006-04-06 21:13:41 -0500415 *
416 * pad_count bytes to be sent as zero-padding
417 */
Mike Christie577577d2008-12-02 00:32:05 -0600418 memset(r2t, 0, sizeof(*r2t));
Mike Christie7996a772006-04-06 21:13:41 -0500419
420 if (session->imm_data_en) {
Boaz Harroshc07d4442008-04-18 10:11:52 -0500421 if (out_len >= session->first_burst)
Mike Christie9c19a7d2008-05-21 15:54:09 -0500422 task->imm_count = min(session->first_burst,
Mike Christie7996a772006-04-06 21:13:41 -0500423 conn->max_xmit_dlength);
424 else
Mike Christie9c19a7d2008-05-21 15:54:09 -0500425 task->imm_count = min(out_len,
Mike Christie7996a772006-04-06 21:13:41 -0500426 conn->max_xmit_dlength);
Mike Christie9c19a7d2008-05-21 15:54:09 -0500427 hton24(hdr->dlength, task->imm_count);
Mike Christie7996a772006-04-06 21:13:41 -0500428 } else
Olaf Kircha8ac6312007-12-13 12:43:35 -0600429 zero_data(hdr->dlength);
Mike Christie7996a772006-04-06 21:13:41 -0500430
Mike Christieffd04362006-08-31 18:09:24 -0400431 if (!session->initial_r2t_en) {
Mike Christie577577d2008-12-02 00:32:05 -0600432 r2t->data_length = min(session->first_burst, out_len) -
433 task->imm_count;
434 r2t->data_offset = task->imm_count;
435 r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
436 r2t->exp_statsn = cpu_to_be32(conn->exp_statsn);
Mike Christieffd04362006-08-31 18:09:24 -0400437 }
438
Mike Christie577577d2008-12-02 00:32:05 -0600439 if (!task->unsol_r2t.data_length)
Mike Christie7996a772006-04-06 21:13:41 -0500440 /* No unsolicit Data-Out's */
Olaf Kircha8ac6312007-12-13 12:43:35 -0600441 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
Mike Christie7996a772006-04-06 21:13:41 -0500442 } else {
Mike Christie7996a772006-04-06 21:13:41 -0500443 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
444 zero_data(hdr->dlength);
Boaz Harroshc07d4442008-04-18 10:11:52 -0500445 hdr->data_length = cpu_to_be32(scsi_in(sc)->length);
Mike Christie7996a772006-04-06 21:13:41 -0500446
447 if (sc->sc_data_direction == DMA_FROM_DEVICE)
448 hdr->flags |= ISCSI_FLAG_CMD_READ;
449 }
450
Boaz Harrosh004d6532007-12-13 12:43:23 -0600451 /* calculate size of additional header segments (AHSs) */
Mike Christie9c19a7d2008-05-21 15:54:09 -0500452 hdrlength = task->hdr_len - sizeof(*hdr);
Boaz Harrosh004d6532007-12-13 12:43:23 -0600453
454 WARN_ON(hdrlength & (ISCSI_PAD_LEN-1));
455 hdrlength /= ISCSI_PAD_LEN;
456
457 WARN_ON(hdrlength >= 256);
458 hdr->hlength = hdrlength & 0xFF;
Mike Christie96b1f962010-04-24 16:21:19 -0500459 hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn);
Boaz Harrosh004d6532007-12-13 12:43:23 -0600460
Mike Christie577577d2008-12-02 00:32:05 -0600461 if (session->tt->init_task && session->tt->init_task(task))
Mike Christie052d0142008-05-21 15:54:05 -0500462 return -EIO;
463
Mike Christie9c19a7d2008-05-21 15:54:09 -0500464 task->state = ISCSI_TASK_RUNNING;
Mike Christied3305f32009-08-20 15:10:58 -0500465 session->cmdsn++;
Mike Christie77a23c22007-05-30 12:57:18 -0500466
Olaf Kircha8ac6312007-12-13 12:43:35 -0600467 conn->scsicmd_pdus_cnt++;
Mike Christie1b2c7af2009-03-05 14:45:58 -0600468 ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x "
469 "itt 0x%x len %d bidi_len %d cmdsn %d win %d]\n",
470 scsi_bidi_cmnd(sc) ? "bidirectional" :
471 sc->sc_data_direction == DMA_TO_DEVICE ?
472 "write" : "read", conn->id, sc, sc->cmnd[0],
473 task->itt, scsi_bufflen(sc),
474 scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0,
475 session->cmdsn,
476 session->max_cmdsn - session->exp_cmdsn + 1);
Boaz Harrosh004d6532007-12-13 12:43:23 -0600477 return 0;
Mike Christie7996a772006-04-06 21:13:41 -0500478}
Mike Christie7996a772006-04-06 21:13:41 -0500479
480/**
Mike Christie3bbaaad2009-05-13 17:57:46 -0500481 * iscsi_free_task - free a task
Mike Christie9c19a7d2008-05-21 15:54:09 -0500482 * @task: iscsi cmd task
Mike Christie7996a772006-04-06 21:13:41 -0500483 *
484 * Must be called with session lock.
Mike Christie3e5c28a2008-05-21 15:54:06 -0500485 * This function returns the scsi command to scsi-ml or cleans
486 * up mgmt tasks then returns the task to the pool.
Mike Christie7996a772006-04-06 21:13:41 -0500487 */
Mike Christie3bbaaad2009-05-13 17:57:46 -0500488static void iscsi_free_task(struct iscsi_task *task)
Mike Christie7996a772006-04-06 21:13:41 -0500489{
Mike Christie9c19a7d2008-05-21 15:54:09 -0500490 struct iscsi_conn *conn = task->conn;
Mike Christiec1635cb2007-12-13 12:43:33 -0600491 struct iscsi_session *session = conn->session;
Mike Christie9c19a7d2008-05-21 15:54:09 -0500492 struct scsi_cmnd *sc = task->sc;
Mike Christief41d4722010-12-31 02:22:21 -0600493 int oldstate = task->state;
Mike Christie7996a772006-04-06 21:13:41 -0500494
Mike Christie4421c9e2009-05-13 17:57:50 -0500495 ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n",
496 task->itt, task->state, task->sc);
497
Mike Christie577577d2008-12-02 00:32:05 -0600498 session->tt->cleanup_task(task);
Mike Christie3bbaaad2009-05-13 17:57:46 -0500499 task->state = ISCSI_TASK_FREE;
Mike Christie9c19a7d2008-05-21 15:54:09 -0500500 task->sc = NULL;
Mike Christie3e5c28a2008-05-21 15:54:06 -0500501 /*
Mike Christie9c19a7d2008-05-21 15:54:09 -0500502 * login task is preallocated so do not free
Mike Christie3e5c28a2008-05-21 15:54:06 -0500503 */
Mike Christie9c19a7d2008-05-21 15:54:09 -0500504 if (conn->login_task == task)
Mike Christie3e5c28a2008-05-21 15:54:06 -0500505 return;
506
Stefani Seibold7acd72e2009-12-21 14:37:28 -0800507 kfifo_in(&session->cmdpool.queue, (void*)&task, sizeof(void*));
Mike Christie052d0142008-05-21 15:54:05 -0500508
Mike Christie3e5c28a2008-05-21 15:54:06 -0500509 if (sc) {
Mike Christie3e5c28a2008-05-21 15:54:06 -0500510 /* SCSI eh reuses commands to verify us */
511 sc->SCp.ptr = NULL;
512 /*
Mike Christief41d4722010-12-31 02:22:21 -0600513 * queue command may call this to free the task, so
514 * it will decide how to return sc to scsi-ml.
Mike Christie3e5c28a2008-05-21 15:54:06 -0500515 */
Mike Christief41d4722010-12-31 02:22:21 -0600516 if (oldstate != ISCSI_TASK_REQUEUE_SCSIQ)
Mike Christie3e5c28a2008-05-21 15:54:06 -0500517 sc->scsi_done(sc);
518 }
Mike Christie7996a772006-04-06 21:13:41 -0500519}
520
Mike Christie913e5bf2008-05-21 15:54:18 -0500521void __iscsi_get_task(struct iscsi_task *task)
Mike Christie60ecebf2006-08-31 18:09:25 -0400522{
Mike Christie9c19a7d2008-05-21 15:54:09 -0500523 atomic_inc(&task->refcount);
Mike Christie60ecebf2006-08-31 18:09:25 -0400524}
Mike Christie913e5bf2008-05-21 15:54:18 -0500525EXPORT_SYMBOL_GPL(__iscsi_get_task);
Mike Christie60ecebf2006-08-31 18:09:25 -0400526
Eddie Wai8eea2f52010-11-23 15:29:21 -0800527void __iscsi_put_task(struct iscsi_task *task)
Mike Christie60ecebf2006-08-31 18:09:25 -0400528{
Mike Christie9c19a7d2008-05-21 15:54:09 -0500529 if (atomic_dec_and_test(&task->refcount))
Mike Christie3bbaaad2009-05-13 17:57:46 -0500530 iscsi_free_task(task);
Mike Christie60ecebf2006-08-31 18:09:25 -0400531}
Eddie Wai8eea2f52010-11-23 15:29:21 -0800532EXPORT_SYMBOL_GPL(__iscsi_put_task);
Mike Christie60ecebf2006-08-31 18:09:25 -0400533
Mike Christie9c19a7d2008-05-21 15:54:09 -0500534void iscsi_put_task(struct iscsi_task *task)
Mike Christie3e5c28a2008-05-21 15:54:06 -0500535{
Mike Christie9c19a7d2008-05-21 15:54:09 -0500536 struct iscsi_session *session = task->conn->session;
Mike Christie3e5c28a2008-05-21 15:54:06 -0500537
538 spin_lock_bh(&session->lock);
Mike Christie9c19a7d2008-05-21 15:54:09 -0500539 __iscsi_put_task(task);
Mike Christie3e5c28a2008-05-21 15:54:06 -0500540 spin_unlock_bh(&session->lock);
541}
Mike Christie9c19a7d2008-05-21 15:54:09 -0500542EXPORT_SYMBOL_GPL(iscsi_put_task);
Mike Christie3e5c28a2008-05-21 15:54:06 -0500543
Mike Christie3bbaaad2009-05-13 17:57:46 -0500544/**
545 * iscsi_complete_task - finish a task
546 * @task: iscsi cmd task
Mike Christieb3cd5052009-05-13 17:57:49 -0500547 * @state: state to complete task with
Mike Christie3bbaaad2009-05-13 17:57:46 -0500548 *
549 * Must be called with session lock.
Mike Christieb3a7ea82007-12-13 12:43:26 -0600550 */
Mike Christieb3cd5052009-05-13 17:57:49 -0500551static void iscsi_complete_task(struct iscsi_task *task, int state)
Mike Christieb3a7ea82007-12-13 12:43:26 -0600552{
Mike Christie3bbaaad2009-05-13 17:57:46 -0500553 struct iscsi_conn *conn = task->conn;
554
Mike Christie4421c9e2009-05-13 17:57:50 -0500555 ISCSI_DBG_SESSION(conn->session,
556 "complete task itt 0x%x state %d sc %p\n",
557 task->itt, task->state, task->sc);
Mike Christieb3cd5052009-05-13 17:57:49 -0500558 if (task->state == ISCSI_TASK_COMPLETED ||
559 task->state == ISCSI_TASK_ABRT_TMF ||
Mike Christief41d4722010-12-31 02:22:21 -0600560 task->state == ISCSI_TASK_ABRT_SESS_RECOV ||
561 task->state == ISCSI_TASK_REQUEUE_SCSIQ)
Mike Christie3bbaaad2009-05-13 17:57:46 -0500562 return;
563 WARN_ON_ONCE(task->state == ISCSI_TASK_FREE);
Mike Christieb3cd5052009-05-13 17:57:49 -0500564 task->state = state;
Mike Christie3bbaaad2009-05-13 17:57:46 -0500565
566 if (!list_empty(&task->running))
567 list_del_init(&task->running);
568
569 if (conn->task == task)
570 conn->task = NULL;
571
572 if (conn->ping_task == task)
573 conn->ping_task = NULL;
574
575 /* release get from queueing */
576 __iscsi_put_task(task);
577}
578
Mike Christie4c0ba5d2009-09-05 07:34:23 +0530579/**
580 * iscsi_complete_scsi_task - finish scsi task normally
581 * @task: iscsi task for scsi cmd
582 * @exp_cmdsn: expected cmd sn in cpu format
583 * @max_cmdsn: max cmd sn in cpu format
584 *
585 * This is used when drivers do not need or cannot perform
586 * lower level pdu processing.
587 *
588 * Called with session lock
589 */
590void iscsi_complete_scsi_task(struct iscsi_task *task,
591 uint32_t exp_cmdsn, uint32_t max_cmdsn)
592{
593 struct iscsi_conn *conn = task->conn;
594
595 ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt);
596
597 conn->last_recv = jiffies;
598 __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn);
599 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
600}
601EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task);
602
603
Mike Christie3bbaaad2009-05-13 17:57:46 -0500604/*
605 * session lock must be held and if not called for a task that is
606 * still pending or from the xmit thread, then xmit thread must
607 * be suspended.
608 */
609static void fail_scsi_task(struct iscsi_task *task, int err)
610{
611 struct iscsi_conn *conn = task->conn;
Mike Christieb3a7ea82007-12-13 12:43:26 -0600612 struct scsi_cmnd *sc;
Mike Christieb3cd5052009-05-13 17:57:49 -0500613 int state;
Mike Christieb3a7ea82007-12-13 12:43:26 -0600614
Mike Christie3bbaaad2009-05-13 17:57:46 -0500615 /*
616 * if a command completes and we get a successful tmf response
617 * we will hit this because the scsi eh abort code does not take
618 * a ref to the task.
619 */
Mike Christie9c19a7d2008-05-21 15:54:09 -0500620 sc = task->sc;
Mike Christieb3a7ea82007-12-13 12:43:26 -0600621 if (!sc)
622 return;
623
Mike Christieb3cd5052009-05-13 17:57:49 -0500624 if (task->state == ISCSI_TASK_PENDING) {
Mike Christieb3a7ea82007-12-13 12:43:26 -0600625 /*
626 * cmd never made it to the xmit thread, so we should not count
627 * the cmd in the sequencing
628 */
629 conn->session->queued_cmdsn--;
Mike Christieb3cd5052009-05-13 17:57:49 -0500630 /* it was never sent so just complete like normal */
631 state = ISCSI_TASK_COMPLETED;
632 } else if (err == DID_TRANSPORT_DISRUPTED)
633 state = ISCSI_TASK_ABRT_SESS_RECOV;
634 else
635 state = ISCSI_TASK_ABRT_TMF;
Mike Christieb3a7ea82007-12-13 12:43:26 -0600636
Mike Christieb3cd5052009-05-13 17:57:49 -0500637 sc->result = err << 16;
Boaz Harroshc07d4442008-04-18 10:11:52 -0500638 if (!scsi_bidi_cmnd(sc))
639 scsi_set_resid(sc, scsi_bufflen(sc));
640 else {
641 scsi_out(sc)->resid = scsi_out(sc)->length;
642 scsi_in(sc)->resid = scsi_in(sc)->length;
643 }
Mike Christie3e5c28a2008-05-21 15:54:06 -0500644
Mike Christieb3cd5052009-05-13 17:57:49 -0500645 iscsi_complete_task(task, state);
Mike Christieb3a7ea82007-12-13 12:43:26 -0600646}
647
Mike Christie3e5c28a2008-05-21 15:54:06 -0500648static int iscsi_prep_mgmt_task(struct iscsi_conn *conn,
Mike Christie9c19a7d2008-05-21 15:54:09 -0500649 struct iscsi_task *task)
Mike Christie052d0142008-05-21 15:54:05 -0500650{
651 struct iscsi_session *session = conn->session;
Mike Christie577577d2008-12-02 00:32:05 -0600652 struct iscsi_hdr *hdr = task->hdr;
Mike Christie052d0142008-05-21 15:54:05 -0500653 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
Mike Christie4f704dc2009-11-11 16:34:31 -0600654 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
Mike Christie052d0142008-05-21 15:54:05 -0500655
656 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
657 return -ENOTCONN;
658
Mike Christie4f704dc2009-11-11 16:34:31 -0600659 if (opcode != ISCSI_OP_LOGIN && opcode != ISCSI_OP_TEXT)
Mike Christie052d0142008-05-21 15:54:05 -0500660 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
661 /*
662 * pre-format CmdSN for outgoing PDU.
663 */
664 nop->cmdsn = cpu_to_be32(session->cmdsn);
665 if (hdr->itt != RESERVED_ITT) {
Mike Christie052d0142008-05-21 15:54:05 -0500666 /*
Mike Christie4f704dc2009-11-11 16:34:31 -0600667 * TODO: We always use immediate for normal session pdus.
Mike Christie052d0142008-05-21 15:54:05 -0500668 * If we start to send tmfs or nops as non-immediate then
669 * we should start checking the cmdsn numbers for mgmt tasks.
Mike Christie4f704dc2009-11-11 16:34:31 -0600670 *
671 * During discovery sessions iscsid sends TEXT as non immediate,
672 * but we always only send one PDU at a time.
Mike Christie052d0142008-05-21 15:54:05 -0500673 */
674 if (conn->c_stage == ISCSI_CONN_STARTED &&
675 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
676 session->queued_cmdsn++;
677 session->cmdsn++;
678 }
679 }
680
Mike Christieae15f802008-12-02 00:32:15 -0600681 if (session->tt->init_task && session->tt->init_task(task))
682 return -EIO;
Mike Christie052d0142008-05-21 15:54:05 -0500683
684 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT)
685 session->state = ISCSI_STATE_LOGGING_OUT;
686
Mike Christie577577d2008-12-02 00:32:05 -0600687 task->state = ISCSI_TASK_RUNNING;
Mike Christie1b2c7af2009-03-05 14:45:58 -0600688 ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x "
689 "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK,
690 hdr->itt, task->data_count);
Mike Christie052d0142008-05-21 15:54:05 -0500691 return 0;
692}
693
Mike Christie9c19a7d2008-05-21 15:54:09 -0500694static struct iscsi_task *
Mike Christief6d51802007-12-13 12:43:30 -0600695__iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
696 char *data, uint32_t data_size)
697{
698 struct iscsi_session *session = conn->session;
Mike Christie1336aed2009-05-13 17:57:48 -0500699 struct iscsi_host *ihost = shost_priv(session->host);
Mike Christie4f704dc2009-11-11 16:34:31 -0600700 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
Mike Christie9c19a7d2008-05-21 15:54:09 -0500701 struct iscsi_task *task;
Mike Christie262ef632008-12-02 00:32:13 -0600702 itt_t itt;
Mike Christief6d51802007-12-13 12:43:30 -0600703
704 if (session->state == ISCSI_STATE_TERMINATE)
705 return NULL;
706
Mike Christie4f704dc2009-11-11 16:34:31 -0600707 if (opcode == ISCSI_OP_LOGIN || opcode == ISCSI_OP_TEXT) {
Mike Christief6d51802007-12-13 12:43:30 -0600708 /*
709 * Login and Text are sent serially, in
710 * request-followed-by-response sequence.
Mike Christie3e5c28a2008-05-21 15:54:06 -0500711 * Same task can be used. Same ITT must be used.
712 * Note that login_task is preallocated at conn_create().
Mike Christief6d51802007-12-13 12:43:30 -0600713 */
Mike Christie4f704dc2009-11-11 16:34:31 -0600714 if (conn->login_task->state != ISCSI_TASK_FREE) {
715 iscsi_conn_printk(KERN_ERR, conn, "Login/Text in "
716 "progress. Cannot start new task.\n");
717 return NULL;
718 }
719
Mike Christie9c19a7d2008-05-21 15:54:09 -0500720 task = conn->login_task;
Mike Christie4f704dc2009-11-11 16:34:31 -0600721 } else {
Mike Christie26013ad2009-05-13 17:57:43 -0500722 if (session->state != ISCSI_STATE_LOGGED_IN)
723 return NULL;
724
Mike Christief6d51802007-12-13 12:43:30 -0600725 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
726 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
727
Stefani Seibold7acd72e2009-12-21 14:37:28 -0800728 if (!kfifo_out(&session->cmdpool.queue,
Mike Christie9c19a7d2008-05-21 15:54:09 -0500729 (void*)&task, sizeof(void*)))
Mike Christief6d51802007-12-13 12:43:30 -0600730 return NULL;
731 }
Mike Christie3e5c28a2008-05-21 15:54:06 -0500732 /*
733 * released in complete pdu for task we expect a response for, and
734 * released by the lld when it has transmitted the task for
735 * pdus we do not expect a response for.
736 */
Mike Christie9c19a7d2008-05-21 15:54:09 -0500737 atomic_set(&task->refcount, 1);
738 task->conn = conn;
739 task->sc = NULL;
Mike Christie3bbaaad2009-05-13 17:57:46 -0500740 INIT_LIST_HEAD(&task->running);
741 task->state = ISCSI_TASK_PENDING;
Mike Christief6d51802007-12-13 12:43:30 -0600742
743 if (data_size) {
Mike Christie9c19a7d2008-05-21 15:54:09 -0500744 memcpy(task->data, data, data_size);
745 task->data_count = data_size;
Mike Christief6d51802007-12-13 12:43:30 -0600746 } else
Mike Christie9c19a7d2008-05-21 15:54:09 -0500747 task->data_count = 0;
Mike Christief6d51802007-12-13 12:43:30 -0600748
Mike Christie184b57c2009-05-13 17:57:39 -0500749 if (conn->session->tt->alloc_pdu) {
750 if (conn->session->tt->alloc_pdu(task, hdr->opcode)) {
751 iscsi_conn_printk(KERN_ERR, conn, "Could not allocate "
752 "pdu for mgmt task.\n");
Mike Christie3bbaaad2009-05-13 17:57:46 -0500753 goto free_task;
Mike Christie184b57c2009-05-13 17:57:39 -0500754 }
Mike Christie577577d2008-12-02 00:32:05 -0600755 }
Mike Christie184b57c2009-05-13 17:57:39 -0500756
Mike Christie262ef632008-12-02 00:32:13 -0600757 itt = task->hdr->itt;
Mike Christie577577d2008-12-02 00:32:05 -0600758 task->hdr_len = sizeof(struct iscsi_hdr);
Mike Christie9c19a7d2008-05-21 15:54:09 -0500759 memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr));
Mike Christie262ef632008-12-02 00:32:13 -0600760
761 if (hdr->itt != RESERVED_ITT) {
762 if (session->tt->parse_pdu_itt)
763 task->hdr->itt = itt;
764 else
765 task->hdr->itt = build_itt(task->itt,
766 task->conn->session->age);
767 }
768
Mike Christie1336aed2009-05-13 17:57:48 -0500769 if (!ihost->workq) {
Mike Christie577577d2008-12-02 00:32:05 -0600770 if (iscsi_prep_mgmt_task(conn, task))
771 goto free_task;
Mike Christie052d0142008-05-21 15:54:05 -0500772
Mike Christie9c19a7d2008-05-21 15:54:09 -0500773 if (session->tt->xmit_task(task))
Mike Christie577577d2008-12-02 00:32:05 -0600774 goto free_task;
Mike Christie3bbaaad2009-05-13 17:57:46 -0500775 } else {
776 list_add_tail(&task->running, &conn->mgmtqueue);
Mike Christie32ae7632009-03-05 14:46:03 -0600777 iscsi_conn_queue_work(conn);
Mike Christie3bbaaad2009-05-13 17:57:46 -0500778 }
Mike Christie052d0142008-05-21 15:54:05 -0500779
Mike Christie9c19a7d2008-05-21 15:54:09 -0500780 return task;
Mike Christie577577d2008-12-02 00:32:05 -0600781
782free_task:
783 __iscsi_put_task(task);
784 return NULL;
Mike Christief6d51802007-12-13 12:43:30 -0600785}
786
787int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
788 char *data, uint32_t data_size)
789{
790 struct iscsi_conn *conn = cls_conn->dd_data;
791 struct iscsi_session *session = conn->session;
792 int err = 0;
793
794 spin_lock_bh(&session->lock);
795 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size))
796 err = -EPERM;
797 spin_unlock_bh(&session->lock);
Mike Christief6d51802007-12-13 12:43:30 -0600798 return err;
799}
800EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
801
Mike Christie7996a772006-04-06 21:13:41 -0500802/**
803 * iscsi_cmd_rsp - SCSI Command Response processing
804 * @conn: iscsi connection
805 * @hdr: iscsi header
Mike Christie9c19a7d2008-05-21 15:54:09 -0500806 * @task: scsi command task
Mike Christie7996a772006-04-06 21:13:41 -0500807 * @data: cmd data buffer
808 * @datalen: len of buffer
809 *
810 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
Mike Christie9c19a7d2008-05-21 15:54:09 -0500811 * then completes the command and task.
Mike Christie7996a772006-04-06 21:13:41 -0500812 **/
Mike Christie77a23c22007-05-30 12:57:18 -0500813static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
Mike Christie9c19a7d2008-05-21 15:54:09 -0500814 struct iscsi_task *task, char *data,
Mike Christie77a23c22007-05-30 12:57:18 -0500815 int datalen)
Mike Christie7996a772006-04-06 21:13:41 -0500816{
Nicholas Bellinger12352182011-05-27 11:16:33 +0000817 struct iscsi_scsi_rsp *rhdr = (struct iscsi_scsi_rsp *)hdr;
Mike Christie7996a772006-04-06 21:13:41 -0500818 struct iscsi_session *session = conn->session;
Mike Christie9c19a7d2008-05-21 15:54:09 -0500819 struct scsi_cmnd *sc = task->sc;
Mike Christie7996a772006-04-06 21:13:41 -0500820
Mike Christie77a23c22007-05-30 12:57:18 -0500821 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
Mike Christie7996a772006-04-06 21:13:41 -0500822 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
823
824 sc->result = (DID_OK << 16) | rhdr->cmd_status;
825
826 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
827 sc->result = DID_ERROR << 16;
828 goto out;
829 }
830
831 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
Mike Christie9b80cb42006-12-17 12:10:28 -0600832 uint16_t senselen;
Mike Christie7996a772006-04-06 21:13:41 -0500833
834 if (datalen < 2) {
835invalid_datalen:
Mike Christie322d7392008-01-31 13:36:52 -0600836 iscsi_conn_printk(KERN_ERR, conn,
837 "Got CHECK_CONDITION but invalid data "
838 "buffer size of %d\n", datalen);
Mike Christie7996a772006-04-06 21:13:41 -0500839 sc->result = DID_BAD_TARGET << 16;
840 goto out;
841 }
842
Harvey Harrison8f3339912008-05-21 15:54:20 -0500843 senselen = get_unaligned_be16(data);
Mike Christie7996a772006-04-06 21:13:41 -0500844 if (datalen < senselen)
845 goto invalid_datalen;
846
847 memcpy(sc->sense_buffer, data + 2,
Mike Christie9b80cb42006-12-17 12:10:28 -0600848 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
Mike Christie1b2c7af2009-03-05 14:45:58 -0600849 ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n",
850 min_t(uint16_t, senselen,
851 SCSI_SENSE_BUFFERSIZE));
Mike Christie7996a772006-04-06 21:13:41 -0500852 }
853
Boaz Harroshc07d4442008-04-18 10:11:52 -0500854 if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
855 ISCSI_FLAG_CMD_BIDI_OVERFLOW)) {
856 int res_count = be32_to_cpu(rhdr->bi_residual_count);
857
858 if (scsi_bidi_cmnd(sc) && res_count > 0 &&
859 (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW ||
860 res_count <= scsi_in(sc)->length))
861 scsi_in(sc)->resid = res_count;
862 else
863 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
864 }
865
Boaz Harrosh7207fea2007-12-13 12:43:22 -0600866 if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
867 ISCSI_FLAG_CMD_OVERFLOW)) {
Mike Christie7996a772006-04-06 21:13:41 -0500868 int res_count = be32_to_cpu(rhdr->residual_count);
869
Boaz Harrosh7207fea2007-12-13 12:43:22 -0600870 if (res_count > 0 &&
871 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
872 res_count <= scsi_bufflen(sc)))
Boaz Harroshc07d4442008-04-18 10:11:52 -0500873 /* write side for bidi or uni-io set_resid */
FUJITA Tomonori1c138992007-06-14 22:13:17 +0900874 scsi_set_resid(sc, res_count);
Mike Christie7996a772006-04-06 21:13:41 -0500875 else
876 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
Boaz Harroshc07d4442008-04-18 10:11:52 -0500877 }
Mike Christie7996a772006-04-06 21:13:41 -0500878out:
Mike Christie3bbaaad2009-05-13 17:57:46 -0500879 ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n",
Mike Christie1b2c7af2009-03-05 14:45:58 -0600880 sc, sc->result, task->itt);
Mike Christie7996a772006-04-06 21:13:41 -0500881 conn->scsirsp_pdus_cnt++;
Mike Christieb3cd5052009-05-13 17:57:49 -0500882 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
Mike Christie7996a772006-04-06 21:13:41 -0500883}
884
Mike Christie1d9edf02008-09-24 11:46:09 -0500885/**
886 * iscsi_data_in_rsp - SCSI Data-In Response processing
887 * @conn: iscsi connection
888 * @hdr: iscsi pdu
889 * @task: scsi command task
890 **/
891static void
892iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
893 struct iscsi_task *task)
894{
895 struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr;
896 struct scsi_cmnd *sc = task->sc;
897
898 if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS))
899 return;
900
Mike Christieedbc9aa052009-05-13 17:57:42 -0500901 iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr);
Mike Christie1d9edf02008-09-24 11:46:09 -0500902 sc->result = (DID_OK << 16) | rhdr->cmd_status;
903 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
904 if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW |
905 ISCSI_FLAG_DATA_OVERFLOW)) {
906 int res_count = be32_to_cpu(rhdr->residual_count);
907
908 if (res_count > 0 &&
909 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
910 res_count <= scsi_in(sc)->length))
911 scsi_in(sc)->resid = res_count;
912 else
913 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
914 }
915
Mike Christie3bbaaad2009-05-13 17:57:46 -0500916 ISCSI_DBG_SESSION(conn->session, "data in with status done "
917 "[sc %p res %d itt 0x%x]\n",
918 sc, sc->result, task->itt);
Mike Christie1d9edf02008-09-24 11:46:09 -0500919 conn->scsirsp_pdus_cnt++;
Mike Christieb3cd5052009-05-13 17:57:49 -0500920 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
Mike Christie1d9edf02008-09-24 11:46:09 -0500921}
922
Mike Christie7ea8b822006-07-24 15:47:22 -0500923static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
924{
925 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
926
927 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
928 conn->tmfrsp_pdus_cnt++;
929
Mike Christie843c0a82007-12-13 12:43:20 -0600930 if (conn->tmf_state != TMF_QUEUED)
Mike Christie7ea8b822006-07-24 15:47:22 -0500931 return;
932
933 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
Mike Christie843c0a82007-12-13 12:43:20 -0600934 conn->tmf_state = TMF_SUCCESS;
Mike Christie7ea8b822006-07-24 15:47:22 -0500935 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
Mike Christie843c0a82007-12-13 12:43:20 -0600936 conn->tmf_state = TMF_NOT_FOUND;
Mike Christie7ea8b822006-07-24 15:47:22 -0500937 else
Mike Christie843c0a82007-12-13 12:43:20 -0600938 conn->tmf_state = TMF_FAILED;
Mike Christie7ea8b822006-07-24 15:47:22 -0500939 wake_up(&conn->ehwait);
940}
941
Mike Christief6d51802007-12-13 12:43:30 -0600942static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr)
943{
944 struct iscsi_nopout hdr;
Mike Christie9c19a7d2008-05-21 15:54:09 -0500945 struct iscsi_task *task;
Mike Christief6d51802007-12-13 12:43:30 -0600946
Mike Christie9c19a7d2008-05-21 15:54:09 -0500947 if (!rhdr && conn->ping_task)
Mike Christief6d51802007-12-13 12:43:30 -0600948 return;
949
950 memset(&hdr, 0, sizeof(struct iscsi_nopout));
951 hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE;
952 hdr.flags = ISCSI_FLAG_CMD_FINAL;
953
954 if (rhdr) {
Andy Grover55bdabd2011-06-16 15:57:09 -0700955 hdr.lun = rhdr->lun;
Mike Christief6d51802007-12-13 12:43:30 -0600956 hdr.ttt = rhdr->ttt;
957 hdr.itt = RESERVED_ITT;
958 } else
959 hdr.ttt = RESERVED_ITT;
960
Mike Christie9c19a7d2008-05-21 15:54:09 -0500961 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0);
962 if (!task)
Mike Christie322d7392008-01-31 13:36:52 -0600963 iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n");
Mike Christied3acf022008-12-01 12:13:00 -0600964 else if (!rhdr) {
965 /* only track our nops */
966 conn->ping_task = task;
967 conn->last_ping = jiffies;
968 }
Mike Christief6d51802007-12-13 12:43:30 -0600969}
970
Mike Christie8afa1432009-08-20 15:10:59 -0500971static int iscsi_nop_out_rsp(struct iscsi_task *task,
972 struct iscsi_nopin *nop, char *data, int datalen)
973{
974 struct iscsi_conn *conn = task->conn;
975 int rc = 0;
976
977 if (conn->ping_task != task) {
978 /*
979 * If this is not in response to one of our
980 * nops then it must be from userspace.
981 */
982 if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop,
983 data, datalen))
984 rc = ISCSI_ERR_CONN_FAILED;
985 } else
986 mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout);
987 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
988 return rc;
989}
990
Mike Christie62f38302006-08-31 18:09:27 -0400991static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
992 char *data, int datalen)
993{
994 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
995 struct iscsi_hdr rejected_pdu;
Mike Christie8afa1432009-08-20 15:10:59 -0500996 int opcode, rc = 0;
Mike Christie62f38302006-08-31 18:09:27 -0400997
998 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
999
Mike Christie8afa1432009-08-20 15:10:59 -05001000 if (ntoh24(reject->dlength) > datalen ||
1001 ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) {
1002 iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected "
1003 "pdu. Invalid data length (pdu dlength "
1004 "%u, datalen %d\n", ntoh24(reject->dlength),
1005 datalen);
1006 return ISCSI_ERR_PROTO;
Mike Christie62f38302006-08-31 18:09:27 -04001007 }
Mike Christie8afa1432009-08-20 15:10:59 -05001008 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
1009 opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK;
1010
1011 switch (reject->reason) {
1012 case ISCSI_REASON_DATA_DIGEST_ERROR:
1013 iscsi_conn_printk(KERN_ERR, conn,
1014 "pdu (op 0x%x itt 0x%x) rejected "
1015 "due to DataDigest error.\n",
1016 rejected_pdu.itt, opcode);
1017 break;
1018 case ISCSI_REASON_IMM_CMD_REJECT:
1019 iscsi_conn_printk(KERN_ERR, conn,
1020 "pdu (op 0x%x itt 0x%x) rejected. Too many "
1021 "immediate commands.\n",
1022 rejected_pdu.itt, opcode);
1023 /*
1024 * We only send one TMF at a time so if the target could not
1025 * handle it, then it should get fixed (RFC mandates that
1026 * a target can handle one immediate TMF per conn).
1027 *
1028 * For nops-outs, we could have sent more than one if
1029 * the target is sending us lots of nop-ins
1030 */
1031 if (opcode != ISCSI_OP_NOOP_OUT)
1032 return 0;
1033
1034 if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG))
1035 /*
1036 * nop-out in response to target's nop-out rejected.
1037 * Just resend.
1038 */
1039 iscsi_send_nopout(conn,
1040 (struct iscsi_nopin*)&rejected_pdu);
1041 else {
1042 struct iscsi_task *task;
1043 /*
1044 * Our nop as ping got dropped. We know the target
1045 * and transport are ok so just clean up
1046 */
1047 task = iscsi_itt_to_task(conn, rejected_pdu.itt);
1048 if (!task) {
1049 iscsi_conn_printk(KERN_ERR, conn,
1050 "Invalid pdu reject. Could "
1051 "not lookup rejected task.\n");
1052 rc = ISCSI_ERR_BAD_ITT;
1053 } else
1054 rc = iscsi_nop_out_rsp(task,
1055 (struct iscsi_nopin*)&rejected_pdu,
1056 NULL, 0);
1057 }
1058 break;
1059 default:
1060 iscsi_conn_printk(KERN_ERR, conn,
1061 "pdu (op 0x%x itt 0x%x) rejected. Reason "
1062 "code 0x%x\n", rejected_pdu.itt,
1063 rejected_pdu.opcode, reject->reason);
1064 break;
1065 }
1066 return rc;
Mike Christie62f38302006-08-31 18:09:27 -04001067}
1068
Mike Christie7996a772006-04-06 21:13:41 -05001069/**
Mike Christie913e5bf2008-05-21 15:54:18 -05001070 * iscsi_itt_to_task - look up task by itt
1071 * @conn: iscsi connection
1072 * @itt: itt
1073 *
1074 * This should be used for mgmt tasks like login and nops, or if
1075 * the LDD's itt space does not include the session age.
1076 *
1077 * The session lock must be held.
1078 */
Mike Christie8f9256c2009-05-13 17:57:41 -05001079struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt)
Mike Christie913e5bf2008-05-21 15:54:18 -05001080{
1081 struct iscsi_session *session = conn->session;
Mike Christie262ef632008-12-02 00:32:13 -06001082 int i;
Mike Christie913e5bf2008-05-21 15:54:18 -05001083
1084 if (itt == RESERVED_ITT)
1085 return NULL;
1086
Mike Christie262ef632008-12-02 00:32:13 -06001087 if (session->tt->parse_pdu_itt)
1088 session->tt->parse_pdu_itt(conn, itt, &i, NULL);
1089 else
1090 i = get_itt(itt);
Mike Christie913e5bf2008-05-21 15:54:18 -05001091 if (i >= session->cmds_max)
1092 return NULL;
1093
1094 return session->cmds[i];
1095}
Mike Christie8f9256c2009-05-13 17:57:41 -05001096EXPORT_SYMBOL_GPL(iscsi_itt_to_task);
Mike Christie913e5bf2008-05-21 15:54:18 -05001097
1098/**
Mike Christie7996a772006-04-06 21:13:41 -05001099 * __iscsi_complete_pdu - complete pdu
1100 * @conn: iscsi conn
1101 * @hdr: iscsi header
1102 * @data: data buffer
1103 * @datalen: len of data buffer
1104 *
1105 * Completes pdu processing by freeing any resources allocated at
1106 * queuecommand or send generic. session lock must be held and verify
1107 * itt must have been called.
1108 */
Mike Christie913e5bf2008-05-21 15:54:18 -05001109int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1110 char *data, int datalen)
Mike Christie7996a772006-04-06 21:13:41 -05001111{
1112 struct iscsi_session *session = conn->session;
1113 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
Mike Christie9c19a7d2008-05-21 15:54:09 -05001114 struct iscsi_task *task;
Mike Christie7996a772006-04-06 21:13:41 -05001115 uint32_t itt;
1116
Mike Christief6d51802007-12-13 12:43:30 -06001117 conn->last_recv = jiffies;
Mike Christie0af967f2008-05-21 15:54:04 -05001118 rc = iscsi_verify_itt(conn, hdr->itt);
1119 if (rc)
1120 return rc;
1121
Al Virob4377352007-02-09 16:39:40 +00001122 if (hdr->itt != RESERVED_ITT)
1123 itt = get_itt(hdr->itt);
Mike Christie7996a772006-04-06 21:13:41 -05001124 else
Al Virob4377352007-02-09 16:39:40 +00001125 itt = ~0U;
Mike Christie7996a772006-04-06 21:13:41 -05001126
Mike Christie1b2c7af2009-03-05 14:45:58 -06001127 ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n",
1128 opcode, conn->id, itt, datalen);
Mike Christie7996a772006-04-06 21:13:41 -05001129
Mike Christie3e5c28a2008-05-21 15:54:06 -05001130 if (itt == ~0U) {
Mike Christie77a23c22007-05-30 12:57:18 -05001131 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
Mike Christie62f38302006-08-31 18:09:27 -04001132
Mike Christie7996a772006-04-06 21:13:41 -05001133 switch(opcode) {
1134 case ISCSI_OP_NOOP_IN:
Mike Christie40527af2006-07-24 15:47:45 -05001135 if (datalen) {
Mike Christie7996a772006-04-06 21:13:41 -05001136 rc = ISCSI_ERR_PROTO;
Mike Christie40527af2006-07-24 15:47:45 -05001137 break;
1138 }
1139
Al Virob4377352007-02-09 16:39:40 +00001140 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
Mike Christie40527af2006-07-24 15:47:45 -05001141 break;
1142
Mike Christief6d51802007-12-13 12:43:30 -06001143 iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr);
Mike Christie7996a772006-04-06 21:13:41 -05001144 break;
1145 case ISCSI_OP_REJECT:
Mike Christie62f38302006-08-31 18:09:27 -04001146 rc = iscsi_handle_reject(conn, hdr, data, datalen);
1147 break;
Mike Christie7996a772006-04-06 21:13:41 -05001148 case ISCSI_OP_ASYNC_EVENT:
Mike Christie8d2860b2006-05-02 19:46:47 -05001149 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
Mike Christie5831c732006-10-16 18:09:41 -04001150 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1151 rc = ISCSI_ERR_CONN_FAILED;
Mike Christie7996a772006-04-06 21:13:41 -05001152 break;
1153 default:
1154 rc = ISCSI_ERR_BAD_OPCODE;
1155 break;
1156 }
Mike Christie3e5c28a2008-05-21 15:54:06 -05001157 goto out;
1158 }
Mike Christie7996a772006-04-06 21:13:41 -05001159
Mike Christie3e5c28a2008-05-21 15:54:06 -05001160 switch(opcode) {
1161 case ISCSI_OP_SCSI_CMD_RSP:
Mike Christie913e5bf2008-05-21 15:54:18 -05001162 case ISCSI_OP_SCSI_DATA_IN:
1163 task = iscsi_itt_to_ctask(conn, hdr->itt);
1164 if (!task)
1165 return ISCSI_ERR_BAD_ITT;
Mike Christied355e572009-06-15 22:11:08 -05001166 task->last_xfer = jiffies;
Mike Christie913e5bf2008-05-21 15:54:18 -05001167 break;
1168 case ISCSI_OP_R2T:
1169 /*
1170 * LLD handles R2Ts if they need to.
1171 */
1172 return 0;
1173 case ISCSI_OP_LOGOUT_RSP:
1174 case ISCSI_OP_LOGIN_RSP:
1175 case ISCSI_OP_TEXT_RSP:
1176 case ISCSI_OP_SCSI_TMFUNC_RSP:
1177 case ISCSI_OP_NOOP_IN:
1178 task = iscsi_itt_to_task(conn, hdr->itt);
1179 if (!task)
1180 return ISCSI_ERR_BAD_ITT;
1181 break;
1182 default:
1183 return ISCSI_ERR_BAD_OPCODE;
1184 }
1185
1186 switch(opcode) {
1187 case ISCSI_OP_SCSI_CMD_RSP:
Mike Christie9c19a7d2008-05-21 15:54:09 -05001188 iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen);
Mike Christie3e5c28a2008-05-21 15:54:06 -05001189 break;
1190 case ISCSI_OP_SCSI_DATA_IN:
Mike Christie1d9edf02008-09-24 11:46:09 -05001191 iscsi_data_in_rsp(conn, hdr, task);
Mike Christie3e5c28a2008-05-21 15:54:06 -05001192 break;
Mike Christie3e5c28a2008-05-21 15:54:06 -05001193 case ISCSI_OP_LOGOUT_RSP:
1194 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1195 if (datalen) {
1196 rc = ISCSI_ERR_PROTO;
1197 break;
1198 }
1199 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1200 goto recv_pdu;
1201 case ISCSI_OP_LOGIN_RSP:
1202 case ISCSI_OP_TEXT_RSP:
1203 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1204 /*
1205 * login related PDU's exp_statsn is handled in
1206 * userspace
1207 */
1208 goto recv_pdu;
1209 case ISCSI_OP_SCSI_TMFUNC_RSP:
1210 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1211 if (datalen) {
1212 rc = ISCSI_ERR_PROTO;
1213 break;
1214 }
1215
1216 iscsi_tmf_rsp(conn, hdr);
Mike Christieb3cd5052009-05-13 17:57:49 -05001217 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
Mike Christie3e5c28a2008-05-21 15:54:06 -05001218 break;
1219 case ISCSI_OP_NOOP_IN:
1220 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1221 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) {
1222 rc = ISCSI_ERR_PROTO;
1223 break;
1224 }
1225 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1226
Mike Christie8afa1432009-08-20 15:10:59 -05001227 rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr,
1228 data, datalen);
Mike Christie3e5c28a2008-05-21 15:54:06 -05001229 break;
1230 default:
1231 rc = ISCSI_ERR_BAD_OPCODE;
1232 break;
1233 }
1234
1235out:
1236 return rc;
1237recv_pdu:
1238 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1239 rc = ISCSI_ERR_CONN_FAILED;
Mike Christieb3cd5052009-05-13 17:57:49 -05001240 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
Mike Christie7996a772006-04-06 21:13:41 -05001241 return rc;
1242}
Mike Christie913e5bf2008-05-21 15:54:18 -05001243EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
Mike Christie7996a772006-04-06 21:13:41 -05001244
1245int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1246 char *data, int datalen)
1247{
1248 int rc;
1249
1250 spin_lock(&conn->session->lock);
1251 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
1252 spin_unlock(&conn->session->lock);
1253 return rc;
1254}
1255EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
1256
Mike Christie0af967f2008-05-21 15:54:04 -05001257int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt)
Mike Christie7996a772006-04-06 21:13:41 -05001258{
1259 struct iscsi_session *session = conn->session;
Mike Christie262ef632008-12-02 00:32:13 -06001260 int age = 0, i = 0;
Mike Christie7996a772006-04-06 21:13:41 -05001261
Mike Christie0af967f2008-05-21 15:54:04 -05001262 if (itt == RESERVED_ITT)
1263 return 0;
Mike Christie7996a772006-04-06 21:13:41 -05001264
Mike Christie262ef632008-12-02 00:32:13 -06001265 if (session->tt->parse_pdu_itt)
1266 session->tt->parse_pdu_itt(conn, itt, &i, &age);
1267 else {
1268 i = get_itt(itt);
1269 age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK;
1270 }
1271
1272 if (age != session->age) {
Mike Christie0af967f2008-05-21 15:54:04 -05001273 iscsi_conn_printk(KERN_ERR, conn,
1274 "received itt %x expected session age (%x)\n",
Mike Christie913e5bf2008-05-21 15:54:18 -05001275 (__force u32)itt, session->age);
Mike Christie0af967f2008-05-21 15:54:04 -05001276 return ISCSI_ERR_BAD_ITT;
1277 }
Mike Christie7996a772006-04-06 21:13:41 -05001278
Mike Christie3e5c28a2008-05-21 15:54:06 -05001279 if (i >= session->cmds_max) {
1280 iscsi_conn_printk(KERN_ERR, conn,
1281 "received invalid itt index %u (max cmds "
1282 "%u.\n", i, session->cmds_max);
1283 return ISCSI_ERR_BAD_ITT;
Mike Christie7996a772006-04-06 21:13:41 -05001284 }
Mike Christie7996a772006-04-06 21:13:41 -05001285 return 0;
1286}
1287EXPORT_SYMBOL_GPL(iscsi_verify_itt);
1288
Mike Christie913e5bf2008-05-21 15:54:18 -05001289/**
1290 * iscsi_itt_to_ctask - look up ctask by itt
1291 * @conn: iscsi connection
1292 * @itt: itt
1293 *
1294 * This should be used for cmd tasks.
1295 *
1296 * The session lock must be held.
1297 */
1298struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt)
Mike Christie0af967f2008-05-21 15:54:04 -05001299{
Mike Christie9c19a7d2008-05-21 15:54:09 -05001300 struct iscsi_task *task;
Mike Christie0af967f2008-05-21 15:54:04 -05001301
1302 if (iscsi_verify_itt(conn, itt))
1303 return NULL;
1304
Mike Christie913e5bf2008-05-21 15:54:18 -05001305 task = iscsi_itt_to_task(conn, itt);
1306 if (!task || !task->sc)
Mike Christie0af967f2008-05-21 15:54:04 -05001307 return NULL;
1308
Mike Christie913e5bf2008-05-21 15:54:18 -05001309 if (task->sc->SCp.phase != conn->session->age) {
1310 iscsi_session_printk(KERN_ERR, conn->session,
1311 "task's session age %d, expected %d\n",
1312 task->sc->SCp.phase, conn->session->age);
Mike Christie0af967f2008-05-21 15:54:04 -05001313 return NULL;
Mike Christie913e5bf2008-05-21 15:54:18 -05001314 }
Mike Christie0af967f2008-05-21 15:54:04 -05001315
Mike Christie9c19a7d2008-05-21 15:54:09 -05001316 return task;
Mike Christie0af967f2008-05-21 15:54:04 -05001317}
1318EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask);
1319
Mike Christie40a06e72009-03-05 14:46:05 -06001320void iscsi_session_failure(struct iscsi_session *session,
Mike Christiee5bd7b52008-09-24 11:46:10 -05001321 enum iscsi_err err)
1322{
Mike Christiee5bd7b52008-09-24 11:46:10 -05001323 struct iscsi_conn *conn;
1324 struct device *dev;
Mike Christiee5bd7b52008-09-24 11:46:10 -05001325
Mike Christiebfcf72e2010-12-31 02:22:22 -06001326 spin_lock_bh(&session->lock);
Mike Christiee5bd7b52008-09-24 11:46:10 -05001327 conn = session->leadconn;
1328 if (session->state == ISCSI_STATE_TERMINATE || !conn) {
Mike Christiebfcf72e2010-12-31 02:22:22 -06001329 spin_unlock_bh(&session->lock);
Mike Christiee5bd7b52008-09-24 11:46:10 -05001330 return;
1331 }
1332
1333 dev = get_device(&conn->cls_conn->dev);
Mike Christiebfcf72e2010-12-31 02:22:22 -06001334 spin_unlock_bh(&session->lock);
Mike Christiee5bd7b52008-09-24 11:46:10 -05001335 if (!dev)
1336 return;
1337 /*
1338 * if the host is being removed bypass the connection
1339 * recovery initialization because we are going to kill
1340 * the session.
1341 */
1342 if (err == ISCSI_ERR_INVALID_HOST)
1343 iscsi_conn_error_event(conn->cls_conn, err);
1344 else
1345 iscsi_conn_failure(conn, err);
1346 put_device(dev);
1347}
1348EXPORT_SYMBOL_GPL(iscsi_session_failure);
1349
Mike Christie7996a772006-04-06 21:13:41 -05001350void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
1351{
1352 struct iscsi_session *session = conn->session;
Mike Christie7996a772006-04-06 21:13:41 -05001353
Mike Christiebfcf72e2010-12-31 02:22:22 -06001354 spin_lock_bh(&session->lock);
Mike Christie656cffc2006-05-18 20:31:42 -05001355 if (session->state == ISCSI_STATE_FAILED) {
Mike Christiebfcf72e2010-12-31 02:22:22 -06001356 spin_unlock_bh(&session->lock);
Mike Christie656cffc2006-05-18 20:31:42 -05001357 return;
1358 }
1359
Mike Christie67a61112006-05-30 00:37:20 -05001360 if (conn->stop_stage == 0)
Mike Christie7996a772006-04-06 21:13:41 -05001361 session->state = ISCSI_STATE_FAILED;
Mike Christiebfcf72e2010-12-31 02:22:22 -06001362 spin_unlock_bh(&session->lock);
Mike Christiee5bd7b52008-09-24 11:46:10 -05001363
Mike Christie7996a772006-04-06 21:13:41 -05001364 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1365 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
Mike Christiee5bd7b52008-09-24 11:46:10 -05001366 iscsi_conn_error_event(conn->cls_conn, err);
Mike Christie7996a772006-04-06 21:13:41 -05001367}
1368EXPORT_SYMBOL_GPL(iscsi_conn_failure);
1369
Mike Christie77a23c22007-05-30 12:57:18 -05001370static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
1371{
1372 struct iscsi_session *session = conn->session;
1373
1374 /*
1375 * Check for iSCSI window and take care of CmdSN wrap-around
1376 */
Mike Christiee0726402007-07-26 12:46:48 -05001377 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
Mike Christie1b2c7af2009-03-05 14:45:58 -06001378 ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn "
1379 "%u MaxCmdSN %u CmdSN %u/%u\n",
1380 session->exp_cmdsn, session->max_cmdsn,
1381 session->cmdsn, session->queued_cmdsn);
Mike Christie77a23c22007-05-30 12:57:18 -05001382 return -ENOSPC;
1383 }
1384 return 0;
1385}
1386
Mike Christie9c19a7d2008-05-21 15:54:09 -05001387static int iscsi_xmit_task(struct iscsi_conn *conn)
Mike Christie77a23c22007-05-30 12:57:18 -05001388{
Mike Christie9c19a7d2008-05-21 15:54:09 -05001389 struct iscsi_task *task = conn->task;
Mike Christie843c0a82007-12-13 12:43:20 -06001390 int rc;
Mike Christie77a23c22007-05-30 12:57:18 -05001391
Mike Christie70b31c12009-08-20 15:11:03 -05001392 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx))
1393 return -ENODATA;
1394
Mike Christie9c19a7d2008-05-21 15:54:09 -05001395 __iscsi_get_task(task);
Mike Christie77a23c22007-05-30 12:57:18 -05001396 spin_unlock_bh(&conn->session->lock);
Mike Christie9c19a7d2008-05-21 15:54:09 -05001397 rc = conn->session->tt->xmit_task(task);
Mike Christie77a23c22007-05-30 12:57:18 -05001398 spin_lock_bh(&conn->session->lock);
Mike Christied355e572009-06-15 22:11:08 -05001399 if (!rc) {
Mike Christie9c19a7d2008-05-21 15:54:09 -05001400 /* done with this task */
Mike Christied355e572009-06-15 22:11:08 -05001401 task->last_xfer = jiffies;
Mike Christie9c19a7d2008-05-21 15:54:09 -05001402 conn->task = NULL;
Mike Christied355e572009-06-15 22:11:08 -05001403 }
1404 __iscsi_put_task(task);
Mike Christie77a23c22007-05-30 12:57:18 -05001405 return rc;
1406}
1407
Mike Christie7996a772006-04-06 21:13:41 -05001408/**
Mike Christie9c19a7d2008-05-21 15:54:09 -05001409 * iscsi_requeue_task - requeue task to run from session workqueue
1410 * @task: task to requeue
Mike Christie843c0a82007-12-13 12:43:20 -06001411 *
Mike Christie9c19a7d2008-05-21 15:54:09 -05001412 * LLDs that need to run a task from the session workqueue should call
Mike Christie052d0142008-05-21 15:54:05 -05001413 * this. The session lock must be held. This should only be called
1414 * by software drivers.
Mike Christie843c0a82007-12-13 12:43:20 -06001415 */
Mike Christie9c19a7d2008-05-21 15:54:09 -05001416void iscsi_requeue_task(struct iscsi_task *task)
Mike Christie843c0a82007-12-13 12:43:20 -06001417{
Mike Christie9c19a7d2008-05-21 15:54:09 -05001418 struct iscsi_conn *conn = task->conn;
Mike Christie843c0a82007-12-13 12:43:20 -06001419
Mike Christie3bbaaad2009-05-13 17:57:46 -05001420 /*
1421 * this may be on the requeue list already if the xmit_task callout
1422 * is handling the r2ts while we are adding new ones
1423 */
1424 if (list_empty(&task->running))
1425 list_add_tail(&task->running, &conn->requeue);
Mike Christie32ae7632009-03-05 14:46:03 -06001426 iscsi_conn_queue_work(conn);
Mike Christie843c0a82007-12-13 12:43:20 -06001427}
Mike Christie9c19a7d2008-05-21 15:54:09 -05001428EXPORT_SYMBOL_GPL(iscsi_requeue_task);
Mike Christie843c0a82007-12-13 12:43:20 -06001429
1430/**
Mike Christie7996a772006-04-06 21:13:41 -05001431 * iscsi_data_xmit - xmit any command into the scheduled connection
1432 * @conn: iscsi connection
1433 *
1434 * Notes:
1435 * The function can return -EAGAIN in which case the caller must
1436 * re-schedule it again later or recover. '0' return code means
1437 * successful xmit.
1438 **/
1439static int iscsi_data_xmit(struct iscsi_conn *conn)
1440{
Mike Christie5d12c052009-11-11 16:34:32 -06001441 struct iscsi_task *task;
Mike Christie3219e522006-05-30 00:37:28 -05001442 int rc = 0;
Mike Christie7996a772006-04-06 21:13:41 -05001443
Mike Christie77a23c22007-05-30 12:57:18 -05001444 spin_lock_bh(&conn->session->lock);
Mike Christie70b31c12009-08-20 15:11:03 -05001445 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
Mike Christie1b2c7af2009-03-05 14:45:58 -06001446 ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n");
Mike Christie77a23c22007-05-30 12:57:18 -05001447 spin_unlock_bh(&conn->session->lock);
Mike Christie3219e522006-05-30 00:37:28 -05001448 return -ENODATA;
Mike Christie7996a772006-04-06 21:13:41 -05001449 }
Mike Christie7996a772006-04-06 21:13:41 -05001450
Mike Christie9c19a7d2008-05-21 15:54:09 -05001451 if (conn->task) {
1452 rc = iscsi_xmit_task(conn);
Mike Christie3219e522006-05-30 00:37:28 -05001453 if (rc)
Mike Christie70b31c12009-08-20 15:11:03 -05001454 goto done;
Mike Christie7996a772006-04-06 21:13:41 -05001455 }
1456
Mike Christie77a23c22007-05-30 12:57:18 -05001457 /*
1458 * process mgmt pdus like nops before commands since we should
1459 * only have one nop-out as a ping from us and targets should not
1460 * overflow us with nop-ins
1461 */
1462check_mgmt:
Mike Christie843c0a82007-12-13 12:43:20 -06001463 while (!list_empty(&conn->mgmtqueue)) {
Mike Christie9c19a7d2008-05-21 15:54:09 -05001464 conn->task = list_entry(conn->mgmtqueue.next,
1465 struct iscsi_task, running);
Mike Christie3bbaaad2009-05-13 17:57:46 -05001466 list_del_init(&conn->task->running);
Mike Christie9c19a7d2008-05-21 15:54:09 -05001467 if (iscsi_prep_mgmt_task(conn, conn->task)) {
1468 __iscsi_put_task(conn->task);
1469 conn->task = NULL;
Mike Christieb3a7ea82007-12-13 12:43:26 -06001470 continue;
1471 }
Mike Christie9c19a7d2008-05-21 15:54:09 -05001472 rc = iscsi_xmit_task(conn);
Mike Christie77a23c22007-05-30 12:57:18 -05001473 if (rc)
Mike Christie70b31c12009-08-20 15:11:03 -05001474 goto done;
Mike Christie7996a772006-04-06 21:13:41 -05001475 }
1476
Mike Christie843c0a82007-12-13 12:43:20 -06001477 /* process pending command queue */
Mike Christie3bbaaad2009-05-13 17:57:46 -05001478 while (!list_empty(&conn->cmdqueue)) {
Mike Christie5d12c052009-11-11 16:34:32 -06001479 conn->task = list_entry(conn->cmdqueue.next, struct iscsi_task,
1480 running);
Mike Christie3bbaaad2009-05-13 17:57:46 -05001481 list_del_init(&conn->task->running);
Mike Christieb3a7ea82007-12-13 12:43:26 -06001482 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
Mike Christieb3cd5052009-05-13 17:57:49 -05001483 fail_scsi_task(conn->task, DID_IMM_RETRY);
Mike Christieb3a7ea82007-12-13 12:43:26 -06001484 continue;
1485 }
Mike Christie577577d2008-12-02 00:32:05 -06001486 rc = iscsi_prep_scsi_cmd_pdu(conn->task);
1487 if (rc) {
Mike Christie5d12c052009-11-11 16:34:32 -06001488 if (rc == -ENOMEM || rc == -EACCES) {
Mike Christie3bbaaad2009-05-13 17:57:46 -05001489 list_add_tail(&conn->task->running,
1490 &conn->cmdqueue);
Mike Christie577577d2008-12-02 00:32:05 -06001491 conn->task = NULL;
Mike Christie70b31c12009-08-20 15:11:03 -05001492 goto done;
Mike Christie577577d2008-12-02 00:32:05 -06001493 } else
Mike Christieb3cd5052009-05-13 17:57:49 -05001494 fail_scsi_task(conn->task, DID_ABORT);
Boaz Harrosh004d6532007-12-13 12:43:23 -06001495 continue;
1496 }
Mike Christie9c19a7d2008-05-21 15:54:09 -05001497 rc = iscsi_xmit_task(conn);
Mike Christie77a23c22007-05-30 12:57:18 -05001498 if (rc)
Mike Christie70b31c12009-08-20 15:11:03 -05001499 goto done;
Mike Christie77a23c22007-05-30 12:57:18 -05001500 /*
Mike Christie9c19a7d2008-05-21 15:54:09 -05001501 * we could continuously get new task requests so
Mike Christie77a23c22007-05-30 12:57:18 -05001502 * we need to check the mgmt queue for nops that need to
1503 * be sent to aviod starvation
1504 */
Mike Christie843c0a82007-12-13 12:43:20 -06001505 if (!list_empty(&conn->mgmtqueue))
1506 goto check_mgmt;
1507 }
1508
1509 while (!list_empty(&conn->requeue)) {
Mike Christieb3a7ea82007-12-13 12:43:26 -06001510 /*
1511 * we always do fastlogout - conn stop code will clean up.
1512 */
1513 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
1514 break;
1515
Mike Christie5d12c052009-11-11 16:34:32 -06001516 task = list_entry(conn->requeue.next, struct iscsi_task,
1517 running);
1518 if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT))
1519 break;
1520
1521 conn->task = task;
Mike Christie3bbaaad2009-05-13 17:57:46 -05001522 list_del_init(&conn->task->running);
Mike Christie9c19a7d2008-05-21 15:54:09 -05001523 conn->task->state = ISCSI_TASK_RUNNING;
Mike Christie9c19a7d2008-05-21 15:54:09 -05001524 rc = iscsi_xmit_task(conn);
Mike Christie843c0a82007-12-13 12:43:20 -06001525 if (rc)
Mike Christie70b31c12009-08-20 15:11:03 -05001526 goto done;
Mike Christie843c0a82007-12-13 12:43:20 -06001527 if (!list_empty(&conn->mgmtqueue))
Mike Christie77a23c22007-05-30 12:57:18 -05001528 goto check_mgmt;
Mike Christie7996a772006-04-06 21:13:41 -05001529 }
Mike Christieb6c395e2006-07-24 15:47:15 -05001530 spin_unlock_bh(&conn->session->lock);
Mike Christie3219e522006-05-30 00:37:28 -05001531 return -ENODATA;
Mike Christie7996a772006-04-06 21:13:41 -05001532
Mike Christie70b31c12009-08-20 15:11:03 -05001533done:
Mike Christie77a23c22007-05-30 12:57:18 -05001534 spin_unlock_bh(&conn->session->lock);
Mike Christie3219e522006-05-30 00:37:28 -05001535 return rc;
Mike Christie7996a772006-04-06 21:13:41 -05001536}
1537
David Howellsc4028952006-11-22 14:57:56 +00001538static void iscsi_xmitworker(struct work_struct *work)
Mike Christie7996a772006-04-06 21:13:41 -05001539{
David Howellsc4028952006-11-22 14:57:56 +00001540 struct iscsi_conn *conn =
1541 container_of(work, struct iscsi_conn, xmitwork);
Mike Christie3219e522006-05-30 00:37:28 -05001542 int rc;
Mike Christie7996a772006-04-06 21:13:41 -05001543 /*
1544 * serialize Xmit worker on a per-connection basis.
1545 */
Mike Christie3219e522006-05-30 00:37:28 -05001546 do {
1547 rc = iscsi_data_xmit(conn);
1548 } while (rc >= 0 || rc == -EAGAIN);
Mike Christie7996a772006-04-06 21:13:41 -05001549}
1550
Mike Christie577577d2008-12-02 00:32:05 -06001551static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn,
1552 struct scsi_cmnd *sc)
1553{
1554 struct iscsi_task *task;
1555
Stefani Seibold7acd72e2009-12-21 14:37:28 -08001556 if (!kfifo_out(&conn->session->cmdpool.queue,
Mike Christie577577d2008-12-02 00:32:05 -06001557 (void *) &task, sizeof(void *)))
1558 return NULL;
1559
1560 sc->SCp.phase = conn->session->age;
1561 sc->SCp.ptr = (char *) task;
1562
1563 atomic_set(&task->refcount, 1);
1564 task->state = ISCSI_TASK_PENDING;
1565 task->conn = conn;
1566 task->sc = sc;
Mike Christied355e572009-06-15 22:11:08 -05001567 task->have_checked_conn = false;
1568 task->last_timeout = jiffies;
1569 task->last_xfer = jiffies;
Mike Christie577577d2008-12-02 00:32:05 -06001570 INIT_LIST_HEAD(&task->running);
1571 return task;
1572}
1573
Mike Christie7996a772006-04-06 21:13:41 -05001574enum {
1575 FAILURE_BAD_HOST = 1,
1576 FAILURE_SESSION_FAILED,
1577 FAILURE_SESSION_FREED,
1578 FAILURE_WINDOW_CLOSED,
Mike Christie60ecebf2006-08-31 18:09:25 -04001579 FAILURE_OOM,
Mike Christie7996a772006-04-06 21:13:41 -05001580 FAILURE_SESSION_TERMINATE,
Mike Christie656cffc2006-05-18 20:31:42 -05001581 FAILURE_SESSION_IN_RECOVERY,
Mike Christie7996a772006-04-06 21:13:41 -05001582 FAILURE_SESSION_RECOVERY_TIMEOUT,
Mike Christieb3a7ea82007-12-13 12:43:26 -06001583 FAILURE_SESSION_LOGGING_OUT,
Mike Christie6eabafb2008-01-31 13:36:43 -06001584 FAILURE_SESSION_NOT_READY,
Mike Christie7996a772006-04-06 21:13:41 -05001585};
1586
Mike Christief41d4722010-12-31 02:22:21 -06001587int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc)
Mike Christie7996a772006-04-06 21:13:41 -05001588{
Mike Christie75613522008-05-21 15:53:59 -05001589 struct iscsi_cls_session *cls_session;
Mike Christie1336aed2009-05-13 17:57:48 -05001590 struct iscsi_host *ihost;
Mike Christie7996a772006-04-06 21:13:41 -05001591 int reason = 0;
1592 struct iscsi_session *session;
1593 struct iscsi_conn *conn;
Mike Christie9c19a7d2008-05-21 15:54:09 -05001594 struct iscsi_task *task = NULL;
Mike Christie7996a772006-04-06 21:13:41 -05001595
Mike Christie7996a772006-04-06 21:13:41 -05001596 sc->result = 0;
Mike Christief47f2cf2006-08-31 18:09:33 -04001597 sc->SCp.ptr = NULL;
Mike Christie7996a772006-04-06 21:13:41 -05001598
Mike Christie1336aed2009-05-13 17:57:48 -05001599 ihost = shost_priv(host);
Mike Christie7996a772006-04-06 21:13:41 -05001600
Mike Christie75613522008-05-21 15:53:59 -05001601 cls_session = starget_to_session(scsi_target(sc->device));
1602 session = cls_session->dd_data;
Mike Christief41d4722010-12-31 02:22:21 -06001603 spin_lock_bh(&session->lock);
Mike Christie7996a772006-04-06 21:13:41 -05001604
Mike Christie75613522008-05-21 15:53:59 -05001605 reason = iscsi_session_chkready(cls_session);
Mike Christie6eabafb2008-01-31 13:36:43 -06001606 if (reason) {
1607 sc->result = reason;
1608 goto fault;
1609 }
1610
Mike Christie301e0f72009-05-13 17:57:47 -05001611 if (session->state != ISCSI_STATE_LOGGED_IN) {
Mike Christie656cffc2006-05-18 20:31:42 -05001612 /*
1613 * to handle the race between when we set the recovery state
1614 * and block the session we requeue here (commands could
1615 * be entering our queuecommand while a block is starting
1616 * up because the block code is not locked)
1617 */
Mike Christie9000bcd2007-12-13 12:43:32 -06001618 switch (session->state) {
Mike Christie301e0f72009-05-13 17:57:47 -05001619 case ISCSI_STATE_FAILED:
Mike Christie9000bcd2007-12-13 12:43:32 -06001620 case ISCSI_STATE_IN_RECOVERY:
Mike Christie656cffc2006-05-18 20:31:42 -05001621 reason = FAILURE_SESSION_IN_RECOVERY;
Mike Christie301e0f72009-05-13 17:57:47 -05001622 sc->result = DID_IMM_RETRY << 16;
1623 break;
Mike Christie9000bcd2007-12-13 12:43:32 -06001624 case ISCSI_STATE_LOGGING_OUT:
1625 reason = FAILURE_SESSION_LOGGING_OUT;
Mike Christie301e0f72009-05-13 17:57:47 -05001626 sc->result = DID_IMM_RETRY << 16;
1627 break;
Mike Christieb3a7ea82007-12-13 12:43:26 -06001628 case ISCSI_STATE_RECOVERY_FAILED:
Mike Christie656cffc2006-05-18 20:31:42 -05001629 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
Mike Christie56d7fcf2008-08-19 18:45:26 -05001630 sc->result = DID_TRANSPORT_FAILFAST << 16;
Mike Christieb3a7ea82007-12-13 12:43:26 -06001631 break;
1632 case ISCSI_STATE_TERMINATE:
Mike Christie656cffc2006-05-18 20:31:42 -05001633 reason = FAILURE_SESSION_TERMINATE;
Mike Christie6eabafb2008-01-31 13:36:43 -06001634 sc->result = DID_NO_CONNECT << 16;
Mike Christieb3a7ea82007-12-13 12:43:26 -06001635 break;
Mike Christieb3a7ea82007-12-13 12:43:26 -06001636 default:
Mike Christie656cffc2006-05-18 20:31:42 -05001637 reason = FAILURE_SESSION_FREED;
Mike Christie6eabafb2008-01-31 13:36:43 -06001638 sc->result = DID_NO_CONNECT << 16;
Mike Christieb3a7ea82007-12-13 12:43:26 -06001639 }
Mike Christie7996a772006-04-06 21:13:41 -05001640 goto fault;
1641 }
1642
Mike Christie7996a772006-04-06 21:13:41 -05001643 conn = session->leadconn;
Mike Christie98644042006-10-16 18:09:39 -04001644 if (!conn) {
1645 reason = FAILURE_SESSION_FREED;
Mike Christie6eabafb2008-01-31 13:36:43 -06001646 sc->result = DID_NO_CONNECT << 16;
Mike Christie98644042006-10-16 18:09:39 -04001647 goto fault;
1648 }
Mike Christie7996a772006-04-06 21:13:41 -05001649
Mike Christie661134a2009-09-05 07:35:33 +05301650 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1651 reason = FAILURE_SESSION_IN_RECOVERY;
1652 sc->result = DID_REQUEUE;
1653 goto fault;
1654 }
1655
Mike Christie77a23c22007-05-30 12:57:18 -05001656 if (iscsi_check_cmdsn_window_closed(conn)) {
1657 reason = FAILURE_WINDOW_CLOSED;
1658 goto reject;
1659 }
1660
Mike Christie577577d2008-12-02 00:32:05 -06001661 task = iscsi_alloc_task(conn, sc);
1662 if (!task) {
Mike Christie60ecebf2006-08-31 18:09:25 -04001663 reason = FAILURE_OOM;
1664 goto reject;
1665 }
Mike Christie7996a772006-04-06 21:13:41 -05001666
Mike Christie1336aed2009-05-13 17:57:48 -05001667 if (!ihost->workq) {
Mike Christie577577d2008-12-02 00:32:05 -06001668 reason = iscsi_prep_scsi_cmd_pdu(task);
1669 if (reason) {
Mike Christie5d12c052009-11-11 16:34:32 -06001670 if (reason == -ENOMEM || reason == -EACCES) {
Mike Christie577577d2008-12-02 00:32:05 -06001671 reason = FAILURE_OOM;
1672 goto prepd_reject;
1673 } else {
1674 sc->result = DID_ABORT << 16;
1675 goto prepd_fault;
1676 }
Mike Christie052d0142008-05-21 15:54:05 -05001677 }
Mike Christie9c19a7d2008-05-21 15:54:09 -05001678 if (session->tt->xmit_task(task)) {
Mike Christied3305f32009-08-20 15:10:58 -05001679 session->cmdsn--;
Mike Christie052d0142008-05-21 15:54:05 -05001680 reason = FAILURE_SESSION_NOT_READY;
Mike Christie577577d2008-12-02 00:32:05 -06001681 goto prepd_reject;
Mike Christie052d0142008-05-21 15:54:05 -05001682 }
Mike Christie3bbaaad2009-05-13 17:57:46 -05001683 } else {
1684 list_add_tail(&task->running, &conn->cmdqueue);
Mike Christie32ae7632009-03-05 14:46:03 -06001685 iscsi_conn_queue_work(conn);
Mike Christie3bbaaad2009-05-13 17:57:46 -05001686 }
Mike Christie052d0142008-05-21 15:54:05 -05001687
1688 session->queued_cmdsn++;
Mike Christief41d4722010-12-31 02:22:21 -06001689 spin_unlock_bh(&session->lock);
Mike Christie7996a772006-04-06 21:13:41 -05001690 return 0;
1691
Mike Christie577577d2008-12-02 00:32:05 -06001692prepd_reject:
Mike Christief41d4722010-12-31 02:22:21 -06001693 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
Mike Christie7996a772006-04-06 21:13:41 -05001694reject:
Mike Christief41d4722010-12-31 02:22:21 -06001695 spin_unlock_bh(&session->lock);
Mike Christie1b2c7af2009-03-05 14:45:58 -06001696 ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n",
1697 sc->cmnd[0], reason);
Mike Christied6d13ee2008-08-17 15:24:43 -05001698 return SCSI_MLQUEUE_TARGET_BUSY;
Mike Christie7996a772006-04-06 21:13:41 -05001699
Mike Christie577577d2008-12-02 00:32:05 -06001700prepd_fault:
Mike Christief41d4722010-12-31 02:22:21 -06001701 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
Mike Christie7996a772006-04-06 21:13:41 -05001702fault:
Mike Christief41d4722010-12-31 02:22:21 -06001703 spin_unlock_bh(&session->lock);
Mike Christie1b2c7af2009-03-05 14:45:58 -06001704 ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n",
1705 sc->cmnd[0], reason);
Boaz Harroshc07d4442008-04-18 10:11:52 -05001706 if (!scsi_bidi_cmnd(sc))
1707 scsi_set_resid(sc, scsi_bufflen(sc));
1708 else {
1709 scsi_out(sc)->resid = scsi_out(sc)->length;
1710 scsi_in(sc)->resid = scsi_in(sc)->length;
1711 }
Mike Christief41d4722010-12-31 02:22:21 -06001712 sc->scsi_done(sc);
Mike Christie7996a772006-04-06 21:13:41 -05001713 return 0;
1714}
1715EXPORT_SYMBOL_GPL(iscsi_queuecommand);
1716
Mike Christiee881a172009-10-15 17:46:39 -07001717int iscsi_change_queue_depth(struct scsi_device *sdev, int depth, int reason)
Mike Christie7996a772006-04-06 21:13:41 -05001718{
Mike Christie1796e722009-11-11 16:34:36 -06001719 switch (reason) {
1720 case SCSI_QDEPTH_DEFAULT:
1721 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
1722 break;
1723 case SCSI_QDEPTH_QFULL:
1724 scsi_track_queue_full(sdev, depth);
1725 break;
1726 case SCSI_QDEPTH_RAMP_UP:
1727 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
1728 break;
1729 default:
Mike Christiee881a172009-10-15 17:46:39 -07001730 return -EOPNOTSUPP;
Mike Christie1796e722009-11-11 16:34:36 -06001731 }
Mike Christie7996a772006-04-06 21:13:41 -05001732 return sdev->queue_depth;
1733}
1734EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
1735
Mike Christie6b5d6c42009-04-21 15:32:32 -05001736int iscsi_target_alloc(struct scsi_target *starget)
1737{
1738 struct iscsi_cls_session *cls_session = starget_to_session(starget);
1739 struct iscsi_session *session = cls_session->dd_data;
1740
1741 starget->can_queue = session->scsi_cmds_max;
1742 return 0;
1743}
1744EXPORT_SYMBOL_GPL(iscsi_target_alloc);
1745
Mike Christie843c0a82007-12-13 12:43:20 -06001746static void iscsi_tmf_timedout(unsigned long data)
Mike Christie7996a772006-04-06 21:13:41 -05001747{
Mike Christie843c0a82007-12-13 12:43:20 -06001748 struct iscsi_conn *conn = (struct iscsi_conn *)data;
Mike Christie7996a772006-04-06 21:13:41 -05001749 struct iscsi_session *session = conn->session;
1750
1751 spin_lock(&session->lock);
Mike Christie843c0a82007-12-13 12:43:20 -06001752 if (conn->tmf_state == TMF_QUEUED) {
1753 conn->tmf_state = TMF_TIMEDOUT;
Erez Zilberbd2199d2009-06-15 22:11:10 -05001754 ISCSI_DBG_EH(session, "tmf timedout\n");
Mike Christie7996a772006-04-06 21:13:41 -05001755 /* unblock eh_abort() */
1756 wake_up(&conn->ehwait);
1757 }
1758 spin_unlock(&session->lock);
1759}
1760
Mike Christie9c19a7d2008-05-21 15:54:09 -05001761static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
Mike Christief6d51802007-12-13 12:43:30 -06001762 struct iscsi_tm *hdr, int age,
1763 int timeout)
Mike Christie7996a772006-04-06 21:13:41 -05001764{
Mike Christie7996a772006-04-06 21:13:41 -05001765 struct iscsi_session *session = conn->session;
Mike Christie9c19a7d2008-05-21 15:54:09 -05001766 struct iscsi_task *task;
Mike Christie7996a772006-04-06 21:13:41 -05001767
Mike Christie9c19a7d2008-05-21 15:54:09 -05001768 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
Mike Christie843c0a82007-12-13 12:43:20 -06001769 NULL, 0);
Mike Christie9c19a7d2008-05-21 15:54:09 -05001770 if (!task) {
Mike Christie6724add2007-08-15 01:38:30 -05001771 spin_unlock_bh(&session->lock);
Mike Christiedf4da5c2010-12-31 02:22:18 -06001772 iscsi_conn_printk(KERN_ERR, conn, "Could not send TMF.\n");
Mike Christie7996a772006-04-06 21:13:41 -05001773 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
Mike Christie843c0a82007-12-13 12:43:20 -06001774 spin_lock_bh(&session->lock);
Mike Christie77a23c22007-05-30 12:57:18 -05001775 return -EPERM;
Mike Christie7996a772006-04-06 21:13:41 -05001776 }
Mike Christie843c0a82007-12-13 12:43:20 -06001777 conn->tmfcmd_pdus_cnt++;
Mike Christief6d51802007-12-13 12:43:30 -06001778 conn->tmf_timer.expires = timeout * HZ + jiffies;
Mike Christie843c0a82007-12-13 12:43:20 -06001779 conn->tmf_timer.function = iscsi_tmf_timedout;
1780 conn->tmf_timer.data = (unsigned long)conn;
1781 add_timer(&conn->tmf_timer);
Erez Zilberbd2199d2009-06-15 22:11:10 -05001782 ISCSI_DBG_EH(session, "tmf set timeout\n");
Mike Christie7996a772006-04-06 21:13:41 -05001783
Mike Christie7996a772006-04-06 21:13:41 -05001784 spin_unlock_bh(&session->lock);
Mike Christie6724add2007-08-15 01:38:30 -05001785 mutex_unlock(&session->eh_mutex);
Mike Christie7996a772006-04-06 21:13:41 -05001786
1787 /*
1788 * block eh thread until:
1789 *
Mike Christie843c0a82007-12-13 12:43:20 -06001790 * 1) tmf response
1791 * 2) tmf timeout
Mike Christie7996a772006-04-06 21:13:41 -05001792 * 3) session is terminated or restarted or userspace has
1793 * given up on recovery
1794 */
Mike Christie843c0a82007-12-13 12:43:20 -06001795 wait_event_interruptible(conn->ehwait, age != session->age ||
Mike Christie7996a772006-04-06 21:13:41 -05001796 session->state != ISCSI_STATE_LOGGED_IN ||
Mike Christie843c0a82007-12-13 12:43:20 -06001797 conn->tmf_state != TMF_QUEUED);
Mike Christie7996a772006-04-06 21:13:41 -05001798 if (signal_pending(current))
1799 flush_signals(current);
Mike Christie843c0a82007-12-13 12:43:20 -06001800 del_timer_sync(&conn->tmf_timer);
1801
Mike Christie6724add2007-08-15 01:38:30 -05001802 mutex_lock(&session->eh_mutex);
Mike Christie77a23c22007-05-30 12:57:18 -05001803 spin_lock_bh(&session->lock);
Mike Christie9c19a7d2008-05-21 15:54:09 -05001804 /* if the session drops it will clean up the task */
Mike Christie843c0a82007-12-13 12:43:20 -06001805 if (age != session->age ||
1806 session->state != ISCSI_STATE_LOGGED_IN)
1807 return -ENOTCONN;
Mike Christie7996a772006-04-06 21:13:41 -05001808 return 0;
1809}
1810
1811/*
Mike Christie843c0a82007-12-13 12:43:20 -06001812 * Fail commands. session lock held and recv side suspended and xmit
1813 * thread flushed
1814 */
Mike Christie3bbaaad2009-05-13 17:57:46 -05001815static void fail_scsi_tasks(struct iscsi_conn *conn, unsigned lun,
1816 int error)
Mike Christie843c0a82007-12-13 12:43:20 -06001817{
Mike Christie3bbaaad2009-05-13 17:57:46 -05001818 struct iscsi_task *task;
1819 int i;
Mike Christie843c0a82007-12-13 12:43:20 -06001820
Mike Christie3bbaaad2009-05-13 17:57:46 -05001821 for (i = 0; i < conn->session->cmds_max; i++) {
1822 task = conn->session->cmds[i];
1823 if (!task->sc || task->state == ISCSI_TASK_FREE)
1824 continue;
Mike Christie843c0a82007-12-13 12:43:20 -06001825
Mike Christie3bbaaad2009-05-13 17:57:46 -05001826 if (lun != -1 && lun != task->sc->device->lun)
1827 continue;
Mike Christie843c0a82007-12-13 12:43:20 -06001828
Mike Christie3bbaaad2009-05-13 17:57:46 -05001829 ISCSI_DBG_SESSION(conn->session,
1830 "failing sc %p itt 0x%x state %d\n",
1831 task->sc, task->itt, task->state);
Mike Christieb3cd5052009-05-13 17:57:49 -05001832 fail_scsi_task(task, error);
Mike Christie843c0a82007-12-13 12:43:20 -06001833 }
1834}
1835
Mike Christie661134a2009-09-05 07:35:33 +05301836/**
1837 * iscsi_suspend_queue - suspend iscsi_queuecommand
1838 * @conn: iscsi conn to stop queueing IO on
1839 *
1840 * This grabs the session lock to make sure no one is in
1841 * xmit_task/queuecommand, and then sets suspend to prevent
1842 * new commands from being queued. This only needs to be called
1843 * by offload drivers that need to sync a path like ep disconnect
1844 * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi
1845 * will call iscsi_start_tx and iscsi_unblock_session when in FFP.
1846 */
1847void iscsi_suspend_queue(struct iscsi_conn *conn)
1848{
1849 spin_lock_bh(&conn->session->lock);
1850 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1851 spin_unlock_bh(&conn->session->lock);
1852}
1853EXPORT_SYMBOL_GPL(iscsi_suspend_queue);
1854
1855/**
1856 * iscsi_suspend_tx - suspend iscsi_data_xmit
1857 * @conn: iscsi conn tp stop processing IO on.
1858 *
1859 * This function sets the suspend bit to prevent iscsi_data_xmit
1860 * from sending new IO, and if work is queued on the xmit thread
1861 * it will wait for it to be completed.
1862 */
Mike Christieb40977d2008-05-21 15:54:03 -05001863void iscsi_suspend_tx(struct iscsi_conn *conn)
Mike Christie6724add2007-08-15 01:38:30 -05001864{
Mike Christie32ae7632009-03-05 14:46:03 -06001865 struct Scsi_Host *shost = conn->session->host;
1866 struct iscsi_host *ihost = shost_priv(shost);
1867
Mike Christie6724add2007-08-15 01:38:30 -05001868 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
Mike Christie1336aed2009-05-13 17:57:48 -05001869 if (ihost->workq)
Mike Christie32ae7632009-03-05 14:46:03 -06001870 flush_workqueue(ihost->workq);
Mike Christie6724add2007-08-15 01:38:30 -05001871}
Mike Christieb40977d2008-05-21 15:54:03 -05001872EXPORT_SYMBOL_GPL(iscsi_suspend_tx);
Mike Christie6724add2007-08-15 01:38:30 -05001873
1874static void iscsi_start_tx(struct iscsi_conn *conn)
1875{
1876 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
Mike Christie1336aed2009-05-13 17:57:48 -05001877 iscsi_conn_queue_work(conn);
Mike Christie6724add2007-08-15 01:38:30 -05001878}
1879
Mike Christie4c48a822009-05-13 17:57:45 -05001880/*
1881 * We want to make sure a ping is in flight. It has timed out.
1882 * And we are not busy processing a pdu that is making
1883 * progress but got started before the ping and is taking a while
1884 * to complete so the ping is just stuck behind it in a queue.
1885 */
1886static int iscsi_has_ping_timed_out(struct iscsi_conn *conn)
1887{
1888 if (conn->ping_task &&
1889 time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
1890 (conn->ping_timeout * HZ), jiffies))
1891 return 1;
1892 else
1893 return 0;
1894}
1895
Mike Christied355e572009-06-15 22:11:08 -05001896static enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc)
Mike Christief6d51802007-12-13 12:43:30 -06001897{
Mike Christied355e572009-06-15 22:11:08 -05001898 enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED;
Mike Christie92ed4d62010-02-10 16:51:45 -06001899 struct iscsi_task *task = NULL, *running_task;
Mike Christief6d51802007-12-13 12:43:30 -06001900 struct iscsi_cls_session *cls_session;
1901 struct iscsi_session *session;
1902 struct iscsi_conn *conn;
Mike Christie92ed4d62010-02-10 16:51:45 -06001903 int i;
Mike Christief6d51802007-12-13 12:43:30 -06001904
Mike Christied355e572009-06-15 22:11:08 -05001905 cls_session = starget_to_session(scsi_target(sc->device));
Mike Christie75613522008-05-21 15:53:59 -05001906 session = cls_session->dd_data;
Mike Christief6d51802007-12-13 12:43:30 -06001907
Erez Zilberbd2199d2009-06-15 22:11:10 -05001908 ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc);
Mike Christief6d51802007-12-13 12:43:30 -06001909
1910 spin_lock(&session->lock);
Mike Christiee3d338a2012-01-26 21:13:11 -06001911 task = (struct iscsi_task *)sc->SCp.ptr;
1912 if (!task) {
1913 /*
1914 * Raced with completion. Blk layer has taken ownership
1915 * so let timeout code complete it now.
1916 */
1917 rc = BLK_EH_HANDLED;
1918 goto done;
1919 }
1920
Mike Christief6d51802007-12-13 12:43:30 -06001921 if (session->state != ISCSI_STATE_LOGGED_IN) {
1922 /*
1923 * We are probably in the middle of iscsi recovery so let
1924 * that complete and handle the error.
1925 */
Jens Axboe242f9dc2008-09-14 05:55:09 -07001926 rc = BLK_EH_RESET_TIMER;
Mike Christief6d51802007-12-13 12:43:30 -06001927 goto done;
1928 }
1929
1930 conn = session->leadconn;
1931 if (!conn) {
1932 /* In the middle of shuting down */
Jens Axboe242f9dc2008-09-14 05:55:09 -07001933 rc = BLK_EH_RESET_TIMER;
Mike Christief6d51802007-12-13 12:43:30 -06001934 goto done;
1935 }
1936
Mike Christied355e572009-06-15 22:11:08 -05001937 /*
1938 * If we have sent (at least queued to the network layer) a pdu or
1939 * recvd one for the task since the last timeout ask for
1940 * more time. If on the next timeout we have not made progress
1941 * we can check if it is the task or connection when we send the
1942 * nop as a ping.
1943 */
Mike Christie92ed4d62010-02-10 16:51:45 -06001944 if (time_after(task->last_xfer, task->last_timeout)) {
Erez Zilberbd2199d2009-06-15 22:11:10 -05001945 ISCSI_DBG_EH(session, "Command making progress. Asking "
1946 "scsi-ml for more time to complete. "
Mike Christie92ed4d62010-02-10 16:51:45 -06001947 "Last data xfer at %lu. Last timeout was at "
Erez Zilberbd2199d2009-06-15 22:11:10 -05001948 "%lu\n.", task->last_xfer, task->last_timeout);
Mike Christied355e572009-06-15 22:11:08 -05001949 task->have_checked_conn = false;
1950 rc = BLK_EH_RESET_TIMER;
1951 goto done;
1952 }
1953
Mike Christief6d51802007-12-13 12:43:30 -06001954 if (!conn->recv_timeout && !conn->ping_timeout)
1955 goto done;
1956 /*
1957 * if the ping timedout then we are in the middle of cleaning up
1958 * and can let the iscsi eh handle it
1959 */
Mike Christie4c48a822009-05-13 17:57:45 -05001960 if (iscsi_has_ping_timed_out(conn)) {
Jens Axboe242f9dc2008-09-14 05:55:09 -07001961 rc = BLK_EH_RESET_TIMER;
Mike Christie4c48a822009-05-13 17:57:45 -05001962 goto done;
1963 }
Mike Christied355e572009-06-15 22:11:08 -05001964
Mike Christie92ed4d62010-02-10 16:51:45 -06001965 for (i = 0; i < conn->session->cmds_max; i++) {
1966 running_task = conn->session->cmds[i];
1967 if (!running_task->sc || running_task == task ||
1968 running_task->state != ISCSI_TASK_RUNNING)
1969 continue;
1970
1971 /*
1972 * Only check if cmds started before this one have made
1973 * progress, or this could never fail
1974 */
1975 if (time_after(running_task->sc->jiffies_at_alloc,
1976 task->sc->jiffies_at_alloc))
1977 continue;
1978
1979 if (time_after(running_task->last_xfer, task->last_timeout)) {
1980 /*
1981 * This task has not made progress, but a task
1982 * started before us has transferred data since
1983 * we started/last-checked. We could be queueing
1984 * too many tasks or the LU is bad.
1985 *
1986 * If the device is bad the cmds ahead of us on
1987 * other devs will complete, and this loop will
1988 * eventually fail starting the scsi eh.
1989 */
1990 ISCSI_DBG_EH(session, "Command has not made progress "
1991 "but commands ahead of it have. "
1992 "Asking scsi-ml for more time to "
1993 "complete. Our last xfer vs running task "
1994 "last xfer %lu/%lu. Last check %lu.\n",
1995 task->last_xfer, running_task->last_xfer,
1996 task->last_timeout);
1997 rc = BLK_EH_RESET_TIMER;
1998 goto done;
1999 }
2000 }
2001
Mike Christied355e572009-06-15 22:11:08 -05002002 /* Assumes nop timeout is shorter than scsi cmd timeout */
2003 if (task->have_checked_conn)
2004 goto done;
2005
Mike Christief6d51802007-12-13 12:43:30 -06002006 /*
Mike Christied355e572009-06-15 22:11:08 -05002007 * Checking the transport already or nop from a cmd timeout still
2008 * running
Mike Christief6d51802007-12-13 12:43:30 -06002009 */
Mike Christied355e572009-06-15 22:11:08 -05002010 if (conn->ping_task) {
2011 task->have_checked_conn = true;
Jens Axboe242f9dc2008-09-14 05:55:09 -07002012 rc = BLK_EH_RESET_TIMER;
Mike Christie4c48a822009-05-13 17:57:45 -05002013 goto done;
2014 }
2015
Mike Christied355e572009-06-15 22:11:08 -05002016 /* Make sure there is a transport check done */
2017 iscsi_send_nopout(conn, NULL);
2018 task->have_checked_conn = true;
2019 rc = BLK_EH_RESET_TIMER;
2020
Mike Christief6d51802007-12-13 12:43:30 -06002021done:
Mike Christied355e572009-06-15 22:11:08 -05002022 if (task)
2023 task->last_timeout = jiffies;
Mike Christief6d51802007-12-13 12:43:30 -06002024 spin_unlock(&session->lock);
Erez Zilberbd2199d2009-06-15 22:11:10 -05002025 ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ?
2026 "timer reset" : "nh");
Mike Christief6d51802007-12-13 12:43:30 -06002027 return rc;
2028}
2029
2030static void iscsi_check_transport_timeouts(unsigned long data)
2031{
2032 struct iscsi_conn *conn = (struct iscsi_conn *)data;
2033 struct iscsi_session *session = conn->session;
Mike Christie4cf10432008-05-07 20:43:52 -05002034 unsigned long recv_timeout, next_timeout = 0, last_recv;
Mike Christief6d51802007-12-13 12:43:30 -06002035
2036 spin_lock(&session->lock);
2037 if (session->state != ISCSI_STATE_LOGGED_IN)
2038 goto done;
2039
Mike Christie4cf10432008-05-07 20:43:52 -05002040 recv_timeout = conn->recv_timeout;
2041 if (!recv_timeout)
Mike Christief6d51802007-12-13 12:43:30 -06002042 goto done;
2043
Mike Christie4cf10432008-05-07 20:43:52 -05002044 recv_timeout *= HZ;
Mike Christief6d51802007-12-13 12:43:30 -06002045 last_recv = conn->last_recv;
Mike Christie4c48a822009-05-13 17:57:45 -05002046
2047 if (iscsi_has_ping_timed_out(conn)) {
Mike Christie322d7392008-01-31 13:36:52 -06002048 iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs "
Mike Christie4c48a822009-05-13 17:57:45 -05002049 "expired, recv timeout %d, last rx %lu, "
2050 "last ping %lu, now %lu\n",
2051 conn->ping_timeout, conn->recv_timeout,
2052 last_recv, conn->last_ping, jiffies);
Mike Christief6d51802007-12-13 12:43:30 -06002053 spin_unlock(&session->lock);
2054 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
2055 return;
2056 }
2057
Mike Christie4cf10432008-05-07 20:43:52 -05002058 if (time_before_eq(last_recv + recv_timeout, jiffies)) {
Mike Christiec8611f92008-05-08 20:15:34 -05002059 /* send a ping to try to provoke some traffic */
Mike Christie1b2c7af2009-03-05 14:45:58 -06002060 ISCSI_DBG_CONN(conn, "Sending nopout as ping\n");
Mike Christiec8611f92008-05-08 20:15:34 -05002061 iscsi_send_nopout(conn, NULL);
Mike Christie4cf10432008-05-07 20:43:52 -05002062 next_timeout = conn->last_ping + (conn->ping_timeout * HZ);
Mike Christiead294e92008-01-31 13:36:50 -06002063 } else
Mike Christie4cf10432008-05-07 20:43:52 -05002064 next_timeout = last_recv + recv_timeout;
Mike Christief6d51802007-12-13 12:43:30 -06002065
Mike Christie1b2c7af2009-03-05 14:45:58 -06002066 ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout);
Mike Christiead294e92008-01-31 13:36:50 -06002067 mod_timer(&conn->transport_timer, next_timeout);
Mike Christief6d51802007-12-13 12:43:30 -06002068done:
2069 spin_unlock(&session->lock);
2070}
2071
Mike Christie9c19a7d2008-05-21 15:54:09 -05002072static void iscsi_prep_abort_task_pdu(struct iscsi_task *task,
Mike Christie843c0a82007-12-13 12:43:20 -06002073 struct iscsi_tm *hdr)
2074{
2075 memset(hdr, 0, sizeof(*hdr));
2076 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2077 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
2078 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
Andy Grover55bdabd2011-06-16 15:57:09 -07002079 hdr->lun = task->lun;
Mike Christie577577d2008-12-02 00:32:05 -06002080 hdr->rtt = task->hdr_itt;
2081 hdr->refcmdsn = task->cmdsn;
Mike Christie843c0a82007-12-13 12:43:20 -06002082}
2083
Mike Christie7996a772006-04-06 21:13:41 -05002084int iscsi_eh_abort(struct scsi_cmnd *sc)
2085{
Mike Christie75613522008-05-21 15:53:59 -05002086 struct iscsi_cls_session *cls_session;
2087 struct iscsi_session *session;
Mike Christief47f2cf2006-08-31 18:09:33 -04002088 struct iscsi_conn *conn;
Mike Christie9c19a7d2008-05-21 15:54:09 -05002089 struct iscsi_task *task;
Mike Christie843c0a82007-12-13 12:43:20 -06002090 struct iscsi_tm *hdr;
2091 int rc, age;
Mike Christie7996a772006-04-06 21:13:41 -05002092
Mike Christie75613522008-05-21 15:53:59 -05002093 cls_session = starget_to_session(scsi_target(sc->device));
2094 session = cls_session->dd_data;
2095
Erez Zilberbd2199d2009-06-15 22:11:10 -05002096 ISCSI_DBG_EH(session, "aborting sc %p\n", sc);
Mike Christie4421c9e2009-05-13 17:57:50 -05002097
Mike Christie6724add2007-08-15 01:38:30 -05002098 mutex_lock(&session->eh_mutex);
2099 spin_lock_bh(&session->lock);
Mike Christief47f2cf2006-08-31 18:09:33 -04002100 /*
2101 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
2102 * got the command.
2103 */
2104 if (!sc->SCp.ptr) {
Erez Zilberbd2199d2009-06-15 22:11:10 -05002105 ISCSI_DBG_EH(session, "sc never reached iscsi layer or "
2106 "it completed.\n");
Mike Christie6724add2007-08-15 01:38:30 -05002107 spin_unlock_bh(&session->lock);
2108 mutex_unlock(&session->eh_mutex);
Mike Christief47f2cf2006-08-31 18:09:33 -04002109 return SUCCESS;
2110 }
2111
Mike Christie7996a772006-04-06 21:13:41 -05002112 /*
2113 * If we are not logged in or we have started a new session
2114 * then let the host reset code handle this
2115 */
Mike Christie843c0a82007-12-13 12:43:20 -06002116 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
2117 sc->SCp.phase != session->age) {
2118 spin_unlock_bh(&session->lock);
2119 mutex_unlock(&session->eh_mutex);
Erez Zilberbd2199d2009-06-15 22:11:10 -05002120 ISCSI_DBG_EH(session, "failing abort due to dropped "
Mike Christie4421c9e2009-05-13 17:57:50 -05002121 "session.\n");
Mike Christie843c0a82007-12-13 12:43:20 -06002122 return FAILED;
2123 }
2124
2125 conn = session->leadconn;
2126 conn->eh_abort_cnt++;
2127 age = session->age;
2128
Mike Christie9c19a7d2008-05-21 15:54:09 -05002129 task = (struct iscsi_task *)sc->SCp.ptr;
Erez Zilberbd2199d2009-06-15 22:11:10 -05002130 ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n",
2131 sc, task->itt);
Mike Christie7996a772006-04-06 21:13:41 -05002132
Mike Christie9c19a7d2008-05-21 15:54:09 -05002133 /* task completed before time out */
2134 if (!task->sc) {
Erez Zilberbd2199d2009-06-15 22:11:10 -05002135 ISCSI_DBG_EH(session, "sc completed while abort in progress\n");
Mike Christie77a23c22007-05-30 12:57:18 -05002136 goto success;
Mike Christie7ea8b822006-07-24 15:47:22 -05002137 }
Mike Christie7996a772006-04-06 21:13:41 -05002138
Mike Christie9c19a7d2008-05-21 15:54:09 -05002139 if (task->state == ISCSI_TASK_PENDING) {
Mike Christieb3cd5052009-05-13 17:57:49 -05002140 fail_scsi_task(task, DID_ABORT);
Mike Christie77a23c22007-05-30 12:57:18 -05002141 goto success;
2142 }
Mike Christie7996a772006-04-06 21:13:41 -05002143
Mike Christie843c0a82007-12-13 12:43:20 -06002144 /* only have one tmf outstanding at a time */
2145 if (conn->tmf_state != TMF_INITIAL)
Mike Christie7996a772006-04-06 21:13:41 -05002146 goto failed;
Mike Christie843c0a82007-12-13 12:43:20 -06002147 conn->tmf_state = TMF_QUEUED;
Mike Christie7996a772006-04-06 21:13:41 -05002148
Mike Christie843c0a82007-12-13 12:43:20 -06002149 hdr = &conn->tmhdr;
Mike Christie9c19a7d2008-05-21 15:54:09 -05002150 iscsi_prep_abort_task_pdu(task, hdr);
Mike Christie843c0a82007-12-13 12:43:20 -06002151
Mike Christie9c19a7d2008-05-21 15:54:09 -05002152 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) {
Mike Christie843c0a82007-12-13 12:43:20 -06002153 rc = FAILED;
2154 goto failed;
2155 }
2156
2157 switch (conn->tmf_state) {
2158 case TMF_SUCCESS:
Mike Christie77a23c22007-05-30 12:57:18 -05002159 spin_unlock_bh(&session->lock);
Mike Christie913e5bf2008-05-21 15:54:18 -05002160 /*
2161 * stop tx side incase the target had sent a abort rsp but
2162 * the initiator was still writing out data.
2163 */
Mike Christie6724add2007-08-15 01:38:30 -05002164 iscsi_suspend_tx(conn);
Mike Christie77a23c22007-05-30 12:57:18 -05002165 /*
Mike Christie913e5bf2008-05-21 15:54:18 -05002166 * we do not stop the recv side because targets have been
2167 * good and have never sent us a successful tmf response
2168 * then sent more data for the cmd.
Mike Christie77a23c22007-05-30 12:57:18 -05002169 */
Mike Christie6187c242009-07-15 15:02:57 -05002170 spin_lock_bh(&session->lock);
Mike Christieb3cd5052009-05-13 17:57:49 -05002171 fail_scsi_task(task, DID_ABORT);
Mike Christie843c0a82007-12-13 12:43:20 -06002172 conn->tmf_state = TMF_INITIAL;
Mike Christie5d12c052009-11-11 16:34:32 -06002173 memset(hdr, 0, sizeof(*hdr));
Mike Christie6187c242009-07-15 15:02:57 -05002174 spin_unlock_bh(&session->lock);
Mike Christie6724add2007-08-15 01:38:30 -05002175 iscsi_start_tx(conn);
Mike Christie77a23c22007-05-30 12:57:18 -05002176 goto success_unlocked;
Mike Christie843c0a82007-12-13 12:43:20 -06002177 case TMF_TIMEDOUT:
2178 spin_unlock_bh(&session->lock);
Mike Christiedf4da5c2010-12-31 02:22:18 -06002179 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
Mike Christie843c0a82007-12-13 12:43:20 -06002180 goto failed_unlocked;
2181 case TMF_NOT_FOUND:
2182 if (!sc->SCp.ptr) {
2183 conn->tmf_state = TMF_INITIAL;
Mike Christie5d12c052009-11-11 16:34:32 -06002184 memset(hdr, 0, sizeof(*hdr));
Mike Christie9c19a7d2008-05-21 15:54:09 -05002185 /* task completed before tmf abort response */
Erez Zilberbd2199d2009-06-15 22:11:10 -05002186 ISCSI_DBG_EH(session, "sc completed while abort in "
2187 "progress\n");
Mike Christie77a23c22007-05-30 12:57:18 -05002188 goto success;
Mike Christie7ea8b822006-07-24 15:47:22 -05002189 }
2190 /* fall through */
2191 default:
Mike Christie843c0a82007-12-13 12:43:20 -06002192 conn->tmf_state = TMF_INITIAL;
2193 goto failed;
Mike Christie7996a772006-04-06 21:13:41 -05002194 }
2195
Mike Christie77a23c22007-05-30 12:57:18 -05002196success:
Mike Christie7996a772006-04-06 21:13:41 -05002197 spin_unlock_bh(&session->lock);
Mike Christie77a23c22007-05-30 12:57:18 -05002198success_unlocked:
Erez Zilberbd2199d2009-06-15 22:11:10 -05002199 ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n",
2200 sc, task->itt);
Mike Christie6724add2007-08-15 01:38:30 -05002201 mutex_unlock(&session->eh_mutex);
Mike Christie7996a772006-04-06 21:13:41 -05002202 return SUCCESS;
2203
2204failed:
2205 spin_unlock_bh(&session->lock);
Mike Christie77a23c22007-05-30 12:57:18 -05002206failed_unlocked:
Erez Zilberbd2199d2009-06-15 22:11:10 -05002207 ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc,
2208 task ? task->itt : 0);
Mike Christie6724add2007-08-15 01:38:30 -05002209 mutex_unlock(&session->eh_mutex);
Mike Christie7996a772006-04-06 21:13:41 -05002210 return FAILED;
2211}
2212EXPORT_SYMBOL_GPL(iscsi_eh_abort);
2213
Mike Christie843c0a82007-12-13 12:43:20 -06002214static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2215{
2216 memset(hdr, 0, sizeof(*hdr));
2217 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2218 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2219 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
Andy Grover55bdabd2011-06-16 15:57:09 -07002220 int_to_scsilun(sc->device->lun, &hdr->lun);
Mike Christief6d51802007-12-13 12:43:30 -06002221 hdr->rtt = RESERVED_ITT;
Mike Christie843c0a82007-12-13 12:43:20 -06002222}
2223
2224int iscsi_eh_device_reset(struct scsi_cmnd *sc)
2225{
Mike Christie75613522008-05-21 15:53:59 -05002226 struct iscsi_cls_session *cls_session;
2227 struct iscsi_session *session;
Mike Christie843c0a82007-12-13 12:43:20 -06002228 struct iscsi_conn *conn;
2229 struct iscsi_tm *hdr;
2230 int rc = FAILED;
2231
Mike Christie75613522008-05-21 15:53:59 -05002232 cls_session = starget_to_session(scsi_target(sc->device));
2233 session = cls_session->dd_data;
2234
Erez Zilberbd2199d2009-06-15 22:11:10 -05002235 ISCSI_DBG_EH(session, "LU Reset [sc %p lun %u]\n", sc, sc->device->lun);
Mike Christie843c0a82007-12-13 12:43:20 -06002236
2237 mutex_lock(&session->eh_mutex);
2238 spin_lock_bh(&session->lock);
2239 /*
2240 * Just check if we are not logged in. We cannot check for
2241 * the phase because the reset could come from a ioctl.
2242 */
2243 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2244 goto unlock;
2245 conn = session->leadconn;
2246
2247 /* only have one tmf outstanding at a time */
2248 if (conn->tmf_state != TMF_INITIAL)
2249 goto unlock;
2250 conn->tmf_state = TMF_QUEUED;
2251
2252 hdr = &conn->tmhdr;
2253 iscsi_prep_lun_reset_pdu(sc, hdr);
2254
Mike Christie9c19a7d2008-05-21 15:54:09 -05002255 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
Mike Christief6d51802007-12-13 12:43:30 -06002256 session->lu_reset_timeout)) {
Mike Christie843c0a82007-12-13 12:43:20 -06002257 rc = FAILED;
2258 goto unlock;
2259 }
2260
2261 switch (conn->tmf_state) {
2262 case TMF_SUCCESS:
2263 break;
2264 case TMF_TIMEDOUT:
2265 spin_unlock_bh(&session->lock);
Mike Christiedf4da5c2010-12-31 02:22:18 -06002266 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
Mike Christie843c0a82007-12-13 12:43:20 -06002267 goto done;
2268 default:
2269 conn->tmf_state = TMF_INITIAL;
2270 goto unlock;
2271 }
2272
2273 rc = SUCCESS;
2274 spin_unlock_bh(&session->lock);
2275
2276 iscsi_suspend_tx(conn);
Mike Christie913e5bf2008-05-21 15:54:18 -05002277
Mike Christiea3439142008-09-24 11:46:15 -05002278 spin_lock_bh(&session->lock);
Mike Christie5d12c052009-11-11 16:34:32 -06002279 memset(hdr, 0, sizeof(*hdr));
Mike Christie3bbaaad2009-05-13 17:57:46 -05002280 fail_scsi_tasks(conn, sc->device->lun, DID_ERROR);
Mike Christie843c0a82007-12-13 12:43:20 -06002281 conn->tmf_state = TMF_INITIAL;
Mike Christiea3439142008-09-24 11:46:15 -05002282 spin_unlock_bh(&session->lock);
Mike Christie843c0a82007-12-13 12:43:20 -06002283
2284 iscsi_start_tx(conn);
2285 goto done;
2286
2287unlock:
2288 spin_unlock_bh(&session->lock);
2289done:
Erez Zilberbd2199d2009-06-15 22:11:10 -05002290 ISCSI_DBG_EH(session, "dev reset result = %s\n",
2291 rc == SUCCESS ? "SUCCESS" : "FAILED");
Mike Christie843c0a82007-12-13 12:43:20 -06002292 mutex_unlock(&session->eh_mutex);
2293 return rc;
2294}
2295EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
2296
Mike Christie3fe5ae82009-11-11 16:34:33 -06002297void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
2298{
2299 struct iscsi_session *session = cls_session->dd_data;
2300
2301 spin_lock_bh(&session->lock);
2302 if (session->state != ISCSI_STATE_LOGGED_IN) {
2303 session->state = ISCSI_STATE_RECOVERY_FAILED;
2304 if (session->leadconn)
2305 wake_up(&session->leadconn->ehwait);
2306 }
2307 spin_unlock_bh(&session->lock);
2308}
2309EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
2310
2311/**
2312 * iscsi_eh_session_reset - drop session and attempt relogin
2313 * @sc: scsi command
2314 *
2315 * This function will wait for a relogin, session termination from
2316 * userspace, or a recovery/replacement timeout.
2317 */
Jayamohan Kallickal309ce152010-02-20 08:02:10 +05302318int iscsi_eh_session_reset(struct scsi_cmnd *sc)
Mike Christie3fe5ae82009-11-11 16:34:33 -06002319{
2320 struct iscsi_cls_session *cls_session;
2321 struct iscsi_session *session;
2322 struct iscsi_conn *conn;
2323
2324 cls_session = starget_to_session(scsi_target(sc->device));
2325 session = cls_session->dd_data;
2326 conn = session->leadconn;
2327
2328 mutex_lock(&session->eh_mutex);
2329 spin_lock_bh(&session->lock);
2330 if (session->state == ISCSI_STATE_TERMINATE) {
2331failed:
2332 ISCSI_DBG_EH(session,
2333 "failing session reset: Could not log back into "
2334 "%s, %s [age %d]\n", session->targetname,
2335 conn->persistent_address, session->age);
2336 spin_unlock_bh(&session->lock);
2337 mutex_unlock(&session->eh_mutex);
2338 return FAILED;
2339 }
2340
2341 spin_unlock_bh(&session->lock);
2342 mutex_unlock(&session->eh_mutex);
2343 /*
2344 * we drop the lock here but the leadconn cannot be destoyed while
2345 * we are in the scsi eh
2346 */
Mike Christiedf4da5c2010-12-31 02:22:18 -06002347 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002348
2349 ISCSI_DBG_EH(session, "wait for relogin\n");
2350 wait_event_interruptible(conn->ehwait,
2351 session->state == ISCSI_STATE_TERMINATE ||
2352 session->state == ISCSI_STATE_LOGGED_IN ||
2353 session->state == ISCSI_STATE_RECOVERY_FAILED);
2354 if (signal_pending(current))
2355 flush_signals(current);
2356
2357 mutex_lock(&session->eh_mutex);
2358 spin_lock_bh(&session->lock);
2359 if (session->state == ISCSI_STATE_LOGGED_IN) {
2360 ISCSI_DBG_EH(session,
2361 "session reset succeeded for %s,%s\n",
2362 session->targetname, conn->persistent_address);
2363 } else
2364 goto failed;
2365 spin_unlock_bh(&session->lock);
2366 mutex_unlock(&session->eh_mutex);
2367 return SUCCESS;
2368}
Jayamohan Kallickal309ce152010-02-20 08:02:10 +05302369EXPORT_SYMBOL_GPL(iscsi_eh_session_reset);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002370
2371static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2372{
2373 memset(hdr, 0, sizeof(*hdr));
2374 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2375 hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2376 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2377 hdr->rtt = RESERVED_ITT;
2378}
2379
2380/**
2381 * iscsi_eh_target_reset - reset target
2382 * @sc: scsi command
2383 *
Jayamohan Kallickal309ce152010-02-20 08:02:10 +05302384 * This will attempt to send a warm target reset.
Mike Christie3fe5ae82009-11-11 16:34:33 -06002385 */
2386int iscsi_eh_target_reset(struct scsi_cmnd *sc)
2387{
2388 struct iscsi_cls_session *cls_session;
2389 struct iscsi_session *session;
2390 struct iscsi_conn *conn;
2391 struct iscsi_tm *hdr;
2392 int rc = FAILED;
2393
2394 cls_session = starget_to_session(scsi_target(sc->device));
2395 session = cls_session->dd_data;
2396
2397 ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc,
2398 session->targetname);
2399
2400 mutex_lock(&session->eh_mutex);
2401 spin_lock_bh(&session->lock);
2402 /*
2403 * Just check if we are not logged in. We cannot check for
2404 * the phase because the reset could come from a ioctl.
2405 */
2406 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2407 goto unlock;
2408 conn = session->leadconn;
2409
2410 /* only have one tmf outstanding at a time */
2411 if (conn->tmf_state != TMF_INITIAL)
2412 goto unlock;
2413 conn->tmf_state = TMF_QUEUED;
2414
2415 hdr = &conn->tmhdr;
2416 iscsi_prep_tgt_reset_pdu(sc, hdr);
2417
2418 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
2419 session->tgt_reset_timeout)) {
2420 rc = FAILED;
2421 goto unlock;
2422 }
2423
2424 switch (conn->tmf_state) {
2425 case TMF_SUCCESS:
2426 break;
2427 case TMF_TIMEDOUT:
2428 spin_unlock_bh(&session->lock);
Mike Christiedf4da5c2010-12-31 02:22:18 -06002429 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002430 goto done;
2431 default:
2432 conn->tmf_state = TMF_INITIAL;
2433 goto unlock;
2434 }
2435
2436 rc = SUCCESS;
2437 spin_unlock_bh(&session->lock);
2438
2439 iscsi_suspend_tx(conn);
2440
2441 spin_lock_bh(&session->lock);
2442 memset(hdr, 0, sizeof(*hdr));
2443 fail_scsi_tasks(conn, -1, DID_ERROR);
2444 conn->tmf_state = TMF_INITIAL;
2445 spin_unlock_bh(&session->lock);
2446
2447 iscsi_start_tx(conn);
2448 goto done;
2449
2450unlock:
2451 spin_unlock_bh(&session->lock);
2452done:
2453 ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname,
2454 rc == SUCCESS ? "SUCCESS" : "FAILED");
2455 mutex_unlock(&session->eh_mutex);
Jayamohan Kallickal309ce152010-02-20 08:02:10 +05302456 return rc;
2457}
2458EXPORT_SYMBOL_GPL(iscsi_eh_target_reset);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002459
Jayamohan Kallickal309ce152010-02-20 08:02:10 +05302460/**
2461 * iscsi_eh_recover_target - reset target and possibly the session
2462 * @sc: scsi command
2463 *
2464 * This will attempt to send a warm target reset. If that fails,
2465 * we will escalate to ERL0 session recovery.
2466 */
2467int iscsi_eh_recover_target(struct scsi_cmnd *sc)
2468{
2469 int rc;
2470
2471 rc = iscsi_eh_target_reset(sc);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002472 if (rc == FAILED)
2473 rc = iscsi_eh_session_reset(sc);
2474 return rc;
2475}
Jayamohan Kallickal309ce152010-02-20 08:02:10 +05302476EXPORT_SYMBOL_GPL(iscsi_eh_recover_target);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002477
Olaf Kirch63203772007-12-13 12:43:25 -06002478/*
2479 * Pre-allocate a pool of @max items of @item_size. By default, the pool
2480 * should be accessed via kfifo_{get,put} on q->queue.
2481 * Optionally, the caller can obtain the array of object pointers
2482 * by passing in a non-NULL @items pointer
2483 */
Mike Christie7996a772006-04-06 21:13:41 -05002484int
Olaf Kirch63203772007-12-13 12:43:25 -06002485iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
Mike Christie7996a772006-04-06 21:13:41 -05002486{
Olaf Kirch63203772007-12-13 12:43:25 -06002487 int i, num_arrays = 1;
Mike Christie7996a772006-04-06 21:13:41 -05002488
Olaf Kirch63203772007-12-13 12:43:25 -06002489 memset(q, 0, sizeof(*q));
Mike Christie7996a772006-04-06 21:13:41 -05002490
2491 q->max = max;
Olaf Kirch63203772007-12-13 12:43:25 -06002492
2493 /* If the user passed an items pointer, he wants a copy of
2494 * the array. */
2495 if (items)
2496 num_arrays++;
2497 q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL);
2498 if (q->pool == NULL)
Jean Delvaref474a372009-03-05 14:45:55 -06002499 return -ENOMEM;
Mike Christie7996a772006-04-06 21:13:41 -05002500
Stefani Seiboldc1e13f22009-12-21 14:37:27 -08002501 kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*));
Mike Christie7996a772006-04-06 21:13:41 -05002502
2503 for (i = 0; i < max; i++) {
Olaf Kirch63203772007-12-13 12:43:25 -06002504 q->pool[i] = kzalloc(item_size, GFP_KERNEL);
Mike Christie7996a772006-04-06 21:13:41 -05002505 if (q->pool[i] == NULL) {
Olaf Kirch63203772007-12-13 12:43:25 -06002506 q->max = i;
2507 goto enomem;
Mike Christie7996a772006-04-06 21:13:41 -05002508 }
Stefani Seibold7acd72e2009-12-21 14:37:28 -08002509 kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*));
Mike Christie7996a772006-04-06 21:13:41 -05002510 }
Olaf Kirch63203772007-12-13 12:43:25 -06002511
2512 if (items) {
2513 *items = q->pool + max;
2514 memcpy(*items, q->pool, max * sizeof(void *));
2515 }
2516
Mike Christie7996a772006-04-06 21:13:41 -05002517 return 0;
Olaf Kirch63203772007-12-13 12:43:25 -06002518
2519enomem:
2520 iscsi_pool_free(q);
2521 return -ENOMEM;
Mike Christie7996a772006-04-06 21:13:41 -05002522}
2523EXPORT_SYMBOL_GPL(iscsi_pool_init);
2524
Olaf Kirch63203772007-12-13 12:43:25 -06002525void iscsi_pool_free(struct iscsi_pool *q)
Mike Christie7996a772006-04-06 21:13:41 -05002526{
2527 int i;
2528
2529 for (i = 0; i < q->max; i++)
Olaf Kirch63203772007-12-13 12:43:25 -06002530 kfree(q->pool[i]);
Jean Delvaref474a372009-03-05 14:45:55 -06002531 kfree(q->pool);
Mike Christie7996a772006-04-06 21:13:41 -05002532}
2533EXPORT_SYMBOL_GPL(iscsi_pool_free);
2534
Mike Christiea4804cd2008-05-21 15:54:00 -05002535/**
2536 * iscsi_host_add - add host to system
2537 * @shost: scsi host
2538 * @pdev: parent device
2539 *
2540 * This should be called by partial offload and software iscsi drivers
2541 * to add a host to the system.
2542 */
2543int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev)
Mike Christie7996a772006-04-06 21:13:41 -05002544{
Mike Christie8e9a20c2008-06-16 10:11:33 -05002545 if (!shost->can_queue)
2546 shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX;
2547
Mike Christie4d108352009-03-05 14:46:04 -06002548 if (!shost->cmd_per_lun)
2549 shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN;
2550
Mike Christie308cec12009-02-06 12:06:20 -06002551 if (!shost->transportt->eh_timed_out)
2552 shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out;
Mike Christiea4804cd2008-05-21 15:54:00 -05002553 return scsi_add_host(shost, pdev);
2554}
2555EXPORT_SYMBOL_GPL(iscsi_host_add);
2556
2557/**
2558 * iscsi_host_alloc - allocate a host and driver data
2559 * @sht: scsi host template
2560 * @dd_data_size: driver host data size
Mike Christie32ae7632009-03-05 14:46:03 -06002561 * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue
Mike Christiea4804cd2008-05-21 15:54:00 -05002562 *
2563 * This should be called by partial offload and software iscsi drivers.
2564 * To access the driver specific memory use the iscsi_host_priv() macro.
2565 */
2566struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
Mike Christie4d108352009-03-05 14:46:04 -06002567 int dd_data_size, bool xmit_can_sleep)
Mike Christiea4804cd2008-05-21 15:54:00 -05002568{
2569 struct Scsi_Host *shost;
Mike Christiee5bd7b52008-09-24 11:46:10 -05002570 struct iscsi_host *ihost;
Mike Christiea4804cd2008-05-21 15:54:00 -05002571
2572 shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size);
2573 if (!shost)
2574 return NULL;
Mike Christiee5bd7b52008-09-24 11:46:10 -05002575 ihost = shost_priv(shost);
Mike Christie32ae7632009-03-05 14:46:03 -06002576
2577 if (xmit_can_sleep) {
2578 snprintf(ihost->workq_name, sizeof(ihost->workq_name),
2579 "iscsi_q_%d", shost->host_no);
2580 ihost->workq = create_singlethread_workqueue(ihost->workq_name);
2581 if (!ihost->workq)
2582 goto free_host;
2583 }
2584
Mike Christiee5bd7b52008-09-24 11:46:10 -05002585 spin_lock_init(&ihost->lock);
2586 ihost->state = ISCSI_HOST_SETUP;
2587 ihost->num_sessions = 0;
2588 init_waitqueue_head(&ihost->session_removal_wq);
Mike Christiea4804cd2008-05-21 15:54:00 -05002589 return shost;
Mike Christie32ae7632009-03-05 14:46:03 -06002590
2591free_host:
2592 scsi_host_put(shost);
2593 return NULL;
Mike Christie75613522008-05-21 15:53:59 -05002594}
Mike Christiea4804cd2008-05-21 15:54:00 -05002595EXPORT_SYMBOL_GPL(iscsi_host_alloc);
Mike Christie75613522008-05-21 15:53:59 -05002596
Mike Christiee5bd7b52008-09-24 11:46:10 -05002597static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session)
2598{
Mike Christie40a06e72009-03-05 14:46:05 -06002599 iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST);
Mike Christiee5bd7b52008-09-24 11:46:10 -05002600}
2601
Mike Christiea4804cd2008-05-21 15:54:00 -05002602/**
2603 * iscsi_host_remove - remove host and sessions
2604 * @shost: scsi host
2605 *
Mike Christiee5bd7b52008-09-24 11:46:10 -05002606 * If there are any sessions left, this will initiate the removal and wait
2607 * for the completion.
Mike Christiea4804cd2008-05-21 15:54:00 -05002608 */
2609void iscsi_host_remove(struct Scsi_Host *shost)
2610{
Mike Christiee5bd7b52008-09-24 11:46:10 -05002611 struct iscsi_host *ihost = shost_priv(shost);
2612 unsigned long flags;
2613
2614 spin_lock_irqsave(&ihost->lock, flags);
2615 ihost->state = ISCSI_HOST_REMOVED;
2616 spin_unlock_irqrestore(&ihost->lock, flags);
2617
2618 iscsi_host_for_each_session(shost, iscsi_notify_host_removed);
2619 wait_event_interruptible(ihost->session_removal_wq,
2620 ihost->num_sessions == 0);
2621 if (signal_pending(current))
2622 flush_signals(current);
2623
Mike Christiea4804cd2008-05-21 15:54:00 -05002624 scsi_remove_host(shost);
Mike Christie32ae7632009-03-05 14:46:03 -06002625 if (ihost->workq)
2626 destroy_workqueue(ihost->workq);
Mike Christiea4804cd2008-05-21 15:54:00 -05002627}
2628EXPORT_SYMBOL_GPL(iscsi_host_remove);
2629
2630void iscsi_host_free(struct Scsi_Host *shost)
Mike Christie75613522008-05-21 15:53:59 -05002631{
2632 struct iscsi_host *ihost = shost_priv(shost);
2633
2634 kfree(ihost->netdev);
2635 kfree(ihost->hwaddress);
2636 kfree(ihost->initiatorname);
Mike Christiea4804cd2008-05-21 15:54:00 -05002637 scsi_host_put(shost);
Mike Christie75613522008-05-21 15:53:59 -05002638}
Mike Christiea4804cd2008-05-21 15:54:00 -05002639EXPORT_SYMBOL_GPL(iscsi_host_free);
Mike Christie75613522008-05-21 15:53:59 -05002640
Mike Christiee5bd7b52008-09-24 11:46:10 -05002641static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost)
2642{
2643 struct iscsi_host *ihost = shost_priv(shost);
2644 unsigned long flags;
2645
2646 shost = scsi_host_get(shost);
2647 if (!shost) {
2648 printk(KERN_ERR "Invalid state. Cannot notify host removal "
2649 "of session teardown event because host already "
2650 "removed.\n");
2651 return;
2652 }
2653
2654 spin_lock_irqsave(&ihost->lock, flags);
2655 ihost->num_sessions--;
2656 if (ihost->num_sessions == 0)
2657 wake_up(&ihost->session_removal_wq);
2658 spin_unlock_irqrestore(&ihost->lock, flags);
2659 scsi_host_put(shost);
2660}
2661
Mike Christie75613522008-05-21 15:53:59 -05002662/**
2663 * iscsi_session_setup - create iscsi cls session and host and session
2664 * @iscsit: iscsi transport template
2665 * @shost: scsi host
2666 * @cmds_max: session can queue
Mike Christie9c19a7d2008-05-21 15:54:09 -05002667 * @cmd_task_size: LLD task private data size
Mike Christie75613522008-05-21 15:53:59 -05002668 * @initial_cmdsn: initial CmdSN
2669 *
2670 * This can be used by software iscsi_transports that allocate
2671 * a session per scsi host.
Mike Christie3cf7b232008-05-21 15:54:17 -05002672 *
2673 * Callers should set cmds_max to the largest total numer (mgmt + scsi) of
2674 * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks
2675 * for nop handling and login/logout requests.
Mike Christie75613522008-05-21 15:53:59 -05002676 */
2677struct iscsi_cls_session *
2678iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
Jayamohan Kallickalb8b9e1b82009-09-22 08:21:22 +05302679 uint16_t cmds_max, int dd_size, int cmd_task_size,
Mike Christie79706342008-05-21 15:54:12 -05002680 uint32_t initial_cmdsn, unsigned int id)
Mike Christie75613522008-05-21 15:53:59 -05002681{
Mike Christiee5bd7b52008-09-24 11:46:10 -05002682 struct iscsi_host *ihost = shost_priv(shost);
Mike Christie75613522008-05-21 15:53:59 -05002683 struct iscsi_session *session;
2684 struct iscsi_cls_session *cls_session;
Mike Christie3cf7b232008-05-21 15:54:17 -05002685 int cmd_i, scsi_cmds, total_cmds = cmds_max;
Mike Christiee5bd7b52008-09-24 11:46:10 -05002686 unsigned long flags;
2687
2688 spin_lock_irqsave(&ihost->lock, flags);
2689 if (ihost->state == ISCSI_HOST_REMOVED) {
2690 spin_unlock_irqrestore(&ihost->lock, flags);
2691 return NULL;
2692 }
2693 ihost->num_sessions++;
2694 spin_unlock_irqrestore(&ihost->lock, flags);
Mike Christie8e9a20c2008-06-16 10:11:33 -05002695
2696 if (!total_cmds)
2697 total_cmds = ISCSI_DEF_XMIT_CMDS_MAX;
Mike Christie3e5c28a2008-05-21 15:54:06 -05002698 /*
Mike Christie3cf7b232008-05-21 15:54:17 -05002699 * The iscsi layer needs some tasks for nop handling and tmfs,
2700 * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX
2701 * + 1 command for scsi IO.
Mike Christie3e5c28a2008-05-21 15:54:06 -05002702 */
Mike Christie3cf7b232008-05-21 15:54:17 -05002703 if (total_cmds < ISCSI_TOTAL_CMDS_MIN) {
2704 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2705 "must be a power of two that is at least %d.\n",
2706 total_cmds, ISCSI_TOTAL_CMDS_MIN);
Mike Christiee5bd7b52008-09-24 11:46:10 -05002707 goto dec_session_count;
Mike Christie15482712007-05-30 12:57:19 -05002708 }
Mike Christie3cf7b232008-05-21 15:54:17 -05002709
2710 if (total_cmds > ISCSI_TOTAL_CMDS_MAX) {
2711 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2712 "must be a power of 2 less than or equal to %d.\n",
2713 cmds_max, ISCSI_TOTAL_CMDS_MAX);
2714 total_cmds = ISCSI_TOTAL_CMDS_MAX;
2715 }
2716
2717 if (!is_power_of_2(total_cmds)) {
2718 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2719 "must be a power of 2.\n", total_cmds);
2720 total_cmds = rounddown_pow_of_two(total_cmds);
2721 if (total_cmds < ISCSI_TOTAL_CMDS_MIN)
2722 return NULL;
2723 printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n",
2724 total_cmds);
2725 }
2726 scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX;
Mike Christie15482712007-05-30 12:57:19 -05002727
Mike Christie5d91e202008-05-21 15:54:01 -05002728 cls_session = iscsi_alloc_session(shost, iscsit,
Jayamohan Kallickalb8b9e1b82009-09-22 08:21:22 +05302729 sizeof(struct iscsi_session) +
2730 dd_size);
Mike Christie75613522008-05-21 15:53:59 -05002731 if (!cls_session)
Mike Christiee5bd7b52008-09-24 11:46:10 -05002732 goto dec_session_count;
Mike Christie75613522008-05-21 15:53:59 -05002733 session = cls_session->dd_data;
2734 session->cls_session = cls_session;
Mike Christie7996a772006-04-06 21:13:41 -05002735 session->host = shost;
2736 session->state = ISCSI_STATE_FREE;
Mike Christief6d51802007-12-13 12:43:30 -06002737 session->fast_abort = 1;
Mike Christie3fe5ae82009-11-11 16:34:33 -06002738 session->tgt_reset_timeout = 30;
Mike Christie4cd49ea2007-12-13 12:43:38 -06002739 session->lu_reset_timeout = 15;
2740 session->abort_timeout = 10;
Mike Christie3cf7b232008-05-21 15:54:17 -05002741 session->scsi_cmds_max = scsi_cmds;
2742 session->cmds_max = total_cmds;
Mike Christiee0726402007-07-26 12:46:48 -05002743 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
Mike Christie7996a772006-04-06 21:13:41 -05002744 session->exp_cmdsn = initial_cmdsn + 1;
2745 session->max_cmdsn = initial_cmdsn + 1;
2746 session->max_r2t = 1;
2747 session->tt = iscsit;
Jayamohan Kallickalb8b9e1b82009-09-22 08:21:22 +05302748 session->dd_data = cls_session->dd_data + sizeof(*session);
Mike Christie6724add2007-08-15 01:38:30 -05002749 mutex_init(&session->eh_mutex);
Mike Christie75613522008-05-21 15:53:59 -05002750 spin_lock_init(&session->lock);
Mike Christie7996a772006-04-06 21:13:41 -05002751
2752 /* initialize SCSI PDU commands pool */
2753 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
2754 (void***)&session->cmds,
Mike Christie9c19a7d2008-05-21 15:54:09 -05002755 cmd_task_size + sizeof(struct iscsi_task)))
Mike Christie7996a772006-04-06 21:13:41 -05002756 goto cmdpool_alloc_fail;
2757
2758 /* pre-format cmds pool with ITT */
2759 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
Mike Christie9c19a7d2008-05-21 15:54:09 -05002760 struct iscsi_task *task = session->cmds[cmd_i];
Mike Christie7996a772006-04-06 21:13:41 -05002761
Mike Christie9c19a7d2008-05-21 15:54:09 -05002762 if (cmd_task_size)
2763 task->dd_data = &task[1];
2764 task->itt = cmd_i;
Mike Christie3bbaaad2009-05-13 17:57:46 -05002765 task->state = ISCSI_TASK_FREE;
Mike Christie9c19a7d2008-05-21 15:54:09 -05002766 INIT_LIST_HEAD(&task->running);
Mike Christie7996a772006-04-06 21:13:41 -05002767 }
2768
Mike Christief53a88d2006-06-28 12:00:27 -05002769 if (!try_module_get(iscsit->owner))
Mike Christie75613522008-05-21 15:53:59 -05002770 goto module_get_fail;
2771
Mike Christie79706342008-05-21 15:54:12 -05002772 if (iscsi_add_session(cls_session, id))
Mike Christief53a88d2006-06-28 12:00:27 -05002773 goto cls_session_fail;
Mike Christiee5bd7b52008-09-24 11:46:10 -05002774
Mike Christie7996a772006-04-06 21:13:41 -05002775 return cls_session;
2776
2777cls_session_fail:
Mike Christie75613522008-05-21 15:53:59 -05002778 module_put(iscsit->owner);
2779module_get_fail:
Olaf Kirch63203772007-12-13 12:43:25 -06002780 iscsi_pool_free(&session->cmdpool);
Mike Christie7996a772006-04-06 21:13:41 -05002781cmdpool_alloc_fail:
Mike Christie75613522008-05-21 15:53:59 -05002782 iscsi_free_session(cls_session);
Mike Christiee5bd7b52008-09-24 11:46:10 -05002783dec_session_count:
2784 iscsi_host_dec_session_cnt(shost);
Mike Christie7996a772006-04-06 21:13:41 -05002785 return NULL;
2786}
2787EXPORT_SYMBOL_GPL(iscsi_session_setup);
2788
2789/**
2790 * iscsi_session_teardown - destroy session, host, and cls_session
Mike Christie75613522008-05-21 15:53:59 -05002791 * @cls_session: iscsi session
Mike Christie7996a772006-04-06 21:13:41 -05002792 *
Mike Christie75613522008-05-21 15:53:59 -05002793 * The driver must have called iscsi_remove_session before
2794 * calling this.
2795 */
Mike Christie7996a772006-04-06 21:13:41 -05002796void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
2797{
Mike Christie75613522008-05-21 15:53:59 -05002798 struct iscsi_session *session = cls_session->dd_data;
Mike Christie63f75cc2006-07-24 15:47:29 -05002799 struct module *owner = cls_session->transport->owner;
Mike Christiee5bd7b52008-09-24 11:46:10 -05002800 struct Scsi_Host *shost = session->host;
Mike Christie7996a772006-04-06 21:13:41 -05002801
Olaf Kirch63203772007-12-13 12:43:25 -06002802 iscsi_pool_free(&session->cmdpool);
Mike Christie7996a772006-04-06 21:13:41 -05002803
Mike Christieb2c64162007-05-30 12:57:16 -05002804 kfree(session->password);
2805 kfree(session->password_in);
2806 kfree(session->username);
2807 kfree(session->username_in);
Mike Christief3ff0c32006-07-24 15:47:50 -05002808 kfree(session->targetname);
Vikas Chaudhary3c5c4802012-01-19 03:06:53 -08002809 kfree(session->targetalias);
Mike Christie88dfd342008-05-21 15:54:16 -05002810 kfree(session->initiatorname);
Eddie Wai3b9373e2013-06-20 10:21:26 -07002811 kfree(session->boot_root);
2812 kfree(session->boot_nic);
2813 kfree(session->boot_target);
Mike Christie88dfd342008-05-21 15:54:16 -05002814 kfree(session->ifacename);
Mike Christief3ff0c32006-07-24 15:47:50 -05002815
Mike Christie75613522008-05-21 15:53:59 -05002816 iscsi_destroy_session(cls_session);
Mike Christiee5bd7b52008-09-24 11:46:10 -05002817 iscsi_host_dec_session_cnt(shost);
Mike Christie63f75cc2006-07-24 15:47:29 -05002818 module_put(owner);
Mike Christie7996a772006-04-06 21:13:41 -05002819}
2820EXPORT_SYMBOL_GPL(iscsi_session_teardown);
2821
2822/**
2823 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
2824 * @cls_session: iscsi_cls_session
Mike Christie5d91e202008-05-21 15:54:01 -05002825 * @dd_size: private driver data size
Mike Christie7996a772006-04-06 21:13:41 -05002826 * @conn_idx: cid
Mike Christie5d91e202008-05-21 15:54:01 -05002827 */
Mike Christie7996a772006-04-06 21:13:41 -05002828struct iscsi_cls_conn *
Mike Christie5d91e202008-05-21 15:54:01 -05002829iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size,
2830 uint32_t conn_idx)
Mike Christie7996a772006-04-06 21:13:41 -05002831{
Mike Christie75613522008-05-21 15:53:59 -05002832 struct iscsi_session *session = cls_session->dd_data;
Mike Christie7996a772006-04-06 21:13:41 -05002833 struct iscsi_conn *conn;
2834 struct iscsi_cls_conn *cls_conn;
Mike Christied36ab6f2006-05-18 20:31:34 -05002835 char *data;
Mike Christie7996a772006-04-06 21:13:41 -05002836
Mike Christie5d91e202008-05-21 15:54:01 -05002837 cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size,
2838 conn_idx);
Mike Christie7996a772006-04-06 21:13:41 -05002839 if (!cls_conn)
2840 return NULL;
2841 conn = cls_conn->dd_data;
Mike Christie5d91e202008-05-21 15:54:01 -05002842 memset(conn, 0, sizeof(*conn) + dd_size);
Mike Christie7996a772006-04-06 21:13:41 -05002843
Mike Christie5d91e202008-05-21 15:54:01 -05002844 conn->dd_data = cls_conn->dd_data + sizeof(*conn);
Mike Christie7996a772006-04-06 21:13:41 -05002845 conn->session = session;
2846 conn->cls_conn = cls_conn;
2847 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
2848 conn->id = conn_idx;
2849 conn->exp_statsn = 0;
Mike Christie843c0a82007-12-13 12:43:20 -06002850 conn->tmf_state = TMF_INITIAL;
Mike Christief6d51802007-12-13 12:43:30 -06002851
2852 init_timer(&conn->transport_timer);
2853 conn->transport_timer.data = (unsigned long)conn;
2854 conn->transport_timer.function = iscsi_check_transport_timeouts;
2855
Mike Christie843c0a82007-12-13 12:43:20 -06002856 INIT_LIST_HEAD(&conn->mgmtqueue);
Mike Christie3bbaaad2009-05-13 17:57:46 -05002857 INIT_LIST_HEAD(&conn->cmdqueue);
Mike Christie843c0a82007-12-13 12:43:20 -06002858 INIT_LIST_HEAD(&conn->requeue);
David Howellsc4028952006-11-22 14:57:56 +00002859 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
Mike Christie7996a772006-04-06 21:13:41 -05002860
Mike Christie9c19a7d2008-05-21 15:54:09 -05002861 /* allocate login_task used for the login/text sequences */
Mike Christie7996a772006-04-06 21:13:41 -05002862 spin_lock_bh(&session->lock);
Stefani Seibold7acd72e2009-12-21 14:37:28 -08002863 if (!kfifo_out(&session->cmdpool.queue,
Mike Christie9c19a7d2008-05-21 15:54:09 -05002864 (void*)&conn->login_task,
Mike Christie7996a772006-04-06 21:13:41 -05002865 sizeof(void*))) {
2866 spin_unlock_bh(&session->lock);
Mike Christie9c19a7d2008-05-21 15:54:09 -05002867 goto login_task_alloc_fail;
Mike Christie7996a772006-04-06 21:13:41 -05002868 }
2869 spin_unlock_bh(&session->lock);
2870
Mike Christiecfeb2cf2008-12-02 00:32:09 -06002871 data = (char *) __get_free_pages(GFP_KERNEL,
2872 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
Mike Christied36ab6f2006-05-18 20:31:34 -05002873 if (!data)
Mike Christie9c19a7d2008-05-21 15:54:09 -05002874 goto login_task_data_alloc_fail;
2875 conn->login_task->data = conn->data = data;
Mike Christied36ab6f2006-05-18 20:31:34 -05002876
Mike Christie843c0a82007-12-13 12:43:20 -06002877 init_timer(&conn->tmf_timer);
Mike Christie7996a772006-04-06 21:13:41 -05002878 init_waitqueue_head(&conn->ehwait);
2879
2880 return cls_conn;
2881
Mike Christie9c19a7d2008-05-21 15:54:09 -05002882login_task_data_alloc_fail:
Stefani Seibold7acd72e2009-12-21 14:37:28 -08002883 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
Mike Christied36ab6f2006-05-18 20:31:34 -05002884 sizeof(void*));
Mike Christie9c19a7d2008-05-21 15:54:09 -05002885login_task_alloc_fail:
Mike Christie7996a772006-04-06 21:13:41 -05002886 iscsi_destroy_conn(cls_conn);
2887 return NULL;
2888}
2889EXPORT_SYMBOL_GPL(iscsi_conn_setup);
2890
2891/**
2892 * iscsi_conn_teardown - teardown iscsi connection
2893 * cls_conn: iscsi class connection
2894 *
2895 * TODO: we may need to make this into a two step process
2896 * like scsi-mls remove + put host
2897 */
2898void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
2899{
2900 struct iscsi_conn *conn = cls_conn->dd_data;
2901 struct iscsi_session *session = conn->session;
2902 unsigned long flags;
2903
Mike Christief6d51802007-12-13 12:43:30 -06002904 del_timer_sync(&conn->transport_timer);
2905
Mike Christie7996a772006-04-06 21:13:41 -05002906 spin_lock_bh(&session->lock);
2907 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
2908 if (session->leadconn == conn) {
2909 /*
2910 * leading connection? then give up on recovery.
2911 */
2912 session->state = ISCSI_STATE_TERMINATE;
2913 wake_up(&conn->ehwait);
2914 }
2915 spin_unlock_bh(&session->lock);
2916
Mike Christie7996a772006-04-06 21:13:41 -05002917 /*
2918 * Block until all in-progress commands for this connection
2919 * time out or fail.
2920 */
2921 for (;;) {
2922 spin_lock_irqsave(session->host->host_lock, flags);
2923 if (!session->host->host_busy) { /* OK for ERL == 0 */
2924 spin_unlock_irqrestore(session->host->host_lock, flags);
2925 break;
2926 }
2927 spin_unlock_irqrestore(session->host->host_lock, flags);
2928 msleep_interruptible(500);
Mike Christie322d7392008-01-31 13:36:52 -06002929 iscsi_conn_printk(KERN_INFO, conn, "iscsi conn_destroy(): "
2930 "host_busy %d host_failed %d\n",
2931 session->host->host_busy,
2932 session->host->host_failed);
Mike Christie7996a772006-04-06 21:13:41 -05002933 /*
2934 * force eh_abort() to unblock
2935 */
2936 wake_up(&conn->ehwait);
2937 }
2938
Mike Christie779ea122007-02-28 17:32:15 -06002939 /* flush queued up work because we free the connection below */
Mike Christie843c0a82007-12-13 12:43:20 -06002940 iscsi_suspend_tx(conn);
Mike Christie779ea122007-02-28 17:32:15 -06002941
Mike Christie7996a772006-04-06 21:13:41 -05002942 spin_lock_bh(&session->lock);
Mike Christiecfeb2cf2008-12-02 00:32:09 -06002943 free_pages((unsigned long) conn->data,
2944 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
Mike Christief3ff0c32006-07-24 15:47:50 -05002945 kfree(conn->persistent_address);
Stefani Seibold7acd72e2009-12-21 14:37:28 -08002946 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
Mike Christie7996a772006-04-06 21:13:41 -05002947 sizeof(void*));
Mike Christiee0726402007-07-26 12:46:48 -05002948 if (session->leadconn == conn)
Mike Christie7996a772006-04-06 21:13:41 -05002949 session->leadconn = NULL;
Mike Christie7996a772006-04-06 21:13:41 -05002950 spin_unlock_bh(&session->lock);
2951
Mike Christie7996a772006-04-06 21:13:41 -05002952 iscsi_destroy_conn(cls_conn);
2953}
2954EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
2955
2956int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
2957{
2958 struct iscsi_conn *conn = cls_conn->dd_data;
2959 struct iscsi_session *session = conn->session;
2960
Mike Christieffd04362006-08-31 18:09:24 -04002961 if (!session) {
Mike Christie322d7392008-01-31 13:36:52 -06002962 iscsi_conn_printk(KERN_ERR, conn,
2963 "can't start unbound connection\n");
Mike Christie7996a772006-04-06 21:13:41 -05002964 return -EPERM;
2965 }
2966
Mike Christiedb98ccd2006-08-31 18:09:31 -04002967 if ((session->imm_data_en || !session->initial_r2t_en) &&
2968 session->first_burst > session->max_burst) {
Mike Christie322d7392008-01-31 13:36:52 -06002969 iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: "
2970 "first_burst %d max_burst %d\n",
2971 session->first_burst, session->max_burst);
Mike Christieffd04362006-08-31 18:09:24 -04002972 return -EINVAL;
2973 }
2974
Mike Christief6d51802007-12-13 12:43:30 -06002975 if (conn->ping_timeout && !conn->recv_timeout) {
Mike Christie322d7392008-01-31 13:36:52 -06002976 iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of "
2977 "zero. Using 5 seconds\n.");
Mike Christief6d51802007-12-13 12:43:30 -06002978 conn->recv_timeout = 5;
2979 }
2980
2981 if (conn->recv_timeout && !conn->ping_timeout) {
Mike Christie322d7392008-01-31 13:36:52 -06002982 iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of "
2983 "zero. Using 5 seconds.\n");
Mike Christief6d51802007-12-13 12:43:30 -06002984 conn->ping_timeout = 5;
2985 }
2986
Mike Christie7996a772006-04-06 21:13:41 -05002987 spin_lock_bh(&session->lock);
2988 conn->c_stage = ISCSI_CONN_STARTED;
2989 session->state = ISCSI_STATE_LOGGED_IN;
Mike Christiee0726402007-07-26 12:46:48 -05002990 session->queued_cmdsn = session->cmdsn;
Mike Christie7996a772006-04-06 21:13:41 -05002991
Mike Christief6d51802007-12-13 12:43:30 -06002992 conn->last_recv = jiffies;
2993 conn->last_ping = jiffies;
2994 if (conn->recv_timeout && conn->ping_timeout)
2995 mod_timer(&conn->transport_timer,
2996 jiffies + (conn->recv_timeout * HZ));
2997
Mike Christie7996a772006-04-06 21:13:41 -05002998 switch(conn->stop_stage) {
2999 case STOP_CONN_RECOVER:
3000 /*
3001 * unblock eh_abort() if it is blocked. re-try all
3002 * commands after successful recovery
3003 */
Mike Christie7996a772006-04-06 21:13:41 -05003004 conn->stop_stage = 0;
Mike Christie843c0a82007-12-13 12:43:20 -06003005 conn->tmf_state = TMF_INITIAL;
Mike Christie7996a772006-04-06 21:13:41 -05003006 session->age++;
Mike Christie8b1d0342008-01-31 13:36:53 -06003007 if (session->age == 16)
3008 session->age = 0;
Mike Christie6eabafb2008-01-31 13:36:43 -06003009 break;
Mike Christie7996a772006-04-06 21:13:41 -05003010 case STOP_CONN_TERM:
Mike Christie7996a772006-04-06 21:13:41 -05003011 conn->stop_stage = 0;
3012 break;
Mike Christie7996a772006-04-06 21:13:41 -05003013 default:
3014 break;
3015 }
3016 spin_unlock_bh(&session->lock);
3017
Mike Christie75613522008-05-21 15:53:59 -05003018 iscsi_unblock_session(session->cls_session);
Mike Christie6eabafb2008-01-31 13:36:43 -06003019 wake_up(&conn->ehwait);
Mike Christie7996a772006-04-06 21:13:41 -05003020 return 0;
3021}
3022EXPORT_SYMBOL_GPL(iscsi_conn_start);
3023
3024static void
Mike Christie3bbaaad2009-05-13 17:57:46 -05003025fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn)
Mike Christie7996a772006-04-06 21:13:41 -05003026{
Mike Christie3bbaaad2009-05-13 17:57:46 -05003027 struct iscsi_task *task;
Mike Christieb3cd5052009-05-13 17:57:49 -05003028 int i, state;
Mike Christie7996a772006-04-06 21:13:41 -05003029
Mike Christie3bbaaad2009-05-13 17:57:46 -05003030 for (i = 0; i < conn->session->cmds_max; i++) {
3031 task = conn->session->cmds[i];
3032 if (task->sc)
3033 continue;
3034
3035 if (task->state == ISCSI_TASK_FREE)
3036 continue;
3037
3038 ISCSI_DBG_SESSION(conn->session,
3039 "failing mgmt itt 0x%x state %d\n",
3040 task->itt, task->state);
Mike Christieb3cd5052009-05-13 17:57:49 -05003041 state = ISCSI_TASK_ABRT_SESS_RECOV;
3042 if (task->state == ISCSI_TASK_PENDING)
3043 state = ISCSI_TASK_COMPLETED;
3044 iscsi_complete_task(task, state);
3045
Mike Christie7996a772006-04-06 21:13:41 -05003046 }
Mike Christie7996a772006-04-06 21:13:41 -05003047}
3048
Mike Christie656cffc2006-05-18 20:31:42 -05003049static void iscsi_start_session_recovery(struct iscsi_session *session,
3050 struct iscsi_conn *conn, int flag)
Mike Christie7996a772006-04-06 21:13:41 -05003051{
Mike Christieed2abc72006-05-02 19:46:40 -05003052 int old_stop_stage;
3053
Mike Christie6724add2007-08-15 01:38:30 -05003054 mutex_lock(&session->eh_mutex);
Mike Christie7996a772006-04-06 21:13:41 -05003055 spin_lock_bh(&session->lock);
Mike Christieed2abc72006-05-02 19:46:40 -05003056 if (conn->stop_stage == STOP_CONN_TERM) {
Mike Christie7996a772006-04-06 21:13:41 -05003057 spin_unlock_bh(&session->lock);
Mike Christie6724add2007-08-15 01:38:30 -05003058 mutex_unlock(&session->eh_mutex);
3059 return;
3060 }
3061
3062 /*
Mike Christieed2abc72006-05-02 19:46:40 -05003063 * When this is called for the in_login state, we only want to clean
Mike Christie9c19a7d2008-05-21 15:54:09 -05003064 * up the login task and connection. We do not need to block and set
Mike Christie67a61112006-05-30 00:37:20 -05003065 * the recovery state again
Mike Christieed2abc72006-05-02 19:46:40 -05003066 */
Mike Christie67a61112006-05-30 00:37:20 -05003067 if (flag == STOP_CONN_TERM)
3068 session->state = ISCSI_STATE_TERMINATE;
3069 else if (conn->stop_stage != STOP_CONN_RECOVER)
3070 session->state = ISCSI_STATE_IN_RECOVERY;
Mike Christie4ae0a6c2010-03-09 14:14:51 -06003071
3072 old_stop_stage = conn->stop_stage;
3073 conn->stop_stage = flag;
Mike Christie26013ad2009-05-13 17:57:43 -05003074 spin_unlock_bh(&session->lock);
Mike Christieed2abc72006-05-02 19:46:40 -05003075
Mike Christie26013ad2009-05-13 17:57:43 -05003076 del_timer_sync(&conn->transport_timer);
3077 iscsi_suspend_tx(conn);
3078
3079 spin_lock_bh(&session->lock);
Mike Christie67a61112006-05-30 00:37:20 -05003080 conn->c_stage = ISCSI_CONN_STOPPED;
Mike Christie7996a772006-04-06 21:13:41 -05003081 spin_unlock_bh(&session->lock);
Mike Christie6724add2007-08-15 01:38:30 -05003082
Mike Christie7996a772006-04-06 21:13:41 -05003083 /*
3084 * for connection level recovery we should not calculate
3085 * header digest. conn->hdr_size used for optimization
3086 * in hdr_extract() and will be re-negotiated at
3087 * set_param() time.
3088 */
3089 if (flag == STOP_CONN_RECOVER) {
3090 conn->hdrdgst_en = 0;
3091 conn->datadgst_en = 0;
Mike Christie656cffc2006-05-18 20:31:42 -05003092 if (session->state == ISCSI_STATE_IN_RECOVERY &&
Mike Christie67a61112006-05-30 00:37:20 -05003093 old_stop_stage != STOP_CONN_RECOVER) {
Mike Christie1b2c7af2009-03-05 14:45:58 -06003094 ISCSI_DBG_SESSION(session, "blocking session\n");
Mike Christie75613522008-05-21 15:53:59 -05003095 iscsi_block_session(session->cls_session);
Mike Christie67a61112006-05-30 00:37:20 -05003096 }
Mike Christie7996a772006-04-06 21:13:41 -05003097 }
Mike Christie656cffc2006-05-18 20:31:42 -05003098
Mike Christie656cffc2006-05-18 20:31:42 -05003099 /*
3100 * flush queues.
3101 */
3102 spin_lock_bh(&session->lock);
Mike Christieb3cd5052009-05-13 17:57:49 -05003103 fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED);
Mike Christie3bbaaad2009-05-13 17:57:46 -05003104 fail_mgmt_tasks(session, conn);
Mike Christie5d12c052009-11-11 16:34:32 -06003105 memset(&conn->tmhdr, 0, sizeof(conn->tmhdr));
Mike Christie656cffc2006-05-18 20:31:42 -05003106 spin_unlock_bh(&session->lock);
Mike Christie6724add2007-08-15 01:38:30 -05003107 mutex_unlock(&session->eh_mutex);
Mike Christie7996a772006-04-06 21:13:41 -05003108}
Mike Christie7996a772006-04-06 21:13:41 -05003109
3110void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
3111{
3112 struct iscsi_conn *conn = cls_conn->dd_data;
3113 struct iscsi_session *session = conn->session;
3114
3115 switch (flag) {
3116 case STOP_CONN_RECOVER:
3117 case STOP_CONN_TERM:
3118 iscsi_start_session_recovery(session, conn, flag);
Mike Christie8d2860b2006-05-02 19:46:47 -05003119 break;
Mike Christie7996a772006-04-06 21:13:41 -05003120 default:
Mike Christie322d7392008-01-31 13:36:52 -06003121 iscsi_conn_printk(KERN_ERR, conn,
3122 "invalid stop flag %d\n", flag);
Mike Christie7996a772006-04-06 21:13:41 -05003123 }
3124}
3125EXPORT_SYMBOL_GPL(iscsi_conn_stop);
3126
3127int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
3128 struct iscsi_cls_conn *cls_conn, int is_leading)
3129{
Mike Christie75613522008-05-21 15:53:59 -05003130 struct iscsi_session *session = cls_session->dd_data;
Mike Christie98644042006-10-16 18:09:39 -04003131 struct iscsi_conn *conn = cls_conn->dd_data;
Mike Christie7996a772006-04-06 21:13:41 -05003132
Mike Christie7996a772006-04-06 21:13:41 -05003133 spin_lock_bh(&session->lock);
Mike Christie7996a772006-04-06 21:13:41 -05003134 if (is_leading)
3135 session->leadconn = conn;
Mike Christie98644042006-10-16 18:09:39 -04003136 spin_unlock_bh(&session->lock);
Mike Christie7996a772006-04-06 21:13:41 -05003137
3138 /*
3139 * Unblock xmitworker(), Login Phase will pass through.
3140 */
3141 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
3142 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
3143 return 0;
3144}
3145EXPORT_SYMBOL_GPL(iscsi_conn_bind);
3146
Adheer Chandravanshiadaf6992013-03-22 07:41:30 -04003147int iscsi_switch_str_param(char **param, char *new_val_buf)
Mike Christie5700b1a2009-05-13 17:57:40 -05003148{
3149 char *new_val;
3150
3151 if (*param) {
3152 if (!strcmp(*param, new_val_buf))
3153 return 0;
3154 }
3155
3156 new_val = kstrdup(new_val_buf, GFP_NOIO);
3157 if (!new_val)
3158 return -ENOMEM;
3159
3160 kfree(*param);
3161 *param = new_val;
3162 return 0;
3163}
Adheer Chandravanshiadaf6992013-03-22 07:41:30 -04003164EXPORT_SYMBOL_GPL(iscsi_switch_str_param);
Mike Christiea54a52c2006-06-28 12:00:23 -05003165
3166int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
3167 enum iscsi_param param, char *buf, int buflen)
3168{
3169 struct iscsi_conn *conn = cls_conn->dd_data;
3170 struct iscsi_session *session = conn->session;
Mike Christiea54a52c2006-06-28 12:00:23 -05003171
3172 switch(param) {
Mike Christie843c0a82007-12-13 12:43:20 -06003173 case ISCSI_PARAM_FAST_ABORT:
3174 sscanf(buf, "%d", &session->fast_abort);
3175 break;
Mike Christief6d51802007-12-13 12:43:30 -06003176 case ISCSI_PARAM_ABORT_TMO:
3177 sscanf(buf, "%d", &session->abort_timeout);
3178 break;
3179 case ISCSI_PARAM_LU_RESET_TMO:
3180 sscanf(buf, "%d", &session->lu_reset_timeout);
3181 break;
Mike Christie3fe5ae82009-11-11 16:34:33 -06003182 case ISCSI_PARAM_TGT_RESET_TMO:
3183 sscanf(buf, "%d", &session->tgt_reset_timeout);
3184 break;
Mike Christief6d51802007-12-13 12:43:30 -06003185 case ISCSI_PARAM_PING_TMO:
3186 sscanf(buf, "%d", &conn->ping_timeout);
3187 break;
3188 case ISCSI_PARAM_RECV_TMO:
3189 sscanf(buf, "%d", &conn->recv_timeout);
3190 break;
Mike Christiea54a52c2006-06-28 12:00:23 -05003191 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3192 sscanf(buf, "%d", &conn->max_recv_dlength);
3193 break;
3194 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3195 sscanf(buf, "%d", &conn->max_xmit_dlength);
3196 break;
3197 case ISCSI_PARAM_HDRDGST_EN:
3198 sscanf(buf, "%d", &conn->hdrdgst_en);
3199 break;
3200 case ISCSI_PARAM_DATADGST_EN:
3201 sscanf(buf, "%d", &conn->datadgst_en);
3202 break;
3203 case ISCSI_PARAM_INITIAL_R2T_EN:
3204 sscanf(buf, "%d", &session->initial_r2t_en);
3205 break;
3206 case ISCSI_PARAM_MAX_R2T:
Mike Christie1304be52012-01-26 21:13:10 -06003207 sscanf(buf, "%hu", &session->max_r2t);
Mike Christiea54a52c2006-06-28 12:00:23 -05003208 break;
3209 case ISCSI_PARAM_IMM_DATA_EN:
3210 sscanf(buf, "%d", &session->imm_data_en);
3211 break;
3212 case ISCSI_PARAM_FIRST_BURST:
3213 sscanf(buf, "%d", &session->first_burst);
3214 break;
3215 case ISCSI_PARAM_MAX_BURST:
3216 sscanf(buf, "%d", &session->max_burst);
3217 break;
3218 case ISCSI_PARAM_PDU_INORDER_EN:
3219 sscanf(buf, "%d", &session->pdu_inorder_en);
3220 break;
3221 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3222 sscanf(buf, "%d", &session->dataseq_inorder_en);
3223 break;
3224 case ISCSI_PARAM_ERL:
3225 sscanf(buf, "%d", &session->erl);
3226 break;
Mike Christiea54a52c2006-06-28 12:00:23 -05003227 case ISCSI_PARAM_EXP_STATSN:
3228 sscanf(buf, "%u", &conn->exp_statsn);
3229 break;
Mike Christieb2c64162007-05-30 12:57:16 -05003230 case ISCSI_PARAM_USERNAME:
Mike Christie5700b1a2009-05-13 17:57:40 -05003231 return iscsi_switch_str_param(&session->username, buf);
Mike Christieb2c64162007-05-30 12:57:16 -05003232 case ISCSI_PARAM_USERNAME_IN:
Mike Christie5700b1a2009-05-13 17:57:40 -05003233 return iscsi_switch_str_param(&session->username_in, buf);
Mike Christieb2c64162007-05-30 12:57:16 -05003234 case ISCSI_PARAM_PASSWORD:
Mike Christie5700b1a2009-05-13 17:57:40 -05003235 return iscsi_switch_str_param(&session->password, buf);
Mike Christieb2c64162007-05-30 12:57:16 -05003236 case ISCSI_PARAM_PASSWORD_IN:
Mike Christie5700b1a2009-05-13 17:57:40 -05003237 return iscsi_switch_str_param(&session->password_in, buf);
Mike Christiea54a52c2006-06-28 12:00:23 -05003238 case ISCSI_PARAM_TARGET_NAME:
Mike Christie5700b1a2009-05-13 17:57:40 -05003239 return iscsi_switch_str_param(&session->targetname, buf);
Vikas Chaudhary3c5c4802012-01-19 03:06:53 -08003240 case ISCSI_PARAM_TARGET_ALIAS:
3241 return iscsi_switch_str_param(&session->targetalias, buf);
Mike Christiea54a52c2006-06-28 12:00:23 -05003242 case ISCSI_PARAM_TPGT:
3243 sscanf(buf, "%d", &session->tpgt);
3244 break;
3245 case ISCSI_PARAM_PERSISTENT_PORT:
3246 sscanf(buf, "%d", &conn->persistent_port);
3247 break;
3248 case ISCSI_PARAM_PERSISTENT_ADDRESS:
Mike Christie5700b1a2009-05-13 17:57:40 -05003249 return iscsi_switch_str_param(&conn->persistent_address, buf);
Mike Christie88dfd342008-05-21 15:54:16 -05003250 case ISCSI_PARAM_IFACE_NAME:
Mike Christie5700b1a2009-05-13 17:57:40 -05003251 return iscsi_switch_str_param(&session->ifacename, buf);
Mike Christie88dfd342008-05-21 15:54:16 -05003252 case ISCSI_PARAM_INITIATOR_NAME:
Mike Christie5700b1a2009-05-13 17:57:40 -05003253 return iscsi_switch_str_param(&session->initiatorname, buf);
Eddie Wai3b9373e2013-06-20 10:21:26 -07003254 case ISCSI_PARAM_BOOT_ROOT:
3255 return iscsi_switch_str_param(&session->boot_root, buf);
3256 case ISCSI_PARAM_BOOT_NIC:
3257 return iscsi_switch_str_param(&session->boot_nic, buf);
3258 case ISCSI_PARAM_BOOT_TARGET:
3259 return iscsi_switch_str_param(&session->boot_target, buf);
Mike Christiea54a52c2006-06-28 12:00:23 -05003260 default:
3261 return -ENOSYS;
3262 }
3263
3264 return 0;
3265}
3266EXPORT_SYMBOL_GPL(iscsi_set_param);
3267
3268int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
3269 enum iscsi_param param, char *buf)
3270{
Mike Christie75613522008-05-21 15:53:59 -05003271 struct iscsi_session *session = cls_session->dd_data;
Mike Christiea54a52c2006-06-28 12:00:23 -05003272 int len;
3273
3274 switch(param) {
Mike Christie843c0a82007-12-13 12:43:20 -06003275 case ISCSI_PARAM_FAST_ABORT:
3276 len = sprintf(buf, "%d\n", session->fast_abort);
3277 break;
Mike Christief6d51802007-12-13 12:43:30 -06003278 case ISCSI_PARAM_ABORT_TMO:
3279 len = sprintf(buf, "%d\n", session->abort_timeout);
3280 break;
3281 case ISCSI_PARAM_LU_RESET_TMO:
3282 len = sprintf(buf, "%d\n", session->lu_reset_timeout);
3283 break;
Mike Christie3fe5ae82009-11-11 16:34:33 -06003284 case ISCSI_PARAM_TGT_RESET_TMO:
3285 len = sprintf(buf, "%d\n", session->tgt_reset_timeout);
3286 break;
Mike Christiea54a52c2006-06-28 12:00:23 -05003287 case ISCSI_PARAM_INITIAL_R2T_EN:
3288 len = sprintf(buf, "%d\n", session->initial_r2t_en);
3289 break;
3290 case ISCSI_PARAM_MAX_R2T:
3291 len = sprintf(buf, "%hu\n", session->max_r2t);
3292 break;
3293 case ISCSI_PARAM_IMM_DATA_EN:
3294 len = sprintf(buf, "%d\n", session->imm_data_en);
3295 break;
3296 case ISCSI_PARAM_FIRST_BURST:
3297 len = sprintf(buf, "%u\n", session->first_burst);
3298 break;
3299 case ISCSI_PARAM_MAX_BURST:
3300 len = sprintf(buf, "%u\n", session->max_burst);
3301 break;
3302 case ISCSI_PARAM_PDU_INORDER_EN:
3303 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
3304 break;
3305 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3306 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
3307 break;
3308 case ISCSI_PARAM_ERL:
3309 len = sprintf(buf, "%d\n", session->erl);
3310 break;
3311 case ISCSI_PARAM_TARGET_NAME:
3312 len = sprintf(buf, "%s\n", session->targetname);
3313 break;
Vikas Chaudhary3c5c4802012-01-19 03:06:53 -08003314 case ISCSI_PARAM_TARGET_ALIAS:
3315 len = sprintf(buf, "%s\n", session->targetalias);
3316 break;
Mike Christiea54a52c2006-06-28 12:00:23 -05003317 case ISCSI_PARAM_TPGT:
3318 len = sprintf(buf, "%d\n", session->tpgt);
3319 break;
Mike Christieb2c64162007-05-30 12:57:16 -05003320 case ISCSI_PARAM_USERNAME:
3321 len = sprintf(buf, "%s\n", session->username);
3322 break;
3323 case ISCSI_PARAM_USERNAME_IN:
3324 len = sprintf(buf, "%s\n", session->username_in);
3325 break;
3326 case ISCSI_PARAM_PASSWORD:
3327 len = sprintf(buf, "%s\n", session->password);
3328 break;
3329 case ISCSI_PARAM_PASSWORD_IN:
3330 len = sprintf(buf, "%s\n", session->password_in);
3331 break;
Mike Christie88dfd342008-05-21 15:54:16 -05003332 case ISCSI_PARAM_IFACE_NAME:
3333 len = sprintf(buf, "%s\n", session->ifacename);
3334 break;
3335 case ISCSI_PARAM_INITIATOR_NAME:
Mike Christie5700b1a2009-05-13 17:57:40 -05003336 len = sprintf(buf, "%s\n", session->initiatorname);
Mike Christie88dfd342008-05-21 15:54:16 -05003337 break;
Eddie Wai3b9373e2013-06-20 10:21:26 -07003338 case ISCSI_PARAM_BOOT_ROOT:
3339 len = sprintf(buf, "%s\n", session->boot_root);
3340 break;
3341 case ISCSI_PARAM_BOOT_NIC:
3342 len = sprintf(buf, "%s\n", session->boot_nic);
3343 break;
3344 case ISCSI_PARAM_BOOT_TARGET:
3345 len = sprintf(buf, "%s\n", session->boot_target);
3346 break;
Mike Christiea54a52c2006-06-28 12:00:23 -05003347 default:
3348 return -ENOSYS;
3349 }
3350
3351 return len;
3352}
3353EXPORT_SYMBOL_GPL(iscsi_session_get_param);
3354
Mike Christie00f37082011-02-16 15:04:35 -06003355int iscsi_conn_get_addr_param(struct sockaddr_storage *addr,
3356 enum iscsi_param param, char *buf)
3357{
3358 struct sockaddr_in6 *sin6 = NULL;
3359 struct sockaddr_in *sin = NULL;
3360 int len;
3361
3362 switch (addr->ss_family) {
3363 case AF_INET:
3364 sin = (struct sockaddr_in *)addr;
3365 break;
3366 case AF_INET6:
3367 sin6 = (struct sockaddr_in6 *)addr;
3368 break;
3369 default:
3370 return -EINVAL;
3371 }
3372
3373 switch (param) {
3374 case ISCSI_PARAM_CONN_ADDRESS:
3375 case ISCSI_HOST_PARAM_IPADDRESS:
3376 if (sin)
3377 len = sprintf(buf, "%pI4\n", &sin->sin_addr.s_addr);
3378 else
3379 len = sprintf(buf, "%pI6\n", &sin6->sin6_addr);
3380 break;
3381 case ISCSI_PARAM_CONN_PORT:
3382 if (sin)
3383 len = sprintf(buf, "%hu\n", be16_to_cpu(sin->sin_port));
3384 else
3385 len = sprintf(buf, "%hu\n",
3386 be16_to_cpu(sin6->sin6_port));
3387 break;
3388 default:
3389 return -EINVAL;
3390 }
3391
3392 return len;
3393}
3394EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param);
3395
Mike Christiea54a52c2006-06-28 12:00:23 -05003396int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
3397 enum iscsi_param param, char *buf)
3398{
3399 struct iscsi_conn *conn = cls_conn->dd_data;
3400 int len;
3401
3402 switch(param) {
Mike Christief6d51802007-12-13 12:43:30 -06003403 case ISCSI_PARAM_PING_TMO:
3404 len = sprintf(buf, "%u\n", conn->ping_timeout);
3405 break;
3406 case ISCSI_PARAM_RECV_TMO:
3407 len = sprintf(buf, "%u\n", conn->recv_timeout);
3408 break;
Mike Christiea54a52c2006-06-28 12:00:23 -05003409 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3410 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
3411 break;
3412 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3413 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
3414 break;
3415 case ISCSI_PARAM_HDRDGST_EN:
3416 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
3417 break;
3418 case ISCSI_PARAM_DATADGST_EN:
3419 len = sprintf(buf, "%d\n", conn->datadgst_en);
3420 break;
3421 case ISCSI_PARAM_IFMARKER_EN:
3422 len = sprintf(buf, "%d\n", conn->ifmarker_en);
3423 break;
3424 case ISCSI_PARAM_OFMARKER_EN:
3425 len = sprintf(buf, "%d\n", conn->ofmarker_en);
3426 break;
3427 case ISCSI_PARAM_EXP_STATSN:
3428 len = sprintf(buf, "%u\n", conn->exp_statsn);
3429 break;
3430 case ISCSI_PARAM_PERSISTENT_PORT:
3431 len = sprintf(buf, "%d\n", conn->persistent_port);
3432 break;
3433 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3434 len = sprintf(buf, "%s\n", conn->persistent_address);
3435 break;
3436 default:
3437 return -ENOSYS;
3438 }
3439
3440 return len;
3441}
3442EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
3443
Mike Christie0801c242007-05-30 12:57:12 -05003444int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3445 char *buf)
3446{
Mike Christie75613522008-05-21 15:53:59 -05003447 struct iscsi_host *ihost = shost_priv(shost);
Mike Christie0801c242007-05-30 12:57:12 -05003448 int len;
3449
3450 switch (param) {
Mike Christied8196ed2007-05-30 12:57:25 -05003451 case ISCSI_HOST_PARAM_NETDEV_NAME:
Mike Christie5700b1a2009-05-13 17:57:40 -05003452 len = sprintf(buf, "%s\n", ihost->netdev);
Mike Christied8196ed2007-05-30 12:57:25 -05003453 break;
Mike Christie0801c242007-05-30 12:57:12 -05003454 case ISCSI_HOST_PARAM_HWADDRESS:
Mike Christie5700b1a2009-05-13 17:57:40 -05003455 len = sprintf(buf, "%s\n", ihost->hwaddress);
Mike Christie0801c242007-05-30 12:57:12 -05003456 break;
Mike Christie8ad57812007-05-30 12:57:13 -05003457 case ISCSI_HOST_PARAM_INITIATOR_NAME:
Mike Christie5700b1a2009-05-13 17:57:40 -05003458 len = sprintf(buf, "%s\n", ihost->initiatorname);
Mike Christie8ad57812007-05-30 12:57:13 -05003459 break;
Mike Christie0801c242007-05-30 12:57:12 -05003460 default:
3461 return -ENOSYS;
3462 }
3463
3464 return len;
3465}
3466EXPORT_SYMBOL_GPL(iscsi_host_get_param);
3467
3468int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3469 char *buf, int buflen)
3470{
Mike Christie75613522008-05-21 15:53:59 -05003471 struct iscsi_host *ihost = shost_priv(shost);
Mike Christie0801c242007-05-30 12:57:12 -05003472
3473 switch (param) {
Mike Christied8196ed2007-05-30 12:57:25 -05003474 case ISCSI_HOST_PARAM_NETDEV_NAME:
Mike Christie5700b1a2009-05-13 17:57:40 -05003475 return iscsi_switch_str_param(&ihost->netdev, buf);
Mike Christie0801c242007-05-30 12:57:12 -05003476 case ISCSI_HOST_PARAM_HWADDRESS:
Mike Christie5700b1a2009-05-13 17:57:40 -05003477 return iscsi_switch_str_param(&ihost->hwaddress, buf);
Mike Christie8ad57812007-05-30 12:57:13 -05003478 case ISCSI_HOST_PARAM_INITIATOR_NAME:
Mike Christie5700b1a2009-05-13 17:57:40 -05003479 return iscsi_switch_str_param(&ihost->initiatorname, buf);
Mike Christie0801c242007-05-30 12:57:12 -05003480 default:
3481 return -ENOSYS;
3482 }
3483
3484 return 0;
3485}
3486EXPORT_SYMBOL_GPL(iscsi_host_set_param);
3487
Mike Christie7996a772006-04-06 21:13:41 -05003488MODULE_AUTHOR("Mike Christie");
3489MODULE_DESCRIPTION("iSCSI library functions");
3490MODULE_LICENSE("GPL");