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Mike Christie7996a772006-04-06 21:13:41 -05001/*
2 * iSCSI lib functions
3 *
4 * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
5 * Copyright (C) 2004 - 2006 Mike Christie
6 * Copyright (C) 2004 - 2005 Dmitry Yusupov
7 * Copyright (C) 2004 - 2005 Alex Aizman
8 * maintained by open-iscsi@googlegroups.com
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 */
24#include <linux/types.h>
Mike Christie7996a772006-04-06 21:13:41 -050025#include <linux/kfifo.h>
26#include <linux/delay.h>
vignesh babu11836572007-12-13 12:43:41 -060027#include <linux/log2.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090028#include <linux/slab.h>
Paul Gortmakeracf3368f2011-05-27 09:47:43 -040029#include <linux/module.h>
Mike Christie8eb00532007-02-28 17:32:19 -060030#include <asm/unaligned.h>
Mike Christie7996a772006-04-06 21:13:41 -050031#include <net/tcp.h>
32#include <scsi/scsi_cmnd.h>
33#include <scsi/scsi_device.h>
34#include <scsi/scsi_eh.h>
35#include <scsi/scsi_tcq.h>
36#include <scsi/scsi_host.h>
37#include <scsi/scsi.h>
38#include <scsi/iscsi_proto.h>
39#include <scsi/scsi_transport.h>
40#include <scsi/scsi_transport_iscsi.h>
41#include <scsi/libiscsi.h>
42
Erez Zilberbd2199d2009-06-15 22:11:10 -050043static int iscsi_dbg_lib_conn;
44module_param_named(debug_libiscsi_conn, iscsi_dbg_lib_conn, int,
45 S_IRUGO | S_IWUSR);
46MODULE_PARM_DESC(debug_libiscsi_conn,
47 "Turn on debugging for connections in libiscsi module. "
48 "Set to 1 to turn on, and zero to turn off. Default is off.");
49
50static int iscsi_dbg_lib_session;
51module_param_named(debug_libiscsi_session, iscsi_dbg_lib_session, int,
52 S_IRUGO | S_IWUSR);
53MODULE_PARM_DESC(debug_libiscsi_session,
54 "Turn on debugging for sessions in libiscsi module. "
55 "Set to 1 to turn on, and zero to turn off. Default is off.");
56
57static int iscsi_dbg_lib_eh;
58module_param_named(debug_libiscsi_eh, iscsi_dbg_lib_eh, int,
59 S_IRUGO | S_IWUSR);
60MODULE_PARM_DESC(debug_libiscsi_eh,
61 "Turn on debugging for error handling in libiscsi module. "
62 "Set to 1 to turn on, and zero to turn off. Default is off.");
Mike Christie1b2c7af2009-03-05 14:45:58 -060063
64#define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \
65 do { \
Erez Zilberbd2199d2009-06-15 22:11:10 -050066 if (iscsi_dbg_lib_conn) \
Mike Christie1b2c7af2009-03-05 14:45:58 -060067 iscsi_conn_printk(KERN_INFO, _conn, \
68 "%s " dbg_fmt, \
69 __func__, ##arg); \
70 } while (0);
71
72#define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \
73 do { \
Erez Zilberbd2199d2009-06-15 22:11:10 -050074 if (iscsi_dbg_lib_session) \
75 iscsi_session_printk(KERN_INFO, _session, \
76 "%s " dbg_fmt, \
77 __func__, ##arg); \
78 } while (0);
79
80#define ISCSI_DBG_EH(_session, dbg_fmt, arg...) \
81 do { \
82 if (iscsi_dbg_lib_eh) \
Mike Christie1b2c7af2009-03-05 14:45:58 -060083 iscsi_session_printk(KERN_INFO, _session, \
84 "%s " dbg_fmt, \
85 __func__, ##arg); \
86 } while (0);
87
Mike Christie32ae7632009-03-05 14:46:03 -060088inline void iscsi_conn_queue_work(struct iscsi_conn *conn)
89{
90 struct Scsi_Host *shost = conn->session->host;
91 struct iscsi_host *ihost = shost_priv(shost);
92
Mike Christie1336aed2009-05-13 17:57:48 -050093 if (ihost->workq)
94 queue_work(ihost->workq, &conn->xmitwork);
Mike Christie32ae7632009-03-05 14:46:03 -060095}
96EXPORT_SYMBOL_GPL(iscsi_conn_queue_work);
97
Mike Christie4c0ba5d2009-09-05 07:34:23 +053098static void __iscsi_update_cmdsn(struct iscsi_session *session,
99 uint32_t exp_cmdsn, uint32_t max_cmdsn)
Mike Christie7996a772006-04-06 21:13:41 -0500100{
Mike Christie77a23c22007-05-30 12:57:18 -0500101 /*
102 * standard specifies this check for when to update expected and
103 * max sequence numbers
104 */
105 if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1))
106 return;
107
108 if (exp_cmdsn != session->exp_cmdsn &&
109 !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn))
Mike Christie7996a772006-04-06 21:13:41 -0500110 session->exp_cmdsn = exp_cmdsn;
111
Mike Christie77a23c22007-05-30 12:57:18 -0500112 if (max_cmdsn != session->max_cmdsn &&
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,
286 "task [op %x/%x itt "
Mike Christie3fe5ae82009-11-11 16:34:33 -0600287 "0x%x/0x%x] "
Mike Christie5d12c052009-11-11 16:34:32 -0600288 "rejected.\n",
289 task->hdr->opcode, opcode,
Mike Christie3fe5ae82009-11-11 16:34:33 -0600290 task->itt, 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,
299 "task [op %x/%x itt "
Mike Christie3fe5ae82009-11-11 16:34:33 -0600300 "0x%x/0x%x] fast abort.\n",
Mike Christie5d12c052009-11-11 16:34:32 -0600301 task->hdr->opcode, opcode,
Mike Christie3fe5ae82009-11-11 16:34:33 -0600302 task->itt, 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:
Mike Christie9000bcd2007-12-13 12:43:32 -06001698 case ISCSI_STATE_IN_RECOVERY:
Mike Christie656cffc2006-05-18 20:31:42 -05001699 reason = FAILURE_SESSION_IN_RECOVERY;
Mike Christie301e0f72009-05-13 17:57:47 -05001700 sc->result = DID_IMM_RETRY << 16;
1701 break;
Mike Christie9000bcd2007-12-13 12:43:32 -06001702 case ISCSI_STATE_LOGGING_OUT:
1703 reason = FAILURE_SESSION_LOGGING_OUT;
Mike Christie301e0f72009-05-13 17:57:47 -05001704 sc->result = DID_IMM_RETRY << 16;
1705 break;
Mike Christieb3a7ea82007-12-13 12:43:26 -06001706 case ISCSI_STATE_RECOVERY_FAILED:
Mike Christie656cffc2006-05-18 20:31:42 -05001707 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
Mike Christie56d7fcf2008-08-19 18:45:26 -05001708 sc->result = DID_TRANSPORT_FAILFAST << 16;
Mike Christieb3a7ea82007-12-13 12:43:26 -06001709 break;
1710 case ISCSI_STATE_TERMINATE:
Mike Christie656cffc2006-05-18 20:31:42 -05001711 reason = FAILURE_SESSION_TERMINATE;
Mike Christie6eabafb2008-01-31 13:36:43 -06001712 sc->result = DID_NO_CONNECT << 16;
Mike Christieb3a7ea82007-12-13 12:43:26 -06001713 break;
Mike Christieb3a7ea82007-12-13 12:43:26 -06001714 default:
Mike Christie656cffc2006-05-18 20:31:42 -05001715 reason = FAILURE_SESSION_FREED;
Mike Christie6eabafb2008-01-31 13:36:43 -06001716 sc->result = DID_NO_CONNECT << 16;
Mike Christieb3a7ea82007-12-13 12:43:26 -06001717 }
Mike Christie7996a772006-04-06 21:13:41 -05001718 goto fault;
1719 }
1720
Mike Christie7996a772006-04-06 21:13:41 -05001721 conn = session->leadconn;
Mike Christie98644042006-10-16 18:09:39 -04001722 if (!conn) {
1723 reason = FAILURE_SESSION_FREED;
Mike Christie6eabafb2008-01-31 13:36:43 -06001724 sc->result = DID_NO_CONNECT << 16;
Mike Christie98644042006-10-16 18:09:39 -04001725 goto fault;
1726 }
Mike Christie7996a772006-04-06 21:13:41 -05001727
Mike Christie661134a2009-09-05 07:35:33 +05301728 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1729 reason = FAILURE_SESSION_IN_RECOVERY;
1730 sc->result = DID_REQUEUE;
1731 goto fault;
1732 }
1733
Mike Christie77a23c22007-05-30 12:57:18 -05001734 if (iscsi_check_cmdsn_window_closed(conn)) {
1735 reason = FAILURE_WINDOW_CLOSED;
1736 goto reject;
1737 }
1738
Mike Christie577577d2008-12-02 00:32:05 -06001739 task = iscsi_alloc_task(conn, sc);
1740 if (!task) {
Mike Christie60ecebf2006-08-31 18:09:25 -04001741 reason = FAILURE_OOM;
1742 goto reject;
1743 }
Mike Christie7996a772006-04-06 21:13:41 -05001744
Mike Christie1336aed2009-05-13 17:57:48 -05001745 if (!ihost->workq) {
Mike Christie577577d2008-12-02 00:32:05 -06001746 reason = iscsi_prep_scsi_cmd_pdu(task);
1747 if (reason) {
Mike Christie5d12c052009-11-11 16:34:32 -06001748 if (reason == -ENOMEM || reason == -EACCES) {
Mike Christie577577d2008-12-02 00:32:05 -06001749 reason = FAILURE_OOM;
1750 goto prepd_reject;
1751 } else {
1752 sc->result = DID_ABORT << 16;
1753 goto prepd_fault;
1754 }
Mike Christie052d0142008-05-21 15:54:05 -05001755 }
Mike Christie9c19a7d2008-05-21 15:54:09 -05001756 if (session->tt->xmit_task(task)) {
Mike Christied3305f32009-08-20 15:10:58 -05001757 session->cmdsn--;
Mike Christie052d0142008-05-21 15:54:05 -05001758 reason = FAILURE_SESSION_NOT_READY;
Mike Christie577577d2008-12-02 00:32:05 -06001759 goto prepd_reject;
Mike Christie052d0142008-05-21 15:54:05 -05001760 }
Mike Christie3bbaaad2009-05-13 17:57:46 -05001761 } else {
Chris Leechde1ff842017-02-27 16:58:36 -08001762 spin_lock_bh(&conn->taskqueuelock);
Mike Christie3bbaaad2009-05-13 17:57:46 -05001763 list_add_tail(&task->running, &conn->cmdqueue);
Chris Leechde1ff842017-02-27 16:58:36 -08001764 spin_unlock_bh(&conn->taskqueuelock);
Mike Christie32ae7632009-03-05 14:46:03 -06001765 iscsi_conn_queue_work(conn);
Mike Christie3bbaaad2009-05-13 17:57:46 -05001766 }
Mike Christie052d0142008-05-21 15:54:05 -05001767
1768 session->queued_cmdsn++;
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001769 spin_unlock_bh(&session->frwd_lock);
Mike Christie7996a772006-04-06 21:13:41 -05001770 return 0;
1771
Mike Christie577577d2008-12-02 00:32:05 -06001772prepd_reject:
Mike Christief41d4722010-12-31 02:22:21 -06001773 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
Mike Christie7996a772006-04-06 21:13:41 -05001774reject:
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001775 spin_unlock_bh(&session->frwd_lock);
Mike Christie1b2c7af2009-03-05 14:45:58 -06001776 ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n",
1777 sc->cmnd[0], reason);
Mike Christied6d13ee2008-08-17 15:24:43 -05001778 return SCSI_MLQUEUE_TARGET_BUSY;
Mike Christie7996a772006-04-06 21:13:41 -05001779
Mike Christie577577d2008-12-02 00:32:05 -06001780prepd_fault:
Mike Christief41d4722010-12-31 02:22:21 -06001781 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
Mike Christie7996a772006-04-06 21:13:41 -05001782fault:
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001783 spin_unlock_bh(&session->frwd_lock);
Mike Christie1b2c7af2009-03-05 14:45:58 -06001784 ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n",
1785 sc->cmnd[0], reason);
Boaz Harroshc07d4442008-04-18 10:11:52 -05001786 if (!scsi_bidi_cmnd(sc))
1787 scsi_set_resid(sc, scsi_bufflen(sc));
1788 else {
1789 scsi_out(sc)->resid = scsi_out(sc)->length;
1790 scsi_in(sc)->resid = scsi_in(sc)->length;
1791 }
Mike Christief41d4722010-12-31 02:22:21 -06001792 sc->scsi_done(sc);
Mike Christie7996a772006-04-06 21:13:41 -05001793 return 0;
1794}
1795EXPORT_SYMBOL_GPL(iscsi_queuecommand);
1796
Mike Christie6b5d6c42009-04-21 15:32:32 -05001797int iscsi_target_alloc(struct scsi_target *starget)
1798{
1799 struct iscsi_cls_session *cls_session = starget_to_session(starget);
1800 struct iscsi_session *session = cls_session->dd_data;
1801
1802 starget->can_queue = session->scsi_cmds_max;
1803 return 0;
1804}
1805EXPORT_SYMBOL_GPL(iscsi_target_alloc);
1806
Mike Christie843c0a82007-12-13 12:43:20 -06001807static void iscsi_tmf_timedout(unsigned long data)
Mike Christie7996a772006-04-06 21:13:41 -05001808{
Mike Christie843c0a82007-12-13 12:43:20 -06001809 struct iscsi_conn *conn = (struct iscsi_conn *)data;
Mike Christie7996a772006-04-06 21:13:41 -05001810 struct iscsi_session *session = conn->session;
1811
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001812 spin_lock(&session->frwd_lock);
Mike Christie843c0a82007-12-13 12:43:20 -06001813 if (conn->tmf_state == TMF_QUEUED) {
1814 conn->tmf_state = TMF_TIMEDOUT;
Erez Zilberbd2199d2009-06-15 22:11:10 -05001815 ISCSI_DBG_EH(session, "tmf timedout\n");
Mike Christie7996a772006-04-06 21:13:41 -05001816 /* unblock eh_abort() */
1817 wake_up(&conn->ehwait);
1818 }
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001819 spin_unlock(&session->frwd_lock);
Mike Christie7996a772006-04-06 21:13:41 -05001820}
1821
Mike Christie9c19a7d2008-05-21 15:54:09 -05001822static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
Mike Christief6d51802007-12-13 12:43:30 -06001823 struct iscsi_tm *hdr, int age,
1824 int timeout)
Mike Christie7996a772006-04-06 21:13:41 -05001825{
Mike Christie7996a772006-04-06 21:13:41 -05001826 struct iscsi_session *session = conn->session;
Mike Christie9c19a7d2008-05-21 15:54:09 -05001827 struct iscsi_task *task;
Mike Christie7996a772006-04-06 21:13:41 -05001828
Mike Christie9c19a7d2008-05-21 15:54:09 -05001829 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
Mike Christie843c0a82007-12-13 12:43:20 -06001830 NULL, 0);
Mike Christie9c19a7d2008-05-21 15:54:09 -05001831 if (!task) {
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001832 spin_unlock_bh(&session->frwd_lock);
Mike Christiedf4da5c2010-12-31 02:22:18 -06001833 iscsi_conn_printk(KERN_ERR, conn, "Could not send TMF.\n");
Mike Christie7996a772006-04-06 21:13:41 -05001834 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001835 spin_lock_bh(&session->frwd_lock);
Mike Christie77a23c22007-05-30 12:57:18 -05001836 return -EPERM;
Mike Christie7996a772006-04-06 21:13:41 -05001837 }
Mike Christie843c0a82007-12-13 12:43:20 -06001838 conn->tmfcmd_pdus_cnt++;
Mike Christief6d51802007-12-13 12:43:30 -06001839 conn->tmf_timer.expires = timeout * HZ + jiffies;
Mike Christie843c0a82007-12-13 12:43:20 -06001840 conn->tmf_timer.function = iscsi_tmf_timedout;
1841 conn->tmf_timer.data = (unsigned long)conn;
1842 add_timer(&conn->tmf_timer);
Erez Zilberbd2199d2009-06-15 22:11:10 -05001843 ISCSI_DBG_EH(session, "tmf set timeout\n");
Mike Christie7996a772006-04-06 21:13:41 -05001844
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001845 spin_unlock_bh(&session->frwd_lock);
Mike Christie6724add2007-08-15 01:38:30 -05001846 mutex_unlock(&session->eh_mutex);
Mike Christie7996a772006-04-06 21:13:41 -05001847
1848 /*
1849 * block eh thread until:
1850 *
Mike Christie843c0a82007-12-13 12:43:20 -06001851 * 1) tmf response
1852 * 2) tmf timeout
Mike Christie7996a772006-04-06 21:13:41 -05001853 * 3) session is terminated or restarted or userspace has
1854 * given up on recovery
1855 */
Mike Christie843c0a82007-12-13 12:43:20 -06001856 wait_event_interruptible(conn->ehwait, age != session->age ||
Mike Christie7996a772006-04-06 21:13:41 -05001857 session->state != ISCSI_STATE_LOGGED_IN ||
Mike Christie843c0a82007-12-13 12:43:20 -06001858 conn->tmf_state != TMF_QUEUED);
Mike Christie7996a772006-04-06 21:13:41 -05001859 if (signal_pending(current))
1860 flush_signals(current);
Mike Christie843c0a82007-12-13 12:43:20 -06001861 del_timer_sync(&conn->tmf_timer);
1862
Mike Christie6724add2007-08-15 01:38:30 -05001863 mutex_lock(&session->eh_mutex);
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001864 spin_lock_bh(&session->frwd_lock);
Mike Christie9c19a7d2008-05-21 15:54:09 -05001865 /* if the session drops it will clean up the task */
Mike Christie843c0a82007-12-13 12:43:20 -06001866 if (age != session->age ||
1867 session->state != ISCSI_STATE_LOGGED_IN)
1868 return -ENOTCONN;
Mike Christie7996a772006-04-06 21:13:41 -05001869 return 0;
1870}
1871
1872/*
Mike Christie843c0a82007-12-13 12:43:20 -06001873 * Fail commands. session lock held and recv side suspended and xmit
1874 * thread flushed
1875 */
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001876static void fail_scsi_tasks(struct iscsi_conn *conn, u64 lun, int error)
Mike Christie843c0a82007-12-13 12:43:20 -06001877{
Mike Christie3bbaaad2009-05-13 17:57:46 -05001878 struct iscsi_task *task;
1879 int i;
Mike Christie843c0a82007-12-13 12:43:20 -06001880
Mike Christie3bbaaad2009-05-13 17:57:46 -05001881 for (i = 0; i < conn->session->cmds_max; i++) {
1882 task = conn->session->cmds[i];
1883 if (!task->sc || task->state == ISCSI_TASK_FREE)
1884 continue;
Mike Christie843c0a82007-12-13 12:43:20 -06001885
Mike Christie3bbaaad2009-05-13 17:57:46 -05001886 if (lun != -1 && lun != task->sc->device->lun)
1887 continue;
Mike Christie843c0a82007-12-13 12:43:20 -06001888
Mike Christie3bbaaad2009-05-13 17:57:46 -05001889 ISCSI_DBG_SESSION(conn->session,
1890 "failing sc %p itt 0x%x state %d\n",
1891 task->sc, task->itt, task->state);
Mike Christieb3cd5052009-05-13 17:57:49 -05001892 fail_scsi_task(task, error);
Mike Christie843c0a82007-12-13 12:43:20 -06001893 }
1894}
1895
Mike Christie661134a2009-09-05 07:35:33 +05301896/**
1897 * iscsi_suspend_queue - suspend iscsi_queuecommand
1898 * @conn: iscsi conn to stop queueing IO on
1899 *
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001900 * This grabs the session frwd_lock to make sure no one is in
Mike Christie661134a2009-09-05 07:35:33 +05301901 * xmit_task/queuecommand, and then sets suspend to prevent
1902 * new commands from being queued. This only needs to be called
1903 * by offload drivers that need to sync a path like ep disconnect
1904 * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi
1905 * will call iscsi_start_tx and iscsi_unblock_session when in FFP.
1906 */
1907void iscsi_suspend_queue(struct iscsi_conn *conn)
1908{
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001909 spin_lock_bh(&conn->session->frwd_lock);
Mike Christie661134a2009-09-05 07:35:33 +05301910 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001911 spin_unlock_bh(&conn->session->frwd_lock);
Mike Christie661134a2009-09-05 07:35:33 +05301912}
1913EXPORT_SYMBOL_GPL(iscsi_suspend_queue);
1914
1915/**
1916 * iscsi_suspend_tx - suspend iscsi_data_xmit
1917 * @conn: iscsi conn tp stop processing IO on.
1918 *
1919 * This function sets the suspend bit to prevent iscsi_data_xmit
1920 * from sending new IO, and if work is queued on the xmit thread
1921 * it will wait for it to be completed.
1922 */
Mike Christieb40977d2008-05-21 15:54:03 -05001923void iscsi_suspend_tx(struct iscsi_conn *conn)
Mike Christie6724add2007-08-15 01:38:30 -05001924{
Mike Christie32ae7632009-03-05 14:46:03 -06001925 struct Scsi_Host *shost = conn->session->host;
1926 struct iscsi_host *ihost = shost_priv(shost);
1927
Mike Christie6724add2007-08-15 01:38:30 -05001928 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
Mike Christie1336aed2009-05-13 17:57:48 -05001929 if (ihost->workq)
Mike Christie32ae7632009-03-05 14:46:03 -06001930 flush_workqueue(ihost->workq);
Mike Christie6724add2007-08-15 01:38:30 -05001931}
Mike Christieb40977d2008-05-21 15:54:03 -05001932EXPORT_SYMBOL_GPL(iscsi_suspend_tx);
Mike Christie6724add2007-08-15 01:38:30 -05001933
1934static void iscsi_start_tx(struct iscsi_conn *conn)
1935{
1936 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
Mike Christie1336aed2009-05-13 17:57:48 -05001937 iscsi_conn_queue_work(conn);
Mike Christie6724add2007-08-15 01:38:30 -05001938}
1939
Mike Christie4c48a822009-05-13 17:57:45 -05001940/*
1941 * We want to make sure a ping is in flight. It has timed out.
1942 * And we are not busy processing a pdu that is making
1943 * progress but got started before the ping and is taking a while
1944 * to complete so the ping is just stuck behind it in a queue.
1945 */
1946static int iscsi_has_ping_timed_out(struct iscsi_conn *conn)
1947{
1948 if (conn->ping_task &&
1949 time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
1950 (conn->ping_timeout * HZ), jiffies))
1951 return 1;
1952 else
1953 return 0;
1954}
1955
Mike Christied355e572009-06-15 22:11:08 -05001956static enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc)
Mike Christief6d51802007-12-13 12:43:30 -06001957{
Mike Christied355e572009-06-15 22:11:08 -05001958 enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED;
Mike Christie92ed4d62010-02-10 16:51:45 -06001959 struct iscsi_task *task = NULL, *running_task;
Mike Christief6d51802007-12-13 12:43:30 -06001960 struct iscsi_cls_session *cls_session;
1961 struct iscsi_session *session;
1962 struct iscsi_conn *conn;
Mike Christie92ed4d62010-02-10 16:51:45 -06001963 int i;
Mike Christief6d51802007-12-13 12:43:30 -06001964
Mike Christied355e572009-06-15 22:11:08 -05001965 cls_session = starget_to_session(scsi_target(sc->device));
Mike Christie75613522008-05-21 15:53:59 -05001966 session = cls_session->dd_data;
Mike Christief6d51802007-12-13 12:43:30 -06001967
Erez Zilberbd2199d2009-06-15 22:11:10 -05001968 ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc);
Mike Christief6d51802007-12-13 12:43:30 -06001969
Shlomo Pongratz659743b2014-02-07 00:41:38 -06001970 spin_lock(&session->frwd_lock);
Mike Christiee3d338a2012-01-26 21:13:11 -06001971 task = (struct iscsi_task *)sc->SCp.ptr;
1972 if (!task) {
1973 /*
1974 * Raced with completion. Blk layer has taken ownership
1975 * so let timeout code complete it now.
1976 */
1977 rc = BLK_EH_HANDLED;
1978 goto done;
1979 }
1980
Mike Christief6d51802007-12-13 12:43:30 -06001981 if (session->state != ISCSI_STATE_LOGGED_IN) {
1982 /*
1983 * We are probably in the middle of iscsi recovery so let
1984 * that complete and handle the error.
1985 */
Jens Axboe242f9dc2008-09-14 05:55:09 -07001986 rc = BLK_EH_RESET_TIMER;
Mike Christief6d51802007-12-13 12:43:30 -06001987 goto done;
1988 }
1989
1990 conn = session->leadconn;
1991 if (!conn) {
1992 /* In the middle of shuting down */
Jens Axboe242f9dc2008-09-14 05:55:09 -07001993 rc = BLK_EH_RESET_TIMER;
Mike Christief6d51802007-12-13 12:43:30 -06001994 goto done;
1995 }
1996
Mike Christied355e572009-06-15 22:11:08 -05001997 /*
1998 * If we have sent (at least queued to the network layer) a pdu or
1999 * recvd one for the task since the last timeout ask for
2000 * more time. If on the next timeout we have not made progress
2001 * we can check if it is the task or connection when we send the
2002 * nop as a ping.
2003 */
Mike Christie92ed4d62010-02-10 16:51:45 -06002004 if (time_after(task->last_xfer, task->last_timeout)) {
Erez Zilberbd2199d2009-06-15 22:11:10 -05002005 ISCSI_DBG_EH(session, "Command making progress. Asking "
2006 "scsi-ml for more time to complete. "
Mike Christie92ed4d62010-02-10 16:51:45 -06002007 "Last data xfer at %lu. Last timeout was at "
Erez Zilberbd2199d2009-06-15 22:11:10 -05002008 "%lu\n.", task->last_xfer, task->last_timeout);
Mike Christied355e572009-06-15 22:11:08 -05002009 task->have_checked_conn = false;
2010 rc = BLK_EH_RESET_TIMER;
2011 goto done;
2012 }
2013
Mike Christief6d51802007-12-13 12:43:30 -06002014 if (!conn->recv_timeout && !conn->ping_timeout)
2015 goto done;
2016 /*
2017 * if the ping timedout then we are in the middle of cleaning up
2018 * and can let the iscsi eh handle it
2019 */
Mike Christie4c48a822009-05-13 17:57:45 -05002020 if (iscsi_has_ping_timed_out(conn)) {
Jens Axboe242f9dc2008-09-14 05:55:09 -07002021 rc = BLK_EH_RESET_TIMER;
Mike Christie4c48a822009-05-13 17:57:45 -05002022 goto done;
2023 }
Mike Christied355e572009-06-15 22:11:08 -05002024
Mike Christie92ed4d62010-02-10 16:51:45 -06002025 for (i = 0; i < conn->session->cmds_max; i++) {
2026 running_task = conn->session->cmds[i];
2027 if (!running_task->sc || running_task == task ||
2028 running_task->state != ISCSI_TASK_RUNNING)
2029 continue;
2030
2031 /*
2032 * Only check if cmds started before this one have made
2033 * progress, or this could never fail
2034 */
2035 if (time_after(running_task->sc->jiffies_at_alloc,
2036 task->sc->jiffies_at_alloc))
2037 continue;
2038
2039 if (time_after(running_task->last_xfer, task->last_timeout)) {
2040 /*
2041 * This task has not made progress, but a task
2042 * started before us has transferred data since
2043 * we started/last-checked. We could be queueing
2044 * too many tasks or the LU is bad.
2045 *
2046 * If the device is bad the cmds ahead of us on
2047 * other devs will complete, and this loop will
2048 * eventually fail starting the scsi eh.
2049 */
2050 ISCSI_DBG_EH(session, "Command has not made progress "
2051 "but commands ahead of it have. "
2052 "Asking scsi-ml for more time to "
2053 "complete. Our last xfer vs running task "
2054 "last xfer %lu/%lu. Last check %lu.\n",
2055 task->last_xfer, running_task->last_xfer,
2056 task->last_timeout);
2057 rc = BLK_EH_RESET_TIMER;
2058 goto done;
2059 }
2060 }
2061
Mike Christied355e572009-06-15 22:11:08 -05002062 /* Assumes nop timeout is shorter than scsi cmd timeout */
2063 if (task->have_checked_conn)
2064 goto done;
2065
Mike Christief6d51802007-12-13 12:43:30 -06002066 /*
Mike Christied355e572009-06-15 22:11:08 -05002067 * Checking the transport already or nop from a cmd timeout still
2068 * running
Mike Christief6d51802007-12-13 12:43:30 -06002069 */
Mike Christied355e572009-06-15 22:11:08 -05002070 if (conn->ping_task) {
2071 task->have_checked_conn = true;
Jens Axboe242f9dc2008-09-14 05:55:09 -07002072 rc = BLK_EH_RESET_TIMER;
Mike Christie4c48a822009-05-13 17:57:45 -05002073 goto done;
2074 }
2075
Mike Christied355e572009-06-15 22:11:08 -05002076 /* Make sure there is a transport check done */
2077 iscsi_send_nopout(conn, NULL);
2078 task->have_checked_conn = true;
2079 rc = BLK_EH_RESET_TIMER;
2080
Mike Christief6d51802007-12-13 12:43:30 -06002081done:
Mike Christied355e572009-06-15 22:11:08 -05002082 if (task)
2083 task->last_timeout = jiffies;
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002084 spin_unlock(&session->frwd_lock);
Erez Zilberbd2199d2009-06-15 22:11:10 -05002085 ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ?
2086 "timer reset" : "nh");
Mike Christief6d51802007-12-13 12:43:30 -06002087 return rc;
2088}
2089
2090static void iscsi_check_transport_timeouts(unsigned long data)
2091{
2092 struct iscsi_conn *conn = (struct iscsi_conn *)data;
2093 struct iscsi_session *session = conn->session;
Mike Christie4cf10432008-05-07 20:43:52 -05002094 unsigned long recv_timeout, next_timeout = 0, last_recv;
Mike Christief6d51802007-12-13 12:43:30 -06002095
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002096 spin_lock(&session->frwd_lock);
Mike Christief6d51802007-12-13 12:43:30 -06002097 if (session->state != ISCSI_STATE_LOGGED_IN)
2098 goto done;
2099
Mike Christie4cf10432008-05-07 20:43:52 -05002100 recv_timeout = conn->recv_timeout;
2101 if (!recv_timeout)
Mike Christief6d51802007-12-13 12:43:30 -06002102 goto done;
2103
Mike Christie4cf10432008-05-07 20:43:52 -05002104 recv_timeout *= HZ;
Mike Christief6d51802007-12-13 12:43:30 -06002105 last_recv = conn->last_recv;
Mike Christie4c48a822009-05-13 17:57:45 -05002106
2107 if (iscsi_has_ping_timed_out(conn)) {
Mike Christie322d7392008-01-31 13:36:52 -06002108 iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs "
Mike Christie4c48a822009-05-13 17:57:45 -05002109 "expired, recv timeout %d, last rx %lu, "
2110 "last ping %lu, now %lu\n",
2111 conn->ping_timeout, conn->recv_timeout,
2112 last_recv, conn->last_ping, jiffies);
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002113 spin_unlock(&session->frwd_lock);
Mike Christie09ff7422014-07-12 15:51:51 -05002114 iscsi_conn_failure(conn, ISCSI_ERR_NOP_TIMEDOUT);
Mike Christief6d51802007-12-13 12:43:30 -06002115 return;
2116 }
2117
Mike Christie4cf10432008-05-07 20:43:52 -05002118 if (time_before_eq(last_recv + recv_timeout, jiffies)) {
Mike Christiec8611f92008-05-08 20:15:34 -05002119 /* send a ping to try to provoke some traffic */
Mike Christie1b2c7af2009-03-05 14:45:58 -06002120 ISCSI_DBG_CONN(conn, "Sending nopout as ping\n");
Ariel Nahum52f56642015-09-03 19:49:55 +03002121 if (iscsi_send_nopout(conn, NULL))
2122 next_timeout = jiffies + (1 * HZ);
2123 else
2124 next_timeout = conn->last_ping + (conn->ping_timeout * HZ);
Mike Christiead294e92008-01-31 13:36:50 -06002125 } else
Mike Christie4cf10432008-05-07 20:43:52 -05002126 next_timeout = last_recv + recv_timeout;
Mike Christief6d51802007-12-13 12:43:30 -06002127
Mike Christie1b2c7af2009-03-05 14:45:58 -06002128 ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout);
Mike Christiead294e92008-01-31 13:36:50 -06002129 mod_timer(&conn->transport_timer, next_timeout);
Mike Christief6d51802007-12-13 12:43:30 -06002130done:
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002131 spin_unlock(&session->frwd_lock);
Mike Christief6d51802007-12-13 12:43:30 -06002132}
2133
Mike Christie9c19a7d2008-05-21 15:54:09 -05002134static void iscsi_prep_abort_task_pdu(struct iscsi_task *task,
Mike Christie843c0a82007-12-13 12:43:20 -06002135 struct iscsi_tm *hdr)
2136{
2137 memset(hdr, 0, sizeof(*hdr));
2138 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2139 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
2140 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
Andy Grover55bdabd2011-06-16 15:57:09 -07002141 hdr->lun = task->lun;
Mike Christie577577d2008-12-02 00:32:05 -06002142 hdr->rtt = task->hdr_itt;
2143 hdr->refcmdsn = task->cmdsn;
Mike Christie843c0a82007-12-13 12:43:20 -06002144}
2145
Mike Christie7996a772006-04-06 21:13:41 -05002146int iscsi_eh_abort(struct scsi_cmnd *sc)
2147{
Mike Christie75613522008-05-21 15:53:59 -05002148 struct iscsi_cls_session *cls_session;
2149 struct iscsi_session *session;
Mike Christief47f2cf2006-08-31 18:09:33 -04002150 struct iscsi_conn *conn;
Mike Christie9c19a7d2008-05-21 15:54:09 -05002151 struct iscsi_task *task;
Mike Christie843c0a82007-12-13 12:43:20 -06002152 struct iscsi_tm *hdr;
Bart Van Asschee9e410e2016-03-30 11:27:08 -07002153 int age;
Mike Christie7996a772006-04-06 21:13:41 -05002154
Mike Christie75613522008-05-21 15:53:59 -05002155 cls_session = starget_to_session(scsi_target(sc->device));
2156 session = cls_session->dd_data;
2157
Erez Zilberbd2199d2009-06-15 22:11:10 -05002158 ISCSI_DBG_EH(session, "aborting sc %p\n", sc);
Mike Christie4421c9e2009-05-13 17:57:50 -05002159
Mike Christie6724add2007-08-15 01:38:30 -05002160 mutex_lock(&session->eh_mutex);
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002161 spin_lock_bh(&session->frwd_lock);
Mike Christief47f2cf2006-08-31 18:09:33 -04002162 /*
2163 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
2164 * got the command.
2165 */
2166 if (!sc->SCp.ptr) {
Erez Zilberbd2199d2009-06-15 22:11:10 -05002167 ISCSI_DBG_EH(session, "sc never reached iscsi layer or "
2168 "it completed.\n");
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002169 spin_unlock_bh(&session->frwd_lock);
Mike Christie6724add2007-08-15 01:38:30 -05002170 mutex_unlock(&session->eh_mutex);
Mike Christief47f2cf2006-08-31 18:09:33 -04002171 return SUCCESS;
2172 }
2173
Mike Christie7996a772006-04-06 21:13:41 -05002174 /*
2175 * If we are not logged in or we have started a new session
2176 * then let the host reset code handle this
2177 */
Mike Christie843c0a82007-12-13 12:43:20 -06002178 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
2179 sc->SCp.phase != session->age) {
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002180 spin_unlock_bh(&session->frwd_lock);
Mike Christie843c0a82007-12-13 12:43:20 -06002181 mutex_unlock(&session->eh_mutex);
Erez Zilberbd2199d2009-06-15 22:11:10 -05002182 ISCSI_DBG_EH(session, "failing abort due to dropped "
Mike Christie4421c9e2009-05-13 17:57:50 -05002183 "session.\n");
Mike Christie843c0a82007-12-13 12:43:20 -06002184 return FAILED;
2185 }
2186
2187 conn = session->leadconn;
2188 conn->eh_abort_cnt++;
2189 age = session->age;
2190
Mike Christie9c19a7d2008-05-21 15:54:09 -05002191 task = (struct iscsi_task *)sc->SCp.ptr;
Erez Zilberbd2199d2009-06-15 22:11:10 -05002192 ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n",
2193 sc, task->itt);
Mike Christie7996a772006-04-06 21:13:41 -05002194
Mike Christie9c19a7d2008-05-21 15:54:09 -05002195 /* task completed before time out */
2196 if (!task->sc) {
Erez Zilberbd2199d2009-06-15 22:11:10 -05002197 ISCSI_DBG_EH(session, "sc completed while abort in progress\n");
Mike Christie77a23c22007-05-30 12:57:18 -05002198 goto success;
Mike Christie7ea8b822006-07-24 15:47:22 -05002199 }
Mike Christie7996a772006-04-06 21:13:41 -05002200
Mike Christie9c19a7d2008-05-21 15:54:09 -05002201 if (task->state == ISCSI_TASK_PENDING) {
Mike Christieb3cd5052009-05-13 17:57:49 -05002202 fail_scsi_task(task, DID_ABORT);
Mike Christie77a23c22007-05-30 12:57:18 -05002203 goto success;
2204 }
Mike Christie7996a772006-04-06 21:13:41 -05002205
Mike Christie843c0a82007-12-13 12:43:20 -06002206 /* only have one tmf outstanding at a time */
2207 if (conn->tmf_state != TMF_INITIAL)
Mike Christie7996a772006-04-06 21:13:41 -05002208 goto failed;
Mike Christie843c0a82007-12-13 12:43:20 -06002209 conn->tmf_state = TMF_QUEUED;
Mike Christie7996a772006-04-06 21:13:41 -05002210
Mike Christie843c0a82007-12-13 12:43:20 -06002211 hdr = &conn->tmhdr;
Mike Christie9c19a7d2008-05-21 15:54:09 -05002212 iscsi_prep_abort_task_pdu(task, hdr);
Mike Christie843c0a82007-12-13 12:43:20 -06002213
Bart Van Asschee9e410e2016-03-30 11:27:08 -07002214 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout))
Mike Christie843c0a82007-12-13 12:43:20 -06002215 goto failed;
Mike Christie843c0a82007-12-13 12:43:20 -06002216
2217 switch (conn->tmf_state) {
2218 case TMF_SUCCESS:
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002219 spin_unlock_bh(&session->frwd_lock);
Mike Christie913e5bf2008-05-21 15:54:18 -05002220 /*
2221 * stop tx side incase the target had sent a abort rsp but
2222 * the initiator was still writing out data.
2223 */
Mike Christie6724add2007-08-15 01:38:30 -05002224 iscsi_suspend_tx(conn);
Mike Christie77a23c22007-05-30 12:57:18 -05002225 /*
Mike Christie913e5bf2008-05-21 15:54:18 -05002226 * we do not stop the recv side because targets have been
2227 * good and have never sent us a successful tmf response
2228 * then sent more data for the cmd.
Mike Christie77a23c22007-05-30 12:57:18 -05002229 */
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002230 spin_lock_bh(&session->frwd_lock);
Mike Christieb3cd5052009-05-13 17:57:49 -05002231 fail_scsi_task(task, DID_ABORT);
Mike Christie843c0a82007-12-13 12:43:20 -06002232 conn->tmf_state = TMF_INITIAL;
Mike Christie5d12c052009-11-11 16:34:32 -06002233 memset(hdr, 0, sizeof(*hdr));
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002234 spin_unlock_bh(&session->frwd_lock);
Mike Christie6724add2007-08-15 01:38:30 -05002235 iscsi_start_tx(conn);
Mike Christie77a23c22007-05-30 12:57:18 -05002236 goto success_unlocked;
Mike Christie843c0a82007-12-13 12:43:20 -06002237 case TMF_TIMEDOUT:
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002238 spin_unlock_bh(&session->frwd_lock);
Mike Christiedf4da5c2010-12-31 02:22:18 -06002239 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
Mike Christie843c0a82007-12-13 12:43:20 -06002240 goto failed_unlocked;
2241 case TMF_NOT_FOUND:
2242 if (!sc->SCp.ptr) {
2243 conn->tmf_state = TMF_INITIAL;
Mike Christie5d12c052009-11-11 16:34:32 -06002244 memset(hdr, 0, sizeof(*hdr));
Mike Christie9c19a7d2008-05-21 15:54:09 -05002245 /* task completed before tmf abort response */
Erez Zilberbd2199d2009-06-15 22:11:10 -05002246 ISCSI_DBG_EH(session, "sc completed while abort in "
2247 "progress\n");
Mike Christie77a23c22007-05-30 12:57:18 -05002248 goto success;
Mike Christie7ea8b822006-07-24 15:47:22 -05002249 }
2250 /* fall through */
2251 default:
Mike Christie843c0a82007-12-13 12:43:20 -06002252 conn->tmf_state = TMF_INITIAL;
2253 goto failed;
Mike Christie7996a772006-04-06 21:13:41 -05002254 }
2255
Mike Christie77a23c22007-05-30 12:57:18 -05002256success:
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002257 spin_unlock_bh(&session->frwd_lock);
Mike Christie77a23c22007-05-30 12:57:18 -05002258success_unlocked:
Erez Zilberbd2199d2009-06-15 22:11:10 -05002259 ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n",
2260 sc, task->itt);
Mike Christie6724add2007-08-15 01:38:30 -05002261 mutex_unlock(&session->eh_mutex);
Mike Christie7996a772006-04-06 21:13:41 -05002262 return SUCCESS;
2263
2264failed:
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002265 spin_unlock_bh(&session->frwd_lock);
Mike Christie77a23c22007-05-30 12:57:18 -05002266failed_unlocked:
Erez Zilberbd2199d2009-06-15 22:11:10 -05002267 ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc,
2268 task ? task->itt : 0);
Mike Christie6724add2007-08-15 01:38:30 -05002269 mutex_unlock(&session->eh_mutex);
Mike Christie7996a772006-04-06 21:13:41 -05002270 return FAILED;
2271}
2272EXPORT_SYMBOL_GPL(iscsi_eh_abort);
2273
Mike Christie843c0a82007-12-13 12:43:20 -06002274static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2275{
2276 memset(hdr, 0, sizeof(*hdr));
2277 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2278 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2279 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
Andy Grover55bdabd2011-06-16 15:57:09 -07002280 int_to_scsilun(sc->device->lun, &hdr->lun);
Mike Christief6d51802007-12-13 12:43:30 -06002281 hdr->rtt = RESERVED_ITT;
Mike Christie843c0a82007-12-13 12:43:20 -06002282}
2283
2284int iscsi_eh_device_reset(struct scsi_cmnd *sc)
2285{
Mike Christie75613522008-05-21 15:53:59 -05002286 struct iscsi_cls_session *cls_session;
2287 struct iscsi_session *session;
Mike Christie843c0a82007-12-13 12:43:20 -06002288 struct iscsi_conn *conn;
2289 struct iscsi_tm *hdr;
2290 int rc = FAILED;
2291
Mike Christie75613522008-05-21 15:53:59 -05002292 cls_session = starget_to_session(scsi_target(sc->device));
2293 session = cls_session->dd_data;
2294
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02002295 ISCSI_DBG_EH(session, "LU Reset [sc %p lun %llu]\n", sc,
2296 sc->device->lun);
Mike Christie843c0a82007-12-13 12:43:20 -06002297
2298 mutex_lock(&session->eh_mutex);
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002299 spin_lock_bh(&session->frwd_lock);
Mike Christie843c0a82007-12-13 12:43:20 -06002300 /*
2301 * Just check if we are not logged in. We cannot check for
2302 * the phase because the reset could come from a ioctl.
2303 */
2304 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2305 goto unlock;
2306 conn = session->leadconn;
2307
2308 /* only have one tmf outstanding at a time */
2309 if (conn->tmf_state != TMF_INITIAL)
2310 goto unlock;
2311 conn->tmf_state = TMF_QUEUED;
2312
2313 hdr = &conn->tmhdr;
2314 iscsi_prep_lun_reset_pdu(sc, hdr);
2315
Mike Christie9c19a7d2008-05-21 15:54:09 -05002316 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
Mike Christief6d51802007-12-13 12:43:30 -06002317 session->lu_reset_timeout)) {
Mike Christie843c0a82007-12-13 12:43:20 -06002318 rc = FAILED;
2319 goto unlock;
2320 }
2321
2322 switch (conn->tmf_state) {
2323 case TMF_SUCCESS:
2324 break;
2325 case TMF_TIMEDOUT:
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002326 spin_unlock_bh(&session->frwd_lock);
Mike Christiedf4da5c2010-12-31 02:22:18 -06002327 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
Mike Christie843c0a82007-12-13 12:43:20 -06002328 goto done;
2329 default:
2330 conn->tmf_state = TMF_INITIAL;
2331 goto unlock;
2332 }
2333
2334 rc = SUCCESS;
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002335 spin_unlock_bh(&session->frwd_lock);
Mike Christie843c0a82007-12-13 12:43:20 -06002336
2337 iscsi_suspend_tx(conn);
Mike Christie913e5bf2008-05-21 15:54:18 -05002338
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002339 spin_lock_bh(&session->frwd_lock);
Mike Christie5d12c052009-11-11 16:34:32 -06002340 memset(hdr, 0, sizeof(*hdr));
Mike Christie3bbaaad2009-05-13 17:57:46 -05002341 fail_scsi_tasks(conn, sc->device->lun, DID_ERROR);
Mike Christie843c0a82007-12-13 12:43:20 -06002342 conn->tmf_state = TMF_INITIAL;
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002343 spin_unlock_bh(&session->frwd_lock);
Mike Christie843c0a82007-12-13 12:43:20 -06002344
2345 iscsi_start_tx(conn);
2346 goto done;
2347
2348unlock:
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002349 spin_unlock_bh(&session->frwd_lock);
Mike Christie843c0a82007-12-13 12:43:20 -06002350done:
Erez Zilberbd2199d2009-06-15 22:11:10 -05002351 ISCSI_DBG_EH(session, "dev reset result = %s\n",
2352 rc == SUCCESS ? "SUCCESS" : "FAILED");
Mike Christie843c0a82007-12-13 12:43:20 -06002353 mutex_unlock(&session->eh_mutex);
2354 return rc;
2355}
2356EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
2357
Mike Christie3fe5ae82009-11-11 16:34:33 -06002358void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
2359{
2360 struct iscsi_session *session = cls_session->dd_data;
2361
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002362 spin_lock_bh(&session->frwd_lock);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002363 if (session->state != ISCSI_STATE_LOGGED_IN) {
2364 session->state = ISCSI_STATE_RECOVERY_FAILED;
2365 if (session->leadconn)
2366 wake_up(&session->leadconn->ehwait);
2367 }
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002368 spin_unlock_bh(&session->frwd_lock);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002369}
2370EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
2371
2372/**
2373 * iscsi_eh_session_reset - drop session and attempt relogin
2374 * @sc: scsi command
2375 *
2376 * This function will wait for a relogin, session termination from
2377 * userspace, or a recovery/replacement timeout.
2378 */
Jayamohan Kallickal309ce152010-02-20 08:02:10 +05302379int iscsi_eh_session_reset(struct scsi_cmnd *sc)
Mike Christie3fe5ae82009-11-11 16:34:33 -06002380{
2381 struct iscsi_cls_session *cls_session;
2382 struct iscsi_session *session;
2383 struct iscsi_conn *conn;
2384
2385 cls_session = starget_to_session(scsi_target(sc->device));
2386 session = cls_session->dd_data;
2387 conn = session->leadconn;
2388
2389 mutex_lock(&session->eh_mutex);
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002390 spin_lock_bh(&session->frwd_lock);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002391 if (session->state == ISCSI_STATE_TERMINATE) {
2392failed:
2393 ISCSI_DBG_EH(session,
2394 "failing session reset: Could not log back into "
2395 "%s, %s [age %d]\n", session->targetname,
2396 conn->persistent_address, session->age);
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002397 spin_unlock_bh(&session->frwd_lock);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002398 mutex_unlock(&session->eh_mutex);
2399 return FAILED;
2400 }
2401
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002402 spin_unlock_bh(&session->frwd_lock);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002403 mutex_unlock(&session->eh_mutex);
2404 /*
2405 * we drop the lock here but the leadconn cannot be destoyed while
2406 * we are in the scsi eh
2407 */
Mike Christiedf4da5c2010-12-31 02:22:18 -06002408 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002409
2410 ISCSI_DBG_EH(session, "wait for relogin\n");
2411 wait_event_interruptible(conn->ehwait,
2412 session->state == ISCSI_STATE_TERMINATE ||
2413 session->state == ISCSI_STATE_LOGGED_IN ||
2414 session->state == ISCSI_STATE_RECOVERY_FAILED);
2415 if (signal_pending(current))
2416 flush_signals(current);
2417
2418 mutex_lock(&session->eh_mutex);
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002419 spin_lock_bh(&session->frwd_lock);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002420 if (session->state == ISCSI_STATE_LOGGED_IN) {
2421 ISCSI_DBG_EH(session,
2422 "session reset succeeded for %s,%s\n",
2423 session->targetname, conn->persistent_address);
2424 } else
2425 goto failed;
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002426 spin_unlock_bh(&session->frwd_lock);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002427 mutex_unlock(&session->eh_mutex);
2428 return SUCCESS;
2429}
Jayamohan Kallickal309ce152010-02-20 08:02:10 +05302430EXPORT_SYMBOL_GPL(iscsi_eh_session_reset);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002431
2432static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2433{
2434 memset(hdr, 0, sizeof(*hdr));
2435 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2436 hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2437 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2438 hdr->rtt = RESERVED_ITT;
2439}
2440
2441/**
2442 * iscsi_eh_target_reset - reset target
2443 * @sc: scsi command
2444 *
Jayamohan Kallickal309ce152010-02-20 08:02:10 +05302445 * This will attempt to send a warm target reset.
Mike Christie3fe5ae82009-11-11 16:34:33 -06002446 */
Bart Van Assche3907adf2016-03-30 11:26:46 -07002447static int iscsi_eh_target_reset(struct scsi_cmnd *sc)
Mike Christie3fe5ae82009-11-11 16:34:33 -06002448{
2449 struct iscsi_cls_session *cls_session;
2450 struct iscsi_session *session;
2451 struct iscsi_conn *conn;
2452 struct iscsi_tm *hdr;
2453 int rc = FAILED;
2454
2455 cls_session = starget_to_session(scsi_target(sc->device));
2456 session = cls_session->dd_data;
2457
2458 ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc,
2459 session->targetname);
2460
2461 mutex_lock(&session->eh_mutex);
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002462 spin_lock_bh(&session->frwd_lock);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002463 /*
2464 * Just check if we are not logged in. We cannot check for
2465 * the phase because the reset could come from a ioctl.
2466 */
2467 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2468 goto unlock;
2469 conn = session->leadconn;
2470
2471 /* only have one tmf outstanding at a time */
2472 if (conn->tmf_state != TMF_INITIAL)
2473 goto unlock;
2474 conn->tmf_state = TMF_QUEUED;
2475
2476 hdr = &conn->tmhdr;
2477 iscsi_prep_tgt_reset_pdu(sc, hdr);
2478
2479 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
2480 session->tgt_reset_timeout)) {
2481 rc = FAILED;
2482 goto unlock;
2483 }
2484
2485 switch (conn->tmf_state) {
2486 case TMF_SUCCESS:
2487 break;
2488 case TMF_TIMEDOUT:
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002489 spin_unlock_bh(&session->frwd_lock);
Mike Christiedf4da5c2010-12-31 02:22:18 -06002490 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002491 goto done;
2492 default:
2493 conn->tmf_state = TMF_INITIAL;
2494 goto unlock;
2495 }
2496
2497 rc = SUCCESS;
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002498 spin_unlock_bh(&session->frwd_lock);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002499
2500 iscsi_suspend_tx(conn);
2501
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002502 spin_lock_bh(&session->frwd_lock);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002503 memset(hdr, 0, sizeof(*hdr));
2504 fail_scsi_tasks(conn, -1, DID_ERROR);
2505 conn->tmf_state = TMF_INITIAL;
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002506 spin_unlock_bh(&session->frwd_lock);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002507
2508 iscsi_start_tx(conn);
2509 goto done;
2510
2511unlock:
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002512 spin_unlock_bh(&session->frwd_lock);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002513done:
2514 ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname,
2515 rc == SUCCESS ? "SUCCESS" : "FAILED");
2516 mutex_unlock(&session->eh_mutex);
Jayamohan Kallickal309ce152010-02-20 08:02:10 +05302517 return rc;
2518}
Mike Christie3fe5ae82009-11-11 16:34:33 -06002519
Jayamohan Kallickal309ce152010-02-20 08:02:10 +05302520/**
2521 * iscsi_eh_recover_target - reset target and possibly the session
2522 * @sc: scsi command
2523 *
2524 * This will attempt to send a warm target reset. If that fails,
2525 * we will escalate to ERL0 session recovery.
2526 */
2527int iscsi_eh_recover_target(struct scsi_cmnd *sc)
2528{
2529 int rc;
2530
2531 rc = iscsi_eh_target_reset(sc);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002532 if (rc == FAILED)
2533 rc = iscsi_eh_session_reset(sc);
2534 return rc;
2535}
Jayamohan Kallickal309ce152010-02-20 08:02:10 +05302536EXPORT_SYMBOL_GPL(iscsi_eh_recover_target);
Mike Christie3fe5ae82009-11-11 16:34:33 -06002537
Olaf Kirch63203772007-12-13 12:43:25 -06002538/*
2539 * Pre-allocate a pool of @max items of @item_size. By default, the pool
2540 * should be accessed via kfifo_{get,put} on q->queue.
2541 * Optionally, the caller can obtain the array of object pointers
2542 * by passing in a non-NULL @items pointer
2543 */
Mike Christie7996a772006-04-06 21:13:41 -05002544int
Olaf Kirch63203772007-12-13 12:43:25 -06002545iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
Mike Christie7996a772006-04-06 21:13:41 -05002546{
Olaf Kirch63203772007-12-13 12:43:25 -06002547 int i, num_arrays = 1;
Mike Christie7996a772006-04-06 21:13:41 -05002548
Olaf Kirch63203772007-12-13 12:43:25 -06002549 memset(q, 0, sizeof(*q));
Mike Christie7996a772006-04-06 21:13:41 -05002550
2551 q->max = max;
Olaf Kirch63203772007-12-13 12:43:25 -06002552
2553 /* If the user passed an items pointer, he wants a copy of
2554 * the array. */
2555 if (items)
2556 num_arrays++;
2557 q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL);
2558 if (q->pool == NULL)
Jean Delvaref474a372009-03-05 14:45:55 -06002559 return -ENOMEM;
Mike Christie7996a772006-04-06 21:13:41 -05002560
Stefani Seiboldc1e13f22009-12-21 14:37:27 -08002561 kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*));
Mike Christie7996a772006-04-06 21:13:41 -05002562
2563 for (i = 0; i < max; i++) {
Olaf Kirch63203772007-12-13 12:43:25 -06002564 q->pool[i] = kzalloc(item_size, GFP_KERNEL);
Mike Christie7996a772006-04-06 21:13:41 -05002565 if (q->pool[i] == NULL) {
Olaf Kirch63203772007-12-13 12:43:25 -06002566 q->max = i;
2567 goto enomem;
Mike Christie7996a772006-04-06 21:13:41 -05002568 }
Stefani Seibold7acd72e2009-12-21 14:37:28 -08002569 kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*));
Mike Christie7996a772006-04-06 21:13:41 -05002570 }
Olaf Kirch63203772007-12-13 12:43:25 -06002571
2572 if (items) {
2573 *items = q->pool + max;
2574 memcpy(*items, q->pool, max * sizeof(void *));
2575 }
2576
Mike Christie7996a772006-04-06 21:13:41 -05002577 return 0;
Olaf Kirch63203772007-12-13 12:43:25 -06002578
2579enomem:
2580 iscsi_pool_free(q);
2581 return -ENOMEM;
Mike Christie7996a772006-04-06 21:13:41 -05002582}
2583EXPORT_SYMBOL_GPL(iscsi_pool_init);
2584
Olaf Kirch63203772007-12-13 12:43:25 -06002585void iscsi_pool_free(struct iscsi_pool *q)
Mike Christie7996a772006-04-06 21:13:41 -05002586{
2587 int i;
2588
2589 for (i = 0; i < q->max; i++)
Olaf Kirch63203772007-12-13 12:43:25 -06002590 kfree(q->pool[i]);
Jean Delvaref474a372009-03-05 14:45:55 -06002591 kfree(q->pool);
Mike Christie7996a772006-04-06 21:13:41 -05002592}
2593EXPORT_SYMBOL_GPL(iscsi_pool_free);
2594
Mike Christiea4804cd2008-05-21 15:54:00 -05002595/**
2596 * iscsi_host_add - add host to system
2597 * @shost: scsi host
2598 * @pdev: parent device
2599 *
2600 * This should be called by partial offload and software iscsi drivers
2601 * to add a host to the system.
2602 */
2603int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev)
Mike Christie7996a772006-04-06 21:13:41 -05002604{
Mike Christie8e9a20c2008-06-16 10:11:33 -05002605 if (!shost->can_queue)
2606 shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX;
2607
Mike Christie4d108352009-03-05 14:46:04 -06002608 if (!shost->cmd_per_lun)
2609 shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN;
2610
Mike Christie308cec12009-02-06 12:06:20 -06002611 if (!shost->transportt->eh_timed_out)
2612 shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out;
Mike Christiea4804cd2008-05-21 15:54:00 -05002613 return scsi_add_host(shost, pdev);
2614}
2615EXPORT_SYMBOL_GPL(iscsi_host_add);
2616
2617/**
2618 * iscsi_host_alloc - allocate a host and driver data
2619 * @sht: scsi host template
2620 * @dd_data_size: driver host data size
Mike Christie32ae7632009-03-05 14:46:03 -06002621 * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue
Mike Christiea4804cd2008-05-21 15:54:00 -05002622 *
2623 * This should be called by partial offload and software iscsi drivers.
2624 * To access the driver specific memory use the iscsi_host_priv() macro.
2625 */
2626struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
Mike Christie4d108352009-03-05 14:46:04 -06002627 int dd_data_size, bool xmit_can_sleep)
Mike Christiea4804cd2008-05-21 15:54:00 -05002628{
2629 struct Scsi_Host *shost;
Mike Christiee5bd7b52008-09-24 11:46:10 -05002630 struct iscsi_host *ihost;
Mike Christiea4804cd2008-05-21 15:54:00 -05002631
2632 shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size);
2633 if (!shost)
2634 return NULL;
Mike Christiee5bd7b52008-09-24 11:46:10 -05002635 ihost = shost_priv(shost);
Mike Christie32ae7632009-03-05 14:46:03 -06002636
2637 if (xmit_can_sleep) {
2638 snprintf(ihost->workq_name, sizeof(ihost->workq_name),
2639 "iscsi_q_%d", shost->host_no);
2640 ihost->workq = create_singlethread_workqueue(ihost->workq_name);
2641 if (!ihost->workq)
2642 goto free_host;
2643 }
2644
Mike Christiee5bd7b52008-09-24 11:46:10 -05002645 spin_lock_init(&ihost->lock);
2646 ihost->state = ISCSI_HOST_SETUP;
2647 ihost->num_sessions = 0;
2648 init_waitqueue_head(&ihost->session_removal_wq);
Mike Christiea4804cd2008-05-21 15:54:00 -05002649 return shost;
Mike Christie32ae7632009-03-05 14:46:03 -06002650
2651free_host:
2652 scsi_host_put(shost);
2653 return NULL;
Mike Christie75613522008-05-21 15:53:59 -05002654}
Mike Christiea4804cd2008-05-21 15:54:00 -05002655EXPORT_SYMBOL_GPL(iscsi_host_alloc);
Mike Christie75613522008-05-21 15:53:59 -05002656
Mike Christiee5bd7b52008-09-24 11:46:10 -05002657static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session)
2658{
Mike Christie40a06e72009-03-05 14:46:05 -06002659 iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST);
Mike Christiee5bd7b52008-09-24 11:46:10 -05002660}
2661
Mike Christiea4804cd2008-05-21 15:54:00 -05002662/**
2663 * iscsi_host_remove - remove host and sessions
2664 * @shost: scsi host
2665 *
Mike Christiee5bd7b52008-09-24 11:46:10 -05002666 * If there are any sessions left, this will initiate the removal and wait
2667 * for the completion.
Mike Christiea4804cd2008-05-21 15:54:00 -05002668 */
2669void iscsi_host_remove(struct Scsi_Host *shost)
2670{
Mike Christiee5bd7b52008-09-24 11:46:10 -05002671 struct iscsi_host *ihost = shost_priv(shost);
2672 unsigned long flags;
2673
2674 spin_lock_irqsave(&ihost->lock, flags);
2675 ihost->state = ISCSI_HOST_REMOVED;
2676 spin_unlock_irqrestore(&ihost->lock, flags);
2677
2678 iscsi_host_for_each_session(shost, iscsi_notify_host_removed);
2679 wait_event_interruptible(ihost->session_removal_wq,
2680 ihost->num_sessions == 0);
2681 if (signal_pending(current))
2682 flush_signals(current);
2683
Mike Christiea4804cd2008-05-21 15:54:00 -05002684 scsi_remove_host(shost);
Mike Christie32ae7632009-03-05 14:46:03 -06002685 if (ihost->workq)
2686 destroy_workqueue(ihost->workq);
Mike Christiea4804cd2008-05-21 15:54:00 -05002687}
2688EXPORT_SYMBOL_GPL(iscsi_host_remove);
2689
2690void iscsi_host_free(struct Scsi_Host *shost)
Mike Christie75613522008-05-21 15:53:59 -05002691{
2692 struct iscsi_host *ihost = shost_priv(shost);
2693
2694 kfree(ihost->netdev);
2695 kfree(ihost->hwaddress);
2696 kfree(ihost->initiatorname);
Mike Christiea4804cd2008-05-21 15:54:00 -05002697 scsi_host_put(shost);
Mike Christie75613522008-05-21 15:53:59 -05002698}
Mike Christiea4804cd2008-05-21 15:54:00 -05002699EXPORT_SYMBOL_GPL(iscsi_host_free);
Mike Christie75613522008-05-21 15:53:59 -05002700
Mike Christiee5bd7b52008-09-24 11:46:10 -05002701static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost)
2702{
2703 struct iscsi_host *ihost = shost_priv(shost);
2704 unsigned long flags;
2705
2706 shost = scsi_host_get(shost);
2707 if (!shost) {
2708 printk(KERN_ERR "Invalid state. Cannot notify host removal "
2709 "of session teardown event because host already "
2710 "removed.\n");
2711 return;
2712 }
2713
2714 spin_lock_irqsave(&ihost->lock, flags);
2715 ihost->num_sessions--;
2716 if (ihost->num_sessions == 0)
2717 wake_up(&ihost->session_removal_wq);
2718 spin_unlock_irqrestore(&ihost->lock, flags);
2719 scsi_host_put(shost);
2720}
2721
Mike Christie75613522008-05-21 15:53:59 -05002722/**
2723 * iscsi_session_setup - create iscsi cls session and host and session
2724 * @iscsit: iscsi transport template
2725 * @shost: scsi host
2726 * @cmds_max: session can queue
Mike Christie9c19a7d2008-05-21 15:54:09 -05002727 * @cmd_task_size: LLD task private data size
Mike Christie75613522008-05-21 15:53:59 -05002728 * @initial_cmdsn: initial CmdSN
2729 *
2730 * This can be used by software iscsi_transports that allocate
2731 * a session per scsi host.
Mike Christie3cf7b232008-05-21 15:54:17 -05002732 *
2733 * Callers should set cmds_max to the largest total numer (mgmt + scsi) of
2734 * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks
2735 * for nop handling and login/logout requests.
Mike Christie75613522008-05-21 15:53:59 -05002736 */
2737struct iscsi_cls_session *
2738iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
Jayamohan Kallickalb8b9e1b82009-09-22 08:21:22 +05302739 uint16_t cmds_max, int dd_size, int cmd_task_size,
Mike Christie79706342008-05-21 15:54:12 -05002740 uint32_t initial_cmdsn, unsigned int id)
Mike Christie75613522008-05-21 15:53:59 -05002741{
Mike Christiee5bd7b52008-09-24 11:46:10 -05002742 struct iscsi_host *ihost = shost_priv(shost);
Mike Christie75613522008-05-21 15:53:59 -05002743 struct iscsi_session *session;
2744 struct iscsi_cls_session *cls_session;
Mike Christie3cf7b232008-05-21 15:54:17 -05002745 int cmd_i, scsi_cmds, total_cmds = cmds_max;
Mike Christiee5bd7b52008-09-24 11:46:10 -05002746 unsigned long flags;
2747
2748 spin_lock_irqsave(&ihost->lock, flags);
2749 if (ihost->state == ISCSI_HOST_REMOVED) {
2750 spin_unlock_irqrestore(&ihost->lock, flags);
2751 return NULL;
2752 }
2753 ihost->num_sessions++;
2754 spin_unlock_irqrestore(&ihost->lock, flags);
Mike Christie8e9a20c2008-06-16 10:11:33 -05002755
2756 if (!total_cmds)
2757 total_cmds = ISCSI_DEF_XMIT_CMDS_MAX;
Mike Christie3e5c28a2008-05-21 15:54:06 -05002758 /*
Mike Christie3cf7b232008-05-21 15:54:17 -05002759 * The iscsi layer needs some tasks for nop handling and tmfs,
2760 * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX
2761 * + 1 command for scsi IO.
Mike Christie3e5c28a2008-05-21 15:54:06 -05002762 */
Mike Christie3cf7b232008-05-21 15:54:17 -05002763 if (total_cmds < ISCSI_TOTAL_CMDS_MIN) {
2764 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2765 "must be a power of two that is at least %d.\n",
2766 total_cmds, ISCSI_TOTAL_CMDS_MIN);
Mike Christiee5bd7b52008-09-24 11:46:10 -05002767 goto dec_session_count;
Mike Christie15482712007-05-30 12:57:19 -05002768 }
Mike Christie3cf7b232008-05-21 15:54:17 -05002769
2770 if (total_cmds > ISCSI_TOTAL_CMDS_MAX) {
2771 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2772 "must be a power of 2 less than or equal to %d.\n",
2773 cmds_max, ISCSI_TOTAL_CMDS_MAX);
2774 total_cmds = ISCSI_TOTAL_CMDS_MAX;
2775 }
2776
2777 if (!is_power_of_2(total_cmds)) {
2778 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2779 "must be a power of 2.\n", total_cmds);
2780 total_cmds = rounddown_pow_of_two(total_cmds);
2781 if (total_cmds < ISCSI_TOTAL_CMDS_MIN)
2782 return NULL;
2783 printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n",
2784 total_cmds);
2785 }
2786 scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX;
Mike Christie15482712007-05-30 12:57:19 -05002787
Mike Christie5d91e202008-05-21 15:54:01 -05002788 cls_session = iscsi_alloc_session(shost, iscsit,
Jayamohan Kallickalb8b9e1b82009-09-22 08:21:22 +05302789 sizeof(struct iscsi_session) +
2790 dd_size);
Mike Christie75613522008-05-21 15:53:59 -05002791 if (!cls_session)
Mike Christiee5bd7b52008-09-24 11:46:10 -05002792 goto dec_session_count;
Mike Christie75613522008-05-21 15:53:59 -05002793 session = cls_session->dd_data;
2794 session->cls_session = cls_session;
Mike Christie7996a772006-04-06 21:13:41 -05002795 session->host = shost;
2796 session->state = ISCSI_STATE_FREE;
Mike Christief6d51802007-12-13 12:43:30 -06002797 session->fast_abort = 1;
Mike Christie3fe5ae82009-11-11 16:34:33 -06002798 session->tgt_reset_timeout = 30;
Mike Christie4cd49ea2007-12-13 12:43:38 -06002799 session->lu_reset_timeout = 15;
2800 session->abort_timeout = 10;
Mike Christie3cf7b232008-05-21 15:54:17 -05002801 session->scsi_cmds_max = scsi_cmds;
2802 session->cmds_max = total_cmds;
Mike Christiee0726402007-07-26 12:46:48 -05002803 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
Mike Christie7996a772006-04-06 21:13:41 -05002804 session->exp_cmdsn = initial_cmdsn + 1;
2805 session->max_cmdsn = initial_cmdsn + 1;
2806 session->max_r2t = 1;
2807 session->tt = iscsit;
Jayamohan Kallickalb8b9e1b82009-09-22 08:21:22 +05302808 session->dd_data = cls_session->dd_data + sizeof(*session);
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002809
Mike Christie6724add2007-08-15 01:38:30 -05002810 mutex_init(&session->eh_mutex);
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002811 spin_lock_init(&session->frwd_lock);
2812 spin_lock_init(&session->back_lock);
Mike Christie7996a772006-04-06 21:13:41 -05002813
2814 /* initialize SCSI PDU commands pool */
2815 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
2816 (void***)&session->cmds,
Mike Christie9c19a7d2008-05-21 15:54:09 -05002817 cmd_task_size + sizeof(struct iscsi_task)))
Mike Christie7996a772006-04-06 21:13:41 -05002818 goto cmdpool_alloc_fail;
2819
2820 /* pre-format cmds pool with ITT */
2821 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
Mike Christie9c19a7d2008-05-21 15:54:09 -05002822 struct iscsi_task *task = session->cmds[cmd_i];
Mike Christie7996a772006-04-06 21:13:41 -05002823
Mike Christie9c19a7d2008-05-21 15:54:09 -05002824 if (cmd_task_size)
2825 task->dd_data = &task[1];
2826 task->itt = cmd_i;
Mike Christie3bbaaad2009-05-13 17:57:46 -05002827 task->state = ISCSI_TASK_FREE;
Mike Christie9c19a7d2008-05-21 15:54:09 -05002828 INIT_LIST_HEAD(&task->running);
Mike Christie7996a772006-04-06 21:13:41 -05002829 }
2830
Mike Christief53a88d2006-06-28 12:00:27 -05002831 if (!try_module_get(iscsit->owner))
Mike Christie75613522008-05-21 15:53:59 -05002832 goto module_get_fail;
2833
Mike Christie79706342008-05-21 15:54:12 -05002834 if (iscsi_add_session(cls_session, id))
Mike Christief53a88d2006-06-28 12:00:27 -05002835 goto cls_session_fail;
Mike Christiee5bd7b52008-09-24 11:46:10 -05002836
Mike Christie7996a772006-04-06 21:13:41 -05002837 return cls_session;
2838
2839cls_session_fail:
Mike Christie75613522008-05-21 15:53:59 -05002840 module_put(iscsit->owner);
2841module_get_fail:
Olaf Kirch63203772007-12-13 12:43:25 -06002842 iscsi_pool_free(&session->cmdpool);
Mike Christie7996a772006-04-06 21:13:41 -05002843cmdpool_alloc_fail:
Mike Christie75613522008-05-21 15:53:59 -05002844 iscsi_free_session(cls_session);
Mike Christiee5bd7b52008-09-24 11:46:10 -05002845dec_session_count:
2846 iscsi_host_dec_session_cnt(shost);
Mike Christie7996a772006-04-06 21:13:41 -05002847 return NULL;
2848}
2849EXPORT_SYMBOL_GPL(iscsi_session_setup);
2850
2851/**
2852 * iscsi_session_teardown - destroy session, host, and cls_session
Mike Christie75613522008-05-21 15:53:59 -05002853 * @cls_session: iscsi session
Mike Christie7996a772006-04-06 21:13:41 -05002854 *
Mike Christie75613522008-05-21 15:53:59 -05002855 * The driver must have called iscsi_remove_session before
2856 * calling this.
2857 */
Mike Christie7996a772006-04-06 21:13:41 -05002858void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
2859{
Mike Christie75613522008-05-21 15:53:59 -05002860 struct iscsi_session *session = cls_session->dd_data;
Mike Christie63f75cc2006-07-24 15:47:29 -05002861 struct module *owner = cls_session->transport->owner;
Mike Christiee5bd7b52008-09-24 11:46:10 -05002862 struct Scsi_Host *shost = session->host;
Mike Christie7996a772006-04-06 21:13:41 -05002863
Olaf Kirch63203772007-12-13 12:43:25 -06002864 iscsi_pool_free(&session->cmdpool);
Mike Christie7996a772006-04-06 21:13:41 -05002865
Mike Christieb2c64162007-05-30 12:57:16 -05002866 kfree(session->password);
2867 kfree(session->password_in);
2868 kfree(session->username);
2869 kfree(session->username_in);
Mike Christief3ff0c32006-07-24 15:47:50 -05002870 kfree(session->targetname);
Vikas Chaudhary3c5c4802012-01-19 03:06:53 -08002871 kfree(session->targetalias);
Mike Christie88dfd342008-05-21 15:54:16 -05002872 kfree(session->initiatorname);
Eddie Wai3b9373e2013-06-20 10:21:26 -07002873 kfree(session->boot_root);
2874 kfree(session->boot_nic);
2875 kfree(session->boot_target);
Mike Christie88dfd342008-05-21 15:54:16 -05002876 kfree(session->ifacename);
Adheer Chandravanshif8525eb2013-07-01 05:54:12 -04002877 kfree(session->portal_type);
2878 kfree(session->discovery_parent_type);
Mike Christief3ff0c32006-07-24 15:47:50 -05002879
Mike Christie75613522008-05-21 15:53:59 -05002880 iscsi_destroy_session(cls_session);
Mike Christiee5bd7b52008-09-24 11:46:10 -05002881 iscsi_host_dec_session_cnt(shost);
Mike Christie63f75cc2006-07-24 15:47:29 -05002882 module_put(owner);
Mike Christie7996a772006-04-06 21:13:41 -05002883}
2884EXPORT_SYMBOL_GPL(iscsi_session_teardown);
2885
2886/**
2887 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
2888 * @cls_session: iscsi_cls_session
Mike Christie5d91e202008-05-21 15:54:01 -05002889 * @dd_size: private driver data size
Mike Christie7996a772006-04-06 21:13:41 -05002890 * @conn_idx: cid
Mike Christie5d91e202008-05-21 15:54:01 -05002891 */
Mike Christie7996a772006-04-06 21:13:41 -05002892struct iscsi_cls_conn *
Mike Christie5d91e202008-05-21 15:54:01 -05002893iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size,
2894 uint32_t conn_idx)
Mike Christie7996a772006-04-06 21:13:41 -05002895{
Mike Christie75613522008-05-21 15:53:59 -05002896 struct iscsi_session *session = cls_session->dd_data;
Mike Christie7996a772006-04-06 21:13:41 -05002897 struct iscsi_conn *conn;
2898 struct iscsi_cls_conn *cls_conn;
Mike Christied36ab6f2006-05-18 20:31:34 -05002899 char *data;
Mike Christie7996a772006-04-06 21:13:41 -05002900
Mike Christie5d91e202008-05-21 15:54:01 -05002901 cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size,
2902 conn_idx);
Mike Christie7996a772006-04-06 21:13:41 -05002903 if (!cls_conn)
2904 return NULL;
2905 conn = cls_conn->dd_data;
Mike Christie5d91e202008-05-21 15:54:01 -05002906 memset(conn, 0, sizeof(*conn) + dd_size);
Mike Christie7996a772006-04-06 21:13:41 -05002907
Mike Christie5d91e202008-05-21 15:54:01 -05002908 conn->dd_data = cls_conn->dd_data + sizeof(*conn);
Mike Christie7996a772006-04-06 21:13:41 -05002909 conn->session = session;
2910 conn->cls_conn = cls_conn;
2911 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
2912 conn->id = conn_idx;
2913 conn->exp_statsn = 0;
Mike Christie843c0a82007-12-13 12:43:20 -06002914 conn->tmf_state = TMF_INITIAL;
Mike Christief6d51802007-12-13 12:43:30 -06002915
2916 init_timer(&conn->transport_timer);
2917 conn->transport_timer.data = (unsigned long)conn;
2918 conn->transport_timer.function = iscsi_check_transport_timeouts;
2919
Mike Christie843c0a82007-12-13 12:43:20 -06002920 INIT_LIST_HEAD(&conn->mgmtqueue);
Mike Christie3bbaaad2009-05-13 17:57:46 -05002921 INIT_LIST_HEAD(&conn->cmdqueue);
Mike Christie843c0a82007-12-13 12:43:20 -06002922 INIT_LIST_HEAD(&conn->requeue);
Chris Leechde1ff842017-02-27 16:58:36 -08002923 spin_lock_init(&conn->taskqueuelock);
David Howellsc4028952006-11-22 14:57:56 +00002924 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
Mike Christie7996a772006-04-06 21:13:41 -05002925
Mike Christie9c19a7d2008-05-21 15:54:09 -05002926 /* allocate login_task used for the login/text sequences */
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002927 spin_lock_bh(&session->frwd_lock);
Stefani Seibold7acd72e2009-12-21 14:37:28 -08002928 if (!kfifo_out(&session->cmdpool.queue,
Mike Christie9c19a7d2008-05-21 15:54:09 -05002929 (void*)&conn->login_task,
Mike Christie7996a772006-04-06 21:13:41 -05002930 sizeof(void*))) {
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002931 spin_unlock_bh(&session->frwd_lock);
Mike Christie9c19a7d2008-05-21 15:54:09 -05002932 goto login_task_alloc_fail;
Mike Christie7996a772006-04-06 21:13:41 -05002933 }
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002934 spin_unlock_bh(&session->frwd_lock);
Mike Christie7996a772006-04-06 21:13:41 -05002935
Mike Christiecfeb2cf2008-12-02 00:32:09 -06002936 data = (char *) __get_free_pages(GFP_KERNEL,
2937 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
Mike Christied36ab6f2006-05-18 20:31:34 -05002938 if (!data)
Mike Christie9c19a7d2008-05-21 15:54:09 -05002939 goto login_task_data_alloc_fail;
2940 conn->login_task->data = conn->data = data;
Mike Christied36ab6f2006-05-18 20:31:34 -05002941
Mike Christie843c0a82007-12-13 12:43:20 -06002942 init_timer(&conn->tmf_timer);
Mike Christie7996a772006-04-06 21:13:41 -05002943 init_waitqueue_head(&conn->ehwait);
2944
2945 return cls_conn;
2946
Mike Christie9c19a7d2008-05-21 15:54:09 -05002947login_task_data_alloc_fail:
Stefani Seibold7acd72e2009-12-21 14:37:28 -08002948 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
Mike Christied36ab6f2006-05-18 20:31:34 -05002949 sizeof(void*));
Mike Christie9c19a7d2008-05-21 15:54:09 -05002950login_task_alloc_fail:
Mike Christie7996a772006-04-06 21:13:41 -05002951 iscsi_destroy_conn(cls_conn);
2952 return NULL;
2953}
2954EXPORT_SYMBOL_GPL(iscsi_conn_setup);
2955
2956/**
2957 * iscsi_conn_teardown - teardown iscsi connection
2958 * cls_conn: iscsi class connection
2959 *
2960 * TODO: we may need to make this into a two step process
2961 * like scsi-mls remove + put host
2962 */
2963void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
2964{
2965 struct iscsi_conn *conn = cls_conn->dd_data;
2966 struct iscsi_session *session = conn->session;
Mike Christie7996a772006-04-06 21:13:41 -05002967
Mike Christief6d51802007-12-13 12:43:30 -06002968 del_timer_sync(&conn->transport_timer);
2969
John Soni Jose660d0832015-06-24 06:41:58 +05302970 mutex_lock(&session->eh_mutex);
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002971 spin_lock_bh(&session->frwd_lock);
Mike Christie7996a772006-04-06 21:13:41 -05002972 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
2973 if (session->leadconn == conn) {
2974 /*
2975 * leading connection? then give up on recovery.
2976 */
2977 session->state = ISCSI_STATE_TERMINATE;
2978 wake_up(&conn->ehwait);
2979 }
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002980 spin_unlock_bh(&session->frwd_lock);
Mike Christie7996a772006-04-06 21:13:41 -05002981
Mike Christie779ea122007-02-28 17:32:15 -06002982 /* flush queued up work because we free the connection below */
Mike Christie843c0a82007-12-13 12:43:20 -06002983 iscsi_suspend_tx(conn);
Mike Christie779ea122007-02-28 17:32:15 -06002984
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002985 spin_lock_bh(&session->frwd_lock);
Mike Christiecfeb2cf2008-12-02 00:32:09 -06002986 free_pages((unsigned long) conn->data,
2987 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
Mike Christief3ff0c32006-07-24 15:47:50 -05002988 kfree(conn->persistent_address);
Adheer Chandravanshiae56ff42013-11-22 05:28:21 -05002989 kfree(conn->local_ipaddr);
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002990 /* regular RX path uses back_lock */
2991 spin_lock_bh(&session->back_lock);
Stefani Seibold7acd72e2009-12-21 14:37:28 -08002992 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
Mike Christie7996a772006-04-06 21:13:41 -05002993 sizeof(void*));
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002994 spin_unlock_bh(&session->back_lock);
Mike Christiee0726402007-07-26 12:46:48 -05002995 if (session->leadconn == conn)
Mike Christie7996a772006-04-06 21:13:41 -05002996 session->leadconn = NULL;
Shlomo Pongratz659743b2014-02-07 00:41:38 -06002997 spin_unlock_bh(&session->frwd_lock);
John Soni Jose660d0832015-06-24 06:41:58 +05302998 mutex_unlock(&session->eh_mutex);
Mike Christie7996a772006-04-06 21:13:41 -05002999
Mike Christie7996a772006-04-06 21:13:41 -05003000 iscsi_destroy_conn(cls_conn);
3001}
3002EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
3003
3004int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
3005{
3006 struct iscsi_conn *conn = cls_conn->dd_data;
3007 struct iscsi_session *session = conn->session;
3008
Mike Christieffd04362006-08-31 18:09:24 -04003009 if (!session) {
Mike Christie322d7392008-01-31 13:36:52 -06003010 iscsi_conn_printk(KERN_ERR, conn,
3011 "can't start unbound connection\n");
Mike Christie7996a772006-04-06 21:13:41 -05003012 return -EPERM;
3013 }
3014
Mike Christiedb98ccd2006-08-31 18:09:31 -04003015 if ((session->imm_data_en || !session->initial_r2t_en) &&
3016 session->first_burst > session->max_burst) {
Mike Christie322d7392008-01-31 13:36:52 -06003017 iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: "
3018 "first_burst %d max_burst %d\n",
3019 session->first_burst, session->max_burst);
Mike Christieffd04362006-08-31 18:09:24 -04003020 return -EINVAL;
3021 }
3022
Mike Christief6d51802007-12-13 12:43:30 -06003023 if (conn->ping_timeout && !conn->recv_timeout) {
Mike Christie322d7392008-01-31 13:36:52 -06003024 iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of "
3025 "zero. Using 5 seconds\n.");
Mike Christief6d51802007-12-13 12:43:30 -06003026 conn->recv_timeout = 5;
3027 }
3028
3029 if (conn->recv_timeout && !conn->ping_timeout) {
Mike Christie322d7392008-01-31 13:36:52 -06003030 iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of "
3031 "zero. Using 5 seconds.\n");
Mike Christief6d51802007-12-13 12:43:30 -06003032 conn->ping_timeout = 5;
3033 }
3034
Shlomo Pongratz659743b2014-02-07 00:41:38 -06003035 spin_lock_bh(&session->frwd_lock);
Mike Christie7996a772006-04-06 21:13:41 -05003036 conn->c_stage = ISCSI_CONN_STARTED;
3037 session->state = ISCSI_STATE_LOGGED_IN;
Mike Christiee0726402007-07-26 12:46:48 -05003038 session->queued_cmdsn = session->cmdsn;
Mike Christie7996a772006-04-06 21:13:41 -05003039
Mike Christief6d51802007-12-13 12:43:30 -06003040 conn->last_recv = jiffies;
3041 conn->last_ping = jiffies;
3042 if (conn->recv_timeout && conn->ping_timeout)
3043 mod_timer(&conn->transport_timer,
3044 jiffies + (conn->recv_timeout * HZ));
3045
Mike Christie7996a772006-04-06 21:13:41 -05003046 switch(conn->stop_stage) {
3047 case STOP_CONN_RECOVER:
3048 /*
3049 * unblock eh_abort() if it is blocked. re-try all
3050 * commands after successful recovery
3051 */
Mike Christie7996a772006-04-06 21:13:41 -05003052 conn->stop_stage = 0;
Mike Christie843c0a82007-12-13 12:43:20 -06003053 conn->tmf_state = TMF_INITIAL;
Mike Christie7996a772006-04-06 21:13:41 -05003054 session->age++;
Mike Christie8b1d0342008-01-31 13:36:53 -06003055 if (session->age == 16)
3056 session->age = 0;
Mike Christie6eabafb2008-01-31 13:36:43 -06003057 break;
Mike Christie7996a772006-04-06 21:13:41 -05003058 case STOP_CONN_TERM:
Mike Christie7996a772006-04-06 21:13:41 -05003059 conn->stop_stage = 0;
3060 break;
Mike Christie7996a772006-04-06 21:13:41 -05003061 default:
3062 break;
3063 }
Shlomo Pongratz659743b2014-02-07 00:41:38 -06003064 spin_unlock_bh(&session->frwd_lock);
Mike Christie7996a772006-04-06 21:13:41 -05003065
Mike Christie75613522008-05-21 15:53:59 -05003066 iscsi_unblock_session(session->cls_session);
Mike Christie6eabafb2008-01-31 13:36:43 -06003067 wake_up(&conn->ehwait);
Mike Christie7996a772006-04-06 21:13:41 -05003068 return 0;
3069}
3070EXPORT_SYMBOL_GPL(iscsi_conn_start);
3071
3072static void
Mike Christie3bbaaad2009-05-13 17:57:46 -05003073fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn)
Mike Christie7996a772006-04-06 21:13:41 -05003074{
Mike Christie3bbaaad2009-05-13 17:57:46 -05003075 struct iscsi_task *task;
Mike Christieb3cd5052009-05-13 17:57:49 -05003076 int i, state;
Mike Christie7996a772006-04-06 21:13:41 -05003077
Mike Christie3bbaaad2009-05-13 17:57:46 -05003078 for (i = 0; i < conn->session->cmds_max; i++) {
3079 task = conn->session->cmds[i];
3080 if (task->sc)
3081 continue;
3082
3083 if (task->state == ISCSI_TASK_FREE)
3084 continue;
3085
3086 ISCSI_DBG_SESSION(conn->session,
3087 "failing mgmt itt 0x%x state %d\n",
3088 task->itt, task->state);
Mike Christieb3cd5052009-05-13 17:57:49 -05003089 state = ISCSI_TASK_ABRT_SESS_RECOV;
3090 if (task->state == ISCSI_TASK_PENDING)
3091 state = ISCSI_TASK_COMPLETED;
3092 iscsi_complete_task(task, state);
3093
Mike Christie7996a772006-04-06 21:13:41 -05003094 }
Mike Christie7996a772006-04-06 21:13:41 -05003095}
3096
Mike Christie656cffc2006-05-18 20:31:42 -05003097static void iscsi_start_session_recovery(struct iscsi_session *session,
3098 struct iscsi_conn *conn, int flag)
Mike Christie7996a772006-04-06 21:13:41 -05003099{
Mike Christieed2abc72006-05-02 19:46:40 -05003100 int old_stop_stage;
3101
Mike Christie6724add2007-08-15 01:38:30 -05003102 mutex_lock(&session->eh_mutex);
Shlomo Pongratz659743b2014-02-07 00:41:38 -06003103 spin_lock_bh(&session->frwd_lock);
Mike Christieed2abc72006-05-02 19:46:40 -05003104 if (conn->stop_stage == STOP_CONN_TERM) {
Shlomo Pongratz659743b2014-02-07 00:41:38 -06003105 spin_unlock_bh(&session->frwd_lock);
Mike Christie6724add2007-08-15 01:38:30 -05003106 mutex_unlock(&session->eh_mutex);
3107 return;
3108 }
3109
3110 /*
Mike Christieed2abc72006-05-02 19:46:40 -05003111 * When this is called for the in_login state, we only want to clean
Mike Christie9c19a7d2008-05-21 15:54:09 -05003112 * up the login task and connection. We do not need to block and set
Mike Christie67a61112006-05-30 00:37:20 -05003113 * the recovery state again
Mike Christieed2abc72006-05-02 19:46:40 -05003114 */
Mike Christie67a61112006-05-30 00:37:20 -05003115 if (flag == STOP_CONN_TERM)
3116 session->state = ISCSI_STATE_TERMINATE;
3117 else if (conn->stop_stage != STOP_CONN_RECOVER)
3118 session->state = ISCSI_STATE_IN_RECOVERY;
Mike Christie4ae0a6c2010-03-09 14:14:51 -06003119
3120 old_stop_stage = conn->stop_stage;
3121 conn->stop_stage = flag;
Shlomo Pongratz659743b2014-02-07 00:41:38 -06003122 spin_unlock_bh(&session->frwd_lock);
Mike Christieed2abc72006-05-02 19:46:40 -05003123
Mike Christie26013ad2009-05-13 17:57:43 -05003124 del_timer_sync(&conn->transport_timer);
3125 iscsi_suspend_tx(conn);
3126
Shlomo Pongratz659743b2014-02-07 00:41:38 -06003127 spin_lock_bh(&session->frwd_lock);
Mike Christie67a61112006-05-30 00:37:20 -05003128 conn->c_stage = ISCSI_CONN_STOPPED;
Shlomo Pongratz659743b2014-02-07 00:41:38 -06003129 spin_unlock_bh(&session->frwd_lock);
Mike Christie6724add2007-08-15 01:38:30 -05003130
Mike Christie7996a772006-04-06 21:13:41 -05003131 /*
3132 * for connection level recovery we should not calculate
3133 * header digest. conn->hdr_size used for optimization
3134 * in hdr_extract() and will be re-negotiated at
3135 * set_param() time.
3136 */
3137 if (flag == STOP_CONN_RECOVER) {
3138 conn->hdrdgst_en = 0;
3139 conn->datadgst_en = 0;
Mike Christie656cffc2006-05-18 20:31:42 -05003140 if (session->state == ISCSI_STATE_IN_RECOVERY &&
Mike Christie67a61112006-05-30 00:37:20 -05003141 old_stop_stage != STOP_CONN_RECOVER) {
Mike Christie1b2c7af2009-03-05 14:45:58 -06003142 ISCSI_DBG_SESSION(session, "blocking session\n");
Mike Christie75613522008-05-21 15:53:59 -05003143 iscsi_block_session(session->cls_session);
Mike Christie67a61112006-05-30 00:37:20 -05003144 }
Mike Christie7996a772006-04-06 21:13:41 -05003145 }
Mike Christie656cffc2006-05-18 20:31:42 -05003146
Mike Christie656cffc2006-05-18 20:31:42 -05003147 /*
3148 * flush queues.
3149 */
Shlomo Pongratz659743b2014-02-07 00:41:38 -06003150 spin_lock_bh(&session->frwd_lock);
Mike Christieb3cd5052009-05-13 17:57:49 -05003151 fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED);
Mike Christie3bbaaad2009-05-13 17:57:46 -05003152 fail_mgmt_tasks(session, conn);
Mike Christie5d12c052009-11-11 16:34:32 -06003153 memset(&conn->tmhdr, 0, sizeof(conn->tmhdr));
Shlomo Pongratz659743b2014-02-07 00:41:38 -06003154 spin_unlock_bh(&session->frwd_lock);
Mike Christie6724add2007-08-15 01:38:30 -05003155 mutex_unlock(&session->eh_mutex);
Mike Christie7996a772006-04-06 21:13:41 -05003156}
Mike Christie7996a772006-04-06 21:13:41 -05003157
3158void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
3159{
3160 struct iscsi_conn *conn = cls_conn->dd_data;
3161 struct iscsi_session *session = conn->session;
3162
3163 switch (flag) {
3164 case STOP_CONN_RECOVER:
3165 case STOP_CONN_TERM:
3166 iscsi_start_session_recovery(session, conn, flag);
Mike Christie8d2860b2006-05-02 19:46:47 -05003167 break;
Mike Christie7996a772006-04-06 21:13:41 -05003168 default:
Mike Christie322d7392008-01-31 13:36:52 -06003169 iscsi_conn_printk(KERN_ERR, conn,
3170 "invalid stop flag %d\n", flag);
Mike Christie7996a772006-04-06 21:13:41 -05003171 }
3172}
3173EXPORT_SYMBOL_GPL(iscsi_conn_stop);
3174
3175int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
3176 struct iscsi_cls_conn *cls_conn, int is_leading)
3177{
Mike Christie75613522008-05-21 15:53:59 -05003178 struct iscsi_session *session = cls_session->dd_data;
Mike Christie98644042006-10-16 18:09:39 -04003179 struct iscsi_conn *conn = cls_conn->dd_data;
Mike Christie7996a772006-04-06 21:13:41 -05003180
Shlomo Pongratz659743b2014-02-07 00:41:38 -06003181 spin_lock_bh(&session->frwd_lock);
Mike Christie7996a772006-04-06 21:13:41 -05003182 if (is_leading)
3183 session->leadconn = conn;
Shlomo Pongratz659743b2014-02-07 00:41:38 -06003184 spin_unlock_bh(&session->frwd_lock);
Mike Christie7996a772006-04-06 21:13:41 -05003185
3186 /*
3187 * Unblock xmitworker(), Login Phase will pass through.
3188 */
3189 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
3190 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
3191 return 0;
3192}
3193EXPORT_SYMBOL_GPL(iscsi_conn_bind);
3194
Adheer Chandravanshiadaf6992013-03-22 07:41:30 -04003195int iscsi_switch_str_param(char **param, char *new_val_buf)
Mike Christie5700b1a2009-05-13 17:57:40 -05003196{
3197 char *new_val;
3198
3199 if (*param) {
3200 if (!strcmp(*param, new_val_buf))
3201 return 0;
3202 }
3203
3204 new_val = kstrdup(new_val_buf, GFP_NOIO);
3205 if (!new_val)
3206 return -ENOMEM;
3207
3208 kfree(*param);
3209 *param = new_val;
3210 return 0;
3211}
Adheer Chandravanshiadaf6992013-03-22 07:41:30 -04003212EXPORT_SYMBOL_GPL(iscsi_switch_str_param);
Mike Christiea54a52c2006-06-28 12:00:23 -05003213
3214int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
3215 enum iscsi_param param, char *buf, int buflen)
3216{
3217 struct iscsi_conn *conn = cls_conn->dd_data;
3218 struct iscsi_session *session = conn->session;
Or Gerlitz6a06a4b2013-08-08 13:44:29 +03003219 int val;
Mike Christiea54a52c2006-06-28 12:00:23 -05003220
3221 switch(param) {
Mike Christie843c0a82007-12-13 12:43:20 -06003222 case ISCSI_PARAM_FAST_ABORT:
3223 sscanf(buf, "%d", &session->fast_abort);
3224 break;
Mike Christief6d51802007-12-13 12:43:30 -06003225 case ISCSI_PARAM_ABORT_TMO:
3226 sscanf(buf, "%d", &session->abort_timeout);
3227 break;
3228 case ISCSI_PARAM_LU_RESET_TMO:
3229 sscanf(buf, "%d", &session->lu_reset_timeout);
3230 break;
Mike Christie3fe5ae82009-11-11 16:34:33 -06003231 case ISCSI_PARAM_TGT_RESET_TMO:
3232 sscanf(buf, "%d", &session->tgt_reset_timeout);
3233 break;
Mike Christief6d51802007-12-13 12:43:30 -06003234 case ISCSI_PARAM_PING_TMO:
3235 sscanf(buf, "%d", &conn->ping_timeout);
3236 break;
3237 case ISCSI_PARAM_RECV_TMO:
3238 sscanf(buf, "%d", &conn->recv_timeout);
3239 break;
Mike Christiea54a52c2006-06-28 12:00:23 -05003240 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3241 sscanf(buf, "%d", &conn->max_recv_dlength);
3242 break;
3243 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3244 sscanf(buf, "%d", &conn->max_xmit_dlength);
3245 break;
3246 case ISCSI_PARAM_HDRDGST_EN:
3247 sscanf(buf, "%d", &conn->hdrdgst_en);
3248 break;
3249 case ISCSI_PARAM_DATADGST_EN:
3250 sscanf(buf, "%d", &conn->datadgst_en);
3251 break;
3252 case ISCSI_PARAM_INITIAL_R2T_EN:
3253 sscanf(buf, "%d", &session->initial_r2t_en);
3254 break;
3255 case ISCSI_PARAM_MAX_R2T:
Mike Christie1304be52012-01-26 21:13:10 -06003256 sscanf(buf, "%hu", &session->max_r2t);
Mike Christiea54a52c2006-06-28 12:00:23 -05003257 break;
3258 case ISCSI_PARAM_IMM_DATA_EN:
3259 sscanf(buf, "%d", &session->imm_data_en);
3260 break;
3261 case ISCSI_PARAM_FIRST_BURST:
3262 sscanf(buf, "%d", &session->first_burst);
3263 break;
3264 case ISCSI_PARAM_MAX_BURST:
3265 sscanf(buf, "%d", &session->max_burst);
3266 break;
3267 case ISCSI_PARAM_PDU_INORDER_EN:
3268 sscanf(buf, "%d", &session->pdu_inorder_en);
3269 break;
3270 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3271 sscanf(buf, "%d", &session->dataseq_inorder_en);
3272 break;
3273 case ISCSI_PARAM_ERL:
3274 sscanf(buf, "%d", &session->erl);
3275 break;
Mike Christiea54a52c2006-06-28 12:00:23 -05003276 case ISCSI_PARAM_EXP_STATSN:
3277 sscanf(buf, "%u", &conn->exp_statsn);
3278 break;
Mike Christieb2c64162007-05-30 12:57:16 -05003279 case ISCSI_PARAM_USERNAME:
Mike Christie5700b1a2009-05-13 17:57:40 -05003280 return iscsi_switch_str_param(&session->username, buf);
Mike Christieb2c64162007-05-30 12:57:16 -05003281 case ISCSI_PARAM_USERNAME_IN:
Mike Christie5700b1a2009-05-13 17:57:40 -05003282 return iscsi_switch_str_param(&session->username_in, buf);
Mike Christieb2c64162007-05-30 12:57:16 -05003283 case ISCSI_PARAM_PASSWORD:
Mike Christie5700b1a2009-05-13 17:57:40 -05003284 return iscsi_switch_str_param(&session->password, buf);
Mike Christieb2c64162007-05-30 12:57:16 -05003285 case ISCSI_PARAM_PASSWORD_IN:
Mike Christie5700b1a2009-05-13 17:57:40 -05003286 return iscsi_switch_str_param(&session->password_in, buf);
Mike Christiea54a52c2006-06-28 12:00:23 -05003287 case ISCSI_PARAM_TARGET_NAME:
Mike Christie5700b1a2009-05-13 17:57:40 -05003288 return iscsi_switch_str_param(&session->targetname, buf);
Vikas Chaudhary3c5c4802012-01-19 03:06:53 -08003289 case ISCSI_PARAM_TARGET_ALIAS:
3290 return iscsi_switch_str_param(&session->targetalias, buf);
Mike Christiea54a52c2006-06-28 12:00:23 -05003291 case ISCSI_PARAM_TPGT:
3292 sscanf(buf, "%d", &session->tpgt);
3293 break;
3294 case ISCSI_PARAM_PERSISTENT_PORT:
3295 sscanf(buf, "%d", &conn->persistent_port);
3296 break;
3297 case ISCSI_PARAM_PERSISTENT_ADDRESS:
Mike Christie5700b1a2009-05-13 17:57:40 -05003298 return iscsi_switch_str_param(&conn->persistent_address, buf);
Mike Christie88dfd342008-05-21 15:54:16 -05003299 case ISCSI_PARAM_IFACE_NAME:
Mike Christie5700b1a2009-05-13 17:57:40 -05003300 return iscsi_switch_str_param(&session->ifacename, buf);
Mike Christie88dfd342008-05-21 15:54:16 -05003301 case ISCSI_PARAM_INITIATOR_NAME:
Mike Christie5700b1a2009-05-13 17:57:40 -05003302 return iscsi_switch_str_param(&session->initiatorname, buf);
Eddie Wai3b9373e2013-06-20 10:21:26 -07003303 case ISCSI_PARAM_BOOT_ROOT:
3304 return iscsi_switch_str_param(&session->boot_root, buf);
3305 case ISCSI_PARAM_BOOT_NIC:
3306 return iscsi_switch_str_param(&session->boot_nic, buf);
3307 case ISCSI_PARAM_BOOT_TARGET:
3308 return iscsi_switch_str_param(&session->boot_target, buf);
Adheer Chandravanshif8525eb2013-07-01 05:54:12 -04003309 case ISCSI_PARAM_PORTAL_TYPE:
3310 return iscsi_switch_str_param(&session->portal_type, buf);
3311 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE:
3312 return iscsi_switch_str_param(&session->discovery_parent_type,
3313 buf);
Or Gerlitz6a06a4b2013-08-08 13:44:29 +03003314 case ISCSI_PARAM_DISCOVERY_SESS:
3315 sscanf(buf, "%d", &val);
3316 session->discovery_sess = !!val;
3317 break;
Adheer Chandravanshiae56ff42013-11-22 05:28:21 -05003318 case ISCSI_PARAM_LOCAL_IPADDR:
3319 return iscsi_switch_str_param(&conn->local_ipaddr, buf);
Mike Christiea54a52c2006-06-28 12:00:23 -05003320 default:
3321 return -ENOSYS;
3322 }
3323
3324 return 0;
3325}
3326EXPORT_SYMBOL_GPL(iscsi_set_param);
3327
3328int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
3329 enum iscsi_param param, char *buf)
3330{
Mike Christie75613522008-05-21 15:53:59 -05003331 struct iscsi_session *session = cls_session->dd_data;
Mike Christiea54a52c2006-06-28 12:00:23 -05003332 int len;
3333
3334 switch(param) {
Mike Christie843c0a82007-12-13 12:43:20 -06003335 case ISCSI_PARAM_FAST_ABORT:
3336 len = sprintf(buf, "%d\n", session->fast_abort);
3337 break;
Mike Christief6d51802007-12-13 12:43:30 -06003338 case ISCSI_PARAM_ABORT_TMO:
3339 len = sprintf(buf, "%d\n", session->abort_timeout);
3340 break;
3341 case ISCSI_PARAM_LU_RESET_TMO:
3342 len = sprintf(buf, "%d\n", session->lu_reset_timeout);
3343 break;
Mike Christie3fe5ae82009-11-11 16:34:33 -06003344 case ISCSI_PARAM_TGT_RESET_TMO:
3345 len = sprintf(buf, "%d\n", session->tgt_reset_timeout);
3346 break;
Mike Christiea54a52c2006-06-28 12:00:23 -05003347 case ISCSI_PARAM_INITIAL_R2T_EN:
3348 len = sprintf(buf, "%d\n", session->initial_r2t_en);
3349 break;
3350 case ISCSI_PARAM_MAX_R2T:
3351 len = sprintf(buf, "%hu\n", session->max_r2t);
3352 break;
3353 case ISCSI_PARAM_IMM_DATA_EN:
3354 len = sprintf(buf, "%d\n", session->imm_data_en);
3355 break;
3356 case ISCSI_PARAM_FIRST_BURST:
3357 len = sprintf(buf, "%u\n", session->first_burst);
3358 break;
3359 case ISCSI_PARAM_MAX_BURST:
3360 len = sprintf(buf, "%u\n", session->max_burst);
3361 break;
3362 case ISCSI_PARAM_PDU_INORDER_EN:
3363 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
3364 break;
3365 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3366 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
3367 break;
Adheer Chandravanshi5f09e1f2013-07-22 07:46:10 -04003368 case ISCSI_PARAM_DEF_TASKMGMT_TMO:
3369 len = sprintf(buf, "%d\n", session->def_taskmgmt_tmo);
3370 break;
Mike Christiea54a52c2006-06-28 12:00:23 -05003371 case ISCSI_PARAM_ERL:
3372 len = sprintf(buf, "%d\n", session->erl);
3373 break;
3374 case ISCSI_PARAM_TARGET_NAME:
3375 len = sprintf(buf, "%s\n", session->targetname);
3376 break;
Vikas Chaudhary3c5c4802012-01-19 03:06:53 -08003377 case ISCSI_PARAM_TARGET_ALIAS:
3378 len = sprintf(buf, "%s\n", session->targetalias);
3379 break;
Mike Christiea54a52c2006-06-28 12:00:23 -05003380 case ISCSI_PARAM_TPGT:
3381 len = sprintf(buf, "%d\n", session->tpgt);
3382 break;
Mike Christieb2c64162007-05-30 12:57:16 -05003383 case ISCSI_PARAM_USERNAME:
3384 len = sprintf(buf, "%s\n", session->username);
3385 break;
3386 case ISCSI_PARAM_USERNAME_IN:
3387 len = sprintf(buf, "%s\n", session->username_in);
3388 break;
3389 case ISCSI_PARAM_PASSWORD:
3390 len = sprintf(buf, "%s\n", session->password);
3391 break;
3392 case ISCSI_PARAM_PASSWORD_IN:
3393 len = sprintf(buf, "%s\n", session->password_in);
3394 break;
Mike Christie88dfd342008-05-21 15:54:16 -05003395 case ISCSI_PARAM_IFACE_NAME:
3396 len = sprintf(buf, "%s\n", session->ifacename);
3397 break;
3398 case ISCSI_PARAM_INITIATOR_NAME:
Mike Christie5700b1a2009-05-13 17:57:40 -05003399 len = sprintf(buf, "%s\n", session->initiatorname);
Mike Christie88dfd342008-05-21 15:54:16 -05003400 break;
Eddie Wai3b9373e2013-06-20 10:21:26 -07003401 case ISCSI_PARAM_BOOT_ROOT:
3402 len = sprintf(buf, "%s\n", session->boot_root);
3403 break;
3404 case ISCSI_PARAM_BOOT_NIC:
3405 len = sprintf(buf, "%s\n", session->boot_nic);
3406 break;
3407 case ISCSI_PARAM_BOOT_TARGET:
3408 len = sprintf(buf, "%s\n", session->boot_target);
Adheer Chandravanshi9a2307b2013-07-22 07:46:09 -04003409 break;
Adheer Chandravanshif8525eb2013-07-01 05:54:12 -04003410 case ISCSI_PARAM_AUTO_SND_TGT_DISABLE:
3411 len = sprintf(buf, "%u\n", session->auto_snd_tgt_disable);
3412 break;
3413 case ISCSI_PARAM_DISCOVERY_SESS:
3414 len = sprintf(buf, "%u\n", session->discovery_sess);
3415 break;
3416 case ISCSI_PARAM_PORTAL_TYPE:
3417 len = sprintf(buf, "%s\n", session->portal_type);
3418 break;
3419 case ISCSI_PARAM_CHAP_AUTH_EN:
3420 len = sprintf(buf, "%u\n", session->chap_auth_en);
3421 break;
3422 case ISCSI_PARAM_DISCOVERY_LOGOUT_EN:
3423 len = sprintf(buf, "%u\n", session->discovery_logout_en);
3424 break;
3425 case ISCSI_PARAM_BIDI_CHAP_EN:
3426 len = sprintf(buf, "%u\n", session->bidi_chap_en);
3427 break;
3428 case ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL:
3429 len = sprintf(buf, "%u\n", session->discovery_auth_optional);
3430 break;
3431 case ISCSI_PARAM_DEF_TIME2WAIT:
3432 len = sprintf(buf, "%d\n", session->time2wait);
3433 break;
3434 case ISCSI_PARAM_DEF_TIME2RETAIN:
3435 len = sprintf(buf, "%d\n", session->time2retain);
3436 break;
3437 case ISCSI_PARAM_TSID:
3438 len = sprintf(buf, "%u\n", session->tsid);
3439 break;
3440 case ISCSI_PARAM_ISID:
3441 len = sprintf(buf, "%02x%02x%02x%02x%02x%02x\n",
3442 session->isid[0], session->isid[1],
3443 session->isid[2], session->isid[3],
3444 session->isid[4], session->isid[5]);
3445 break;
3446 case ISCSI_PARAM_DISCOVERY_PARENT_IDX:
3447 len = sprintf(buf, "%u\n", session->discovery_parent_idx);
3448 break;
3449 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE:
3450 if (session->discovery_parent_type)
3451 len = sprintf(buf, "%s\n",
3452 session->discovery_parent_type);
3453 else
3454 len = sprintf(buf, "\n");
Eddie Wai3b9373e2013-06-20 10:21:26 -07003455 break;
Mike Christiea54a52c2006-06-28 12:00:23 -05003456 default:
3457 return -ENOSYS;
3458 }
3459
3460 return len;
3461}
3462EXPORT_SYMBOL_GPL(iscsi_session_get_param);
3463
Mike Christie00f37082011-02-16 15:04:35 -06003464int iscsi_conn_get_addr_param(struct sockaddr_storage *addr,
3465 enum iscsi_param param, char *buf)
3466{
3467 struct sockaddr_in6 *sin6 = NULL;
3468 struct sockaddr_in *sin = NULL;
3469 int len;
3470
3471 switch (addr->ss_family) {
3472 case AF_INET:
3473 sin = (struct sockaddr_in *)addr;
3474 break;
3475 case AF_INET6:
3476 sin6 = (struct sockaddr_in6 *)addr;
3477 break;
3478 default:
3479 return -EINVAL;
3480 }
3481
3482 switch (param) {
3483 case ISCSI_PARAM_CONN_ADDRESS:
3484 case ISCSI_HOST_PARAM_IPADDRESS:
3485 if (sin)
3486 len = sprintf(buf, "%pI4\n", &sin->sin_addr.s_addr);
3487 else
3488 len = sprintf(buf, "%pI6\n", &sin6->sin6_addr);
3489 break;
3490 case ISCSI_PARAM_CONN_PORT:
Mike Christie4bfb8ebf2014-09-29 13:55:42 -05003491 case ISCSI_PARAM_LOCAL_PORT:
Mike Christie00f37082011-02-16 15:04:35 -06003492 if (sin)
3493 len = sprintf(buf, "%hu\n", be16_to_cpu(sin->sin_port));
3494 else
3495 len = sprintf(buf, "%hu\n",
3496 be16_to_cpu(sin6->sin6_port));
3497 break;
3498 default:
3499 return -EINVAL;
3500 }
3501
3502 return len;
3503}
3504EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param);
3505
Mike Christiea54a52c2006-06-28 12:00:23 -05003506int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
3507 enum iscsi_param param, char *buf)
3508{
3509 struct iscsi_conn *conn = cls_conn->dd_data;
3510 int len;
3511
3512 switch(param) {
Mike Christief6d51802007-12-13 12:43:30 -06003513 case ISCSI_PARAM_PING_TMO:
3514 len = sprintf(buf, "%u\n", conn->ping_timeout);
3515 break;
3516 case ISCSI_PARAM_RECV_TMO:
3517 len = sprintf(buf, "%u\n", conn->recv_timeout);
3518 break;
Mike Christiea54a52c2006-06-28 12:00:23 -05003519 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3520 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
3521 break;
3522 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3523 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
3524 break;
3525 case ISCSI_PARAM_HDRDGST_EN:
3526 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
3527 break;
3528 case ISCSI_PARAM_DATADGST_EN:
3529 len = sprintf(buf, "%d\n", conn->datadgst_en);
3530 break;
3531 case ISCSI_PARAM_IFMARKER_EN:
3532 len = sprintf(buf, "%d\n", conn->ifmarker_en);
3533 break;
3534 case ISCSI_PARAM_OFMARKER_EN:
3535 len = sprintf(buf, "%d\n", conn->ofmarker_en);
3536 break;
3537 case ISCSI_PARAM_EXP_STATSN:
3538 len = sprintf(buf, "%u\n", conn->exp_statsn);
3539 break;
3540 case ISCSI_PARAM_PERSISTENT_PORT:
3541 len = sprintf(buf, "%d\n", conn->persistent_port);
3542 break;
3543 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3544 len = sprintf(buf, "%s\n", conn->persistent_address);
3545 break;
Adheer Chandravanshif8525eb2013-07-01 05:54:12 -04003546 case ISCSI_PARAM_STATSN:
3547 len = sprintf(buf, "%u\n", conn->statsn);
3548 break;
3549 case ISCSI_PARAM_MAX_SEGMENT_SIZE:
3550 len = sprintf(buf, "%u\n", conn->max_segment_size);
3551 break;
3552 case ISCSI_PARAM_KEEPALIVE_TMO:
3553 len = sprintf(buf, "%u\n", conn->keepalive_tmo);
3554 break;
3555 case ISCSI_PARAM_LOCAL_PORT:
3556 len = sprintf(buf, "%u\n", conn->local_port);
3557 break;
3558 case ISCSI_PARAM_TCP_TIMESTAMP_STAT:
3559 len = sprintf(buf, "%u\n", conn->tcp_timestamp_stat);
3560 break;
3561 case ISCSI_PARAM_TCP_NAGLE_DISABLE:
3562 len = sprintf(buf, "%u\n", conn->tcp_nagle_disable);
3563 break;
3564 case ISCSI_PARAM_TCP_WSF_DISABLE:
3565 len = sprintf(buf, "%u\n", conn->tcp_wsf_disable);
3566 break;
3567 case ISCSI_PARAM_TCP_TIMER_SCALE:
3568 len = sprintf(buf, "%u\n", conn->tcp_timer_scale);
3569 break;
3570 case ISCSI_PARAM_TCP_TIMESTAMP_EN:
3571 len = sprintf(buf, "%u\n", conn->tcp_timestamp_en);
3572 break;
3573 case ISCSI_PARAM_IP_FRAGMENT_DISABLE:
3574 len = sprintf(buf, "%u\n", conn->fragment_disable);
3575 break;
3576 case ISCSI_PARAM_IPV4_TOS:
3577 len = sprintf(buf, "%u\n", conn->ipv4_tos);
3578 break;
3579 case ISCSI_PARAM_IPV6_TC:
3580 len = sprintf(buf, "%u\n", conn->ipv6_traffic_class);
3581 break;
Adheer Chandravanshi5f09e1f2013-07-22 07:46:10 -04003582 case ISCSI_PARAM_IPV6_FLOW_LABEL:
3583 len = sprintf(buf, "%u\n", conn->ipv6_flow_label);
3584 break;
Adheer Chandravanshif8525eb2013-07-01 05:54:12 -04003585 case ISCSI_PARAM_IS_FW_ASSIGNED_IPV6:
3586 len = sprintf(buf, "%u\n", conn->is_fw_assigned_ipv6);
3587 break;
3588 case ISCSI_PARAM_TCP_XMIT_WSF:
3589 len = sprintf(buf, "%u\n", conn->tcp_xmit_wsf);
3590 break;
3591 case ISCSI_PARAM_TCP_RECV_WSF:
3592 len = sprintf(buf, "%u\n", conn->tcp_recv_wsf);
3593 break;
Adheer Chandravanshiae56ff42013-11-22 05:28:21 -05003594 case ISCSI_PARAM_LOCAL_IPADDR:
3595 len = sprintf(buf, "%s\n", conn->local_ipaddr);
3596 break;
Mike Christiea54a52c2006-06-28 12:00:23 -05003597 default:
3598 return -ENOSYS;
3599 }
3600
3601 return len;
3602}
3603EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
3604
Mike Christie0801c242007-05-30 12:57:12 -05003605int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3606 char *buf)
3607{
Mike Christie75613522008-05-21 15:53:59 -05003608 struct iscsi_host *ihost = shost_priv(shost);
Mike Christie0801c242007-05-30 12:57:12 -05003609 int len;
3610
3611 switch (param) {
Mike Christied8196ed2007-05-30 12:57:25 -05003612 case ISCSI_HOST_PARAM_NETDEV_NAME:
Mike Christie5700b1a2009-05-13 17:57:40 -05003613 len = sprintf(buf, "%s\n", ihost->netdev);
Mike Christied8196ed2007-05-30 12:57:25 -05003614 break;
Mike Christie0801c242007-05-30 12:57:12 -05003615 case ISCSI_HOST_PARAM_HWADDRESS:
Mike Christie5700b1a2009-05-13 17:57:40 -05003616 len = sprintf(buf, "%s\n", ihost->hwaddress);
Mike Christie0801c242007-05-30 12:57:12 -05003617 break;
Mike Christie8ad57812007-05-30 12:57:13 -05003618 case ISCSI_HOST_PARAM_INITIATOR_NAME:
Mike Christie5700b1a2009-05-13 17:57:40 -05003619 len = sprintf(buf, "%s\n", ihost->initiatorname);
Mike Christie8ad57812007-05-30 12:57:13 -05003620 break;
Mike Christie0801c242007-05-30 12:57:12 -05003621 default:
3622 return -ENOSYS;
3623 }
3624
3625 return len;
3626}
3627EXPORT_SYMBOL_GPL(iscsi_host_get_param);
3628
3629int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3630 char *buf, int buflen)
3631{
Mike Christie75613522008-05-21 15:53:59 -05003632 struct iscsi_host *ihost = shost_priv(shost);
Mike Christie0801c242007-05-30 12:57:12 -05003633
3634 switch (param) {
Mike Christied8196ed2007-05-30 12:57:25 -05003635 case ISCSI_HOST_PARAM_NETDEV_NAME:
Mike Christie5700b1a2009-05-13 17:57:40 -05003636 return iscsi_switch_str_param(&ihost->netdev, buf);
Mike Christie0801c242007-05-30 12:57:12 -05003637 case ISCSI_HOST_PARAM_HWADDRESS:
Mike Christie5700b1a2009-05-13 17:57:40 -05003638 return iscsi_switch_str_param(&ihost->hwaddress, buf);
Mike Christie8ad57812007-05-30 12:57:13 -05003639 case ISCSI_HOST_PARAM_INITIATOR_NAME:
Mike Christie5700b1a2009-05-13 17:57:40 -05003640 return iscsi_switch_str_param(&ihost->initiatorname, buf);
Mike Christie0801c242007-05-30 12:57:12 -05003641 default:
3642 return -ENOSYS;
3643 }
3644
3645 return 0;
3646}
3647EXPORT_SYMBOL_GPL(iscsi_host_set_param);
3648
Mike Christie7996a772006-04-06 21:13:41 -05003649MODULE_AUTHOR("Mike Christie");
3650MODULE_DESCRIPTION("iSCSI library functions");
3651MODULE_LICENSE("GPL");