blob: cc8f2a7c24630b93e4f8a9e2da0906f09e359950 [file] [log] [blame]
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 &&
Mike Christie46a84c62014-02-07 00:41:39 -0600113 !iscsi_sna_lt(max_cmdsn, session->max_cmdsn))
Mike Christie77a23c22007-05-30 12:57:18 -0500114 session->max_cmdsn = max_cmdsn;
Mike Christie7996a772006-04-06 21:13:41 -0500115}
Mike Christie4c0ba5d2009-09-05 07:34:23 +0530116
117void iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
118{
119 __iscsi_update_cmdsn(session, be32_to_cpu(hdr->exp_cmdsn),
120 be32_to_cpu(hdr->max_cmdsn));
121}
Mike Christie77a23c22007-05-30 12:57:18 -0500122EXPORT_SYMBOL_GPL(iscsi_update_cmdsn);
Mike Christie7996a772006-04-06 21:13:41 -0500123
Mike Christie577577d2008-12-02 00:32:05 -0600124/**
125 * iscsi_prep_data_out_pdu - initialize Data-Out
126 * @task: scsi command task
127 * @r2t: R2T info
128 * @hdr: iscsi data in pdu
129 *
130 * Notes:
131 * Initialize Data-Out within this R2T sequence and finds
132 * proper data_offset within this SCSI command.
133 *
134 * This function is called with connection lock taken.
135 **/
136void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t,
137 struct iscsi_data *hdr)
Mike Christie7996a772006-04-06 21:13:41 -0500138{
Mike Christie9c19a7d2008-05-21 15:54:09 -0500139 struct iscsi_conn *conn = task->conn;
Mike Christie577577d2008-12-02 00:32:05 -0600140 unsigned int left = r2t->data_length - r2t->sent;
141
142 task->hdr_len = sizeof(struct iscsi_data);
Mike Christie7996a772006-04-06 21:13:41 -0500143
144 memset(hdr, 0, sizeof(struct iscsi_data));
Mike Christie577577d2008-12-02 00:32:05 -0600145 hdr->ttt = r2t->ttt;
146 hdr->datasn = cpu_to_be32(r2t->datasn);
147 r2t->datasn++;
Mike Christie7996a772006-04-06 21:13:41 -0500148 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
Andy Grover55bdabd2011-06-16 15:57:09 -0700149 hdr->lun = task->lun;
Mike Christie577577d2008-12-02 00:32:05 -0600150 hdr->itt = task->hdr_itt;
151 hdr->exp_statsn = r2t->exp_statsn;
152 hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent);
153 if (left > conn->max_xmit_dlength) {
Mike Christie7996a772006-04-06 21:13:41 -0500154 hton24(hdr->dlength, conn->max_xmit_dlength);
Mike Christie577577d2008-12-02 00:32:05 -0600155 r2t->data_count = conn->max_xmit_dlength;
Mike Christie7996a772006-04-06 21:13:41 -0500156 hdr->flags = 0;
157 } else {
Mike Christie577577d2008-12-02 00:32:05 -0600158 hton24(hdr->dlength, left);
159 r2t->data_count = left;
Mike Christie7996a772006-04-06 21:13:41 -0500160 hdr->flags = ISCSI_FLAG_CMD_FINAL;
161 }
Mike Christie577577d2008-12-02 00:32:05 -0600162 conn->dataout_pdus_cnt++;
Mike Christie7996a772006-04-06 21:13:41 -0500163}
Mike Christie577577d2008-12-02 00:32:05 -0600164EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu);
Mike Christie7996a772006-04-06 21:13:41 -0500165
Mike Christie9c19a7d2008-05-21 15:54:09 -0500166static int iscsi_add_hdr(struct iscsi_task *task, unsigned len)
Boaz Harrosh004d6532007-12-13 12:43:23 -0600167{
Mike Christie9c19a7d2008-05-21 15:54:09 -0500168 unsigned exp_len = task->hdr_len + len;
Boaz Harrosh004d6532007-12-13 12:43:23 -0600169
Mike Christie9c19a7d2008-05-21 15:54:09 -0500170 if (exp_len > task->hdr_max) {
Boaz Harrosh004d6532007-12-13 12:43:23 -0600171 WARN_ON(1);
172 return -EINVAL;
173 }
174
175 WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */
Mike Christie9c19a7d2008-05-21 15:54:09 -0500176 task->hdr_len = exp_len;
Boaz Harrosh004d6532007-12-13 12:43:23 -0600177 return 0;
178}
179
Boaz Harrosh38d1c062008-04-18 10:11:51 -0500180/*
181 * make an extended cdb AHS
182 */
Mike Christie9c19a7d2008-05-21 15:54:09 -0500183static int iscsi_prep_ecdb_ahs(struct iscsi_task *task)
Boaz Harrosh38d1c062008-04-18 10:11:51 -0500184{
Mike Christie9c19a7d2008-05-21 15:54:09 -0500185 struct scsi_cmnd *cmd = task->sc;
Boaz Harrosh38d1c062008-04-18 10:11:51 -0500186 unsigned rlen, pad_len;
187 unsigned short ahslength;
188 struct iscsi_ecdb_ahdr *ecdb_ahdr;
189 int rc;
190
Mike Christie9c19a7d2008-05-21 15:54:09 -0500191 ecdb_ahdr = iscsi_next_hdr(task);
Boaz Harrosh38d1c062008-04-18 10:11:51 -0500192 rlen = cmd->cmd_len - ISCSI_CDB_SIZE;
193
194 BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb));
195 ahslength = rlen + sizeof(ecdb_ahdr->reserved);
196
197 pad_len = iscsi_padding(rlen);
198
Mike Christie9c19a7d2008-05-21 15:54:09 -0500199 rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) +
Boaz Harrosh38d1c062008-04-18 10:11:51 -0500200 sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len);
201 if (rc)
202 return rc;
203
204 if (pad_len)
205 memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len);
206
207 ecdb_ahdr->ahslength = cpu_to_be16(ahslength);
208 ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB;
209 ecdb_ahdr->reserved = 0;
210 memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen);
211
Mike Christie1b2c7af2009-03-05 14:45:58 -0600212 ISCSI_DBG_SESSION(task->conn->session,
213 "iscsi_prep_ecdb_ahs: varlen_cdb_len %d "
214 "rlen %d pad_len %d ahs_length %d iscsi_headers_size "
215 "%u\n", cmd->cmd_len, rlen, pad_len, ahslength,
216 task->hdr_len);
Boaz Harrosh38d1c062008-04-18 10:11:51 -0500217 return 0;
218}
219
Mike Christie9c19a7d2008-05-21 15:54:09 -0500220static int iscsi_prep_bidi_ahs(struct iscsi_task *task)
Boaz Harroshc07d4442008-04-18 10:11:52 -0500221{
Mike Christie9c19a7d2008-05-21 15:54:09 -0500222 struct scsi_cmnd *sc = task->sc;
Boaz Harroshc07d4442008-04-18 10:11:52 -0500223 struct iscsi_rlength_ahdr *rlen_ahdr;
224 int rc;
225
Mike Christie9c19a7d2008-05-21 15:54:09 -0500226 rlen_ahdr = iscsi_next_hdr(task);
227 rc = iscsi_add_hdr(task, sizeof(*rlen_ahdr));
Boaz Harroshc07d4442008-04-18 10:11:52 -0500228 if (rc)
229 return rc;
230
231 rlen_ahdr->ahslength =
232 cpu_to_be16(sizeof(rlen_ahdr->read_length) +
233 sizeof(rlen_ahdr->reserved));
234 rlen_ahdr->ahstype = ISCSI_AHSTYPE_RLENGTH;
235 rlen_ahdr->reserved = 0;
236 rlen_ahdr->read_length = cpu_to_be32(scsi_in(sc)->length);
237
Mike Christie1b2c7af2009-03-05 14:45:58 -0600238 ISCSI_DBG_SESSION(task->conn->session,
239 "bidi-in rlen_ahdr->read_length(%d) "
240 "rlen_ahdr->ahslength(%d)\n",
241 be32_to_cpu(rlen_ahdr->read_length),
242 be16_to_cpu(rlen_ahdr->ahslength));
Boaz Harroshc07d4442008-04-18 10:11:52 -0500243 return 0;
244}
245
Mike Christie7996a772006-04-06 21:13:41 -0500246/**
Mike Christie5d12c052009-11-11 16:34:32 -0600247 * iscsi_check_tmf_restrictions - check if a task is affected by TMF
248 * @task: iscsi task
249 * @opcode: opcode to check for
250 *
251 * During TMF a task has to be checked if it's affected.
252 * All unrelated I/O can be passed through, but I/O to the
253 * affected LUN should be restricted.
254 * If 'fast_abort' is set we won't be sending any I/O to the
255 * affected LUN.
256 * Otherwise the target is waiting for all TTTs to be completed,
257 * so we have to send all outstanding Data-Out PDUs to the target.
258 */
259static int iscsi_check_tmf_restrictions(struct iscsi_task *task, int opcode)
260{
261 struct iscsi_conn *conn = task->conn;
262 struct iscsi_tm *tmf = &conn->tmhdr;
Hannes Reinecke9cb78c12014-06-25 15:27:36 +0200263 u64 hdr_lun;
Mike Christie5d12c052009-11-11 16:34:32 -0600264
265 if (conn->tmf_state == TMF_INITIAL)
266 return 0;
267
268 if ((tmf->opcode & ISCSI_OPCODE_MASK) != ISCSI_OP_SCSI_TMFUNC)
269 return 0;
270
271 switch (ISCSI_TM_FUNC_VALUE(tmf)) {
272 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
273 /*
274 * Allow PDUs for unrelated LUNs
275 */
Andy Grover55bdabd2011-06-16 15:57:09 -0700276 hdr_lun = scsilun_to_int(&tmf->lun);
Mike Christie5d12c052009-11-11 16:34:32 -0600277 if (hdr_lun != task->sc->device->lun)
278 return 0;
Mike Christie3fe5ae82009-11-11 16:34:33 -0600279 /* fall through */
280 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
Mike Christie5d12c052009-11-11 16:34:32 -0600281 /*
282 * Fail all SCSI cmd PDUs
283 */
284 if (opcode != ISCSI_OP_SCSI_DATA_OUT) {
285 iscsi_conn_printk(KERN_INFO, conn,
Varun Prakash0a04fdb2018-07-11 22:09:52 +0530286 "task [op %x itt "
Mike Christie3fe5ae82009-11-11 16:34:33 -0600287 "0x%x/0x%x] "
Mike Christie5d12c052009-11-11 16:34:32 -0600288 "rejected.\n",
Varun Prakash0a04fdb2018-07-11 22:09:52 +0530289 opcode, task->itt,
290 task->hdr_itt);
Mike Christie5d12c052009-11-11 16:34:32 -0600291 return -EACCES;
292 }
293 /*
294 * And also all data-out PDUs in response to R2T
295 * if fast_abort is set.
296 */
297 if (conn->session->fast_abort) {
298 iscsi_conn_printk(KERN_INFO, conn,
Varun Prakash0a04fdb2018-07-11 22:09:52 +0530299 "task [op %x itt "
Mike Christie3fe5ae82009-11-11 16:34:33 -0600300 "0x%x/0x%x] fast abort.\n",
Varun Prakash0a04fdb2018-07-11 22:09:52 +0530301 opcode, task->itt,
302 task->hdr_itt);
Mike Christie5d12c052009-11-11 16:34:32 -0600303 return -EACCES;
304 }
305 break;
306 case ISCSI_TM_FUNC_ABORT_TASK:
307 /*
308 * the caller has already checked if the task
309 * they want to abort was in the pending queue so if
310 * we are here the cmd pdu has gone out already, and
311 * we will only hit this for data-outs
312 */
313 if (opcode == ISCSI_OP_SCSI_DATA_OUT &&
314 task->hdr_itt == tmf->rtt) {
315 ISCSI_DBG_SESSION(conn->session,
316 "Preventing task %x/%x from sending "
317 "data-out due to abort task in "
318 "progress\n", task->itt,
319 task->hdr_itt);
320 return -EACCES;
321 }
322 break;
323 }
324
325 return 0;
326}
327
328/**
Mike Christie7996a772006-04-06 21:13:41 -0500329 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
Mike Christie9c19a7d2008-05-21 15:54:09 -0500330 * @task: iscsi task
Mike Christie7996a772006-04-06 21:13:41 -0500331 *
332 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
333 * fields like dlength or final based on how much data it sends
334 */
Mike Christie9c19a7d2008-05-21 15:54:09 -0500335static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
Mike Christie7996a772006-04-06 21:13:41 -0500336{
Mike Christie9c19a7d2008-05-21 15:54:09 -0500337 struct iscsi_conn *conn = task->conn;
Mike Christie7996a772006-04-06 21:13:41 -0500338 struct iscsi_session *session = conn->session;
Mike Christie9c19a7d2008-05-21 15:54:09 -0500339 struct scsi_cmnd *sc = task->sc;
Nicholas Bellinger12352182011-05-27 11:16:33 +0000340 struct iscsi_scsi_req *hdr;
Sagi Grimbergd77e6532014-06-11 12:09:58 +0300341 unsigned hdrlength, cmd_len, transfer_length;
Mike Christie262ef632008-12-02 00:32:13 -0600342 itt_t itt;
Boaz Harrosh004d6532007-12-13 12:43:23 -0600343 int rc;
Mike Christie7996a772006-04-06 21:13:41 -0500344
Mike Christie5d12c052009-11-11 16:34:32 -0600345 rc = iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_CMD);
346 if (rc)
347 return rc;
348
Mike Christie184b57c2009-05-13 17:57:39 -0500349 if (conn->session->tt->alloc_pdu) {
350 rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD);
351 if (rc)
352 return rc;
353 }
Nicholas Bellinger12352182011-05-27 11:16:33 +0000354 hdr = (struct iscsi_scsi_req *)task->hdr;
Mike Christie262ef632008-12-02 00:32:13 -0600355 itt = hdr->itt;
Mike Christie577577d2008-12-02 00:32:05 -0600356 memset(hdr, 0, sizeof(*hdr));
357
Mike Christie2ff79d52008-12-02 00:32:14 -0600358 if (session->tt->parse_pdu_itt)
359 hdr->itt = task->hdr_itt = itt;
360 else
361 hdr->itt = task->hdr_itt = build_itt(task->itt,
362 task->conn->session->age);
Mike Christie9c19a7d2008-05-21 15:54:09 -0500363 task->hdr_len = 0;
364 rc = iscsi_add_hdr(task, sizeof(*hdr));
Boaz Harrosh004d6532007-12-13 12:43:23 -0600365 if (rc)
366 return rc;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600367 hdr->opcode = ISCSI_OP_SCSI_CMD;
368 hdr->flags = ISCSI_ATTR_SIMPLE;
Andy Grover55bdabd2011-06-16 15:57:09 -0700369 int_to_scsilun(sc->device->lun, &hdr->lun);
370 task->lun = hdr->lun;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600371 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
Boaz Harrosh38d1c062008-04-18 10:11:51 -0500372 cmd_len = sc->cmd_len;
373 if (cmd_len < ISCSI_CDB_SIZE)
374 memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len);
375 else if (cmd_len > ISCSI_CDB_SIZE) {
Mike Christie9c19a7d2008-05-21 15:54:09 -0500376 rc = iscsi_prep_ecdb_ahs(task);
Boaz Harrosh38d1c062008-04-18 10:11:51 -0500377 if (rc)
378 return rc;
379 cmd_len = ISCSI_CDB_SIZE;
380 }
381 memcpy(hdr->cdb, sc->cmnd, cmd_len);
Mike Christie7996a772006-04-06 21:13:41 -0500382
Mike Christie9c19a7d2008-05-21 15:54:09 -0500383 task->imm_count = 0;
Boaz Harroshc07d4442008-04-18 10:11:52 -0500384 if (scsi_bidi_cmnd(sc)) {
385 hdr->flags |= ISCSI_FLAG_CMD_READ;
Mike Christie9c19a7d2008-05-21 15:54:09 -0500386 rc = iscsi_prep_bidi_ahs(task);
Boaz Harroshc07d4442008-04-18 10:11:52 -0500387 if (rc)
388 return rc;
389 }
Sagi Grimberg55e51ed2014-03-05 19:43:49 +0200390
391 if (scsi_get_prot_op(sc) != SCSI_PROT_NORMAL)
392 task->protected = true;
393
Sagi Grimbergd77e6532014-06-11 12:09:58 +0300394 transfer_length = scsi_transfer_length(sc);
395 hdr->data_length = cpu_to_be32(transfer_length);
Mike Christie7996a772006-04-06 21:13:41 -0500396 if (sc->sc_data_direction == DMA_TO_DEVICE) {
Mike Christie577577d2008-12-02 00:32:05 -0600397 struct iscsi_r2t_info *r2t = &task->unsol_r2t;
398
Mike Christie7996a772006-04-06 21:13:41 -0500399 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
400 /*
401 * Write counters:
402 *
403 * imm_count bytes to be sent right after
404 * SCSI PDU Header
405 *
406 * unsol_count bytes(as Data-Out) to be sent
407 * without R2T ack right after
408 * immediate data
409 *
Mike Christie577577d2008-12-02 00:32:05 -0600410 * r2t data_length bytes to be sent via R2T ack's
Mike Christie7996a772006-04-06 21:13:41 -0500411 *
412 * pad_count bytes to be sent as zero-padding
413 */
Mike Christie577577d2008-12-02 00:32:05 -0600414 memset(r2t, 0, sizeof(*r2t));
Mike Christie7996a772006-04-06 21:13:41 -0500415
416 if (session->imm_data_en) {
Sagi Grimbergd77e6532014-06-11 12:09:58 +0300417 if (transfer_length >= session->first_burst)
Mike Christie9c19a7d2008-05-21 15:54:09 -0500418 task->imm_count = min(session->first_burst,
Mike Christie7996a772006-04-06 21:13:41 -0500419 conn->max_xmit_dlength);
420 else
Sagi Grimbergd77e6532014-06-11 12:09:58 +0300421 task->imm_count = min(transfer_length,
422 conn->max_xmit_dlength);
Mike Christie9c19a7d2008-05-21 15:54:09 -0500423 hton24(hdr->dlength, task->imm_count);
Mike Christie7996a772006-04-06 21:13:41 -0500424 } else
Olaf Kircha8ac6312007-12-13 12:43:35 -0600425 zero_data(hdr->dlength);
Mike Christie7996a772006-04-06 21:13:41 -0500426
Mike Christieffd04362006-08-31 18:09:24 -0400427 if (!session->initial_r2t_en) {
Sagi Grimbergd77e6532014-06-11 12:09:58 +0300428 r2t->data_length = min(session->first_burst,
429 transfer_length) -
Mike Christie577577d2008-12-02 00:32:05 -0600430 task->imm_count;
431 r2t->data_offset = task->imm_count;
432 r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
433 r2t->exp_statsn = cpu_to_be32(conn->exp_statsn);
Mike Christieffd04362006-08-31 18:09:24 -0400434 }
435
Mike Christie577577d2008-12-02 00:32:05 -0600436 if (!task->unsol_r2t.data_length)
Mike Christie7996a772006-04-06 21:13:41 -0500437 /* No unsolicit Data-Out's */
Olaf Kircha8ac6312007-12-13 12:43:35 -0600438 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
Mike Christie7996a772006-04-06 21:13:41 -0500439 } else {
Mike Christie7996a772006-04-06 21:13:41 -0500440 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
441 zero_data(hdr->dlength);
442
443 if (sc->sc_data_direction == DMA_FROM_DEVICE)
444 hdr->flags |= ISCSI_FLAG_CMD_READ;
445 }
446
Boaz Harrosh004d6532007-12-13 12:43:23 -0600447 /* calculate size of additional header segments (AHSs) */
Mike Christie9c19a7d2008-05-21 15:54:09 -0500448 hdrlength = task->hdr_len - sizeof(*hdr);
Boaz Harrosh004d6532007-12-13 12:43:23 -0600449
450 WARN_ON(hdrlength & (ISCSI_PAD_LEN-1));
451 hdrlength /= ISCSI_PAD_LEN;
452
453 WARN_ON(hdrlength >= 256);
454 hdr->hlength = hdrlength & 0xFF;
Mike Christie96b1f962010-04-24 16:21:19 -0500455 hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn);
Boaz Harrosh004d6532007-12-13 12:43:23 -0600456
Mike Christie577577d2008-12-02 00:32:05 -0600457 if (session->tt->init_task && session->tt->init_task(task))
Mike Christie052d0142008-05-21 15:54:05 -0500458 return -EIO;
459
Mike Christie9c19a7d2008-05-21 15:54:09 -0500460 task->state = ISCSI_TASK_RUNNING;
Mike Christied3305f32009-08-20 15:10:58 -0500461 session->cmdsn++;
Mike Christie77a23c22007-05-30 12:57:18 -0500462
Olaf Kircha8ac6312007-12-13 12:43:35 -0600463 conn->scsicmd_pdus_cnt++;
Mike Christie1b2c7af2009-03-05 14:45:58 -0600464 ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x "
465 "itt 0x%x len %d bidi_len %d cmdsn %d win %d]\n",
466 scsi_bidi_cmnd(sc) ? "bidirectional" :
467 sc->sc_data_direction == DMA_TO_DEVICE ?
468 "write" : "read", conn->id, sc, sc->cmnd[0],
Sagi Grimbergd77e6532014-06-11 12:09:58 +0300469 task->itt, transfer_length,
Mike Christie1b2c7af2009-03-05 14:45:58 -0600470 scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0,
471 session->cmdsn,
472 session->max_cmdsn - session->exp_cmdsn + 1);
Boaz Harrosh004d6532007-12-13 12:43:23 -0600473 return 0;
Mike Christie7996a772006-04-06 21:13:41 -0500474}
Mike Christie7996a772006-04-06 21:13:41 -0500475
476/**
Mike Christie3bbaaad2009-05-13 17:57:46 -0500477 * iscsi_free_task - free a task
Mike Christie9c19a7d2008-05-21 15:54:09 -0500478 * @task: iscsi cmd task
Mike Christie7996a772006-04-06 21:13:41 -0500479 *
Shlomo Pongratz659743b2014-02-07 00:41:38 -0600480 * Must be called with session back_lock.
Mike Christie3e5c28a2008-05-21 15:54:06 -0500481 * This function returns the scsi command to scsi-ml or cleans
482 * up mgmt tasks then returns the task to the pool.
Mike Christie7996a772006-04-06 21:13:41 -0500483 */
Mike Christie3bbaaad2009-05-13 17:57:46 -0500484static void iscsi_free_task(struct iscsi_task *task)
Mike Christie7996a772006-04-06 21:13:41 -0500485{
Mike Christie9c19a7d2008-05-21 15:54:09 -0500486 struct iscsi_conn *conn = task->conn;
Mike Christiec1635cb2007-12-13 12:43:33 -0600487 struct iscsi_session *session = conn->session;
Mike Christie9c19a7d2008-05-21 15:54:09 -0500488 struct scsi_cmnd *sc = task->sc;
Mike Christief41d4722010-12-31 02:22:21 -0600489 int oldstate = task->state;
Mike Christie7996a772006-04-06 21:13:41 -0500490
Mike Christie4421c9e2009-05-13 17:57:50 -0500491 ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n",
492 task->itt, task->state, task->sc);
493
Mike Christie577577d2008-12-02 00:32:05 -0600494 session->tt->cleanup_task(task);
Mike Christie3bbaaad2009-05-13 17:57:46 -0500495 task->state = ISCSI_TASK_FREE;
Mike Christie9c19a7d2008-05-21 15:54:09 -0500496 task->sc = NULL;
Mike Christie3e5c28a2008-05-21 15:54:06 -0500497 /*
Mike Christie9c19a7d2008-05-21 15:54:09 -0500498 * login task is preallocated so do not free
Mike Christie3e5c28a2008-05-21 15:54:06 -0500499 */
Mike Christie9c19a7d2008-05-21 15:54:09 -0500500 if (conn->login_task == task)
Mike Christie3e5c28a2008-05-21 15:54:06 -0500501 return;
502
Stefani Seibold7acd72e2009-12-21 14:37:28 -0800503 kfifo_in(&session->cmdpool.queue, (void*)&task, sizeof(void*));
Mike Christie052d0142008-05-21 15:54:05 -0500504
Mike Christie3e5c28a2008-05-21 15:54:06 -0500505 if (sc) {
Mike Christie3e5c28a2008-05-21 15:54:06 -0500506 /* SCSI eh reuses commands to verify us */
507 sc->SCp.ptr = NULL;
508 /*
Mike Christief41d4722010-12-31 02:22:21 -0600509 * queue command may call this to free the task, so
510 * it will decide how to return sc to scsi-ml.
Mike Christie3e5c28a2008-05-21 15:54:06 -0500511 */
Mike Christief41d4722010-12-31 02:22:21 -0600512 if (oldstate != ISCSI_TASK_REQUEUE_SCSIQ)
Mike Christie3e5c28a2008-05-21 15:54:06 -0500513 sc->scsi_done(sc);
514 }
Mike Christie7996a772006-04-06 21:13:41 -0500515}
516
Mike Christie913e5bf2008-05-21 15:54:18 -0500517void __iscsi_get_task(struct iscsi_task *task)
Mike Christie60ecebf2006-08-31 18:09:25 -0400518{
Mike Christie9c19a7d2008-05-21 15:54:09 -0500519 atomic_inc(&task->refcount);
Mike Christie60ecebf2006-08-31 18:09:25 -0400520}
Mike Christie913e5bf2008-05-21 15:54:18 -0500521EXPORT_SYMBOL_GPL(__iscsi_get_task);
Mike Christie60ecebf2006-08-31 18:09:25 -0400522
Eddie Wai8eea2f52010-11-23 15:29:21 -0800523void __iscsi_put_task(struct iscsi_task *task)
Mike Christie60ecebf2006-08-31 18:09:25 -0400524{
Mike Christie9c19a7d2008-05-21 15:54:09 -0500525 if (atomic_dec_and_test(&task->refcount))
Mike Christie3bbaaad2009-05-13 17:57:46 -0500526 iscsi_free_task(task);
Mike Christie60ecebf2006-08-31 18:09:25 -0400527}
Eddie Wai8eea2f52010-11-23 15:29:21 -0800528EXPORT_SYMBOL_GPL(__iscsi_put_task);
Mike Christie60ecebf2006-08-31 18:09:25 -0400529
Mike Christie9c19a7d2008-05-21 15:54:09 -0500530void iscsi_put_task(struct iscsi_task *task)
Mike Christie3e5c28a2008-05-21 15:54:06 -0500531{
Mike Christie9c19a7d2008-05-21 15:54:09 -0500532 struct iscsi_session *session = task->conn->session;
Mike Christie3e5c28a2008-05-21 15:54:06 -0500533
Shlomo Pongratz659743b2014-02-07 00:41:38 -0600534 /* regular RX path uses back_lock */
535 spin_lock_bh(&session->back_lock);
Mike Christie9c19a7d2008-05-21 15:54:09 -0500536 __iscsi_put_task(task);
Shlomo Pongratz659743b2014-02-07 00:41:38 -0600537 spin_unlock_bh(&session->back_lock);
Mike Christie3e5c28a2008-05-21 15:54:06 -0500538}
Mike Christie9c19a7d2008-05-21 15:54:09 -0500539EXPORT_SYMBOL_GPL(iscsi_put_task);
Mike Christie3e5c28a2008-05-21 15:54:06 -0500540
Mike Christie3bbaaad2009-05-13 17:57:46 -0500541/**
542 * iscsi_complete_task - finish a task
543 * @task: iscsi cmd task
Mike Christieb3cd5052009-05-13 17:57:49 -0500544 * @state: state to complete task with
Mike Christie3bbaaad2009-05-13 17:57:46 -0500545 *
Shlomo Pongratz659743b2014-02-07 00:41:38 -0600546 * Must be called with session back_lock.
Mike Christieb3a7ea82007-12-13 12:43:26 -0600547 */
Mike Christieb3cd5052009-05-13 17:57:49 -0500548static void iscsi_complete_task(struct iscsi_task *task, int state)
Mike Christieb3a7ea82007-12-13 12:43:26 -0600549{
Mike Christie3bbaaad2009-05-13 17:57:46 -0500550 struct iscsi_conn *conn = task->conn;
551
Mike Christie4421c9e2009-05-13 17:57:50 -0500552 ISCSI_DBG_SESSION(conn->session,
553 "complete task itt 0x%x state %d sc %p\n",
554 task->itt, task->state, task->sc);
Mike Christieb3cd5052009-05-13 17:57:49 -0500555 if (task->state == ISCSI_TASK_COMPLETED ||
556 task->state == ISCSI_TASK_ABRT_TMF ||
Mike Christief41d4722010-12-31 02:22:21 -0600557 task->state == ISCSI_TASK_ABRT_SESS_RECOV ||
558 task->state == ISCSI_TASK_REQUEUE_SCSIQ)
Mike Christie3bbaaad2009-05-13 17:57:46 -0500559 return;
560 WARN_ON_ONCE(task->state == ISCSI_TASK_FREE);
Mike Christieb3cd5052009-05-13 17:57:49 -0500561 task->state = state;
Mike Christie3bbaaad2009-05-13 17:57:46 -0500562
Chris Leechde1ff842017-02-27 16:58:36 -0800563 spin_lock_bh(&conn->taskqueuelock);
564 if (!list_empty(&task->running)) {
565 pr_debug_once("%s while task on list", __func__);
Mike Christie3bbaaad2009-05-13 17:57:46 -0500566 list_del_init(&task->running);
Chris Leechde1ff842017-02-27 16:58:36 -0800567 }
568 spin_unlock_bh(&conn->taskqueuelock);
Mike Christie3bbaaad2009-05-13 17:57:46 -0500569
570 if (conn->task == task)
571 conn->task = NULL;
572
573 if (conn->ping_task == task)
574 conn->ping_task = NULL;
575
576 /* release get from queueing */
577 __iscsi_put_task(task);
578}
579
Mike Christie4c0ba5d2009-09-05 07:34:23 +0530580/**
581 * iscsi_complete_scsi_task - finish scsi task normally
582 * @task: iscsi task for scsi cmd
583 * @exp_cmdsn: expected cmd sn in cpu format
584 * @max_cmdsn: max cmd sn in cpu format
585 *
586 * This is used when drivers do not need or cannot perform
587 * lower level pdu processing.
588 *
Shlomo Pongratz659743b2014-02-07 00:41:38 -0600589 * Called with session back_lock
Mike Christie4c0ba5d2009-09-05 07:34:23 +0530590 */
591void iscsi_complete_scsi_task(struct iscsi_task *task,
592 uint32_t exp_cmdsn, uint32_t max_cmdsn)
593{
594 struct iscsi_conn *conn = task->conn;
595
596 ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt);
597
598 conn->last_recv = jiffies;
599 __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn);
600 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
601}
602EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task);
603
604
Mike Christie3bbaaad2009-05-13 17:57:46 -0500605/*
Shlomo Pongratz659743b2014-02-07 00:41:38 -0600606 * session back_lock must be held and if not called for a task that is
Mike Christie3bbaaad2009-05-13 17:57:46 -0500607 * still pending or from the xmit thread, then xmit thread must
608 * be suspended.
609 */
610static void fail_scsi_task(struct iscsi_task *task, int err)
611{
612 struct iscsi_conn *conn = task->conn;
Mike Christieb3a7ea82007-12-13 12:43:26 -0600613 struct scsi_cmnd *sc;
Mike Christieb3cd5052009-05-13 17:57:49 -0500614 int state;
Mike Christieb3a7ea82007-12-13 12:43:26 -0600615
Mike Christie3bbaaad2009-05-13 17:57:46 -0500616 /*
617 * if a command completes and we get a successful tmf response
618 * we will hit this because the scsi eh abort code does not take
619 * a ref to the task.
620 */
Mike Christie9c19a7d2008-05-21 15:54:09 -0500621 sc = task->sc;
Mike Christieb3a7ea82007-12-13 12:43:26 -0600622 if (!sc)
623 return;
624
Mike Christieb3cd5052009-05-13 17:57:49 -0500625 if (task->state == ISCSI_TASK_PENDING) {
Mike Christieb3a7ea82007-12-13 12:43:26 -0600626 /*
627 * cmd never made it to the xmit thread, so we should not count
628 * the cmd in the sequencing
629 */
630 conn->session->queued_cmdsn--;
Mike Christieb3cd5052009-05-13 17:57:49 -0500631 /* it was never sent so just complete like normal */
632 state = ISCSI_TASK_COMPLETED;
633 } else if (err == DID_TRANSPORT_DISRUPTED)
634 state = ISCSI_TASK_ABRT_SESS_RECOV;
635 else
636 state = ISCSI_TASK_ABRT_TMF;
Mike Christieb3a7ea82007-12-13 12:43:26 -0600637
Mike Christieb3cd5052009-05-13 17:57:49 -0500638 sc->result = err << 16;
Boaz Harroshc07d4442008-04-18 10:11:52 -0500639 if (!scsi_bidi_cmnd(sc))
640 scsi_set_resid(sc, scsi_bufflen(sc));
641 else {
642 scsi_out(sc)->resid = scsi_out(sc)->length;
643 scsi_in(sc)->resid = scsi_in(sc)->length;
644 }
Mike Christie3e5c28a2008-05-21 15:54:06 -0500645
Shlomo Pongratz659743b2014-02-07 00:41:38 -0600646 /* regular RX path uses back_lock */
647 spin_lock_bh(&conn->session->back_lock);
Mike Christieb3cd5052009-05-13 17:57:49 -0500648 iscsi_complete_task(task, state);
Shlomo Pongratz659743b2014-02-07 00:41:38 -0600649 spin_unlock_bh(&conn->session->back_lock);
Mike Christieb3a7ea82007-12-13 12:43:26 -0600650}
651
Mike Christie3e5c28a2008-05-21 15:54:06 -0500652static int iscsi_prep_mgmt_task(struct iscsi_conn *conn,
Mike Christie9c19a7d2008-05-21 15:54:09 -0500653 struct iscsi_task *task)
Mike Christie052d0142008-05-21 15:54:05 -0500654{
655 struct iscsi_session *session = conn->session;
Mike Christie577577d2008-12-02 00:32:05 -0600656 struct iscsi_hdr *hdr = task->hdr;
Mike Christie052d0142008-05-21 15:54:05 -0500657 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
Mike Christie4f704dc2009-11-11 16:34:31 -0600658 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
Mike Christie052d0142008-05-21 15:54:05 -0500659
660 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
661 return -ENOTCONN;
662
Mike Christie4f704dc2009-11-11 16:34:31 -0600663 if (opcode != ISCSI_OP_LOGIN && opcode != ISCSI_OP_TEXT)
Mike Christie052d0142008-05-21 15:54:05 -0500664 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
665 /*
666 * pre-format CmdSN for outgoing PDU.
667 */
668 nop->cmdsn = cpu_to_be32(session->cmdsn);
669 if (hdr->itt != RESERVED_ITT) {
Mike Christie052d0142008-05-21 15:54:05 -0500670 /*
Mike Christie4f704dc2009-11-11 16:34:31 -0600671 * TODO: We always use immediate for normal session pdus.
Mike Christie052d0142008-05-21 15:54:05 -0500672 * If we start to send tmfs or nops as non-immediate then
673 * we should start checking the cmdsn numbers for mgmt tasks.
Mike Christie4f704dc2009-11-11 16:34:31 -0600674 *
675 * During discovery sessions iscsid sends TEXT as non immediate,
676 * but we always only send one PDU at a time.
Mike Christie052d0142008-05-21 15:54:05 -0500677 */
678 if (conn->c_stage == ISCSI_CONN_STARTED &&
679 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
680 session->queued_cmdsn++;
681 session->cmdsn++;
682 }
683 }
684
Mike Christieae15f802008-12-02 00:32:15 -0600685 if (session->tt->init_task && session->tt->init_task(task))
686 return -EIO;
Mike Christie052d0142008-05-21 15:54:05 -0500687
688 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT)
689 session->state = ISCSI_STATE_LOGGING_OUT;
690
Mike Christie577577d2008-12-02 00:32:05 -0600691 task->state = ISCSI_TASK_RUNNING;
Mike Christie1b2c7af2009-03-05 14:45:58 -0600692 ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x "
693 "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK,
694 hdr->itt, task->data_count);
Mike Christie052d0142008-05-21 15:54:05 -0500695 return 0;
696}
697
Mike Christie9c19a7d2008-05-21 15:54:09 -0500698static struct iscsi_task *
Mike Christief6d51802007-12-13 12:43:30 -0600699__iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
700 char *data, uint32_t data_size)
701{
702 struct iscsi_session *session = conn->session;
Mike Christie1336aed2009-05-13 17:57:48 -0500703 struct iscsi_host *ihost = shost_priv(session->host);
Mike Christie4f704dc2009-11-11 16:34:31 -0600704 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
Mike Christie9c19a7d2008-05-21 15:54:09 -0500705 struct iscsi_task *task;
Mike Christie262ef632008-12-02 00:32:13 -0600706 itt_t itt;
Mike Christief6d51802007-12-13 12:43:30 -0600707
708 if (session->state == ISCSI_STATE_TERMINATE)
709 return NULL;
710
Mike Christie4f704dc2009-11-11 16:34:31 -0600711 if (opcode == ISCSI_OP_LOGIN || opcode == ISCSI_OP_TEXT) {
Mike Christief6d51802007-12-13 12:43:30 -0600712 /*
713 * Login and Text are sent serially, in
714 * request-followed-by-response sequence.
Mike Christie3e5c28a2008-05-21 15:54:06 -0500715 * Same task can be used. Same ITT must be used.
716 * Note that login_task is preallocated at conn_create().
Mike Christief6d51802007-12-13 12:43:30 -0600717 */
Mike Christie4f704dc2009-11-11 16:34:31 -0600718 if (conn->login_task->state != ISCSI_TASK_FREE) {
719 iscsi_conn_printk(KERN_ERR, conn, "Login/Text in "
720 "progress. Cannot start new task.\n");
721 return NULL;
722 }
723
Mike Christiecbaa4222014-09-03 00:00:39 -0500724 if (data_size > ISCSI_DEF_MAX_RECV_SEG_LEN) {
725 iscsi_conn_printk(KERN_ERR, conn, "Invalid buffer len of %u for login task. Max len is %u\n", data_size, ISCSI_DEF_MAX_RECV_SEG_LEN);
726 return NULL;
727 }
728
Mike Christie9c19a7d2008-05-21 15:54:09 -0500729 task = conn->login_task;
Mike Christie4f704dc2009-11-11 16:34:31 -0600730 } else {
Mike Christie26013ad2009-05-13 17:57:43 -0500731 if (session->state != ISCSI_STATE_LOGGED_IN)
732 return NULL;
733
Mike Christiecbaa4222014-09-03 00:00:39 -0500734 if (data_size != 0) {
735 iscsi_conn_printk(KERN_ERR, conn, "Can not send data buffer of len %u for op 0x%x\n", data_size, opcode);
736 return NULL;
737 }
738
Mike Christief6d51802007-12-13 12:43:30 -0600739 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
740 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
741
Stefani Seibold7acd72e2009-12-21 14:37:28 -0800742 if (!kfifo_out(&session->cmdpool.queue,
Mike Christie9c19a7d2008-05-21 15:54:09 -0500743 (void*)&task, sizeof(void*)))
Mike Christief6d51802007-12-13 12:43:30 -0600744 return NULL;
745 }
Mike Christie3e5c28a2008-05-21 15:54:06 -0500746 /*
747 * released in complete pdu for task we expect a response for, and
748 * released by the lld when it has transmitted the task for
749 * pdus we do not expect a response for.
750 */
Mike Christie9c19a7d2008-05-21 15:54:09 -0500751 atomic_set(&task->refcount, 1);
752 task->conn = conn;
753 task->sc = NULL;
Mike Christie3bbaaad2009-05-13 17:57:46 -0500754 INIT_LIST_HEAD(&task->running);
755 task->state = ISCSI_TASK_PENDING;
Mike Christief6d51802007-12-13 12:43:30 -0600756
757 if (data_size) {
Mike Christie9c19a7d2008-05-21 15:54:09 -0500758 memcpy(task->data, data, data_size);
759 task->data_count = data_size;
Mike Christief6d51802007-12-13 12:43:30 -0600760 } else
Mike Christie9c19a7d2008-05-21 15:54:09 -0500761 task->data_count = 0;
Mike Christief6d51802007-12-13 12:43:30 -0600762
Mike Christie184b57c2009-05-13 17:57:39 -0500763 if (conn->session->tt->alloc_pdu) {
764 if (conn->session->tt->alloc_pdu(task, hdr->opcode)) {
765 iscsi_conn_printk(KERN_ERR, conn, "Could not allocate "
766 "pdu for mgmt task.\n");
Mike Christie3bbaaad2009-05-13 17:57:46 -0500767 goto free_task;
Mike Christie184b57c2009-05-13 17:57:39 -0500768 }
Mike Christie577577d2008-12-02 00:32:05 -0600769 }
Mike Christie184b57c2009-05-13 17:57:39 -0500770
Mike Christie262ef632008-12-02 00:32:13 -0600771 itt = task->hdr->itt;
Mike Christie577577d2008-12-02 00:32:05 -0600772 task->hdr_len = sizeof(struct iscsi_hdr);
Mike Christie9c19a7d2008-05-21 15:54:09 -0500773 memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr));
Mike Christie262ef632008-12-02 00:32:13 -0600774
775 if (hdr->itt != RESERVED_ITT) {
776 if (session->tt->parse_pdu_itt)
777 task->hdr->itt = itt;
778 else
779 task->hdr->itt = build_itt(task->itt,
780 task->conn->session->age);
781 }
782
Mike Christie1336aed2009-05-13 17:57:48 -0500783 if (!ihost->workq) {
Mike Christie577577d2008-12-02 00:32:05 -0600784 if (iscsi_prep_mgmt_task(conn, task))
785 goto free_task;
Mike Christie052d0142008-05-21 15:54:05 -0500786
Mike Christie9c19a7d2008-05-21 15:54:09 -0500787 if (session->tt->xmit_task(task))
Mike Christie577577d2008-12-02 00:32:05 -0600788 goto free_task;
Mike Christie3bbaaad2009-05-13 17:57:46 -0500789 } else {
Chris Leechde1ff842017-02-27 16:58:36 -0800790 spin_lock_bh(&conn->taskqueuelock);
Mike Christie3bbaaad2009-05-13 17:57:46 -0500791 list_add_tail(&task->running, &conn->mgmtqueue);
Chris Leechde1ff842017-02-27 16:58:36 -0800792 spin_unlock_bh(&conn->taskqueuelock);
Mike Christie32ae7632009-03-05 14:46:03 -0600793 iscsi_conn_queue_work(conn);
Mike Christie3bbaaad2009-05-13 17:57:46 -0500794 }
Mike Christie052d0142008-05-21 15:54:05 -0500795
Mike Christie9c19a7d2008-05-21 15:54:09 -0500796 return task;
Mike Christie577577d2008-12-02 00:32:05 -0600797
798free_task:
Shlomo Pongratz659743b2014-02-07 00:41:38 -0600799 /* regular RX path uses back_lock */
Jitendra Bhivare4fa50792016-10-13 12:08:48 +0530800 spin_lock(&session->back_lock);
Mike Christie577577d2008-12-02 00:32:05 -0600801 __iscsi_put_task(task);
Jitendra Bhivare4fa50792016-10-13 12:08:48 +0530802 spin_unlock(&session->back_lock);
Mike Christie577577d2008-12-02 00:32:05 -0600803 return NULL;
Mike Christief6d51802007-12-13 12:43:30 -0600804}
805
806int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
807 char *data, uint32_t data_size)
808{
809 struct iscsi_conn *conn = cls_conn->dd_data;
810 struct iscsi_session *session = conn->session;
811 int err = 0;
812
Shlomo Pongratz659743b2014-02-07 00:41:38 -0600813 spin_lock_bh(&session->frwd_lock);
Mike Christief6d51802007-12-13 12:43:30 -0600814 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size))
815 err = -EPERM;
Shlomo Pongratz659743b2014-02-07 00:41:38 -0600816 spin_unlock_bh(&session->frwd_lock);
Mike Christief6d51802007-12-13 12:43:30 -0600817 return err;
818}
819EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
820
Mike Christie7996a772006-04-06 21:13:41 -0500821/**
822 * iscsi_cmd_rsp - SCSI Command Response processing
823 * @conn: iscsi connection
824 * @hdr: iscsi header
Mike Christie9c19a7d2008-05-21 15:54:09 -0500825 * @task: scsi command task
Mike Christie7996a772006-04-06 21:13:41 -0500826 * @data: cmd data buffer
827 * @datalen: len of buffer
828 *
829 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
Mike Christie9c19a7d2008-05-21 15:54:09 -0500830 * then completes the command and task.
Mike Christie7996a772006-04-06 21:13:41 -0500831 **/
Mike Christie77a23c22007-05-30 12:57:18 -0500832static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
Mike Christie9c19a7d2008-05-21 15:54:09 -0500833 struct iscsi_task *task, char *data,
Mike Christie77a23c22007-05-30 12:57:18 -0500834 int datalen)
Mike Christie7996a772006-04-06 21:13:41 -0500835{
Nicholas Bellinger12352182011-05-27 11:16:33 +0000836 struct iscsi_scsi_rsp *rhdr = (struct iscsi_scsi_rsp *)hdr;
Mike Christie7996a772006-04-06 21:13:41 -0500837 struct iscsi_session *session = conn->session;
Mike Christie9c19a7d2008-05-21 15:54:09 -0500838 struct scsi_cmnd *sc = task->sc;
Mike Christie7996a772006-04-06 21:13:41 -0500839
Mike Christie77a23c22007-05-30 12:57:18 -0500840 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
Mike Christie7996a772006-04-06 21:13:41 -0500841 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
842
843 sc->result = (DID_OK << 16) | rhdr->cmd_status;
844
Sagi Grimberg55e51ed2014-03-05 19:43:49 +0200845 if (task->protected) {
846 sector_t sector;
847 u8 ascq;
848
849 /**
850 * Transports that didn't implement check_protection
851 * callback but still published T10-PI support to scsi-mid
852 * deserve this BUG_ON.
853 **/
854 BUG_ON(!session->tt->check_protection);
855
856 ascq = session->tt->check_protection(task, &sector);
857 if (ascq) {
858 sc->result = DRIVER_SENSE << 24 |
859 SAM_STAT_CHECK_CONDITION;
860 scsi_build_sense_buffer(1, sc->sense_buffer,
861 ILLEGAL_REQUEST, 0x10, ascq);
Sagi Grimberga73c2a22015-07-15 10:55:39 +0300862 scsi_set_sense_information(sc->sense_buffer,
863 SCSI_SENSE_BUFFERSIZE,
864 sector);
Sagi Grimberg55e51ed2014-03-05 19:43:49 +0200865 goto out;
866 }
867 }
868
Mike Christie7996a772006-04-06 21:13:41 -0500869 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
870 sc->result = DID_ERROR << 16;
871 goto out;
872 }
873
874 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
Mike Christie9b80cb42006-12-17 12:10:28 -0600875 uint16_t senselen;
Mike Christie7996a772006-04-06 21:13:41 -0500876
877 if (datalen < 2) {
878invalid_datalen:
Mike Christie322d7392008-01-31 13:36:52 -0600879 iscsi_conn_printk(KERN_ERR, conn,
880 "Got CHECK_CONDITION but invalid data "
881 "buffer size of %d\n", datalen);
Mike Christie7996a772006-04-06 21:13:41 -0500882 sc->result = DID_BAD_TARGET << 16;
883 goto out;
884 }
885
Harvey Harrison8f3339912008-05-21 15:54:20 -0500886 senselen = get_unaligned_be16(data);
Mike Christie7996a772006-04-06 21:13:41 -0500887 if (datalen < senselen)
888 goto invalid_datalen;
889
890 memcpy(sc->sense_buffer, data + 2,
Mike Christie9b80cb42006-12-17 12:10:28 -0600891 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
Mike Christie1b2c7af2009-03-05 14:45:58 -0600892 ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n",
893 min_t(uint16_t, senselen,
894 SCSI_SENSE_BUFFERSIZE));
Mike Christie7996a772006-04-06 21:13:41 -0500895 }
896
Boaz Harroshc07d4442008-04-18 10:11:52 -0500897 if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
898 ISCSI_FLAG_CMD_BIDI_OVERFLOW)) {
899 int res_count = be32_to_cpu(rhdr->bi_residual_count);
900
901 if (scsi_bidi_cmnd(sc) && res_count > 0 &&
902 (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW ||
903 res_count <= scsi_in(sc)->length))
904 scsi_in(sc)->resid = res_count;
905 else
906 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
907 }
908
Boaz Harrosh7207fea2007-12-13 12:43:22 -0600909 if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
910 ISCSI_FLAG_CMD_OVERFLOW)) {
Mike Christie7996a772006-04-06 21:13:41 -0500911 int res_count = be32_to_cpu(rhdr->residual_count);
912
Boaz Harrosh7207fea2007-12-13 12:43:22 -0600913 if (res_count > 0 &&
914 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
915 res_count <= scsi_bufflen(sc)))
Boaz Harroshc07d4442008-04-18 10:11:52 -0500916 /* write side for bidi or uni-io set_resid */
FUJITA Tomonori1c138992007-06-14 22:13:17 +0900917 scsi_set_resid(sc, res_count);
Mike Christie7996a772006-04-06 21:13:41 -0500918 else
919 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
Boaz Harroshc07d4442008-04-18 10:11:52 -0500920 }
Mike Christie7996a772006-04-06 21:13:41 -0500921out:
Mike Christie3bbaaad2009-05-13 17:57:46 -0500922 ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n",
Mike Christie1b2c7af2009-03-05 14:45:58 -0600923 sc, sc->result, task->itt);
Mike Christie7996a772006-04-06 21:13:41 -0500924 conn->scsirsp_pdus_cnt++;
Mike Christieb3cd5052009-05-13 17:57:49 -0500925 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
Mike Christie7996a772006-04-06 21:13:41 -0500926}
927
Mike Christie1d9edf02008-09-24 11:46:09 -0500928/**
929 * iscsi_data_in_rsp - SCSI Data-In Response processing
930 * @conn: iscsi connection
931 * @hdr: iscsi pdu
932 * @task: scsi command task
933 **/
934static void
935iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
936 struct iscsi_task *task)
937{
938 struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr;
939 struct scsi_cmnd *sc = task->sc;
940
941 if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS))
942 return;
943
Mike Christieedbc9aa052009-05-13 17:57:42 -0500944 iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr);
Mike Christie1d9edf02008-09-24 11:46:09 -0500945 sc->result = (DID_OK << 16) | rhdr->cmd_status;
946 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
947 if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW |
948 ISCSI_FLAG_DATA_OVERFLOW)) {
949 int res_count = be32_to_cpu(rhdr->residual_count);
950
951 if (res_count > 0 &&
952 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
953 res_count <= scsi_in(sc)->length))
954 scsi_in(sc)->resid = res_count;
955 else
956 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
957 }
958
Mike Christie3bbaaad2009-05-13 17:57:46 -0500959 ISCSI_DBG_SESSION(conn->session, "data in with status done "
960 "[sc %p res %d itt 0x%x]\n",
961 sc, sc->result, task->itt);
Mike Christie1d9edf02008-09-24 11:46:09 -0500962 conn->scsirsp_pdus_cnt++;
Mike Christieb3cd5052009-05-13 17:57:49 -0500963 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
Mike Christie1d9edf02008-09-24 11:46:09 -0500964}
965
Mike Christie7ea8b822006-07-24 15:47:22 -0500966static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
967{
968 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
969
970 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
971 conn->tmfrsp_pdus_cnt++;
972
Mike Christie843c0a82007-12-13 12:43:20 -0600973 if (conn->tmf_state != TMF_QUEUED)
Mike Christie7ea8b822006-07-24 15:47:22 -0500974 return;
975
976 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
Mike Christie843c0a82007-12-13 12:43:20 -0600977 conn->tmf_state = TMF_SUCCESS;
Mike Christie7ea8b822006-07-24 15:47:22 -0500978 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
Mike Christie843c0a82007-12-13 12:43:20 -0600979 conn->tmf_state = TMF_NOT_FOUND;
Mike Christie7ea8b822006-07-24 15:47:22 -0500980 else
Mike Christie843c0a82007-12-13 12:43:20 -0600981 conn->tmf_state = TMF_FAILED;
Mike Christie7ea8b822006-07-24 15:47:22 -0500982 wake_up(&conn->ehwait);
983}
984
Ariel Nahum52f56642015-09-03 19:49:55 +0300985static int iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr)
Mike Christief6d51802007-12-13 12:43:30 -0600986{
987 struct iscsi_nopout hdr;
Mike Christie9c19a7d2008-05-21 15:54:09 -0500988 struct iscsi_task *task;
Mike Christief6d51802007-12-13 12:43:30 -0600989
Mike Christie9c19a7d2008-05-21 15:54:09 -0500990 if (!rhdr && conn->ping_task)
Ariel Nahum52f56642015-09-03 19:49:55 +0300991 return -EINVAL;
Mike Christief6d51802007-12-13 12:43:30 -0600992
993 memset(&hdr, 0, sizeof(struct iscsi_nopout));
994 hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE;
995 hdr.flags = ISCSI_FLAG_CMD_FINAL;
996
997 if (rhdr) {
Andy Grover55bdabd2011-06-16 15:57:09 -0700998 hdr.lun = rhdr->lun;
Mike Christief6d51802007-12-13 12:43:30 -0600999 hdr.ttt = rhdr->ttt;
1000 hdr.itt = RESERVED_ITT;
1001 } else
1002 hdr.ttt = RESERVED_ITT;
1003
Mike Christie9c19a7d2008-05-21 15:54:09 -05001004 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0);
Ariel Nahum52f56642015-09-03 19:49:55 +03001005 if (!task) {
Mike Christie322d7392008-01-31 13:36:52 -06001006 iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n");
Ariel Nahum52f56642015-09-03 19:49:55 +03001007 return -EIO;
1008 } else if (!rhdr) {
Mike Christied3acf022008-12-01 12:13:00 -06001009 /* only track our nops */
1010 conn->ping_task = task;
1011 conn->last_ping = jiffies;
1012 }
Ariel Nahum52f56642015-09-03 19:49:55 +03001013
1014 return 0;
Mike Christief6d51802007-12-13 12:43:30 -06001015}
1016
Mike Christie8afa1432009-08-20 15:10:59 -05001017static int iscsi_nop_out_rsp(struct iscsi_task *task,
1018 struct iscsi_nopin *nop, char *data, int datalen)
1019{
1020 struct iscsi_conn *conn = task->conn;
1021 int rc = 0;
1022
1023 if (conn->ping_task != task) {
1024 /*
1025 * If this is not in response to one of our
1026 * nops then it must be from userspace.
1027 */
1028 if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop,
1029 data, datalen))
1030 rc = ISCSI_ERR_CONN_FAILED;
1031 } else
1032 mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout);
1033 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1034 return rc;
1035}
1036
Mike Christie62f38302006-08-31 18:09:27 -04001037static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1038 char *data, int datalen)
1039{
1040 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
1041 struct iscsi_hdr rejected_pdu;
Mike Christie8afa1432009-08-20 15:10:59 -05001042 int opcode, rc = 0;
Mike Christie62f38302006-08-31 18:09:27 -04001043
1044 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
1045
Mike Christie8afa1432009-08-20 15:10:59 -05001046 if (ntoh24(reject->dlength) > datalen ||
1047 ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) {
1048 iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected "
1049 "pdu. Invalid data length (pdu dlength "
1050 "%u, datalen %d\n", ntoh24(reject->dlength),
1051 datalen);
1052 return ISCSI_ERR_PROTO;
Mike Christie62f38302006-08-31 18:09:27 -04001053 }
Mike Christie8afa1432009-08-20 15:10:59 -05001054 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
1055 opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK;
1056
1057 switch (reject->reason) {
1058 case ISCSI_REASON_DATA_DIGEST_ERROR:
1059 iscsi_conn_printk(KERN_ERR, conn,
1060 "pdu (op 0x%x itt 0x%x) rejected "
1061 "due to DataDigest error.\n",
Vaughan Caoe5dbbe22014-01-09 10:21:34 +08001062 opcode, rejected_pdu.itt);
Mike Christie8afa1432009-08-20 15:10:59 -05001063 break;
1064 case ISCSI_REASON_IMM_CMD_REJECT:
1065 iscsi_conn_printk(KERN_ERR, conn,
1066 "pdu (op 0x%x itt 0x%x) rejected. Too many "
1067 "immediate commands.\n",
Vaughan Caoe5dbbe22014-01-09 10:21:34 +08001068 opcode, rejected_pdu.itt);
Mike Christie8afa1432009-08-20 15:10:59 -05001069 /*
1070 * We only send one TMF at a time so if the target could not
1071 * handle it, then it should get fixed (RFC mandates that
1072 * a target can handle one immediate TMF per conn).
1073 *
1074 * For nops-outs, we could have sent more than one if
1075 * the target is sending us lots of nop-ins
1076 */
1077 if (opcode != ISCSI_OP_NOOP_OUT)
1078 return 0;
1079
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001080 if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG)) {
Mike Christie8afa1432009-08-20 15:10:59 -05001081 /*
1082 * nop-out in response to target's nop-out rejected.
1083 * Just resend.
1084 */
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001085 /* In RX path we are under back lock */
1086 spin_unlock(&conn->session->back_lock);
1087 spin_lock(&conn->session->frwd_lock);
Mike Christie8afa1432009-08-20 15:10:59 -05001088 iscsi_send_nopout(conn,
1089 (struct iscsi_nopin*)&rejected_pdu);
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001090 spin_unlock(&conn->session->frwd_lock);
1091 spin_lock(&conn->session->back_lock);
1092 } else {
Mike Christie8afa1432009-08-20 15:10:59 -05001093 struct iscsi_task *task;
1094 /*
1095 * Our nop as ping got dropped. We know the target
1096 * and transport are ok so just clean up
1097 */
1098 task = iscsi_itt_to_task(conn, rejected_pdu.itt);
1099 if (!task) {
1100 iscsi_conn_printk(KERN_ERR, conn,
1101 "Invalid pdu reject. Could "
1102 "not lookup rejected task.\n");
1103 rc = ISCSI_ERR_BAD_ITT;
1104 } else
1105 rc = iscsi_nop_out_rsp(task,
1106 (struct iscsi_nopin*)&rejected_pdu,
1107 NULL, 0);
1108 }
1109 break;
1110 default:
1111 iscsi_conn_printk(KERN_ERR, conn,
1112 "pdu (op 0x%x itt 0x%x) rejected. Reason "
Vaughan Caoe5dbbe22014-01-09 10:21:34 +08001113 "code 0x%x\n", rejected_pdu.opcode,
1114 rejected_pdu.itt, reject->reason);
Mike Christie8afa1432009-08-20 15:10:59 -05001115 break;
1116 }
1117 return rc;
Mike Christie62f38302006-08-31 18:09:27 -04001118}
1119
Mike Christie7996a772006-04-06 21:13:41 -05001120/**
Mike Christie913e5bf2008-05-21 15:54:18 -05001121 * iscsi_itt_to_task - look up task by itt
1122 * @conn: iscsi connection
1123 * @itt: itt
1124 *
1125 * This should be used for mgmt tasks like login and nops, or if
1126 * the LDD's itt space does not include the session age.
1127 *
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001128 * The session back_lock must be held.
Mike Christie913e5bf2008-05-21 15:54:18 -05001129 */
Mike Christie8f9256c2009-05-13 17:57:41 -05001130struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt)
Mike Christie913e5bf2008-05-21 15:54:18 -05001131{
1132 struct iscsi_session *session = conn->session;
Mike Christie262ef632008-12-02 00:32:13 -06001133 int i;
Mike Christie913e5bf2008-05-21 15:54:18 -05001134
1135 if (itt == RESERVED_ITT)
1136 return NULL;
1137
Mike Christie262ef632008-12-02 00:32:13 -06001138 if (session->tt->parse_pdu_itt)
1139 session->tt->parse_pdu_itt(conn, itt, &i, NULL);
1140 else
1141 i = get_itt(itt);
Mike Christie913e5bf2008-05-21 15:54:18 -05001142 if (i >= session->cmds_max)
1143 return NULL;
1144
1145 return session->cmds[i];
1146}
Mike Christie8f9256c2009-05-13 17:57:41 -05001147EXPORT_SYMBOL_GPL(iscsi_itt_to_task);
Mike Christie913e5bf2008-05-21 15:54:18 -05001148
1149/**
Mike Christie7996a772006-04-06 21:13:41 -05001150 * __iscsi_complete_pdu - complete pdu
1151 * @conn: iscsi conn
1152 * @hdr: iscsi header
1153 * @data: data buffer
1154 * @datalen: len of data buffer
1155 *
1156 * Completes pdu processing by freeing any resources allocated at
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001157 * queuecommand or send generic. session back_lock must be held and verify
Mike Christie7996a772006-04-06 21:13:41 -05001158 * itt must have been called.
1159 */
Mike Christie913e5bf2008-05-21 15:54:18 -05001160int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1161 char *data, int datalen)
Mike Christie7996a772006-04-06 21:13:41 -05001162{
1163 struct iscsi_session *session = conn->session;
1164 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
Mike Christie9c19a7d2008-05-21 15:54:09 -05001165 struct iscsi_task *task;
Mike Christie7996a772006-04-06 21:13:41 -05001166 uint32_t itt;
1167
Mike Christief6d51802007-12-13 12:43:30 -06001168 conn->last_recv = jiffies;
Mike Christie0af967f2008-05-21 15:54:04 -05001169 rc = iscsi_verify_itt(conn, hdr->itt);
1170 if (rc)
1171 return rc;
1172
Al Virob4377352007-02-09 16:39:40 +00001173 if (hdr->itt != RESERVED_ITT)
1174 itt = get_itt(hdr->itt);
Mike Christie7996a772006-04-06 21:13:41 -05001175 else
Al Virob4377352007-02-09 16:39:40 +00001176 itt = ~0U;
Mike Christie7996a772006-04-06 21:13:41 -05001177
Mike Christie1b2c7af2009-03-05 14:45:58 -06001178 ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n",
1179 opcode, conn->id, itt, datalen);
Mike Christie7996a772006-04-06 21:13:41 -05001180
Mike Christie3e5c28a2008-05-21 15:54:06 -05001181 if (itt == ~0U) {
Mike Christie77a23c22007-05-30 12:57:18 -05001182 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
Mike Christie62f38302006-08-31 18:09:27 -04001183
Mike Christie7996a772006-04-06 21:13:41 -05001184 switch(opcode) {
1185 case ISCSI_OP_NOOP_IN:
Mike Christie40527af2006-07-24 15:47:45 -05001186 if (datalen) {
Mike Christie7996a772006-04-06 21:13:41 -05001187 rc = ISCSI_ERR_PROTO;
Mike Christie40527af2006-07-24 15:47:45 -05001188 break;
1189 }
1190
Al Virob4377352007-02-09 16:39:40 +00001191 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
Mike Christie40527af2006-07-24 15:47:45 -05001192 break;
1193
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001194 /* In RX path we are under back lock */
1195 spin_unlock(&session->back_lock);
1196 spin_lock(&session->frwd_lock);
Mike Christief6d51802007-12-13 12:43:30 -06001197 iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr);
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001198 spin_unlock(&session->frwd_lock);
1199 spin_lock(&session->back_lock);
Mike Christie7996a772006-04-06 21:13:41 -05001200 break;
1201 case ISCSI_OP_REJECT:
Mike Christie62f38302006-08-31 18:09:27 -04001202 rc = iscsi_handle_reject(conn, hdr, data, datalen);
1203 break;
Mike Christie7996a772006-04-06 21:13:41 -05001204 case ISCSI_OP_ASYNC_EVENT:
Mike Christie8d2860b2006-05-02 19:46:47 -05001205 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
Mike Christie5831c732006-10-16 18:09:41 -04001206 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1207 rc = ISCSI_ERR_CONN_FAILED;
Mike Christie7996a772006-04-06 21:13:41 -05001208 break;
1209 default:
1210 rc = ISCSI_ERR_BAD_OPCODE;
1211 break;
1212 }
Mike Christie3e5c28a2008-05-21 15:54:06 -05001213 goto out;
1214 }
Mike Christie7996a772006-04-06 21:13:41 -05001215
Mike Christie3e5c28a2008-05-21 15:54:06 -05001216 switch(opcode) {
1217 case ISCSI_OP_SCSI_CMD_RSP:
Mike Christie913e5bf2008-05-21 15:54:18 -05001218 case ISCSI_OP_SCSI_DATA_IN:
1219 task = iscsi_itt_to_ctask(conn, hdr->itt);
1220 if (!task)
1221 return ISCSI_ERR_BAD_ITT;
Mike Christied355e572009-06-15 22:11:08 -05001222 task->last_xfer = jiffies;
Mike Christie913e5bf2008-05-21 15:54:18 -05001223 break;
1224 case ISCSI_OP_R2T:
1225 /*
1226 * LLD handles R2Ts if they need to.
1227 */
1228 return 0;
1229 case ISCSI_OP_LOGOUT_RSP:
1230 case ISCSI_OP_LOGIN_RSP:
1231 case ISCSI_OP_TEXT_RSP:
1232 case ISCSI_OP_SCSI_TMFUNC_RSP:
1233 case ISCSI_OP_NOOP_IN:
1234 task = iscsi_itt_to_task(conn, hdr->itt);
1235 if (!task)
1236 return ISCSI_ERR_BAD_ITT;
1237 break;
1238 default:
1239 return ISCSI_ERR_BAD_OPCODE;
1240 }
1241
1242 switch(opcode) {
1243 case ISCSI_OP_SCSI_CMD_RSP:
Mike Christie9c19a7d2008-05-21 15:54:09 -05001244 iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen);
Mike Christie3e5c28a2008-05-21 15:54:06 -05001245 break;
1246 case ISCSI_OP_SCSI_DATA_IN:
Mike Christie1d9edf02008-09-24 11:46:09 -05001247 iscsi_data_in_rsp(conn, hdr, task);
Mike Christie3e5c28a2008-05-21 15:54:06 -05001248 break;
Mike Christie3e5c28a2008-05-21 15:54:06 -05001249 case ISCSI_OP_LOGOUT_RSP:
1250 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1251 if (datalen) {
1252 rc = ISCSI_ERR_PROTO;
1253 break;
1254 }
1255 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1256 goto recv_pdu;
1257 case ISCSI_OP_LOGIN_RSP:
1258 case ISCSI_OP_TEXT_RSP:
1259 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1260 /*
1261 * login related PDU's exp_statsn is handled in
1262 * userspace
1263 */
1264 goto recv_pdu;
1265 case ISCSI_OP_SCSI_TMFUNC_RSP:
1266 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1267 if (datalen) {
1268 rc = ISCSI_ERR_PROTO;
1269 break;
1270 }
1271
1272 iscsi_tmf_rsp(conn, hdr);
Mike Christieb3cd5052009-05-13 17:57:49 -05001273 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
Mike Christie3e5c28a2008-05-21 15:54:06 -05001274 break;
1275 case ISCSI_OP_NOOP_IN:
1276 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1277 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) {
1278 rc = ISCSI_ERR_PROTO;
1279 break;
1280 }
1281 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1282
Mike Christie8afa1432009-08-20 15:10:59 -05001283 rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr,
1284 data, datalen);
Mike Christie3e5c28a2008-05-21 15:54:06 -05001285 break;
1286 default:
1287 rc = ISCSI_ERR_BAD_OPCODE;
1288 break;
1289 }
1290
1291out:
1292 return rc;
1293recv_pdu:
1294 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1295 rc = ISCSI_ERR_CONN_FAILED;
Mike Christieb3cd5052009-05-13 17:57:49 -05001296 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
Mike Christie7996a772006-04-06 21:13:41 -05001297 return rc;
1298}
Mike Christie913e5bf2008-05-21 15:54:18 -05001299EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
Mike Christie7996a772006-04-06 21:13:41 -05001300
1301int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1302 char *data, int datalen)
1303{
1304 int rc;
1305
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001306 spin_lock(&conn->session->back_lock);
Mike Christie7996a772006-04-06 21:13:41 -05001307 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001308 spin_unlock(&conn->session->back_lock);
Mike Christie7996a772006-04-06 21:13:41 -05001309 return rc;
1310}
1311EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
1312
Mike Christie0af967f2008-05-21 15:54:04 -05001313int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt)
Mike Christie7996a772006-04-06 21:13:41 -05001314{
1315 struct iscsi_session *session = conn->session;
Mike Christie262ef632008-12-02 00:32:13 -06001316 int age = 0, i = 0;
Mike Christie7996a772006-04-06 21:13:41 -05001317
Mike Christie0af967f2008-05-21 15:54:04 -05001318 if (itt == RESERVED_ITT)
1319 return 0;
Mike Christie7996a772006-04-06 21:13:41 -05001320
Mike Christie262ef632008-12-02 00:32:13 -06001321 if (session->tt->parse_pdu_itt)
1322 session->tt->parse_pdu_itt(conn, itt, &i, &age);
1323 else {
1324 i = get_itt(itt);
1325 age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK;
1326 }
1327
1328 if (age != session->age) {
Mike Christie0af967f2008-05-21 15:54:04 -05001329 iscsi_conn_printk(KERN_ERR, conn,
1330 "received itt %x expected session age (%x)\n",
Mike Christie913e5bf2008-05-21 15:54:18 -05001331 (__force u32)itt, session->age);
Mike Christie0af967f2008-05-21 15:54:04 -05001332 return ISCSI_ERR_BAD_ITT;
1333 }
Mike Christie7996a772006-04-06 21:13:41 -05001334
Mike Christie3e5c28a2008-05-21 15:54:06 -05001335 if (i >= session->cmds_max) {
1336 iscsi_conn_printk(KERN_ERR, conn,
1337 "received invalid itt index %u (max cmds "
1338 "%u.\n", i, session->cmds_max);
1339 return ISCSI_ERR_BAD_ITT;
Mike Christie7996a772006-04-06 21:13:41 -05001340 }
Mike Christie7996a772006-04-06 21:13:41 -05001341 return 0;
1342}
1343EXPORT_SYMBOL_GPL(iscsi_verify_itt);
1344
Mike Christie913e5bf2008-05-21 15:54:18 -05001345/**
1346 * iscsi_itt_to_ctask - look up ctask by itt
1347 * @conn: iscsi connection
1348 * @itt: itt
1349 *
1350 * This should be used for cmd tasks.
1351 *
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001352 * The session back_lock must be held.
Mike Christie913e5bf2008-05-21 15:54:18 -05001353 */
1354struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt)
Mike Christie0af967f2008-05-21 15:54:04 -05001355{
Mike Christie9c19a7d2008-05-21 15:54:09 -05001356 struct iscsi_task *task;
Mike Christie0af967f2008-05-21 15:54:04 -05001357
1358 if (iscsi_verify_itt(conn, itt))
1359 return NULL;
1360
Mike Christie913e5bf2008-05-21 15:54:18 -05001361 task = iscsi_itt_to_task(conn, itt);
1362 if (!task || !task->sc)
Mike Christie0af967f2008-05-21 15:54:04 -05001363 return NULL;
1364
Mike Christie913e5bf2008-05-21 15:54:18 -05001365 if (task->sc->SCp.phase != conn->session->age) {
1366 iscsi_session_printk(KERN_ERR, conn->session,
1367 "task's session age %d, expected %d\n",
1368 task->sc->SCp.phase, conn->session->age);
Mike Christie0af967f2008-05-21 15:54:04 -05001369 return NULL;
Mike Christie913e5bf2008-05-21 15:54:18 -05001370 }
Mike Christie0af967f2008-05-21 15:54:04 -05001371
Mike Christie9c19a7d2008-05-21 15:54:09 -05001372 return task;
Mike Christie0af967f2008-05-21 15:54:04 -05001373}
1374EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask);
1375
Mike Christie40a06e72009-03-05 14:46:05 -06001376void iscsi_session_failure(struct iscsi_session *session,
Mike Christiee5bd7b52008-09-24 11:46:10 -05001377 enum iscsi_err err)
1378{
Mike Christiee5bd7b52008-09-24 11:46:10 -05001379 struct iscsi_conn *conn;
1380 struct device *dev;
Mike Christiee5bd7b52008-09-24 11:46:10 -05001381
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001382 spin_lock_bh(&session->frwd_lock);
Mike Christiee5bd7b52008-09-24 11:46:10 -05001383 conn = session->leadconn;
1384 if (session->state == ISCSI_STATE_TERMINATE || !conn) {
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001385 spin_unlock_bh(&session->frwd_lock);
Mike Christiee5bd7b52008-09-24 11:46:10 -05001386 return;
1387 }
1388
1389 dev = get_device(&conn->cls_conn->dev);
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001390 spin_unlock_bh(&session->frwd_lock);
Mike Christiee5bd7b52008-09-24 11:46:10 -05001391 if (!dev)
1392 return;
1393 /*
1394 * if the host is being removed bypass the connection
1395 * recovery initialization because we are going to kill
1396 * the session.
1397 */
1398 if (err == ISCSI_ERR_INVALID_HOST)
1399 iscsi_conn_error_event(conn->cls_conn, err);
1400 else
1401 iscsi_conn_failure(conn, err);
1402 put_device(dev);
1403}
1404EXPORT_SYMBOL_GPL(iscsi_session_failure);
1405
Mike Christie7996a772006-04-06 21:13:41 -05001406void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
1407{
1408 struct iscsi_session *session = conn->session;
Mike Christie7996a772006-04-06 21:13:41 -05001409
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001410 spin_lock_bh(&session->frwd_lock);
Mike Christie656cffc2006-05-18 20:31:42 -05001411 if (session->state == ISCSI_STATE_FAILED) {
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001412 spin_unlock_bh(&session->frwd_lock);
Mike Christie656cffc2006-05-18 20:31:42 -05001413 return;
1414 }
1415
Mike Christie67a61112006-05-30 00:37:20 -05001416 if (conn->stop_stage == 0)
Mike Christie7996a772006-04-06 21:13:41 -05001417 session->state = ISCSI_STATE_FAILED;
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001418 spin_unlock_bh(&session->frwd_lock);
Mike Christiee5bd7b52008-09-24 11:46:10 -05001419
Mike Christie7996a772006-04-06 21:13:41 -05001420 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1421 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
Mike Christiee5bd7b52008-09-24 11:46:10 -05001422 iscsi_conn_error_event(conn->cls_conn, err);
Mike Christie7996a772006-04-06 21:13:41 -05001423}
1424EXPORT_SYMBOL_GPL(iscsi_conn_failure);
1425
Mike Christie77a23c22007-05-30 12:57:18 -05001426static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
1427{
1428 struct iscsi_session *session = conn->session;
1429
1430 /*
1431 * Check for iSCSI window and take care of CmdSN wrap-around
1432 */
Mike Christiee0726402007-07-26 12:46:48 -05001433 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
Mike Christie1b2c7af2009-03-05 14:45:58 -06001434 ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn "
1435 "%u MaxCmdSN %u CmdSN %u/%u\n",
1436 session->exp_cmdsn, session->max_cmdsn,
1437 session->cmdsn, session->queued_cmdsn);
Mike Christie77a23c22007-05-30 12:57:18 -05001438 return -ENOSPC;
1439 }
1440 return 0;
1441}
1442
Mike Christie9c19a7d2008-05-21 15:54:09 -05001443static int iscsi_xmit_task(struct iscsi_conn *conn)
Mike Christie77a23c22007-05-30 12:57:18 -05001444{
Mike Christie9c19a7d2008-05-21 15:54:09 -05001445 struct iscsi_task *task = conn->task;
Mike Christie843c0a82007-12-13 12:43:20 -06001446 int rc;
Mike Christie77a23c22007-05-30 12:57:18 -05001447
Mike Christie70b31c12009-08-20 15:11:03 -05001448 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx))
1449 return -ENODATA;
1450
Mike Christie9c19a7d2008-05-21 15:54:09 -05001451 __iscsi_get_task(task);
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001452 spin_unlock_bh(&conn->session->frwd_lock);
Mike Christie9c19a7d2008-05-21 15:54:09 -05001453 rc = conn->session->tt->xmit_task(task);
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001454 spin_lock_bh(&conn->session->frwd_lock);
Mike Christied355e572009-06-15 22:11:08 -05001455 if (!rc) {
Mike Christie9c19a7d2008-05-21 15:54:09 -05001456 /* done with this task */
Mike Christied355e572009-06-15 22:11:08 -05001457 task->last_xfer = jiffies;
Mike Christie9c19a7d2008-05-21 15:54:09 -05001458 conn->task = NULL;
Mike Christied355e572009-06-15 22:11:08 -05001459 }
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001460 /* regular RX path uses back_lock */
Shlomo Pongratz72b974022014-03-30 15:26:29 +03001461 spin_lock(&conn->session->back_lock);
Mike Christied355e572009-06-15 22:11:08 -05001462 __iscsi_put_task(task);
Shlomo Pongratz72b974022014-03-30 15:26:29 +03001463 spin_unlock(&conn->session->back_lock);
Mike Christie77a23c22007-05-30 12:57:18 -05001464 return rc;
1465}
1466
Mike Christie7996a772006-04-06 21:13:41 -05001467/**
Mike Christie9c19a7d2008-05-21 15:54:09 -05001468 * iscsi_requeue_task - requeue task to run from session workqueue
1469 * @task: task to requeue
Mike Christie843c0a82007-12-13 12:43:20 -06001470 *
Mike Christie9c19a7d2008-05-21 15:54:09 -05001471 * LLDs that need to run a task from the session workqueue should call
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001472 * this. The session frwd_lock must be held. This should only be called
Mike Christie052d0142008-05-21 15:54:05 -05001473 * by software drivers.
Mike Christie843c0a82007-12-13 12:43:20 -06001474 */
Mike Christie9c19a7d2008-05-21 15:54:09 -05001475void iscsi_requeue_task(struct iscsi_task *task)
Mike Christie843c0a82007-12-13 12:43:20 -06001476{
Mike Christie9c19a7d2008-05-21 15:54:09 -05001477 struct iscsi_conn *conn = task->conn;
Mike Christie843c0a82007-12-13 12:43:20 -06001478
Mike Christie3bbaaad2009-05-13 17:57:46 -05001479 /*
1480 * this may be on the requeue list already if the xmit_task callout
1481 * is handling the r2ts while we are adding new ones
1482 */
Chris Leechde1ff842017-02-27 16:58:36 -08001483 spin_lock_bh(&conn->taskqueuelock);
Mike Christie3bbaaad2009-05-13 17:57:46 -05001484 if (list_empty(&task->running))
1485 list_add_tail(&task->running, &conn->requeue);
Chris Leechde1ff842017-02-27 16:58:36 -08001486 spin_unlock_bh(&conn->taskqueuelock);
Mike Christie32ae7632009-03-05 14:46:03 -06001487 iscsi_conn_queue_work(conn);
Mike Christie843c0a82007-12-13 12:43:20 -06001488}
Mike Christie9c19a7d2008-05-21 15:54:09 -05001489EXPORT_SYMBOL_GPL(iscsi_requeue_task);
Mike Christie843c0a82007-12-13 12:43:20 -06001490
1491/**
Mike Christie7996a772006-04-06 21:13:41 -05001492 * iscsi_data_xmit - xmit any command into the scheduled connection
1493 * @conn: iscsi connection
1494 *
1495 * Notes:
1496 * The function can return -EAGAIN in which case the caller must
1497 * re-schedule it again later or recover. '0' return code means
1498 * successful xmit.
1499 **/
1500static int iscsi_data_xmit(struct iscsi_conn *conn)
1501{
Mike Christie5d12c052009-11-11 16:34:32 -06001502 struct iscsi_task *task;
Mike Christie3219e522006-05-30 00:37:28 -05001503 int rc = 0;
Mike Christie7996a772006-04-06 21:13:41 -05001504
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001505 spin_lock_bh(&conn->session->frwd_lock);
Mike Christie70b31c12009-08-20 15:11:03 -05001506 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
Mike Christie1b2c7af2009-03-05 14:45:58 -06001507 ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n");
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001508 spin_unlock_bh(&conn->session->frwd_lock);
Mike Christie3219e522006-05-30 00:37:28 -05001509 return -ENODATA;
Mike Christie7996a772006-04-06 21:13:41 -05001510 }
Mike Christie7996a772006-04-06 21:13:41 -05001511
Mike Christie9c19a7d2008-05-21 15:54:09 -05001512 if (conn->task) {
1513 rc = iscsi_xmit_task(conn);
Mike Christie3219e522006-05-30 00:37:28 -05001514 if (rc)
Mike Christie70b31c12009-08-20 15:11:03 -05001515 goto done;
Mike Christie7996a772006-04-06 21:13:41 -05001516 }
1517
Mike Christie77a23c22007-05-30 12:57:18 -05001518 /*
1519 * process mgmt pdus like nops before commands since we should
1520 * only have one nop-out as a ping from us and targets should not
1521 * overflow us with nop-ins
1522 */
Chris Leechde1ff842017-02-27 16:58:36 -08001523 spin_lock_bh(&conn->taskqueuelock);
Mike Christie77a23c22007-05-30 12:57:18 -05001524check_mgmt:
Mike Christie843c0a82007-12-13 12:43:20 -06001525 while (!list_empty(&conn->mgmtqueue)) {
Mike Christie9c19a7d2008-05-21 15:54:09 -05001526 conn->task = list_entry(conn->mgmtqueue.next,
1527 struct iscsi_task, running);
Mike Christie3bbaaad2009-05-13 17:57:46 -05001528 list_del_init(&conn->task->running);
Chris Leechde1ff842017-02-27 16:58:36 -08001529 spin_unlock_bh(&conn->taskqueuelock);
Mike Christie9c19a7d2008-05-21 15:54:09 -05001530 if (iscsi_prep_mgmt_task(conn, conn->task)) {
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001531 /* regular RX path uses back_lock */
1532 spin_lock_bh(&conn->session->back_lock);
Mike Christie9c19a7d2008-05-21 15:54:09 -05001533 __iscsi_put_task(conn->task);
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001534 spin_unlock_bh(&conn->session->back_lock);
Mike Christie9c19a7d2008-05-21 15:54:09 -05001535 conn->task = NULL;
Chris Leechde1ff842017-02-27 16:58:36 -08001536 spin_lock_bh(&conn->taskqueuelock);
Mike Christieb3a7ea82007-12-13 12:43:26 -06001537 continue;
1538 }
Mike Christie9c19a7d2008-05-21 15:54:09 -05001539 rc = iscsi_xmit_task(conn);
Mike Christie77a23c22007-05-30 12:57:18 -05001540 if (rc)
Mike Christie70b31c12009-08-20 15:11:03 -05001541 goto done;
Chris Leechde1ff842017-02-27 16:58:36 -08001542 spin_lock_bh(&conn->taskqueuelock);
Mike Christie7996a772006-04-06 21:13:41 -05001543 }
1544
Mike Christie843c0a82007-12-13 12:43:20 -06001545 /* process pending command queue */
Mike Christie3bbaaad2009-05-13 17:57:46 -05001546 while (!list_empty(&conn->cmdqueue)) {
Mike Christie5d12c052009-11-11 16:34:32 -06001547 conn->task = list_entry(conn->cmdqueue.next, struct iscsi_task,
1548 running);
Mike Christie3bbaaad2009-05-13 17:57:46 -05001549 list_del_init(&conn->task->running);
Chris Leechde1ff842017-02-27 16:58:36 -08001550 spin_unlock_bh(&conn->taskqueuelock);
Mike Christieb3a7ea82007-12-13 12:43:26 -06001551 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
Mike Christieb3cd5052009-05-13 17:57:49 -05001552 fail_scsi_task(conn->task, DID_IMM_RETRY);
Chris Leechde1ff842017-02-27 16:58:36 -08001553 spin_lock_bh(&conn->taskqueuelock);
Mike Christieb3a7ea82007-12-13 12:43:26 -06001554 continue;
1555 }
Mike Christie577577d2008-12-02 00:32:05 -06001556 rc = iscsi_prep_scsi_cmd_pdu(conn->task);
1557 if (rc) {
Mike Christie5d12c052009-11-11 16:34:32 -06001558 if (rc == -ENOMEM || rc == -EACCES) {
Chris Leechde1ff842017-02-27 16:58:36 -08001559 spin_lock_bh(&conn->taskqueuelock);
Mike Christie3bbaaad2009-05-13 17:57:46 -05001560 list_add_tail(&conn->task->running,
1561 &conn->cmdqueue);
Mike Christie577577d2008-12-02 00:32:05 -06001562 conn->task = NULL;
Chris Leechde1ff842017-02-27 16:58:36 -08001563 spin_unlock_bh(&conn->taskqueuelock);
Mike Christie70b31c12009-08-20 15:11:03 -05001564 goto done;
Mike Christie577577d2008-12-02 00:32:05 -06001565 } else
Mike Christieb3cd5052009-05-13 17:57:49 -05001566 fail_scsi_task(conn->task, DID_ABORT);
Chris Leechde1ff842017-02-27 16:58:36 -08001567 spin_lock_bh(&conn->taskqueuelock);
Boaz Harrosh004d6532007-12-13 12:43:23 -06001568 continue;
1569 }
Mike Christie9c19a7d2008-05-21 15:54:09 -05001570 rc = iscsi_xmit_task(conn);
Mike Christie77a23c22007-05-30 12:57:18 -05001571 if (rc)
Mike Christie70b31c12009-08-20 15:11:03 -05001572 goto done;
Mike Christie77a23c22007-05-30 12:57:18 -05001573 /*
Mike Christie9c19a7d2008-05-21 15:54:09 -05001574 * we could continuously get new task requests so
Mike Christie77a23c22007-05-30 12:57:18 -05001575 * we need to check the mgmt queue for nops that need to
1576 * be sent to aviod starvation
1577 */
Chris Leechde1ff842017-02-27 16:58:36 -08001578 spin_lock_bh(&conn->taskqueuelock);
Mike Christie843c0a82007-12-13 12:43:20 -06001579 if (!list_empty(&conn->mgmtqueue))
1580 goto check_mgmt;
1581 }
1582
1583 while (!list_empty(&conn->requeue)) {
Mike Christieb3a7ea82007-12-13 12:43:26 -06001584 /*
1585 * we always do fastlogout - conn stop code will clean up.
1586 */
1587 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
1588 break;
1589
Mike Christie5d12c052009-11-11 16:34:32 -06001590 task = list_entry(conn->requeue.next, struct iscsi_task,
1591 running);
1592 if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT))
1593 break;
1594
1595 conn->task = task;
Mike Christie3bbaaad2009-05-13 17:57:46 -05001596 list_del_init(&conn->task->running);
Mike Christie9c19a7d2008-05-21 15:54:09 -05001597 conn->task->state = ISCSI_TASK_RUNNING;
Chris Leechde1ff842017-02-27 16:58:36 -08001598 spin_unlock_bh(&conn->taskqueuelock);
Mike Christie9c19a7d2008-05-21 15:54:09 -05001599 rc = iscsi_xmit_task(conn);
Mike Christie843c0a82007-12-13 12:43:20 -06001600 if (rc)
Mike Christie70b31c12009-08-20 15:11:03 -05001601 goto done;
Chris Leechde1ff842017-02-27 16:58:36 -08001602 spin_lock_bh(&conn->taskqueuelock);
Mike Christie843c0a82007-12-13 12:43:20 -06001603 if (!list_empty(&conn->mgmtqueue))
Mike Christie77a23c22007-05-30 12:57:18 -05001604 goto check_mgmt;
Mike Christie7996a772006-04-06 21:13:41 -05001605 }
Chris Leechde1ff842017-02-27 16:58:36 -08001606 spin_unlock_bh(&conn->taskqueuelock);
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001607 spin_unlock_bh(&conn->session->frwd_lock);
Mike Christie3219e522006-05-30 00:37:28 -05001608 return -ENODATA;
Mike Christie7996a772006-04-06 21:13:41 -05001609
Mike Christie70b31c12009-08-20 15:11:03 -05001610done:
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001611 spin_unlock_bh(&conn->session->frwd_lock);
Mike Christie3219e522006-05-30 00:37:28 -05001612 return rc;
Mike Christie7996a772006-04-06 21:13:41 -05001613}
1614
David Howellsc4028952006-11-22 14:57:56 +00001615static void iscsi_xmitworker(struct work_struct *work)
Mike Christie7996a772006-04-06 21:13:41 -05001616{
David Howellsc4028952006-11-22 14:57:56 +00001617 struct iscsi_conn *conn =
1618 container_of(work, struct iscsi_conn, xmitwork);
Mike Christie3219e522006-05-30 00:37:28 -05001619 int rc;
Mike Christie7996a772006-04-06 21:13:41 -05001620 /*
1621 * serialize Xmit worker on a per-connection basis.
1622 */
Mike Christie3219e522006-05-30 00:37:28 -05001623 do {
1624 rc = iscsi_data_xmit(conn);
1625 } while (rc >= 0 || rc == -EAGAIN);
Mike Christie7996a772006-04-06 21:13:41 -05001626}
1627
Mike Christie577577d2008-12-02 00:32:05 -06001628static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn,
1629 struct scsi_cmnd *sc)
1630{
1631 struct iscsi_task *task;
1632
Stefani Seibold7acd72e2009-12-21 14:37:28 -08001633 if (!kfifo_out(&conn->session->cmdpool.queue,
Mike Christie577577d2008-12-02 00:32:05 -06001634 (void *) &task, sizeof(void *)))
1635 return NULL;
1636
1637 sc->SCp.phase = conn->session->age;
1638 sc->SCp.ptr = (char *) task;
1639
1640 atomic_set(&task->refcount, 1);
1641 task->state = ISCSI_TASK_PENDING;
1642 task->conn = conn;
1643 task->sc = sc;
Mike Christied355e572009-06-15 22:11:08 -05001644 task->have_checked_conn = false;
1645 task->last_timeout = jiffies;
1646 task->last_xfer = jiffies;
Sagi Grimberg55e51ed2014-03-05 19:43:49 +02001647 task->protected = false;
Mike Christie577577d2008-12-02 00:32:05 -06001648 INIT_LIST_HEAD(&task->running);
1649 return task;
1650}
1651
Mike Christie7996a772006-04-06 21:13:41 -05001652enum {
1653 FAILURE_BAD_HOST = 1,
1654 FAILURE_SESSION_FAILED,
1655 FAILURE_SESSION_FREED,
1656 FAILURE_WINDOW_CLOSED,
Mike Christie60ecebf2006-08-31 18:09:25 -04001657 FAILURE_OOM,
Mike Christie7996a772006-04-06 21:13:41 -05001658 FAILURE_SESSION_TERMINATE,
Mike Christie656cffc2006-05-18 20:31:42 -05001659 FAILURE_SESSION_IN_RECOVERY,
Mike Christie7996a772006-04-06 21:13:41 -05001660 FAILURE_SESSION_RECOVERY_TIMEOUT,
Mike Christieb3a7ea82007-12-13 12:43:26 -06001661 FAILURE_SESSION_LOGGING_OUT,
Mike Christie6eabafb2008-01-31 13:36:43 -06001662 FAILURE_SESSION_NOT_READY,
Mike Christie7996a772006-04-06 21:13:41 -05001663};
1664
Mike Christief41d4722010-12-31 02:22:21 -06001665int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc)
Mike Christie7996a772006-04-06 21:13:41 -05001666{
Mike Christie75613522008-05-21 15:53:59 -05001667 struct iscsi_cls_session *cls_session;
Mike Christie1336aed2009-05-13 17:57:48 -05001668 struct iscsi_host *ihost;
Mike Christie7996a772006-04-06 21:13:41 -05001669 int reason = 0;
1670 struct iscsi_session *session;
1671 struct iscsi_conn *conn;
Mike Christie9c19a7d2008-05-21 15:54:09 -05001672 struct iscsi_task *task = NULL;
Mike Christie7996a772006-04-06 21:13:41 -05001673
Mike Christie7996a772006-04-06 21:13:41 -05001674 sc->result = 0;
Mike Christief47f2cf2006-08-31 18:09:33 -04001675 sc->SCp.ptr = NULL;
Mike Christie7996a772006-04-06 21:13:41 -05001676
Mike Christie1336aed2009-05-13 17:57:48 -05001677 ihost = shost_priv(host);
Mike Christie7996a772006-04-06 21:13:41 -05001678
Mike Christie75613522008-05-21 15:53:59 -05001679 cls_session = starget_to_session(scsi_target(sc->device));
1680 session = cls_session->dd_data;
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001681 spin_lock_bh(&session->frwd_lock);
Mike Christie7996a772006-04-06 21:13:41 -05001682
Mike Christie75613522008-05-21 15:53:59 -05001683 reason = iscsi_session_chkready(cls_session);
Mike Christie6eabafb2008-01-31 13:36:43 -06001684 if (reason) {
1685 sc->result = reason;
1686 goto fault;
1687 }
1688
Mike Christie301e0f72009-05-13 17:57:47 -05001689 if (session->state != ISCSI_STATE_LOGGED_IN) {
Mike Christie656cffc2006-05-18 20:31:42 -05001690 /*
1691 * to handle the race between when we set the recovery state
1692 * and block the session we requeue here (commands could
1693 * be entering our queuecommand while a block is starting
1694 * up because the block code is not locked)
1695 */
Mike Christie9000bcd2007-12-13 12:43:32 -06001696 switch (session->state) {
Mike Christie301e0f72009-05-13 17:57:47 -05001697 case ISCSI_STATE_FAILED:
Rafael David Tinocoa8cfc6d2017-12-07 19:59:13 -02001698 /*
1699 * cmds should fail during shutdown, if the session
1700 * state is bad, allowing completion to happen
1701 */
1702 if (unlikely(system_state != SYSTEM_RUNNING)) {
1703 reason = FAILURE_SESSION_FAILED;
1704 sc->result = DID_NO_CONNECT << 16;
1705 break;
1706 }
Mike Christie9000bcd2007-12-13 12:43:32 -06001707 case ISCSI_STATE_IN_RECOVERY:
Mike Christie656cffc2006-05-18 20:31:42 -05001708 reason = FAILURE_SESSION_IN_RECOVERY;
Mike Christie301e0f72009-05-13 17:57:47 -05001709 sc->result = DID_IMM_RETRY << 16;
1710 break;
Mike Christie9000bcd2007-12-13 12:43:32 -06001711 case ISCSI_STATE_LOGGING_OUT:
1712 reason = FAILURE_SESSION_LOGGING_OUT;
Mike Christie301e0f72009-05-13 17:57:47 -05001713 sc->result = DID_IMM_RETRY << 16;
1714 break;
Mike Christieb3a7ea82007-12-13 12:43:26 -06001715 case ISCSI_STATE_RECOVERY_FAILED:
Mike Christie656cffc2006-05-18 20:31:42 -05001716 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
Mike Christie56d7fcf2008-08-19 18:45:26 -05001717 sc->result = DID_TRANSPORT_FAILFAST << 16;
Mike Christieb3a7ea82007-12-13 12:43:26 -06001718 break;
1719 case ISCSI_STATE_TERMINATE:
Mike Christie656cffc2006-05-18 20:31:42 -05001720 reason = FAILURE_SESSION_TERMINATE;
Mike Christie6eabafb2008-01-31 13:36:43 -06001721 sc->result = DID_NO_CONNECT << 16;
Mike Christieb3a7ea82007-12-13 12:43:26 -06001722 break;
Mike Christieb3a7ea82007-12-13 12:43:26 -06001723 default:
Mike Christie656cffc2006-05-18 20:31:42 -05001724 reason = FAILURE_SESSION_FREED;
Mike Christie6eabafb2008-01-31 13:36:43 -06001725 sc->result = DID_NO_CONNECT << 16;
Mike Christieb3a7ea82007-12-13 12:43:26 -06001726 }
Mike Christie7996a772006-04-06 21:13:41 -05001727 goto fault;
1728 }
1729
Mike Christie7996a772006-04-06 21:13:41 -05001730 conn = session->leadconn;
Mike Christie98644042006-10-16 18:09:39 -04001731 if (!conn) {
1732 reason = FAILURE_SESSION_FREED;
Mike Christie6eabafb2008-01-31 13:36:43 -06001733 sc->result = DID_NO_CONNECT << 16;
Mike Christie98644042006-10-16 18:09:39 -04001734 goto fault;
1735 }
Mike Christie7996a772006-04-06 21:13:41 -05001736
Mike Christie661134a2009-09-05 07:35:33 +05301737 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1738 reason = FAILURE_SESSION_IN_RECOVERY;
Johannes Thumshirnc41bb022017-10-09 13:33:19 +02001739 sc->result = DID_REQUEUE << 16;
Mike Christie661134a2009-09-05 07:35:33 +05301740 goto fault;
1741 }
1742
Mike Christie77a23c22007-05-30 12:57:18 -05001743 if (iscsi_check_cmdsn_window_closed(conn)) {
1744 reason = FAILURE_WINDOW_CLOSED;
1745 goto reject;
1746 }
1747
Mike Christie577577d2008-12-02 00:32:05 -06001748 task = iscsi_alloc_task(conn, sc);
1749 if (!task) {
Mike Christie60ecebf2006-08-31 18:09:25 -04001750 reason = FAILURE_OOM;
1751 goto reject;
1752 }
Mike Christie7996a772006-04-06 21:13:41 -05001753
Mike Christie1336aed2009-05-13 17:57:48 -05001754 if (!ihost->workq) {
Mike Christie577577d2008-12-02 00:32:05 -06001755 reason = iscsi_prep_scsi_cmd_pdu(task);
1756 if (reason) {
Mike Christie5d12c052009-11-11 16:34:32 -06001757 if (reason == -ENOMEM || reason == -EACCES) {
Mike Christie577577d2008-12-02 00:32:05 -06001758 reason = FAILURE_OOM;
1759 goto prepd_reject;
1760 } else {
1761 sc->result = DID_ABORT << 16;
1762 goto prepd_fault;
1763 }
Mike Christie052d0142008-05-21 15:54:05 -05001764 }
Mike Christie9c19a7d2008-05-21 15:54:09 -05001765 if (session->tt->xmit_task(task)) {
Mike Christied3305f32009-08-20 15:10:58 -05001766 session->cmdsn--;
Mike Christie052d0142008-05-21 15:54:05 -05001767 reason = FAILURE_SESSION_NOT_READY;
Mike Christie577577d2008-12-02 00:32:05 -06001768 goto prepd_reject;
Mike Christie052d0142008-05-21 15:54:05 -05001769 }
Mike Christie3bbaaad2009-05-13 17:57:46 -05001770 } else {
Chris Leechde1ff842017-02-27 16:58:36 -08001771 spin_lock_bh(&conn->taskqueuelock);
Mike Christie3bbaaad2009-05-13 17:57:46 -05001772 list_add_tail(&task->running, &conn->cmdqueue);
Chris Leechde1ff842017-02-27 16:58:36 -08001773 spin_unlock_bh(&conn->taskqueuelock);
Mike Christie32ae7632009-03-05 14:46:03 -06001774 iscsi_conn_queue_work(conn);
Mike Christie3bbaaad2009-05-13 17:57:46 -05001775 }
Mike Christie052d0142008-05-21 15:54:05 -05001776
1777 session->queued_cmdsn++;
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001778 spin_unlock_bh(&session->frwd_lock);
Mike Christie7996a772006-04-06 21:13:41 -05001779 return 0;
1780
Mike Christie577577d2008-12-02 00:32:05 -06001781prepd_reject:
Mike Christief41d4722010-12-31 02:22:21 -06001782 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
Mike Christie7996a772006-04-06 21:13:41 -05001783reject:
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001784 spin_unlock_bh(&session->frwd_lock);
Mike Christie1b2c7af2009-03-05 14:45:58 -06001785 ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n",
1786 sc->cmnd[0], reason);
Mike Christied6d13ee2008-08-17 15:24:43 -05001787 return SCSI_MLQUEUE_TARGET_BUSY;
Mike Christie7996a772006-04-06 21:13:41 -05001788
Mike Christie577577d2008-12-02 00:32:05 -06001789prepd_fault:
Mike Christief41d4722010-12-31 02:22:21 -06001790 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
Mike Christie7996a772006-04-06 21:13:41 -05001791fault:
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001792 spin_unlock_bh(&session->frwd_lock);
Mike Christie1b2c7af2009-03-05 14:45:58 -06001793 ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n",
1794 sc->cmnd[0], reason);
Boaz Harroshc07d4442008-04-18 10:11:52 -05001795 if (!scsi_bidi_cmnd(sc))
1796 scsi_set_resid(sc, scsi_bufflen(sc));
1797 else {
1798 scsi_out(sc)->resid = scsi_out(sc)->length;
1799 scsi_in(sc)->resid = scsi_in(sc)->length;
1800 }
Mike Christief41d4722010-12-31 02:22:21 -06001801 sc->scsi_done(sc);
Mike Christie7996a772006-04-06 21:13:41 -05001802 return 0;
1803}
1804EXPORT_SYMBOL_GPL(iscsi_queuecommand);
1805
Mike Christie6b5d6c42009-04-21 15:32:32 -05001806int iscsi_target_alloc(struct scsi_target *starget)
1807{
1808 struct iscsi_cls_session *cls_session = starget_to_session(starget);
1809 struct iscsi_session *session = cls_session->dd_data;
1810
1811 starget->can_queue = session->scsi_cmds_max;
1812 return 0;
1813}
1814EXPORT_SYMBOL_GPL(iscsi_target_alloc);
1815
Mike Christie843c0a82007-12-13 12:43:20 -06001816static void iscsi_tmf_timedout(unsigned long data)
Mike Christie7996a772006-04-06 21:13:41 -05001817{
Mike Christie843c0a82007-12-13 12:43:20 -06001818 struct iscsi_conn *conn = (struct iscsi_conn *)data;
Mike Christie7996a772006-04-06 21:13:41 -05001819 struct iscsi_session *session = conn->session;
1820
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001821 spin_lock(&session->frwd_lock);
Mike Christie843c0a82007-12-13 12:43:20 -06001822 if (conn->tmf_state == TMF_QUEUED) {
1823 conn->tmf_state = TMF_TIMEDOUT;
Erez Zilberbd2199d2009-06-15 22:11:10 -05001824 ISCSI_DBG_EH(session, "tmf timedout\n");
Mike Christie7996a772006-04-06 21:13:41 -05001825 /* unblock eh_abort() */
1826 wake_up(&conn->ehwait);
1827 }
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001828 spin_unlock(&session->frwd_lock);
Mike Christie7996a772006-04-06 21:13:41 -05001829}
1830
Mike Christie9c19a7d2008-05-21 15:54:09 -05001831static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
Mike Christief6d51802007-12-13 12:43:30 -06001832 struct iscsi_tm *hdr, int age,
1833 int timeout)
Mike Christie7996a772006-04-06 21:13:41 -05001834{
Mike Christie7996a772006-04-06 21:13:41 -05001835 struct iscsi_session *session = conn->session;
Mike Christie9c19a7d2008-05-21 15:54:09 -05001836 struct iscsi_task *task;
Mike Christie7996a772006-04-06 21:13:41 -05001837
Mike Christie9c19a7d2008-05-21 15:54:09 -05001838 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
Mike Christie843c0a82007-12-13 12:43:20 -06001839 NULL, 0);
Mike Christie9c19a7d2008-05-21 15:54:09 -05001840 if (!task) {
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001841 spin_unlock_bh(&session->frwd_lock);
Mike Christiedf4da5c2010-12-31 02:22:18 -06001842 iscsi_conn_printk(KERN_ERR, conn, "Could not send TMF.\n");
Mike Christie7996a772006-04-06 21:13:41 -05001843 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001844 spin_lock_bh(&session->frwd_lock);
Mike Christie77a23c22007-05-30 12:57:18 -05001845 return -EPERM;
Mike Christie7996a772006-04-06 21:13:41 -05001846 }
Mike Christie843c0a82007-12-13 12:43:20 -06001847 conn->tmfcmd_pdus_cnt++;
Mike Christief6d51802007-12-13 12:43:30 -06001848 conn->tmf_timer.expires = timeout * HZ + jiffies;
Mike Christie843c0a82007-12-13 12:43:20 -06001849 conn->tmf_timer.function = iscsi_tmf_timedout;
1850 conn->tmf_timer.data = (unsigned long)conn;
1851 add_timer(&conn->tmf_timer);
Erez Zilberbd2199d2009-06-15 22:11:10 -05001852 ISCSI_DBG_EH(session, "tmf set timeout\n");
Mike Christie7996a772006-04-06 21:13:41 -05001853
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001854 spin_unlock_bh(&session->frwd_lock);
Mike Christie6724add2007-08-15 01:38:30 -05001855 mutex_unlock(&session->eh_mutex);
Mike Christie7996a772006-04-06 21:13:41 -05001856
1857 /*
1858 * block eh thread until:
1859 *
Mike Christie843c0a82007-12-13 12:43:20 -06001860 * 1) tmf response
1861 * 2) tmf timeout
Mike Christie7996a772006-04-06 21:13:41 -05001862 * 3) session is terminated or restarted or userspace has
1863 * given up on recovery
1864 */
Mike Christie843c0a82007-12-13 12:43:20 -06001865 wait_event_interruptible(conn->ehwait, age != session->age ||
Mike Christie7996a772006-04-06 21:13:41 -05001866 session->state != ISCSI_STATE_LOGGED_IN ||
Mike Christie843c0a82007-12-13 12:43:20 -06001867 conn->tmf_state != TMF_QUEUED);
Mike Christie7996a772006-04-06 21:13:41 -05001868 if (signal_pending(current))
1869 flush_signals(current);
Mike Christie843c0a82007-12-13 12:43:20 -06001870 del_timer_sync(&conn->tmf_timer);
1871
Mike Christie6724add2007-08-15 01:38:30 -05001872 mutex_lock(&session->eh_mutex);
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001873 spin_lock_bh(&session->frwd_lock);
Mike Christie9c19a7d2008-05-21 15:54:09 -05001874 /* if the session drops it will clean up the task */
Mike Christie843c0a82007-12-13 12:43:20 -06001875 if (age != session->age ||
1876 session->state != ISCSI_STATE_LOGGED_IN)
1877 return -ENOTCONN;
Mike Christie7996a772006-04-06 21:13:41 -05001878 return 0;
1879}
1880
1881/*
Mike Christie843c0a82007-12-13 12:43:20 -06001882 * Fail commands. session lock held and recv side suspended and xmit
1883 * thread flushed
1884 */
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001885static void fail_scsi_tasks(struct iscsi_conn *conn, u64 lun, int error)
Mike Christie843c0a82007-12-13 12:43:20 -06001886{
Mike Christie3bbaaad2009-05-13 17:57:46 -05001887 struct iscsi_task *task;
1888 int i;
Mike Christie843c0a82007-12-13 12:43:20 -06001889
Mike Christie3bbaaad2009-05-13 17:57:46 -05001890 for (i = 0; i < conn->session->cmds_max; i++) {
1891 task = conn->session->cmds[i];
1892 if (!task->sc || task->state == ISCSI_TASK_FREE)
1893 continue;
Mike Christie843c0a82007-12-13 12:43:20 -06001894
Mike Christie3bbaaad2009-05-13 17:57:46 -05001895 if (lun != -1 && lun != task->sc->device->lun)
1896 continue;
Mike Christie843c0a82007-12-13 12:43:20 -06001897
Mike Christie3bbaaad2009-05-13 17:57:46 -05001898 ISCSI_DBG_SESSION(conn->session,
1899 "failing sc %p itt 0x%x state %d\n",
1900 task->sc, task->itt, task->state);
Mike Christieb3cd5052009-05-13 17:57:49 -05001901 fail_scsi_task(task, error);
Mike Christie843c0a82007-12-13 12:43:20 -06001902 }
1903}
1904
Mike Christie661134a2009-09-05 07:35:33 +05301905/**
1906 * iscsi_suspend_queue - suspend iscsi_queuecommand
1907 * @conn: iscsi conn to stop queueing IO on
1908 *
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001909 * This grabs the session frwd_lock to make sure no one is in
Mike Christie661134a2009-09-05 07:35:33 +05301910 * xmit_task/queuecommand, and then sets suspend to prevent
1911 * new commands from being queued. This only needs to be called
1912 * by offload drivers that need to sync a path like ep disconnect
1913 * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi
1914 * will call iscsi_start_tx and iscsi_unblock_session when in FFP.
1915 */
1916void iscsi_suspend_queue(struct iscsi_conn *conn)
1917{
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001918 spin_lock_bh(&conn->session->frwd_lock);
Mike Christie661134a2009-09-05 07:35:33 +05301919 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001920 spin_unlock_bh(&conn->session->frwd_lock);
Mike Christie661134a2009-09-05 07:35:33 +05301921}
1922EXPORT_SYMBOL_GPL(iscsi_suspend_queue);
1923
1924/**
1925 * iscsi_suspend_tx - suspend iscsi_data_xmit
1926 * @conn: iscsi conn tp stop processing IO on.
1927 *
1928 * This function sets the suspend bit to prevent iscsi_data_xmit
1929 * from sending new IO, and if work is queued on the xmit thread
1930 * it will wait for it to be completed.
1931 */
Mike Christieb40977d2008-05-21 15:54:03 -05001932void iscsi_suspend_tx(struct iscsi_conn *conn)
Mike Christie6724add2007-08-15 01:38:30 -05001933{
Mike Christie32ae7632009-03-05 14:46:03 -06001934 struct Scsi_Host *shost = conn->session->host;
1935 struct iscsi_host *ihost = shost_priv(shost);
1936
Mike Christie6724add2007-08-15 01:38:30 -05001937 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
Mike Christie1336aed2009-05-13 17:57:48 -05001938 if (ihost->workq)
Mike Christie32ae7632009-03-05 14:46:03 -06001939 flush_workqueue(ihost->workq);
Mike Christie6724add2007-08-15 01:38:30 -05001940}
Mike Christieb40977d2008-05-21 15:54:03 -05001941EXPORT_SYMBOL_GPL(iscsi_suspend_tx);
Mike Christie6724add2007-08-15 01:38:30 -05001942
1943static void iscsi_start_tx(struct iscsi_conn *conn)
1944{
1945 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
Mike Christie1336aed2009-05-13 17:57:48 -05001946 iscsi_conn_queue_work(conn);
Mike Christie6724add2007-08-15 01:38:30 -05001947}
1948
Mike Christie4c48a822009-05-13 17:57:45 -05001949/*
1950 * We want to make sure a ping is in flight. It has timed out.
1951 * And we are not busy processing a pdu that is making
1952 * progress but got started before the ping and is taking a while
1953 * to complete so the ping is just stuck behind it in a queue.
1954 */
1955static int iscsi_has_ping_timed_out(struct iscsi_conn *conn)
1956{
1957 if (conn->ping_task &&
1958 time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
1959 (conn->ping_timeout * HZ), jiffies))
1960 return 1;
1961 else
1962 return 0;
1963}
1964
Mike Christied355e572009-06-15 22:11:08 -05001965static enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc)
Mike Christief6d51802007-12-13 12:43:30 -06001966{
Mike Christied355e572009-06-15 22:11:08 -05001967 enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED;
Mike Christie92ed4d62010-02-10 16:51:45 -06001968 struct iscsi_task *task = NULL, *running_task;
Mike Christief6d51802007-12-13 12:43:30 -06001969 struct iscsi_cls_session *cls_session;
1970 struct iscsi_session *session;
1971 struct iscsi_conn *conn;
Mike Christie92ed4d62010-02-10 16:51:45 -06001972 int i;
Mike Christief6d51802007-12-13 12:43:30 -06001973
Mike Christied355e572009-06-15 22:11:08 -05001974 cls_session = starget_to_session(scsi_target(sc->device));
Mike Christie75613522008-05-21 15:53:59 -05001975 session = cls_session->dd_data;
Mike Christief6d51802007-12-13 12:43:30 -06001976
Erez Zilberbd2199d2009-06-15 22:11:10 -05001977 ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc);
Mike Christief6d51802007-12-13 12:43:30 -06001978
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001979 spin_lock(&session->frwd_lock);
Mike Christiee3d338a2012-01-26 21:13:11 -06001980 task = (struct iscsi_task *)sc->SCp.ptr;
1981 if (!task) {
1982 /*
1983 * Raced with completion. Blk layer has taken ownership
1984 * so let timeout code complete it now.
1985 */
1986 rc = BLK_EH_HANDLED;
1987 goto done;
1988 }
1989
Mike Christief6d51802007-12-13 12:43:30 -06001990 if (session->state != ISCSI_STATE_LOGGED_IN) {
1991 /*
Rafael David Tinocoa8cfc6d2017-12-07 19:59:13 -02001992 * During shutdown, if session is prematurely disconnected,
1993 * recovery won't happen and there will be hung cmds. Not
1994 * handling cmds would trigger EH, also bad in this case.
1995 * Instead, handle cmd, allow completion to happen and let
1996 * upper layer to deal with the result.
1997 */
1998 if (unlikely(system_state != SYSTEM_RUNNING)) {
1999 sc->result = DID_NO_CONNECT << 16;
2000 ISCSI_DBG_EH(session, "sc on shutdown, handled\n");
2001 rc = BLK_EH_HANDLED;
2002 goto done;
2003 }
2004 /*
Mike Christief6d51802007-12-13 12:43:30 -06002005 * We are probably in the middle of iscsi recovery so let
2006 * that complete and handle the error.
2007 */
Jens Axboe242f9dc2008-09-14 05:55:09 -07002008 rc = BLK_EH_RESET_TIMER;
Mike Christief6d51802007-12-13 12:43:30 -06002009 goto done;
2010 }
2011
2012 conn = session->leadconn;
2013 if (!conn) {
2014 /* In the middle of shuting down */
Jens Axboe242f9dc2008-09-14 05:55:09 -07002015 rc = BLK_EH_RESET_TIMER;
Mike Christief6d51802007-12-13 12:43:30 -06002016 goto done;
2017 }
2018
Mike Christied355e572009-06-15 22:11:08 -05002019 /*
2020 * If we have sent (at least queued to the network layer) a pdu or
2021 * recvd one for the task since the last timeout ask for
2022 * more time. If on the next timeout we have not made progress
2023 * we can check if it is the task or connection when we send the
2024 * nop as a ping.
2025 */
Mike Christie92ed4d62010-02-10 16:51:45 -06002026 if (time_after(task->last_xfer, task->last_timeout)) {
Erez Zilberbd2199d2009-06-15 22:11:10 -05002027 ISCSI_DBG_EH(session, "Command making progress. Asking "
2028 "scsi-ml for more time to complete. "
Mike Christie92ed4d62010-02-10 16:51:45 -06002029 "Last data xfer at %lu. Last timeout was at "
Erez Zilberbd2199d2009-06-15 22:11:10 -05002030 "%lu\n.", task->last_xfer, task->last_timeout);
Mike Christied355e572009-06-15 22:11:08 -05002031 task->have_checked_conn = false;
2032 rc = BLK_EH_RESET_TIMER;
2033 goto done;
2034 }
2035
Mike Christief6d51802007-12-13 12:43:30 -06002036 if (!conn->recv_timeout && !conn->ping_timeout)
2037 goto done;
2038 /*
2039 * if the ping timedout then we are in the middle of cleaning up
2040 * and can let the iscsi eh handle it
2041 */
Mike Christie4c48a822009-05-13 17:57:45 -05002042 if (iscsi_has_ping_timed_out(conn)) {
Jens Axboe242f9dc2008-09-14 05:55:09 -07002043 rc = BLK_EH_RESET_TIMER;
Mike Christie4c48a822009-05-13 17:57:45 -05002044 goto done;
2045 }
Mike Christied355e572009-06-15 22:11:08 -05002046
Mike Christie92ed4d62010-02-10 16:51:45 -06002047 for (i = 0; i < conn->session->cmds_max; i++) {
2048 running_task = conn->session->cmds[i];
2049 if (!running_task->sc || running_task == task ||
2050 running_task->state != ISCSI_TASK_RUNNING)
2051 continue;
2052
2053 /*
2054 * Only check if cmds started before this one have made
2055 * progress, or this could never fail
2056 */
2057 if (time_after(running_task->sc->jiffies_at_alloc,
2058 task->sc->jiffies_at_alloc))
2059 continue;
2060
2061 if (time_after(running_task->last_xfer, task->last_timeout)) {
2062 /*
2063 * This task has not made progress, but a task
2064 * started before us has transferred data since
2065 * we started/last-checked. We could be queueing
2066 * too many tasks or the LU is bad.
2067 *
2068 * If the device is bad the cmds ahead of us on
2069 * other devs will complete, and this loop will
2070 * eventually fail starting the scsi eh.
2071 */
2072 ISCSI_DBG_EH(session, "Command has not made progress "
2073 "but commands ahead of it have. "
2074 "Asking scsi-ml for more time to "
2075 "complete. Our last xfer vs running task "
2076 "last xfer %lu/%lu. Last check %lu.\n",
2077 task->last_xfer, running_task->last_xfer,
2078 task->last_timeout);
2079 rc = BLK_EH_RESET_TIMER;
2080 goto done;
2081 }
2082 }
2083
Mike Christied355e572009-06-15 22:11:08 -05002084 /* Assumes nop timeout is shorter than scsi cmd timeout */
2085 if (task->have_checked_conn)
2086 goto done;
2087
Mike Christief6d51802007-12-13 12:43:30 -06002088 /*
Mike Christied355e572009-06-15 22:11:08 -05002089 * Checking the transport already or nop from a cmd timeout still
2090 * running
Mike Christief6d51802007-12-13 12:43:30 -06002091 */
Mike Christied355e572009-06-15 22:11:08 -05002092 if (conn->ping_task) {
2093 task->have_checked_conn = true;
Jens Axboe242f9dc2008-09-14 05:55:09 -07002094 rc = BLK_EH_RESET_TIMER;
Mike Christie4c48a822009-05-13 17:57:45 -05002095 goto done;
2096 }
2097
Mike Christied355e572009-06-15 22:11:08 -05002098 /* Make sure there is a transport check done */
2099 iscsi_send_nopout(conn, NULL);
2100 task->have_checked_conn = true;
2101 rc = BLK_EH_RESET_TIMER;
2102
Mike Christief6d51802007-12-13 12:43:30 -06002103done:
Mike Christied355e572009-06-15 22:11:08 -05002104 if (task)
2105 task->last_timeout = jiffies;
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002106 spin_unlock(&session->frwd_lock);
Erez Zilberbd2199d2009-06-15 22:11:10 -05002107 ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ?
Rafael David Tinocoa8cfc6d2017-12-07 19:59:13 -02002108 "timer reset" : "shutdown or nh");
Mike Christief6d51802007-12-13 12:43:30 -06002109 return rc;
2110}
2111
2112static void iscsi_check_transport_timeouts(unsigned long data)
2113{
2114 struct iscsi_conn *conn = (struct iscsi_conn *)data;
2115 struct iscsi_session *session = conn->session;
Mike Christie4cf10432008-05-07 20:43:52 -05002116 unsigned long recv_timeout, next_timeout = 0, last_recv;
Mike Christief6d51802007-12-13 12:43:30 -06002117
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002118 spin_lock(&session->frwd_lock);
Mike Christief6d51802007-12-13 12:43:30 -06002119 if (session->state != ISCSI_STATE_LOGGED_IN)
2120 goto done;
2121
Mike Christie4cf10432008-05-07 20:43:52 -05002122 recv_timeout = conn->recv_timeout;
2123 if (!recv_timeout)
Mike Christief6d51802007-12-13 12:43:30 -06002124 goto done;
2125
Mike Christie4cf10432008-05-07 20:43:52 -05002126 recv_timeout *= HZ;
Mike Christief6d51802007-12-13 12:43:30 -06002127 last_recv = conn->last_recv;
Mike Christie4c48a822009-05-13 17:57:45 -05002128
2129 if (iscsi_has_ping_timed_out(conn)) {
Mike Christie322d7392008-01-31 13:36:52 -06002130 iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs "
Mike Christie4c48a822009-05-13 17:57:45 -05002131 "expired, recv timeout %d, last rx %lu, "
2132 "last ping %lu, now %lu\n",
2133 conn->ping_timeout, conn->recv_timeout,
2134 last_recv, conn->last_ping, jiffies);
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002135 spin_unlock(&session->frwd_lock);
Mike Christie09ff7422014-07-12 15:51:51 -05002136 iscsi_conn_failure(conn, ISCSI_ERR_NOP_TIMEDOUT);
Mike Christief6d51802007-12-13 12:43:30 -06002137 return;
2138 }
2139
Mike Christie4cf10432008-05-07 20:43:52 -05002140 if (time_before_eq(last_recv + recv_timeout, jiffies)) {
Mike Christiec8611f92008-05-08 20:15:34 -05002141 /* send a ping to try to provoke some traffic */
Mike Christie1b2c7af2009-03-05 14:45:58 -06002142 ISCSI_DBG_CONN(conn, "Sending nopout as ping\n");
Ariel Nahum52f56642015-09-03 19:49:55 +03002143 if (iscsi_send_nopout(conn, NULL))
2144 next_timeout = jiffies + (1 * HZ);
2145 else
2146 next_timeout = conn->last_ping + (conn->ping_timeout * HZ);
Mike Christiead294e92008-01-31 13:36:50 -06002147 } else
Mike Christie4cf10432008-05-07 20:43:52 -05002148 next_timeout = last_recv + recv_timeout;
Mike Christief6d51802007-12-13 12:43:30 -06002149
Mike Christie1b2c7af2009-03-05 14:45:58 -06002150 ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout);
Mike Christiead294e92008-01-31 13:36:50 -06002151 mod_timer(&conn->transport_timer, next_timeout);
Mike Christief6d51802007-12-13 12:43:30 -06002152done:
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002153 spin_unlock(&session->frwd_lock);
Mike Christief6d51802007-12-13 12:43:30 -06002154}
2155
Mike Christie9c19a7d2008-05-21 15:54:09 -05002156static void iscsi_prep_abort_task_pdu(struct iscsi_task *task,
Mike Christie843c0a82007-12-13 12:43:20 -06002157 struct iscsi_tm *hdr)
2158{
2159 memset(hdr, 0, sizeof(*hdr));
2160 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2161 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
2162 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
Andy Grover55bdabd2011-06-16 15:57:09 -07002163 hdr->lun = task->lun;
Mike Christie577577d2008-12-02 00:32:05 -06002164 hdr->rtt = task->hdr_itt;
2165 hdr->refcmdsn = task->cmdsn;
Mike Christie843c0a82007-12-13 12:43:20 -06002166}
2167
Mike Christie7996a772006-04-06 21:13:41 -05002168int iscsi_eh_abort(struct scsi_cmnd *sc)
2169{
Mike Christie75613522008-05-21 15:53:59 -05002170 struct iscsi_cls_session *cls_session;
2171 struct iscsi_session *session;
Mike Christief47f2cf2006-08-31 18:09:33 -04002172 struct iscsi_conn *conn;
Mike Christie9c19a7d2008-05-21 15:54:09 -05002173 struct iscsi_task *task;
Mike Christie843c0a82007-12-13 12:43:20 -06002174 struct iscsi_tm *hdr;
Bart Van Asschee9e410e2016-03-30 11:27:08 -07002175 int age;
Mike Christie7996a772006-04-06 21:13:41 -05002176
Mike Christie75613522008-05-21 15:53:59 -05002177 cls_session = starget_to_session(scsi_target(sc->device));
2178 session = cls_session->dd_data;
2179
Erez Zilberbd2199d2009-06-15 22:11:10 -05002180 ISCSI_DBG_EH(session, "aborting sc %p\n", sc);
Mike Christie4421c9e2009-05-13 17:57:50 -05002181
Mike Christie6724add2007-08-15 01:38:30 -05002182 mutex_lock(&session->eh_mutex);
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002183 spin_lock_bh(&session->frwd_lock);
Mike Christief47f2cf2006-08-31 18:09:33 -04002184 /*
2185 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
2186 * got the command.
2187 */
2188 if (!sc->SCp.ptr) {
Erez Zilberbd2199d2009-06-15 22:11:10 -05002189 ISCSI_DBG_EH(session, "sc never reached iscsi layer or "
2190 "it completed.\n");
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002191 spin_unlock_bh(&session->frwd_lock);
Mike Christie6724add2007-08-15 01:38:30 -05002192 mutex_unlock(&session->eh_mutex);
Mike Christief47f2cf2006-08-31 18:09:33 -04002193 return SUCCESS;
2194 }
2195
Mike Christie7996a772006-04-06 21:13:41 -05002196 /*
2197 * If we are not logged in or we have started a new session
2198 * then let the host reset code handle this
2199 */
Mike Christie843c0a82007-12-13 12:43:20 -06002200 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
2201 sc->SCp.phase != session->age) {
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002202 spin_unlock_bh(&session->frwd_lock);
Mike Christie843c0a82007-12-13 12:43:20 -06002203 mutex_unlock(&session->eh_mutex);
Erez Zilberbd2199d2009-06-15 22:11:10 -05002204 ISCSI_DBG_EH(session, "failing abort due to dropped "
Mike Christie4421c9e2009-05-13 17:57:50 -05002205 "session.\n");
Mike Christie843c0a82007-12-13 12:43:20 -06002206 return FAILED;
2207 }
2208
2209 conn = session->leadconn;
2210 conn->eh_abort_cnt++;
2211 age = session->age;
2212
Mike Christie9c19a7d2008-05-21 15:54:09 -05002213 task = (struct iscsi_task *)sc->SCp.ptr;
Erez Zilberbd2199d2009-06-15 22:11:10 -05002214 ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n",
2215 sc, task->itt);
Mike Christie7996a772006-04-06 21:13:41 -05002216
Mike Christie9c19a7d2008-05-21 15:54:09 -05002217 /* task completed before time out */
2218 if (!task->sc) {
Erez Zilberbd2199d2009-06-15 22:11:10 -05002219 ISCSI_DBG_EH(session, "sc completed while abort in progress\n");
Mike Christie77a23c22007-05-30 12:57:18 -05002220 goto success;
Mike Christie7ea8b822006-07-24 15:47:22 -05002221 }
Mike Christie7996a772006-04-06 21:13:41 -05002222
Mike Christie9c19a7d2008-05-21 15:54:09 -05002223 if (task->state == ISCSI_TASK_PENDING) {
Mike Christieb3cd5052009-05-13 17:57:49 -05002224 fail_scsi_task(task, DID_ABORT);
Mike Christie77a23c22007-05-30 12:57:18 -05002225 goto success;
2226 }
Mike Christie7996a772006-04-06 21:13:41 -05002227
Mike Christie843c0a82007-12-13 12:43:20 -06002228 /* only have one tmf outstanding at a time */
2229 if (conn->tmf_state != TMF_INITIAL)
Mike Christie7996a772006-04-06 21:13:41 -05002230 goto failed;
Mike Christie843c0a82007-12-13 12:43:20 -06002231 conn->tmf_state = TMF_QUEUED;
Mike Christie7996a772006-04-06 21:13:41 -05002232
Mike Christie843c0a82007-12-13 12:43:20 -06002233 hdr = &conn->tmhdr;
Mike Christie9c19a7d2008-05-21 15:54:09 -05002234 iscsi_prep_abort_task_pdu(task, hdr);
Mike Christie843c0a82007-12-13 12:43:20 -06002235
Bart Van Asschee9e410e2016-03-30 11:27:08 -07002236 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout))
Mike Christie843c0a82007-12-13 12:43:20 -06002237 goto failed;
Mike Christie843c0a82007-12-13 12:43:20 -06002238
2239 switch (conn->tmf_state) {
2240 case TMF_SUCCESS:
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002241 spin_unlock_bh(&session->frwd_lock);
Mike Christie913e5bf2008-05-21 15:54:18 -05002242 /*
2243 * stop tx side incase the target had sent a abort rsp but
2244 * the initiator was still writing out data.
2245 */
Mike Christie6724add2007-08-15 01:38:30 -05002246 iscsi_suspend_tx(conn);
Mike Christie77a23c22007-05-30 12:57:18 -05002247 /*
Mike Christie913e5bf2008-05-21 15:54:18 -05002248 * we do not stop the recv side because targets have been
2249 * good and have never sent us a successful tmf response
2250 * then sent more data for the cmd.
Mike Christie77a23c22007-05-30 12:57:18 -05002251 */
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002252 spin_lock_bh(&session->frwd_lock);
Mike Christieb3cd5052009-05-13 17:57:49 -05002253 fail_scsi_task(task, DID_ABORT);
Mike Christie843c0a82007-12-13 12:43:20 -06002254 conn->tmf_state = TMF_INITIAL;
Mike Christie5d12c052009-11-11 16:34:32 -06002255 memset(hdr, 0, sizeof(*hdr));
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002256 spin_unlock_bh(&session->frwd_lock);
Mike Christie6724add2007-08-15 01:38:30 -05002257 iscsi_start_tx(conn);
Mike Christie77a23c22007-05-30 12:57:18 -05002258 goto success_unlocked;
Mike Christie843c0a82007-12-13 12:43:20 -06002259 case TMF_TIMEDOUT:
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002260 spin_unlock_bh(&session->frwd_lock);
Mike Christiedf4da5c2010-12-31 02:22:18 -06002261 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
Mike Christie843c0a82007-12-13 12:43:20 -06002262 goto failed_unlocked;
2263 case TMF_NOT_FOUND:
2264 if (!sc->SCp.ptr) {
2265 conn->tmf_state = TMF_INITIAL;
Mike Christie5d12c052009-11-11 16:34:32 -06002266 memset(hdr, 0, sizeof(*hdr));
Mike Christie9c19a7d2008-05-21 15:54:09 -05002267 /* task completed before tmf abort response */
Erez Zilberbd2199d2009-06-15 22:11:10 -05002268 ISCSI_DBG_EH(session, "sc completed while abort in "
2269 "progress\n");
Mike Christie77a23c22007-05-30 12:57:18 -05002270 goto success;
Mike Christie7ea8b822006-07-24 15:47:22 -05002271 }
2272 /* fall through */
2273 default:
Mike Christie843c0a82007-12-13 12:43:20 -06002274 conn->tmf_state = TMF_INITIAL;
2275 goto failed;
Mike Christie7996a772006-04-06 21:13:41 -05002276 }
2277
Mike Christie77a23c22007-05-30 12:57:18 -05002278success:
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002279 spin_unlock_bh(&session->frwd_lock);
Mike Christie77a23c22007-05-30 12:57:18 -05002280success_unlocked:
Erez Zilberbd2199d2009-06-15 22:11:10 -05002281 ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n",
2282 sc, task->itt);
Mike Christie6724add2007-08-15 01:38:30 -05002283 mutex_unlock(&session->eh_mutex);
Mike Christie7996a772006-04-06 21:13:41 -05002284 return SUCCESS;
2285
2286failed:
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002287 spin_unlock_bh(&session->frwd_lock);
Mike Christie77a23c22007-05-30 12:57:18 -05002288failed_unlocked:
Erez Zilberbd2199d2009-06-15 22:11:10 -05002289 ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc,
2290 task ? task->itt : 0);
Mike Christie6724add2007-08-15 01:38:30 -05002291 mutex_unlock(&session->eh_mutex);
Mike Christie7996a772006-04-06 21:13:41 -05002292 return FAILED;
2293}
2294EXPORT_SYMBOL_GPL(iscsi_eh_abort);
2295
Mike Christie843c0a82007-12-13 12:43:20 -06002296static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2297{
2298 memset(hdr, 0, sizeof(*hdr));
2299 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2300 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2301 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
Andy Grover55bdabd2011-06-16 15:57:09 -07002302 int_to_scsilun(sc->device->lun, &hdr->lun);
Mike Christief6d51802007-12-13 12:43:30 -06002303 hdr->rtt = RESERVED_ITT;
Mike Christie843c0a82007-12-13 12:43:20 -06002304}
2305
2306int iscsi_eh_device_reset(struct scsi_cmnd *sc)
2307{
Mike Christie75613522008-05-21 15:53:59 -05002308 struct iscsi_cls_session *cls_session;
2309 struct iscsi_session *session;
Mike Christie843c0a82007-12-13 12:43:20 -06002310 struct iscsi_conn *conn;
2311 struct iscsi_tm *hdr;
2312 int rc = FAILED;
2313
Mike Christie75613522008-05-21 15:53:59 -05002314 cls_session = starget_to_session(scsi_target(sc->device));
2315 session = cls_session->dd_data;
2316
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02002317 ISCSI_DBG_EH(session, "LU Reset [sc %p lun %llu]\n", sc,
2318 sc->device->lun);
Mike Christie843c0a82007-12-13 12:43:20 -06002319
2320 mutex_lock(&session->eh_mutex);
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002321 spin_lock_bh(&session->frwd_lock);
Mike Christie843c0a82007-12-13 12:43:20 -06002322 /*
2323 * Just check if we are not logged in. We cannot check for
2324 * the phase because the reset could come from a ioctl.
2325 */
2326 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2327 goto unlock;
2328 conn = session->leadconn;
2329
2330 /* only have one tmf outstanding at a time */
2331 if (conn->tmf_state != TMF_INITIAL)
2332 goto unlock;
2333 conn->tmf_state = TMF_QUEUED;
2334
2335 hdr = &conn->tmhdr;
2336 iscsi_prep_lun_reset_pdu(sc, hdr);
2337
Mike Christie9c19a7d2008-05-21 15:54:09 -05002338 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
Mike Christief6d51802007-12-13 12:43:30 -06002339 session->lu_reset_timeout)) {
Mike Christie843c0a82007-12-13 12:43:20 -06002340 rc = FAILED;
2341 goto unlock;
2342 }
2343
2344 switch (conn->tmf_state) {
2345 case TMF_SUCCESS:
2346 break;
2347 case TMF_TIMEDOUT:
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002348 spin_unlock_bh(&session->frwd_lock);
Mike Christiedf4da5c2010-12-31 02:22:18 -06002349 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
Mike Christie843c0a82007-12-13 12:43:20 -06002350 goto done;
2351 default:
2352 conn->tmf_state = TMF_INITIAL;
2353 goto unlock;
2354 }
2355
2356 rc = SUCCESS;
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002357 spin_unlock_bh(&session->frwd_lock);
Mike Christie843c0a82007-12-13 12:43:20 -06002358
2359 iscsi_suspend_tx(conn);
Mike Christie913e5bf2008-05-21 15:54:18 -05002360
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002361 spin_lock_bh(&session->frwd_lock);
Mike Christie5d12c052009-11-11 16:34:32 -06002362 memset(hdr, 0, sizeof(*hdr));
Mike Christie3bbaaad2009-05-13 17:57:46 -05002363 fail_scsi_tasks(conn, sc->device->lun, DID_ERROR);
Mike Christie843c0a82007-12-13 12:43:20 -06002364 conn->tmf_state = TMF_INITIAL;
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002365 spin_unlock_bh(&session->frwd_lock);
Mike Christie843c0a82007-12-13 12:43:20 -06002366
2367 iscsi_start_tx(conn);
2368 goto done;
2369
2370unlock:
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002371 spin_unlock_bh(&session->frwd_lock);
Mike Christie843c0a82007-12-13 12:43:20 -06002372done:
Erez Zilberbd2199d2009-06-15 22:11:10 -05002373 ISCSI_DBG_EH(session, "dev reset result = %s\n",
2374 rc == SUCCESS ? "SUCCESS" : "FAILED");
Mike Christie843c0a82007-12-13 12:43:20 -06002375 mutex_unlock(&session->eh_mutex);
2376 return rc;
2377}
2378EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
2379
Mike Christie3fe5ae82009-11-11 16:34:33 -06002380void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
2381{
2382 struct iscsi_session *session = cls_session->dd_data;
2383
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002384 spin_lock_bh(&session->frwd_lock);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002385 if (session->state != ISCSI_STATE_LOGGED_IN) {
2386 session->state = ISCSI_STATE_RECOVERY_FAILED;
2387 if (session->leadconn)
2388 wake_up(&session->leadconn->ehwait);
2389 }
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002390 spin_unlock_bh(&session->frwd_lock);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002391}
2392EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
2393
2394/**
2395 * iscsi_eh_session_reset - drop session and attempt relogin
2396 * @sc: scsi command
2397 *
2398 * This function will wait for a relogin, session termination from
2399 * userspace, or a recovery/replacement timeout.
2400 */
Jayamohan Kallickal309ce152010-02-20 08:02:10 +05302401int iscsi_eh_session_reset(struct scsi_cmnd *sc)
Mike Christie3fe5ae82009-11-11 16:34:33 -06002402{
2403 struct iscsi_cls_session *cls_session;
2404 struct iscsi_session *session;
2405 struct iscsi_conn *conn;
2406
2407 cls_session = starget_to_session(scsi_target(sc->device));
2408 session = cls_session->dd_data;
2409 conn = session->leadconn;
2410
2411 mutex_lock(&session->eh_mutex);
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002412 spin_lock_bh(&session->frwd_lock);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002413 if (session->state == ISCSI_STATE_TERMINATE) {
2414failed:
2415 ISCSI_DBG_EH(session,
2416 "failing session reset: Could not log back into "
2417 "%s, %s [age %d]\n", session->targetname,
2418 conn->persistent_address, session->age);
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002419 spin_unlock_bh(&session->frwd_lock);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002420 mutex_unlock(&session->eh_mutex);
2421 return FAILED;
2422 }
2423
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002424 spin_unlock_bh(&session->frwd_lock);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002425 mutex_unlock(&session->eh_mutex);
2426 /*
2427 * we drop the lock here but the leadconn cannot be destoyed while
2428 * we are in the scsi eh
2429 */
Mike Christiedf4da5c2010-12-31 02:22:18 -06002430 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002431
2432 ISCSI_DBG_EH(session, "wait for relogin\n");
2433 wait_event_interruptible(conn->ehwait,
2434 session->state == ISCSI_STATE_TERMINATE ||
2435 session->state == ISCSI_STATE_LOGGED_IN ||
2436 session->state == ISCSI_STATE_RECOVERY_FAILED);
2437 if (signal_pending(current))
2438 flush_signals(current);
2439
2440 mutex_lock(&session->eh_mutex);
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002441 spin_lock_bh(&session->frwd_lock);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002442 if (session->state == ISCSI_STATE_LOGGED_IN) {
2443 ISCSI_DBG_EH(session,
2444 "session reset succeeded for %s,%s\n",
2445 session->targetname, conn->persistent_address);
2446 } else
2447 goto failed;
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002448 spin_unlock_bh(&session->frwd_lock);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002449 mutex_unlock(&session->eh_mutex);
2450 return SUCCESS;
2451}
Jayamohan Kallickal309ce152010-02-20 08:02:10 +05302452EXPORT_SYMBOL_GPL(iscsi_eh_session_reset);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002453
2454static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2455{
2456 memset(hdr, 0, sizeof(*hdr));
2457 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2458 hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2459 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2460 hdr->rtt = RESERVED_ITT;
2461}
2462
2463/**
2464 * iscsi_eh_target_reset - reset target
2465 * @sc: scsi command
2466 *
Jayamohan Kallickal309ce152010-02-20 08:02:10 +05302467 * This will attempt to send a warm target reset.
Mike Christie3fe5ae82009-11-11 16:34:33 -06002468 */
Bart Van Assche3907adf2016-03-30 11:26:46 -07002469static int iscsi_eh_target_reset(struct scsi_cmnd *sc)
Mike Christie3fe5ae82009-11-11 16:34:33 -06002470{
2471 struct iscsi_cls_session *cls_session;
2472 struct iscsi_session *session;
2473 struct iscsi_conn *conn;
2474 struct iscsi_tm *hdr;
2475 int rc = FAILED;
2476
2477 cls_session = starget_to_session(scsi_target(sc->device));
2478 session = cls_session->dd_data;
2479
2480 ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc,
2481 session->targetname);
2482
2483 mutex_lock(&session->eh_mutex);
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002484 spin_lock_bh(&session->frwd_lock);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002485 /*
2486 * Just check if we are not logged in. We cannot check for
2487 * the phase because the reset could come from a ioctl.
2488 */
2489 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2490 goto unlock;
2491 conn = session->leadconn;
2492
2493 /* only have one tmf outstanding at a time */
2494 if (conn->tmf_state != TMF_INITIAL)
2495 goto unlock;
2496 conn->tmf_state = TMF_QUEUED;
2497
2498 hdr = &conn->tmhdr;
2499 iscsi_prep_tgt_reset_pdu(sc, hdr);
2500
2501 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
2502 session->tgt_reset_timeout)) {
2503 rc = FAILED;
2504 goto unlock;
2505 }
2506
2507 switch (conn->tmf_state) {
2508 case TMF_SUCCESS:
2509 break;
2510 case TMF_TIMEDOUT:
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002511 spin_unlock_bh(&session->frwd_lock);
Mike Christiedf4da5c2010-12-31 02:22:18 -06002512 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002513 goto done;
2514 default:
2515 conn->tmf_state = TMF_INITIAL;
2516 goto unlock;
2517 }
2518
2519 rc = SUCCESS;
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002520 spin_unlock_bh(&session->frwd_lock);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002521
2522 iscsi_suspend_tx(conn);
2523
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002524 spin_lock_bh(&session->frwd_lock);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002525 memset(hdr, 0, sizeof(*hdr));
2526 fail_scsi_tasks(conn, -1, DID_ERROR);
2527 conn->tmf_state = TMF_INITIAL;
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002528 spin_unlock_bh(&session->frwd_lock);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002529
2530 iscsi_start_tx(conn);
2531 goto done;
2532
2533unlock:
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002534 spin_unlock_bh(&session->frwd_lock);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002535done:
2536 ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname,
2537 rc == SUCCESS ? "SUCCESS" : "FAILED");
2538 mutex_unlock(&session->eh_mutex);
Jayamohan Kallickal309ce152010-02-20 08:02:10 +05302539 return rc;
2540}
Mike Christie3fe5ae82009-11-11 16:34:33 -06002541
Jayamohan Kallickal309ce152010-02-20 08:02:10 +05302542/**
2543 * iscsi_eh_recover_target - reset target and possibly the session
2544 * @sc: scsi command
2545 *
2546 * This will attempt to send a warm target reset. If that fails,
2547 * we will escalate to ERL0 session recovery.
2548 */
2549int iscsi_eh_recover_target(struct scsi_cmnd *sc)
2550{
2551 int rc;
2552
2553 rc = iscsi_eh_target_reset(sc);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002554 if (rc == FAILED)
2555 rc = iscsi_eh_session_reset(sc);
2556 return rc;
2557}
Jayamohan Kallickal309ce152010-02-20 08:02:10 +05302558EXPORT_SYMBOL_GPL(iscsi_eh_recover_target);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002559
Olaf Kirch63203772007-12-13 12:43:25 -06002560/*
2561 * Pre-allocate a pool of @max items of @item_size. By default, the pool
2562 * should be accessed via kfifo_{get,put} on q->queue.
2563 * Optionally, the caller can obtain the array of object pointers
2564 * by passing in a non-NULL @items pointer
2565 */
Mike Christie7996a772006-04-06 21:13:41 -05002566int
Olaf Kirch63203772007-12-13 12:43:25 -06002567iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
Mike Christie7996a772006-04-06 21:13:41 -05002568{
Olaf Kirch63203772007-12-13 12:43:25 -06002569 int i, num_arrays = 1;
Mike Christie7996a772006-04-06 21:13:41 -05002570
Olaf Kirch63203772007-12-13 12:43:25 -06002571 memset(q, 0, sizeof(*q));
Mike Christie7996a772006-04-06 21:13:41 -05002572
2573 q->max = max;
Olaf Kirch63203772007-12-13 12:43:25 -06002574
2575 /* If the user passed an items pointer, he wants a copy of
2576 * the array. */
2577 if (items)
2578 num_arrays++;
2579 q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL);
2580 if (q->pool == NULL)
Jean Delvaref474a372009-03-05 14:45:55 -06002581 return -ENOMEM;
Mike Christie7996a772006-04-06 21:13:41 -05002582
Stefani Seiboldc1e13f22009-12-21 14:37:27 -08002583 kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*));
Mike Christie7996a772006-04-06 21:13:41 -05002584
2585 for (i = 0; i < max; i++) {
Olaf Kirch63203772007-12-13 12:43:25 -06002586 q->pool[i] = kzalloc(item_size, GFP_KERNEL);
Mike Christie7996a772006-04-06 21:13:41 -05002587 if (q->pool[i] == NULL) {
Olaf Kirch63203772007-12-13 12:43:25 -06002588 q->max = i;
2589 goto enomem;
Mike Christie7996a772006-04-06 21:13:41 -05002590 }
Stefani Seibold7acd72e2009-12-21 14:37:28 -08002591 kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*));
Mike Christie7996a772006-04-06 21:13:41 -05002592 }
Olaf Kirch63203772007-12-13 12:43:25 -06002593
2594 if (items) {
2595 *items = q->pool + max;
2596 memcpy(*items, q->pool, max * sizeof(void *));
2597 }
2598
Mike Christie7996a772006-04-06 21:13:41 -05002599 return 0;
Olaf Kirch63203772007-12-13 12:43:25 -06002600
2601enomem:
2602 iscsi_pool_free(q);
2603 return -ENOMEM;
Mike Christie7996a772006-04-06 21:13:41 -05002604}
2605EXPORT_SYMBOL_GPL(iscsi_pool_init);
2606
Olaf Kirch63203772007-12-13 12:43:25 -06002607void iscsi_pool_free(struct iscsi_pool *q)
Mike Christie7996a772006-04-06 21:13:41 -05002608{
2609 int i;
2610
2611 for (i = 0; i < q->max; i++)
Olaf Kirch63203772007-12-13 12:43:25 -06002612 kfree(q->pool[i]);
Jean Delvaref474a372009-03-05 14:45:55 -06002613 kfree(q->pool);
Mike Christie7996a772006-04-06 21:13:41 -05002614}
2615EXPORT_SYMBOL_GPL(iscsi_pool_free);
2616
Mike Christiea4804cd2008-05-21 15:54:00 -05002617/**
2618 * iscsi_host_add - add host to system
2619 * @shost: scsi host
2620 * @pdev: parent device
2621 *
2622 * This should be called by partial offload and software iscsi drivers
2623 * to add a host to the system.
2624 */
2625int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev)
Mike Christie7996a772006-04-06 21:13:41 -05002626{
Mike Christie8e9a20c2008-06-16 10:11:33 -05002627 if (!shost->can_queue)
2628 shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX;
2629
Mike Christie4d108352009-03-05 14:46:04 -06002630 if (!shost->cmd_per_lun)
2631 shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN;
2632
Mike Christie308cec12009-02-06 12:06:20 -06002633 if (!shost->transportt->eh_timed_out)
2634 shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out;
Mike Christiea4804cd2008-05-21 15:54:00 -05002635 return scsi_add_host(shost, pdev);
2636}
2637EXPORT_SYMBOL_GPL(iscsi_host_add);
2638
2639/**
2640 * iscsi_host_alloc - allocate a host and driver data
2641 * @sht: scsi host template
2642 * @dd_data_size: driver host data size
Mike Christie32ae7632009-03-05 14:46:03 -06002643 * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue
Mike Christiea4804cd2008-05-21 15:54:00 -05002644 *
2645 * This should be called by partial offload and software iscsi drivers.
2646 * To access the driver specific memory use the iscsi_host_priv() macro.
2647 */
2648struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
Mike Christie4d108352009-03-05 14:46:04 -06002649 int dd_data_size, bool xmit_can_sleep)
Mike Christiea4804cd2008-05-21 15:54:00 -05002650{
2651 struct Scsi_Host *shost;
Mike Christiee5bd7b52008-09-24 11:46:10 -05002652 struct iscsi_host *ihost;
Mike Christiea4804cd2008-05-21 15:54:00 -05002653
2654 shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size);
2655 if (!shost)
2656 return NULL;
Mike Christiee5bd7b52008-09-24 11:46:10 -05002657 ihost = shost_priv(shost);
Mike Christie32ae7632009-03-05 14:46:03 -06002658
2659 if (xmit_can_sleep) {
2660 snprintf(ihost->workq_name, sizeof(ihost->workq_name),
2661 "iscsi_q_%d", shost->host_no);
2662 ihost->workq = create_singlethread_workqueue(ihost->workq_name);
2663 if (!ihost->workq)
2664 goto free_host;
2665 }
2666
Mike Christiee5bd7b52008-09-24 11:46:10 -05002667 spin_lock_init(&ihost->lock);
2668 ihost->state = ISCSI_HOST_SETUP;
2669 ihost->num_sessions = 0;
2670 init_waitqueue_head(&ihost->session_removal_wq);
Mike Christiea4804cd2008-05-21 15:54:00 -05002671 return shost;
Mike Christie32ae7632009-03-05 14:46:03 -06002672
2673free_host:
2674 scsi_host_put(shost);
2675 return NULL;
Mike Christie75613522008-05-21 15:53:59 -05002676}
Mike Christiea4804cd2008-05-21 15:54:00 -05002677EXPORT_SYMBOL_GPL(iscsi_host_alloc);
Mike Christie75613522008-05-21 15:53:59 -05002678
Mike Christiee5bd7b52008-09-24 11:46:10 -05002679static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session)
2680{
Mike Christie40a06e72009-03-05 14:46:05 -06002681 iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST);
Mike Christiee5bd7b52008-09-24 11:46:10 -05002682}
2683
Mike Christiea4804cd2008-05-21 15:54:00 -05002684/**
2685 * iscsi_host_remove - remove host and sessions
2686 * @shost: scsi host
2687 *
Mike Christiee5bd7b52008-09-24 11:46:10 -05002688 * If there are any sessions left, this will initiate the removal and wait
2689 * for the completion.
Mike Christiea4804cd2008-05-21 15:54:00 -05002690 */
2691void iscsi_host_remove(struct Scsi_Host *shost)
2692{
Mike Christiee5bd7b52008-09-24 11:46:10 -05002693 struct iscsi_host *ihost = shost_priv(shost);
2694 unsigned long flags;
2695
2696 spin_lock_irqsave(&ihost->lock, flags);
2697 ihost->state = ISCSI_HOST_REMOVED;
2698 spin_unlock_irqrestore(&ihost->lock, flags);
2699
2700 iscsi_host_for_each_session(shost, iscsi_notify_host_removed);
2701 wait_event_interruptible(ihost->session_removal_wq,
2702 ihost->num_sessions == 0);
2703 if (signal_pending(current))
2704 flush_signals(current);
2705
Mike Christiea4804cd2008-05-21 15:54:00 -05002706 scsi_remove_host(shost);
Mike Christie32ae7632009-03-05 14:46:03 -06002707 if (ihost->workq)
2708 destroy_workqueue(ihost->workq);
Mike Christiea4804cd2008-05-21 15:54:00 -05002709}
2710EXPORT_SYMBOL_GPL(iscsi_host_remove);
2711
2712void iscsi_host_free(struct Scsi_Host *shost)
Mike Christie75613522008-05-21 15:53:59 -05002713{
2714 struct iscsi_host *ihost = shost_priv(shost);
2715
2716 kfree(ihost->netdev);
2717 kfree(ihost->hwaddress);
2718 kfree(ihost->initiatorname);
Mike Christiea4804cd2008-05-21 15:54:00 -05002719 scsi_host_put(shost);
Mike Christie75613522008-05-21 15:53:59 -05002720}
Mike Christiea4804cd2008-05-21 15:54:00 -05002721EXPORT_SYMBOL_GPL(iscsi_host_free);
Mike Christie75613522008-05-21 15:53:59 -05002722
Mike Christiee5bd7b52008-09-24 11:46:10 -05002723static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost)
2724{
2725 struct iscsi_host *ihost = shost_priv(shost);
2726 unsigned long flags;
2727
2728 shost = scsi_host_get(shost);
2729 if (!shost) {
2730 printk(KERN_ERR "Invalid state. Cannot notify host removal "
2731 "of session teardown event because host already "
2732 "removed.\n");
2733 return;
2734 }
2735
2736 spin_lock_irqsave(&ihost->lock, flags);
2737 ihost->num_sessions--;
2738 if (ihost->num_sessions == 0)
2739 wake_up(&ihost->session_removal_wq);
2740 spin_unlock_irqrestore(&ihost->lock, flags);
2741 scsi_host_put(shost);
2742}
2743
Mike Christie75613522008-05-21 15:53:59 -05002744/**
2745 * iscsi_session_setup - create iscsi cls session and host and session
2746 * @iscsit: iscsi transport template
2747 * @shost: scsi host
2748 * @cmds_max: session can queue
Mike Christie9c19a7d2008-05-21 15:54:09 -05002749 * @cmd_task_size: LLD task private data size
Mike Christie75613522008-05-21 15:53:59 -05002750 * @initial_cmdsn: initial CmdSN
2751 *
2752 * This can be used by software iscsi_transports that allocate
2753 * a session per scsi host.
Mike Christie3cf7b232008-05-21 15:54:17 -05002754 *
2755 * Callers should set cmds_max to the largest total numer (mgmt + scsi) of
2756 * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks
2757 * for nop handling and login/logout requests.
Mike Christie75613522008-05-21 15:53:59 -05002758 */
2759struct iscsi_cls_session *
2760iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
Jayamohan Kallickalb8b9e1b82009-09-22 08:21:22 +05302761 uint16_t cmds_max, int dd_size, int cmd_task_size,
Mike Christie79706342008-05-21 15:54:12 -05002762 uint32_t initial_cmdsn, unsigned int id)
Mike Christie75613522008-05-21 15:53:59 -05002763{
Mike Christiee5bd7b52008-09-24 11:46:10 -05002764 struct iscsi_host *ihost = shost_priv(shost);
Mike Christie75613522008-05-21 15:53:59 -05002765 struct iscsi_session *session;
2766 struct iscsi_cls_session *cls_session;
Mike Christie3cf7b232008-05-21 15:54:17 -05002767 int cmd_i, scsi_cmds, total_cmds = cmds_max;
Mike Christiee5bd7b52008-09-24 11:46:10 -05002768 unsigned long flags;
2769
2770 spin_lock_irqsave(&ihost->lock, flags);
2771 if (ihost->state == ISCSI_HOST_REMOVED) {
2772 spin_unlock_irqrestore(&ihost->lock, flags);
2773 return NULL;
2774 }
2775 ihost->num_sessions++;
2776 spin_unlock_irqrestore(&ihost->lock, flags);
Mike Christie8e9a20c2008-06-16 10:11:33 -05002777
2778 if (!total_cmds)
2779 total_cmds = ISCSI_DEF_XMIT_CMDS_MAX;
Mike Christie3e5c28a2008-05-21 15:54:06 -05002780 /*
Mike Christie3cf7b232008-05-21 15:54:17 -05002781 * The iscsi layer needs some tasks for nop handling and tmfs,
2782 * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX
2783 * + 1 command for scsi IO.
Mike Christie3e5c28a2008-05-21 15:54:06 -05002784 */
Mike Christie3cf7b232008-05-21 15:54:17 -05002785 if (total_cmds < ISCSI_TOTAL_CMDS_MIN) {
2786 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2787 "must be a power of two that is at least %d.\n",
2788 total_cmds, ISCSI_TOTAL_CMDS_MIN);
Mike Christiee5bd7b52008-09-24 11:46:10 -05002789 goto dec_session_count;
Mike Christie15482712007-05-30 12:57:19 -05002790 }
Mike Christie3cf7b232008-05-21 15:54:17 -05002791
2792 if (total_cmds > ISCSI_TOTAL_CMDS_MAX) {
2793 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2794 "must be a power of 2 less than or equal to %d.\n",
2795 cmds_max, ISCSI_TOTAL_CMDS_MAX);
2796 total_cmds = ISCSI_TOTAL_CMDS_MAX;
2797 }
2798
2799 if (!is_power_of_2(total_cmds)) {
2800 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2801 "must be a power of 2.\n", total_cmds);
2802 total_cmds = rounddown_pow_of_two(total_cmds);
2803 if (total_cmds < ISCSI_TOTAL_CMDS_MIN)
2804 return NULL;
2805 printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n",
2806 total_cmds);
2807 }
2808 scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX;
Mike Christie15482712007-05-30 12:57:19 -05002809
Mike Christie5d91e202008-05-21 15:54:01 -05002810 cls_session = iscsi_alloc_session(shost, iscsit,
Jayamohan Kallickalb8b9e1b82009-09-22 08:21:22 +05302811 sizeof(struct iscsi_session) +
2812 dd_size);
Mike Christie75613522008-05-21 15:53:59 -05002813 if (!cls_session)
Mike Christiee5bd7b52008-09-24 11:46:10 -05002814 goto dec_session_count;
Mike Christie75613522008-05-21 15:53:59 -05002815 session = cls_session->dd_data;
2816 session->cls_session = cls_session;
Mike Christie7996a772006-04-06 21:13:41 -05002817 session->host = shost;
2818 session->state = ISCSI_STATE_FREE;
Mike Christief6d51802007-12-13 12:43:30 -06002819 session->fast_abort = 1;
Mike Christie3fe5ae82009-11-11 16:34:33 -06002820 session->tgt_reset_timeout = 30;
Mike Christie4cd49ea2007-12-13 12:43:38 -06002821 session->lu_reset_timeout = 15;
2822 session->abort_timeout = 10;
Mike Christie3cf7b232008-05-21 15:54:17 -05002823 session->scsi_cmds_max = scsi_cmds;
2824 session->cmds_max = total_cmds;
Mike Christiee0726402007-07-26 12:46:48 -05002825 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
Mike Christie7996a772006-04-06 21:13:41 -05002826 session->exp_cmdsn = initial_cmdsn + 1;
2827 session->max_cmdsn = initial_cmdsn + 1;
2828 session->max_r2t = 1;
2829 session->tt = iscsit;
Jayamohan Kallickalb8b9e1b82009-09-22 08:21:22 +05302830 session->dd_data = cls_session->dd_data + sizeof(*session);
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002831
Mike Christie6724add2007-08-15 01:38:30 -05002832 mutex_init(&session->eh_mutex);
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002833 spin_lock_init(&session->frwd_lock);
2834 spin_lock_init(&session->back_lock);
Mike Christie7996a772006-04-06 21:13:41 -05002835
2836 /* initialize SCSI PDU commands pool */
2837 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
2838 (void***)&session->cmds,
Mike Christie9c19a7d2008-05-21 15:54:09 -05002839 cmd_task_size + sizeof(struct iscsi_task)))
Mike Christie7996a772006-04-06 21:13:41 -05002840 goto cmdpool_alloc_fail;
2841
2842 /* pre-format cmds pool with ITT */
2843 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
Mike Christie9c19a7d2008-05-21 15:54:09 -05002844 struct iscsi_task *task = session->cmds[cmd_i];
Mike Christie7996a772006-04-06 21:13:41 -05002845
Mike Christie9c19a7d2008-05-21 15:54:09 -05002846 if (cmd_task_size)
2847 task->dd_data = &task[1];
2848 task->itt = cmd_i;
Mike Christie3bbaaad2009-05-13 17:57:46 -05002849 task->state = ISCSI_TASK_FREE;
Mike Christie9c19a7d2008-05-21 15:54:09 -05002850 INIT_LIST_HEAD(&task->running);
Mike Christie7996a772006-04-06 21:13:41 -05002851 }
2852
Mike Christief53a88d2006-06-28 12:00:27 -05002853 if (!try_module_get(iscsit->owner))
Mike Christie75613522008-05-21 15:53:59 -05002854 goto module_get_fail;
2855
Mike Christie79706342008-05-21 15:54:12 -05002856 if (iscsi_add_session(cls_session, id))
Mike Christief53a88d2006-06-28 12:00:27 -05002857 goto cls_session_fail;
Mike Christiee5bd7b52008-09-24 11:46:10 -05002858
Mike Christie7996a772006-04-06 21:13:41 -05002859 return cls_session;
2860
2861cls_session_fail:
Mike Christie75613522008-05-21 15:53:59 -05002862 module_put(iscsit->owner);
2863module_get_fail:
Olaf Kirch63203772007-12-13 12:43:25 -06002864 iscsi_pool_free(&session->cmdpool);
Mike Christie7996a772006-04-06 21:13:41 -05002865cmdpool_alloc_fail:
Mike Christie75613522008-05-21 15:53:59 -05002866 iscsi_free_session(cls_session);
Mike Christiee5bd7b52008-09-24 11:46:10 -05002867dec_session_count:
2868 iscsi_host_dec_session_cnt(shost);
Mike Christie7996a772006-04-06 21:13:41 -05002869 return NULL;
2870}
2871EXPORT_SYMBOL_GPL(iscsi_session_setup);
2872
2873/**
2874 * iscsi_session_teardown - destroy session, host, and cls_session
Mike Christie75613522008-05-21 15:53:59 -05002875 * @cls_session: iscsi session
Mike Christie7996a772006-04-06 21:13:41 -05002876 *
Mike Christie75613522008-05-21 15:53:59 -05002877 * The driver must have called iscsi_remove_session before
2878 * calling this.
2879 */
Mike Christie7996a772006-04-06 21:13:41 -05002880void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
2881{
Mike Christie75613522008-05-21 15:53:59 -05002882 struct iscsi_session *session = cls_session->dd_data;
Mike Christie63f75cc2006-07-24 15:47:29 -05002883 struct module *owner = cls_session->transport->owner;
Mike Christiee5bd7b52008-09-24 11:46:10 -05002884 struct Scsi_Host *shost = session->host;
Mike Christie7996a772006-04-06 21:13:41 -05002885
Olaf Kirch63203772007-12-13 12:43:25 -06002886 iscsi_pool_free(&session->cmdpool);
Mike Christie7996a772006-04-06 21:13:41 -05002887
Mike Christieb2c64162007-05-30 12:57:16 -05002888 kfree(session->password);
2889 kfree(session->password_in);
2890 kfree(session->username);
2891 kfree(session->username_in);
Mike Christief3ff0c32006-07-24 15:47:50 -05002892 kfree(session->targetname);
Vikas Chaudhary3c5c4802012-01-19 03:06:53 -08002893 kfree(session->targetalias);
Mike Christie88dfd342008-05-21 15:54:16 -05002894 kfree(session->initiatorname);
Eddie Wai3b9373e2013-06-20 10:21:26 -07002895 kfree(session->boot_root);
2896 kfree(session->boot_nic);
2897 kfree(session->boot_target);
Mike Christie88dfd342008-05-21 15:54:16 -05002898 kfree(session->ifacename);
Adheer Chandravanshif8525eb2013-07-01 05:54:12 -04002899 kfree(session->portal_type);
2900 kfree(session->discovery_parent_type);
Mike Christief3ff0c32006-07-24 15:47:50 -05002901
Mike Christie75613522008-05-21 15:53:59 -05002902 iscsi_destroy_session(cls_session);
Mike Christiee5bd7b52008-09-24 11:46:10 -05002903 iscsi_host_dec_session_cnt(shost);
Mike Christie63f75cc2006-07-24 15:47:29 -05002904 module_put(owner);
Mike Christie7996a772006-04-06 21:13:41 -05002905}
2906EXPORT_SYMBOL_GPL(iscsi_session_teardown);
2907
2908/**
2909 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
2910 * @cls_session: iscsi_cls_session
Mike Christie5d91e202008-05-21 15:54:01 -05002911 * @dd_size: private driver data size
Mike Christie7996a772006-04-06 21:13:41 -05002912 * @conn_idx: cid
Mike Christie5d91e202008-05-21 15:54:01 -05002913 */
Mike Christie7996a772006-04-06 21:13:41 -05002914struct iscsi_cls_conn *
Mike Christie5d91e202008-05-21 15:54:01 -05002915iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size,
2916 uint32_t conn_idx)
Mike Christie7996a772006-04-06 21:13:41 -05002917{
Mike Christie75613522008-05-21 15:53:59 -05002918 struct iscsi_session *session = cls_session->dd_data;
Mike Christie7996a772006-04-06 21:13:41 -05002919 struct iscsi_conn *conn;
2920 struct iscsi_cls_conn *cls_conn;
Mike Christied36ab6f2006-05-18 20:31:34 -05002921 char *data;
Mike Christie7996a772006-04-06 21:13:41 -05002922
Mike Christie5d91e202008-05-21 15:54:01 -05002923 cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size,
2924 conn_idx);
Mike Christie7996a772006-04-06 21:13:41 -05002925 if (!cls_conn)
2926 return NULL;
2927 conn = cls_conn->dd_data;
Mike Christie5d91e202008-05-21 15:54:01 -05002928 memset(conn, 0, sizeof(*conn) + dd_size);
Mike Christie7996a772006-04-06 21:13:41 -05002929
Mike Christie5d91e202008-05-21 15:54:01 -05002930 conn->dd_data = cls_conn->dd_data + sizeof(*conn);
Mike Christie7996a772006-04-06 21:13:41 -05002931 conn->session = session;
2932 conn->cls_conn = cls_conn;
2933 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
2934 conn->id = conn_idx;
2935 conn->exp_statsn = 0;
Mike Christie843c0a82007-12-13 12:43:20 -06002936 conn->tmf_state = TMF_INITIAL;
Mike Christief6d51802007-12-13 12:43:30 -06002937
2938 init_timer(&conn->transport_timer);
2939 conn->transport_timer.data = (unsigned long)conn;
2940 conn->transport_timer.function = iscsi_check_transport_timeouts;
2941
Mike Christie843c0a82007-12-13 12:43:20 -06002942 INIT_LIST_HEAD(&conn->mgmtqueue);
Mike Christie3bbaaad2009-05-13 17:57:46 -05002943 INIT_LIST_HEAD(&conn->cmdqueue);
Mike Christie843c0a82007-12-13 12:43:20 -06002944 INIT_LIST_HEAD(&conn->requeue);
Chris Leechde1ff842017-02-27 16:58:36 -08002945 spin_lock_init(&conn->taskqueuelock);
David Howellsc4028952006-11-22 14:57:56 +00002946 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
Mike Christie7996a772006-04-06 21:13:41 -05002947
Mike Christie9c19a7d2008-05-21 15:54:09 -05002948 /* allocate login_task used for the login/text sequences */
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002949 spin_lock_bh(&session->frwd_lock);
Stefani Seibold7acd72e2009-12-21 14:37:28 -08002950 if (!kfifo_out(&session->cmdpool.queue,
Mike Christie9c19a7d2008-05-21 15:54:09 -05002951 (void*)&conn->login_task,
Mike Christie7996a772006-04-06 21:13:41 -05002952 sizeof(void*))) {
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002953 spin_unlock_bh(&session->frwd_lock);
Mike Christie9c19a7d2008-05-21 15:54:09 -05002954 goto login_task_alloc_fail;
Mike Christie7996a772006-04-06 21:13:41 -05002955 }
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002956 spin_unlock_bh(&session->frwd_lock);
Mike Christie7996a772006-04-06 21:13:41 -05002957
Mike Christiecfeb2cf2008-12-02 00:32:09 -06002958 data = (char *) __get_free_pages(GFP_KERNEL,
2959 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
Mike Christied36ab6f2006-05-18 20:31:34 -05002960 if (!data)
Mike Christie9c19a7d2008-05-21 15:54:09 -05002961 goto login_task_data_alloc_fail;
2962 conn->login_task->data = conn->data = data;
Mike Christied36ab6f2006-05-18 20:31:34 -05002963
Mike Christie843c0a82007-12-13 12:43:20 -06002964 init_timer(&conn->tmf_timer);
Mike Christie7996a772006-04-06 21:13:41 -05002965 init_waitqueue_head(&conn->ehwait);
2966
2967 return cls_conn;
2968
Mike Christie9c19a7d2008-05-21 15:54:09 -05002969login_task_data_alloc_fail:
Stefani Seibold7acd72e2009-12-21 14:37:28 -08002970 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
Mike Christied36ab6f2006-05-18 20:31:34 -05002971 sizeof(void*));
Mike Christie9c19a7d2008-05-21 15:54:09 -05002972login_task_alloc_fail:
Mike Christie7996a772006-04-06 21:13:41 -05002973 iscsi_destroy_conn(cls_conn);
2974 return NULL;
2975}
2976EXPORT_SYMBOL_GPL(iscsi_conn_setup);
2977
2978/**
2979 * iscsi_conn_teardown - teardown iscsi connection
2980 * cls_conn: iscsi class connection
2981 *
2982 * TODO: we may need to make this into a two step process
2983 * like scsi-mls remove + put host
2984 */
2985void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
2986{
2987 struct iscsi_conn *conn = cls_conn->dd_data;
2988 struct iscsi_session *session = conn->session;
Mike Christie7996a772006-04-06 21:13:41 -05002989
Mike Christief6d51802007-12-13 12:43:30 -06002990 del_timer_sync(&conn->transport_timer);
2991
John Soni Jose660d0832015-06-24 06:41:58 +05302992 mutex_lock(&session->eh_mutex);
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002993 spin_lock_bh(&session->frwd_lock);
Mike Christie7996a772006-04-06 21:13:41 -05002994 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
2995 if (session->leadconn == conn) {
2996 /*
2997 * leading connection? then give up on recovery.
2998 */
2999 session->state = ISCSI_STATE_TERMINATE;
3000 wake_up(&conn->ehwait);
3001 }
Shlomo Pongratz659743b2014-02-07 00:41:38 -06003002 spin_unlock_bh(&session->frwd_lock);
Mike Christie7996a772006-04-06 21:13:41 -05003003
Mike Christie779ea122007-02-28 17:32:15 -06003004 /* flush queued up work because we free the connection below */
Mike Christie843c0a82007-12-13 12:43:20 -06003005 iscsi_suspend_tx(conn);
Mike Christie779ea122007-02-28 17:32:15 -06003006
Shlomo Pongratz659743b2014-02-07 00:41:38 -06003007 spin_lock_bh(&session->frwd_lock);
Mike Christiecfeb2cf2008-12-02 00:32:09 -06003008 free_pages((unsigned long) conn->data,
3009 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
Mike Christief3ff0c32006-07-24 15:47:50 -05003010 kfree(conn->persistent_address);
Adheer Chandravanshiae56ff42013-11-22 05:28:21 -05003011 kfree(conn->local_ipaddr);
Shlomo Pongratz659743b2014-02-07 00:41:38 -06003012 /* regular RX path uses back_lock */
3013 spin_lock_bh(&session->back_lock);
Stefani Seibold7acd72e2009-12-21 14:37:28 -08003014 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
Mike Christie7996a772006-04-06 21:13:41 -05003015 sizeof(void*));
Shlomo Pongratz659743b2014-02-07 00:41:38 -06003016 spin_unlock_bh(&session->back_lock);
Mike Christiee0726402007-07-26 12:46:48 -05003017 if (session->leadconn == conn)
Mike Christie7996a772006-04-06 21:13:41 -05003018 session->leadconn = NULL;
Shlomo Pongratz659743b2014-02-07 00:41:38 -06003019 spin_unlock_bh(&session->frwd_lock);
John Soni Jose660d0832015-06-24 06:41:58 +05303020 mutex_unlock(&session->eh_mutex);
Mike Christie7996a772006-04-06 21:13:41 -05003021
Mike Christie7996a772006-04-06 21:13:41 -05003022 iscsi_destroy_conn(cls_conn);
3023}
3024EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
3025
3026int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
3027{
3028 struct iscsi_conn *conn = cls_conn->dd_data;
3029 struct iscsi_session *session = conn->session;
3030
Mike Christieffd04362006-08-31 18:09:24 -04003031 if (!session) {
Mike Christie322d7392008-01-31 13:36:52 -06003032 iscsi_conn_printk(KERN_ERR, conn,
3033 "can't start unbound connection\n");
Mike Christie7996a772006-04-06 21:13:41 -05003034 return -EPERM;
3035 }
3036
Mike Christiedb98ccd2006-08-31 18:09:31 -04003037 if ((session->imm_data_en || !session->initial_r2t_en) &&
3038 session->first_burst > session->max_burst) {
Mike Christie322d7392008-01-31 13:36:52 -06003039 iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: "
3040 "first_burst %d max_burst %d\n",
3041 session->first_burst, session->max_burst);
Mike Christieffd04362006-08-31 18:09:24 -04003042 return -EINVAL;
3043 }
3044
Mike Christief6d51802007-12-13 12:43:30 -06003045 if (conn->ping_timeout && !conn->recv_timeout) {
Mike Christie322d7392008-01-31 13:36:52 -06003046 iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of "
3047 "zero. Using 5 seconds\n.");
Mike Christief6d51802007-12-13 12:43:30 -06003048 conn->recv_timeout = 5;
3049 }
3050
3051 if (conn->recv_timeout && !conn->ping_timeout) {
Mike Christie322d7392008-01-31 13:36:52 -06003052 iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of "
3053 "zero. Using 5 seconds.\n");
Mike Christief6d51802007-12-13 12:43:30 -06003054 conn->ping_timeout = 5;
3055 }
3056
Shlomo Pongratz659743b2014-02-07 00:41:38 -06003057 spin_lock_bh(&session->frwd_lock);
Mike Christie7996a772006-04-06 21:13:41 -05003058 conn->c_stage = ISCSI_CONN_STARTED;
3059 session->state = ISCSI_STATE_LOGGED_IN;
Mike Christiee0726402007-07-26 12:46:48 -05003060 session->queued_cmdsn = session->cmdsn;
Mike Christie7996a772006-04-06 21:13:41 -05003061
Mike Christief6d51802007-12-13 12:43:30 -06003062 conn->last_recv = jiffies;
3063 conn->last_ping = jiffies;
3064 if (conn->recv_timeout && conn->ping_timeout)
3065 mod_timer(&conn->transport_timer,
3066 jiffies + (conn->recv_timeout * HZ));
3067
Mike Christie7996a772006-04-06 21:13:41 -05003068 switch(conn->stop_stage) {
3069 case STOP_CONN_RECOVER:
3070 /*
3071 * unblock eh_abort() if it is blocked. re-try all
3072 * commands after successful recovery
3073 */
Mike Christie7996a772006-04-06 21:13:41 -05003074 conn->stop_stage = 0;
Mike Christie843c0a82007-12-13 12:43:20 -06003075 conn->tmf_state = TMF_INITIAL;
Mike Christie7996a772006-04-06 21:13:41 -05003076 session->age++;
Mike Christie8b1d0342008-01-31 13:36:53 -06003077 if (session->age == 16)
3078 session->age = 0;
Mike Christie6eabafb2008-01-31 13:36:43 -06003079 break;
Mike Christie7996a772006-04-06 21:13:41 -05003080 case STOP_CONN_TERM:
Mike Christie7996a772006-04-06 21:13:41 -05003081 conn->stop_stage = 0;
3082 break;
Mike Christie7996a772006-04-06 21:13:41 -05003083 default:
3084 break;
3085 }
Shlomo Pongratz659743b2014-02-07 00:41:38 -06003086 spin_unlock_bh(&session->frwd_lock);
Mike Christie7996a772006-04-06 21:13:41 -05003087
Mike Christie75613522008-05-21 15:53:59 -05003088 iscsi_unblock_session(session->cls_session);
Mike Christie6eabafb2008-01-31 13:36:43 -06003089 wake_up(&conn->ehwait);
Mike Christie7996a772006-04-06 21:13:41 -05003090 return 0;
3091}
3092EXPORT_SYMBOL_GPL(iscsi_conn_start);
3093
3094static void
Mike Christie3bbaaad2009-05-13 17:57:46 -05003095fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn)
Mike Christie7996a772006-04-06 21:13:41 -05003096{
Mike Christie3bbaaad2009-05-13 17:57:46 -05003097 struct iscsi_task *task;
Mike Christieb3cd5052009-05-13 17:57:49 -05003098 int i, state;
Mike Christie7996a772006-04-06 21:13:41 -05003099
Mike Christie3bbaaad2009-05-13 17:57:46 -05003100 for (i = 0; i < conn->session->cmds_max; i++) {
3101 task = conn->session->cmds[i];
3102 if (task->sc)
3103 continue;
3104
3105 if (task->state == ISCSI_TASK_FREE)
3106 continue;
3107
3108 ISCSI_DBG_SESSION(conn->session,
3109 "failing mgmt itt 0x%x state %d\n",
3110 task->itt, task->state);
Mike Christieb3cd5052009-05-13 17:57:49 -05003111 state = ISCSI_TASK_ABRT_SESS_RECOV;
3112 if (task->state == ISCSI_TASK_PENDING)
3113 state = ISCSI_TASK_COMPLETED;
3114 iscsi_complete_task(task, state);
3115
Mike Christie7996a772006-04-06 21:13:41 -05003116 }
Mike Christie7996a772006-04-06 21:13:41 -05003117}
3118
Mike Christie656cffc2006-05-18 20:31:42 -05003119static void iscsi_start_session_recovery(struct iscsi_session *session,
3120 struct iscsi_conn *conn, int flag)
Mike Christie7996a772006-04-06 21:13:41 -05003121{
Mike Christieed2abc72006-05-02 19:46:40 -05003122 int old_stop_stage;
3123
Mike Christie6724add2007-08-15 01:38:30 -05003124 mutex_lock(&session->eh_mutex);
Shlomo Pongratz659743b2014-02-07 00:41:38 -06003125 spin_lock_bh(&session->frwd_lock);
Mike Christieed2abc72006-05-02 19:46:40 -05003126 if (conn->stop_stage == STOP_CONN_TERM) {
Shlomo Pongratz659743b2014-02-07 00:41:38 -06003127 spin_unlock_bh(&session->frwd_lock);
Mike Christie6724add2007-08-15 01:38:30 -05003128 mutex_unlock(&session->eh_mutex);
3129 return;
3130 }
3131
3132 /*
Mike Christieed2abc72006-05-02 19:46:40 -05003133 * When this is called for the in_login state, we only want to clean
Mike Christie9c19a7d2008-05-21 15:54:09 -05003134 * up the login task and connection. We do not need to block and set
Mike Christie67a61112006-05-30 00:37:20 -05003135 * the recovery state again
Mike Christieed2abc72006-05-02 19:46:40 -05003136 */
Mike Christie67a61112006-05-30 00:37:20 -05003137 if (flag == STOP_CONN_TERM)
3138 session->state = ISCSI_STATE_TERMINATE;
3139 else if (conn->stop_stage != STOP_CONN_RECOVER)
3140 session->state = ISCSI_STATE_IN_RECOVERY;
Mike Christie4ae0a6c2010-03-09 14:14:51 -06003141
3142 old_stop_stage = conn->stop_stage;
3143 conn->stop_stage = flag;
Shlomo Pongratz659743b2014-02-07 00:41:38 -06003144 spin_unlock_bh(&session->frwd_lock);
Mike Christieed2abc72006-05-02 19:46:40 -05003145
Mike Christie26013ad2009-05-13 17:57:43 -05003146 del_timer_sync(&conn->transport_timer);
3147 iscsi_suspend_tx(conn);
3148
Shlomo Pongratz659743b2014-02-07 00:41:38 -06003149 spin_lock_bh(&session->frwd_lock);
Mike Christie67a61112006-05-30 00:37:20 -05003150 conn->c_stage = ISCSI_CONN_STOPPED;
Shlomo Pongratz659743b2014-02-07 00:41:38 -06003151 spin_unlock_bh(&session->frwd_lock);
Mike Christie6724add2007-08-15 01:38:30 -05003152
Mike Christie7996a772006-04-06 21:13:41 -05003153 /*
3154 * for connection level recovery we should not calculate
3155 * header digest. conn->hdr_size used for optimization
3156 * in hdr_extract() and will be re-negotiated at
3157 * set_param() time.
3158 */
3159 if (flag == STOP_CONN_RECOVER) {
3160 conn->hdrdgst_en = 0;
3161 conn->datadgst_en = 0;
Mike Christie656cffc2006-05-18 20:31:42 -05003162 if (session->state == ISCSI_STATE_IN_RECOVERY &&
Mike Christie67a61112006-05-30 00:37:20 -05003163 old_stop_stage != STOP_CONN_RECOVER) {
Mike Christie1b2c7af2009-03-05 14:45:58 -06003164 ISCSI_DBG_SESSION(session, "blocking session\n");
Mike Christie75613522008-05-21 15:53:59 -05003165 iscsi_block_session(session->cls_session);
Mike Christie67a61112006-05-30 00:37:20 -05003166 }
Mike Christie7996a772006-04-06 21:13:41 -05003167 }
Mike Christie656cffc2006-05-18 20:31:42 -05003168
Mike Christie656cffc2006-05-18 20:31:42 -05003169 /*
3170 * flush queues.
3171 */
Shlomo Pongratz659743b2014-02-07 00:41:38 -06003172 spin_lock_bh(&session->frwd_lock);
Mike Christieb3cd5052009-05-13 17:57:49 -05003173 fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED);
Mike Christie3bbaaad2009-05-13 17:57:46 -05003174 fail_mgmt_tasks(session, conn);
Mike Christie5d12c052009-11-11 16:34:32 -06003175 memset(&conn->tmhdr, 0, sizeof(conn->tmhdr));
Shlomo Pongratz659743b2014-02-07 00:41:38 -06003176 spin_unlock_bh(&session->frwd_lock);
Mike Christie6724add2007-08-15 01:38:30 -05003177 mutex_unlock(&session->eh_mutex);
Mike Christie7996a772006-04-06 21:13:41 -05003178}
Mike Christie7996a772006-04-06 21:13:41 -05003179
3180void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
3181{
3182 struct iscsi_conn *conn = cls_conn->dd_data;
3183 struct iscsi_session *session = conn->session;
3184
3185 switch (flag) {
3186 case STOP_CONN_RECOVER:
3187 case STOP_CONN_TERM:
3188 iscsi_start_session_recovery(session, conn, flag);
Mike Christie8d2860b2006-05-02 19:46:47 -05003189 break;
Mike Christie7996a772006-04-06 21:13:41 -05003190 default:
Mike Christie322d7392008-01-31 13:36:52 -06003191 iscsi_conn_printk(KERN_ERR, conn,
3192 "invalid stop flag %d\n", flag);
Mike Christie7996a772006-04-06 21:13:41 -05003193 }
3194}
3195EXPORT_SYMBOL_GPL(iscsi_conn_stop);
3196
3197int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
3198 struct iscsi_cls_conn *cls_conn, int is_leading)
3199{
Mike Christie75613522008-05-21 15:53:59 -05003200 struct iscsi_session *session = cls_session->dd_data;
Mike Christie98644042006-10-16 18:09:39 -04003201 struct iscsi_conn *conn = cls_conn->dd_data;
Mike Christie7996a772006-04-06 21:13:41 -05003202
Shlomo Pongratz659743b2014-02-07 00:41:38 -06003203 spin_lock_bh(&session->frwd_lock);
Mike Christie7996a772006-04-06 21:13:41 -05003204 if (is_leading)
3205 session->leadconn = conn;
Shlomo Pongratz659743b2014-02-07 00:41:38 -06003206 spin_unlock_bh(&session->frwd_lock);
Mike Christie7996a772006-04-06 21:13:41 -05003207
3208 /*
3209 * Unblock xmitworker(), Login Phase will pass through.
3210 */
3211 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
3212 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
3213 return 0;
3214}
3215EXPORT_SYMBOL_GPL(iscsi_conn_bind);
3216
Adheer Chandravanshiadaf6992013-03-22 07:41:30 -04003217int iscsi_switch_str_param(char **param, char *new_val_buf)
Mike Christie5700b1a2009-05-13 17:57:40 -05003218{
3219 char *new_val;
3220
3221 if (*param) {
3222 if (!strcmp(*param, new_val_buf))
3223 return 0;
3224 }
3225
3226 new_val = kstrdup(new_val_buf, GFP_NOIO);
3227 if (!new_val)
3228 return -ENOMEM;
3229
3230 kfree(*param);
3231 *param = new_val;
3232 return 0;
3233}
Adheer Chandravanshiadaf6992013-03-22 07:41:30 -04003234EXPORT_SYMBOL_GPL(iscsi_switch_str_param);
Mike Christiea54a52c2006-06-28 12:00:23 -05003235
3236int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
3237 enum iscsi_param param, char *buf, int buflen)
3238{
3239 struct iscsi_conn *conn = cls_conn->dd_data;
3240 struct iscsi_session *session = conn->session;
Or Gerlitz6a06a4b2013-08-08 13:44:29 +03003241 int val;
Mike Christiea54a52c2006-06-28 12:00:23 -05003242
3243 switch(param) {
Mike Christie843c0a82007-12-13 12:43:20 -06003244 case ISCSI_PARAM_FAST_ABORT:
3245 sscanf(buf, "%d", &session->fast_abort);
3246 break;
Mike Christief6d51802007-12-13 12:43:30 -06003247 case ISCSI_PARAM_ABORT_TMO:
3248 sscanf(buf, "%d", &session->abort_timeout);
3249 break;
3250 case ISCSI_PARAM_LU_RESET_TMO:
3251 sscanf(buf, "%d", &session->lu_reset_timeout);
3252 break;
Mike Christie3fe5ae82009-11-11 16:34:33 -06003253 case ISCSI_PARAM_TGT_RESET_TMO:
3254 sscanf(buf, "%d", &session->tgt_reset_timeout);
3255 break;
Mike Christief6d51802007-12-13 12:43:30 -06003256 case ISCSI_PARAM_PING_TMO:
3257 sscanf(buf, "%d", &conn->ping_timeout);
3258 break;
3259 case ISCSI_PARAM_RECV_TMO:
3260 sscanf(buf, "%d", &conn->recv_timeout);
3261 break;
Mike Christiea54a52c2006-06-28 12:00:23 -05003262 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3263 sscanf(buf, "%d", &conn->max_recv_dlength);
3264 break;
3265 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3266 sscanf(buf, "%d", &conn->max_xmit_dlength);
3267 break;
3268 case ISCSI_PARAM_HDRDGST_EN:
3269 sscanf(buf, "%d", &conn->hdrdgst_en);
3270 break;
3271 case ISCSI_PARAM_DATADGST_EN:
3272 sscanf(buf, "%d", &conn->datadgst_en);
3273 break;
3274 case ISCSI_PARAM_INITIAL_R2T_EN:
3275 sscanf(buf, "%d", &session->initial_r2t_en);
3276 break;
3277 case ISCSI_PARAM_MAX_R2T:
Mike Christie1304be52012-01-26 21:13:10 -06003278 sscanf(buf, "%hu", &session->max_r2t);
Mike Christiea54a52c2006-06-28 12:00:23 -05003279 break;
3280 case ISCSI_PARAM_IMM_DATA_EN:
3281 sscanf(buf, "%d", &session->imm_data_en);
3282 break;
3283 case ISCSI_PARAM_FIRST_BURST:
3284 sscanf(buf, "%d", &session->first_burst);
3285 break;
3286 case ISCSI_PARAM_MAX_BURST:
3287 sscanf(buf, "%d", &session->max_burst);
3288 break;
3289 case ISCSI_PARAM_PDU_INORDER_EN:
3290 sscanf(buf, "%d", &session->pdu_inorder_en);
3291 break;
3292 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3293 sscanf(buf, "%d", &session->dataseq_inorder_en);
3294 break;
3295 case ISCSI_PARAM_ERL:
3296 sscanf(buf, "%d", &session->erl);
3297 break;
Mike Christiea54a52c2006-06-28 12:00:23 -05003298 case ISCSI_PARAM_EXP_STATSN:
3299 sscanf(buf, "%u", &conn->exp_statsn);
3300 break;
Mike Christieb2c64162007-05-30 12:57:16 -05003301 case ISCSI_PARAM_USERNAME:
Mike Christie5700b1a2009-05-13 17:57:40 -05003302 return iscsi_switch_str_param(&session->username, buf);
Mike Christieb2c64162007-05-30 12:57:16 -05003303 case ISCSI_PARAM_USERNAME_IN:
Mike Christie5700b1a2009-05-13 17:57:40 -05003304 return iscsi_switch_str_param(&session->username_in, buf);
Mike Christieb2c64162007-05-30 12:57:16 -05003305 case ISCSI_PARAM_PASSWORD:
Mike Christie5700b1a2009-05-13 17:57:40 -05003306 return iscsi_switch_str_param(&session->password, buf);
Mike Christieb2c64162007-05-30 12:57:16 -05003307 case ISCSI_PARAM_PASSWORD_IN:
Mike Christie5700b1a2009-05-13 17:57:40 -05003308 return iscsi_switch_str_param(&session->password_in, buf);
Mike Christiea54a52c2006-06-28 12:00:23 -05003309 case ISCSI_PARAM_TARGET_NAME:
Mike Christie5700b1a2009-05-13 17:57:40 -05003310 return iscsi_switch_str_param(&session->targetname, buf);
Vikas Chaudhary3c5c4802012-01-19 03:06:53 -08003311 case ISCSI_PARAM_TARGET_ALIAS:
3312 return iscsi_switch_str_param(&session->targetalias, buf);
Mike Christiea54a52c2006-06-28 12:00:23 -05003313 case ISCSI_PARAM_TPGT:
3314 sscanf(buf, "%d", &session->tpgt);
3315 break;
3316 case ISCSI_PARAM_PERSISTENT_PORT:
3317 sscanf(buf, "%d", &conn->persistent_port);
3318 break;
3319 case ISCSI_PARAM_PERSISTENT_ADDRESS:
Mike Christie5700b1a2009-05-13 17:57:40 -05003320 return iscsi_switch_str_param(&conn->persistent_address, buf);
Mike Christie88dfd342008-05-21 15:54:16 -05003321 case ISCSI_PARAM_IFACE_NAME:
Mike Christie5700b1a2009-05-13 17:57:40 -05003322 return iscsi_switch_str_param(&session->ifacename, buf);
Mike Christie88dfd342008-05-21 15:54:16 -05003323 case ISCSI_PARAM_INITIATOR_NAME:
Mike Christie5700b1a2009-05-13 17:57:40 -05003324 return iscsi_switch_str_param(&session->initiatorname, buf);
Eddie Wai3b9373e2013-06-20 10:21:26 -07003325 case ISCSI_PARAM_BOOT_ROOT:
3326 return iscsi_switch_str_param(&session->boot_root, buf);
3327 case ISCSI_PARAM_BOOT_NIC:
3328 return iscsi_switch_str_param(&session->boot_nic, buf);
3329 case ISCSI_PARAM_BOOT_TARGET:
3330 return iscsi_switch_str_param(&session->boot_target, buf);
Adheer Chandravanshif8525eb2013-07-01 05:54:12 -04003331 case ISCSI_PARAM_PORTAL_TYPE:
3332 return iscsi_switch_str_param(&session->portal_type, buf);
3333 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE:
3334 return iscsi_switch_str_param(&session->discovery_parent_type,
3335 buf);
Or Gerlitz6a06a4b2013-08-08 13:44:29 +03003336 case ISCSI_PARAM_DISCOVERY_SESS:
3337 sscanf(buf, "%d", &val);
3338 session->discovery_sess = !!val;
3339 break;
Adheer Chandravanshiae56ff42013-11-22 05:28:21 -05003340 case ISCSI_PARAM_LOCAL_IPADDR:
3341 return iscsi_switch_str_param(&conn->local_ipaddr, buf);
Mike Christiea54a52c2006-06-28 12:00:23 -05003342 default:
3343 return -ENOSYS;
3344 }
3345
3346 return 0;
3347}
3348EXPORT_SYMBOL_GPL(iscsi_set_param);
3349
3350int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
3351 enum iscsi_param param, char *buf)
3352{
Mike Christie75613522008-05-21 15:53:59 -05003353 struct iscsi_session *session = cls_session->dd_data;
Mike Christiea54a52c2006-06-28 12:00:23 -05003354 int len;
3355
3356 switch(param) {
Mike Christie843c0a82007-12-13 12:43:20 -06003357 case ISCSI_PARAM_FAST_ABORT:
3358 len = sprintf(buf, "%d\n", session->fast_abort);
3359 break;
Mike Christief6d51802007-12-13 12:43:30 -06003360 case ISCSI_PARAM_ABORT_TMO:
3361 len = sprintf(buf, "%d\n", session->abort_timeout);
3362 break;
3363 case ISCSI_PARAM_LU_RESET_TMO:
3364 len = sprintf(buf, "%d\n", session->lu_reset_timeout);
3365 break;
Mike Christie3fe5ae82009-11-11 16:34:33 -06003366 case ISCSI_PARAM_TGT_RESET_TMO:
3367 len = sprintf(buf, "%d\n", session->tgt_reset_timeout);
3368 break;
Mike Christiea54a52c2006-06-28 12:00:23 -05003369 case ISCSI_PARAM_INITIAL_R2T_EN:
3370 len = sprintf(buf, "%d\n", session->initial_r2t_en);
3371 break;
3372 case ISCSI_PARAM_MAX_R2T:
3373 len = sprintf(buf, "%hu\n", session->max_r2t);
3374 break;
3375 case ISCSI_PARAM_IMM_DATA_EN:
3376 len = sprintf(buf, "%d\n", session->imm_data_en);
3377 break;
3378 case ISCSI_PARAM_FIRST_BURST:
3379 len = sprintf(buf, "%u\n", session->first_burst);
3380 break;
3381 case ISCSI_PARAM_MAX_BURST:
3382 len = sprintf(buf, "%u\n", session->max_burst);
3383 break;
3384 case ISCSI_PARAM_PDU_INORDER_EN:
3385 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
3386 break;
3387 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3388 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
3389 break;
Adheer Chandravanshi5f09e1f2013-07-22 07:46:10 -04003390 case ISCSI_PARAM_DEF_TASKMGMT_TMO:
3391 len = sprintf(buf, "%d\n", session->def_taskmgmt_tmo);
3392 break;
Mike Christiea54a52c2006-06-28 12:00:23 -05003393 case ISCSI_PARAM_ERL:
3394 len = sprintf(buf, "%d\n", session->erl);
3395 break;
3396 case ISCSI_PARAM_TARGET_NAME:
3397 len = sprintf(buf, "%s\n", session->targetname);
3398 break;
Vikas Chaudhary3c5c4802012-01-19 03:06:53 -08003399 case ISCSI_PARAM_TARGET_ALIAS:
3400 len = sprintf(buf, "%s\n", session->targetalias);
3401 break;
Mike Christiea54a52c2006-06-28 12:00:23 -05003402 case ISCSI_PARAM_TPGT:
3403 len = sprintf(buf, "%d\n", session->tpgt);
3404 break;
Mike Christieb2c64162007-05-30 12:57:16 -05003405 case ISCSI_PARAM_USERNAME:
3406 len = sprintf(buf, "%s\n", session->username);
3407 break;
3408 case ISCSI_PARAM_USERNAME_IN:
3409 len = sprintf(buf, "%s\n", session->username_in);
3410 break;
3411 case ISCSI_PARAM_PASSWORD:
3412 len = sprintf(buf, "%s\n", session->password);
3413 break;
3414 case ISCSI_PARAM_PASSWORD_IN:
3415 len = sprintf(buf, "%s\n", session->password_in);
3416 break;
Mike Christie88dfd342008-05-21 15:54:16 -05003417 case ISCSI_PARAM_IFACE_NAME:
3418 len = sprintf(buf, "%s\n", session->ifacename);
3419 break;
3420 case ISCSI_PARAM_INITIATOR_NAME:
Mike Christie5700b1a2009-05-13 17:57:40 -05003421 len = sprintf(buf, "%s\n", session->initiatorname);
Mike Christie88dfd342008-05-21 15:54:16 -05003422 break;
Eddie Wai3b9373e2013-06-20 10:21:26 -07003423 case ISCSI_PARAM_BOOT_ROOT:
3424 len = sprintf(buf, "%s\n", session->boot_root);
3425 break;
3426 case ISCSI_PARAM_BOOT_NIC:
3427 len = sprintf(buf, "%s\n", session->boot_nic);
3428 break;
3429 case ISCSI_PARAM_BOOT_TARGET:
3430 len = sprintf(buf, "%s\n", session->boot_target);
Adheer Chandravanshi9a2307b2013-07-22 07:46:09 -04003431 break;
Adheer Chandravanshif8525eb2013-07-01 05:54:12 -04003432 case ISCSI_PARAM_AUTO_SND_TGT_DISABLE:
3433 len = sprintf(buf, "%u\n", session->auto_snd_tgt_disable);
3434 break;
3435 case ISCSI_PARAM_DISCOVERY_SESS:
3436 len = sprintf(buf, "%u\n", session->discovery_sess);
3437 break;
3438 case ISCSI_PARAM_PORTAL_TYPE:
3439 len = sprintf(buf, "%s\n", session->portal_type);
3440 break;
3441 case ISCSI_PARAM_CHAP_AUTH_EN:
3442 len = sprintf(buf, "%u\n", session->chap_auth_en);
3443 break;
3444 case ISCSI_PARAM_DISCOVERY_LOGOUT_EN:
3445 len = sprintf(buf, "%u\n", session->discovery_logout_en);
3446 break;
3447 case ISCSI_PARAM_BIDI_CHAP_EN:
3448 len = sprintf(buf, "%u\n", session->bidi_chap_en);
3449 break;
3450 case ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL:
3451 len = sprintf(buf, "%u\n", session->discovery_auth_optional);
3452 break;
3453 case ISCSI_PARAM_DEF_TIME2WAIT:
3454 len = sprintf(buf, "%d\n", session->time2wait);
3455 break;
3456 case ISCSI_PARAM_DEF_TIME2RETAIN:
3457 len = sprintf(buf, "%d\n", session->time2retain);
3458 break;
3459 case ISCSI_PARAM_TSID:
3460 len = sprintf(buf, "%u\n", session->tsid);
3461 break;
3462 case ISCSI_PARAM_ISID:
3463 len = sprintf(buf, "%02x%02x%02x%02x%02x%02x\n",
3464 session->isid[0], session->isid[1],
3465 session->isid[2], session->isid[3],
3466 session->isid[4], session->isid[5]);
3467 break;
3468 case ISCSI_PARAM_DISCOVERY_PARENT_IDX:
3469 len = sprintf(buf, "%u\n", session->discovery_parent_idx);
3470 break;
3471 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE:
3472 if (session->discovery_parent_type)
3473 len = sprintf(buf, "%s\n",
3474 session->discovery_parent_type);
3475 else
3476 len = sprintf(buf, "\n");
Eddie Wai3b9373e2013-06-20 10:21:26 -07003477 break;
Mike Christiea54a52c2006-06-28 12:00:23 -05003478 default:
3479 return -ENOSYS;
3480 }
3481
3482 return len;
3483}
3484EXPORT_SYMBOL_GPL(iscsi_session_get_param);
3485
Mike Christie00f37082011-02-16 15:04:35 -06003486int iscsi_conn_get_addr_param(struct sockaddr_storage *addr,
3487 enum iscsi_param param, char *buf)
3488{
3489 struct sockaddr_in6 *sin6 = NULL;
3490 struct sockaddr_in *sin = NULL;
3491 int len;
3492
3493 switch (addr->ss_family) {
3494 case AF_INET:
3495 sin = (struct sockaddr_in *)addr;
3496 break;
3497 case AF_INET6:
3498 sin6 = (struct sockaddr_in6 *)addr;
3499 break;
3500 default:
3501 return -EINVAL;
3502 }
3503
3504 switch (param) {
3505 case ISCSI_PARAM_CONN_ADDRESS:
3506 case ISCSI_HOST_PARAM_IPADDRESS:
3507 if (sin)
3508 len = sprintf(buf, "%pI4\n", &sin->sin_addr.s_addr);
3509 else
3510 len = sprintf(buf, "%pI6\n", &sin6->sin6_addr);
3511 break;
3512 case ISCSI_PARAM_CONN_PORT:
Mike Christie4bfb8ebf2014-09-29 13:55:42 -05003513 case ISCSI_PARAM_LOCAL_PORT:
Mike Christie00f37082011-02-16 15:04:35 -06003514 if (sin)
3515 len = sprintf(buf, "%hu\n", be16_to_cpu(sin->sin_port));
3516 else
3517 len = sprintf(buf, "%hu\n",
3518 be16_to_cpu(sin6->sin6_port));
3519 break;
3520 default:
3521 return -EINVAL;
3522 }
3523
3524 return len;
3525}
3526EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param);
3527
Mike Christiea54a52c2006-06-28 12:00:23 -05003528int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
3529 enum iscsi_param param, char *buf)
3530{
3531 struct iscsi_conn *conn = cls_conn->dd_data;
3532 int len;
3533
3534 switch(param) {
Mike Christief6d51802007-12-13 12:43:30 -06003535 case ISCSI_PARAM_PING_TMO:
3536 len = sprintf(buf, "%u\n", conn->ping_timeout);
3537 break;
3538 case ISCSI_PARAM_RECV_TMO:
3539 len = sprintf(buf, "%u\n", conn->recv_timeout);
3540 break;
Mike Christiea54a52c2006-06-28 12:00:23 -05003541 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3542 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
3543 break;
3544 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3545 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
3546 break;
3547 case ISCSI_PARAM_HDRDGST_EN:
3548 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
3549 break;
3550 case ISCSI_PARAM_DATADGST_EN:
3551 len = sprintf(buf, "%d\n", conn->datadgst_en);
3552 break;
3553 case ISCSI_PARAM_IFMARKER_EN:
3554 len = sprintf(buf, "%d\n", conn->ifmarker_en);
3555 break;
3556 case ISCSI_PARAM_OFMARKER_EN:
3557 len = sprintf(buf, "%d\n", conn->ofmarker_en);
3558 break;
3559 case ISCSI_PARAM_EXP_STATSN:
3560 len = sprintf(buf, "%u\n", conn->exp_statsn);
3561 break;
3562 case ISCSI_PARAM_PERSISTENT_PORT:
3563 len = sprintf(buf, "%d\n", conn->persistent_port);
3564 break;
3565 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3566 len = sprintf(buf, "%s\n", conn->persistent_address);
3567 break;
Adheer Chandravanshif8525eb2013-07-01 05:54:12 -04003568 case ISCSI_PARAM_STATSN:
3569 len = sprintf(buf, "%u\n", conn->statsn);
3570 break;
3571 case ISCSI_PARAM_MAX_SEGMENT_SIZE:
3572 len = sprintf(buf, "%u\n", conn->max_segment_size);
3573 break;
3574 case ISCSI_PARAM_KEEPALIVE_TMO:
3575 len = sprintf(buf, "%u\n", conn->keepalive_tmo);
3576 break;
3577 case ISCSI_PARAM_LOCAL_PORT:
3578 len = sprintf(buf, "%u\n", conn->local_port);
3579 break;
3580 case ISCSI_PARAM_TCP_TIMESTAMP_STAT:
3581 len = sprintf(buf, "%u\n", conn->tcp_timestamp_stat);
3582 break;
3583 case ISCSI_PARAM_TCP_NAGLE_DISABLE:
3584 len = sprintf(buf, "%u\n", conn->tcp_nagle_disable);
3585 break;
3586 case ISCSI_PARAM_TCP_WSF_DISABLE:
3587 len = sprintf(buf, "%u\n", conn->tcp_wsf_disable);
3588 break;
3589 case ISCSI_PARAM_TCP_TIMER_SCALE:
3590 len = sprintf(buf, "%u\n", conn->tcp_timer_scale);
3591 break;
3592 case ISCSI_PARAM_TCP_TIMESTAMP_EN:
3593 len = sprintf(buf, "%u\n", conn->tcp_timestamp_en);
3594 break;
3595 case ISCSI_PARAM_IP_FRAGMENT_DISABLE:
3596 len = sprintf(buf, "%u\n", conn->fragment_disable);
3597 break;
3598 case ISCSI_PARAM_IPV4_TOS:
3599 len = sprintf(buf, "%u\n", conn->ipv4_tos);
3600 break;
3601 case ISCSI_PARAM_IPV6_TC:
3602 len = sprintf(buf, "%u\n", conn->ipv6_traffic_class);
3603 break;
Adheer Chandravanshi5f09e1f2013-07-22 07:46:10 -04003604 case ISCSI_PARAM_IPV6_FLOW_LABEL:
3605 len = sprintf(buf, "%u\n", conn->ipv6_flow_label);
3606 break;
Adheer Chandravanshif8525eb2013-07-01 05:54:12 -04003607 case ISCSI_PARAM_IS_FW_ASSIGNED_IPV6:
3608 len = sprintf(buf, "%u\n", conn->is_fw_assigned_ipv6);
3609 break;
3610 case ISCSI_PARAM_TCP_XMIT_WSF:
3611 len = sprintf(buf, "%u\n", conn->tcp_xmit_wsf);
3612 break;
3613 case ISCSI_PARAM_TCP_RECV_WSF:
3614 len = sprintf(buf, "%u\n", conn->tcp_recv_wsf);
3615 break;
Adheer Chandravanshiae56ff42013-11-22 05:28:21 -05003616 case ISCSI_PARAM_LOCAL_IPADDR:
3617 len = sprintf(buf, "%s\n", conn->local_ipaddr);
3618 break;
Mike Christiea54a52c2006-06-28 12:00:23 -05003619 default:
3620 return -ENOSYS;
3621 }
3622
3623 return len;
3624}
3625EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
3626
Mike Christie0801c242007-05-30 12:57:12 -05003627int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3628 char *buf)
3629{
Mike Christie75613522008-05-21 15:53:59 -05003630 struct iscsi_host *ihost = shost_priv(shost);
Mike Christie0801c242007-05-30 12:57:12 -05003631 int len;
3632
3633 switch (param) {
Mike Christied8196ed2007-05-30 12:57:25 -05003634 case ISCSI_HOST_PARAM_NETDEV_NAME:
Mike Christie5700b1a2009-05-13 17:57:40 -05003635 len = sprintf(buf, "%s\n", ihost->netdev);
Mike Christied8196ed2007-05-30 12:57:25 -05003636 break;
Mike Christie0801c242007-05-30 12:57:12 -05003637 case ISCSI_HOST_PARAM_HWADDRESS:
Mike Christie5700b1a2009-05-13 17:57:40 -05003638 len = sprintf(buf, "%s\n", ihost->hwaddress);
Mike Christie0801c242007-05-30 12:57:12 -05003639 break;
Mike Christie8ad57812007-05-30 12:57:13 -05003640 case ISCSI_HOST_PARAM_INITIATOR_NAME:
Mike Christie5700b1a2009-05-13 17:57:40 -05003641 len = sprintf(buf, "%s\n", ihost->initiatorname);
Mike Christie8ad57812007-05-30 12:57:13 -05003642 break;
Mike Christie0801c242007-05-30 12:57:12 -05003643 default:
3644 return -ENOSYS;
3645 }
3646
3647 return len;
3648}
3649EXPORT_SYMBOL_GPL(iscsi_host_get_param);
3650
3651int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3652 char *buf, int buflen)
3653{
Mike Christie75613522008-05-21 15:53:59 -05003654 struct iscsi_host *ihost = shost_priv(shost);
Mike Christie0801c242007-05-30 12:57:12 -05003655
3656 switch (param) {
Mike Christied8196ed2007-05-30 12:57:25 -05003657 case ISCSI_HOST_PARAM_NETDEV_NAME:
Mike Christie5700b1a2009-05-13 17:57:40 -05003658 return iscsi_switch_str_param(&ihost->netdev, buf);
Mike Christie0801c242007-05-30 12:57:12 -05003659 case ISCSI_HOST_PARAM_HWADDRESS:
Mike Christie5700b1a2009-05-13 17:57:40 -05003660 return iscsi_switch_str_param(&ihost->hwaddress, buf);
Mike Christie8ad57812007-05-30 12:57:13 -05003661 case ISCSI_HOST_PARAM_INITIATOR_NAME:
Mike Christie5700b1a2009-05-13 17:57:40 -05003662 return iscsi_switch_str_param(&ihost->initiatorname, buf);
Mike Christie0801c242007-05-30 12:57:12 -05003663 default:
3664 return -ENOSYS;
3665 }
3666
3667 return 0;
3668}
3669EXPORT_SYMBOL_GPL(iscsi_host_set_param);
3670
Mike Christie7996a772006-04-06 21:13:41 -05003671MODULE_AUTHOR("Mike Christie");
3672MODULE_DESCRIPTION("iSCSI library functions");
3673MODULE_LICENSE("GPL");