17996a778SMike Christie /* 27996a778SMike Christie * iSCSI lib functions 37996a778SMike Christie * 47996a778SMike Christie * Copyright (C) 2006 Red Hat, Inc. All rights reserved. 57996a778SMike Christie * Copyright (C) 2004 - 2006 Mike Christie 67996a778SMike Christie * Copyright (C) 2004 - 2005 Dmitry Yusupov 77996a778SMike Christie * Copyright (C) 2004 - 2005 Alex Aizman 87996a778SMike Christie * maintained by open-iscsi@googlegroups.com 97996a778SMike Christie * 107996a778SMike Christie * This program is free software; you can redistribute it and/or modify 117996a778SMike Christie * it under the terms of the GNU General Public License as published by 127996a778SMike Christie * the Free Software Foundation; either version 2 of the License, or 137996a778SMike Christie * (at your option) any later version. 147996a778SMike Christie * 157996a778SMike Christie * This program is distributed in the hope that it will be useful, 167996a778SMike Christie * but WITHOUT ANY WARRANTY; without even the implied warranty of 177996a778SMike Christie * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 187996a778SMike Christie * GNU General Public License for more details. 197996a778SMike Christie * 207996a778SMike Christie * You should have received a copy of the GNU General Public License 217996a778SMike Christie * along with this program; if not, write to the Free Software 227996a778SMike Christie * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 237996a778SMike Christie */ 247996a778SMike Christie #include <linux/types.h> 257996a778SMike Christie #include <linux/kfifo.h> 267996a778SMike Christie #include <linux/delay.h> 2711836572Svignesh babu #include <linux/log2.h> 285a0e3ad6STejun Heo #include <linux/slab.h> 298eb00539SMike Christie #include <asm/unaligned.h> 307996a778SMike Christie #include <net/tcp.h> 317996a778SMike Christie #include <scsi/scsi_cmnd.h> 327996a778SMike Christie #include <scsi/scsi_device.h> 337996a778SMike Christie #include <scsi/scsi_eh.h> 347996a778SMike Christie #include <scsi/scsi_tcq.h> 357996a778SMike Christie #include <scsi/scsi_host.h> 367996a778SMike Christie #include <scsi/scsi.h> 377996a778SMike Christie #include <scsi/iscsi_proto.h> 387996a778SMike Christie #include <scsi/scsi_transport.h> 397996a778SMike Christie #include <scsi/scsi_transport_iscsi.h> 407996a778SMike Christie #include <scsi/libiscsi.h> 417996a778SMike Christie 42bd2199d4SErez Zilber static int iscsi_dbg_lib_conn; 43bd2199d4SErez Zilber module_param_named(debug_libiscsi_conn, iscsi_dbg_lib_conn, int, 44bd2199d4SErez Zilber S_IRUGO | S_IWUSR); 45bd2199d4SErez Zilber MODULE_PARM_DESC(debug_libiscsi_conn, 46bd2199d4SErez Zilber "Turn on debugging for connections in libiscsi module. " 47bd2199d4SErez Zilber "Set to 1 to turn on, and zero to turn off. Default is off."); 48bd2199d4SErez Zilber 49bd2199d4SErez Zilber static int iscsi_dbg_lib_session; 50bd2199d4SErez Zilber module_param_named(debug_libiscsi_session, iscsi_dbg_lib_session, int, 51bd2199d4SErez Zilber S_IRUGO | S_IWUSR); 52bd2199d4SErez Zilber MODULE_PARM_DESC(debug_libiscsi_session, 53bd2199d4SErez Zilber "Turn on debugging for sessions in libiscsi module. " 54bd2199d4SErez Zilber "Set to 1 to turn on, and zero to turn off. Default is off."); 55bd2199d4SErez Zilber 56bd2199d4SErez Zilber static int iscsi_dbg_lib_eh; 57bd2199d4SErez Zilber module_param_named(debug_libiscsi_eh, iscsi_dbg_lib_eh, int, 58bd2199d4SErez Zilber S_IRUGO | S_IWUSR); 59bd2199d4SErez Zilber MODULE_PARM_DESC(debug_libiscsi_eh, 60bd2199d4SErez Zilber "Turn on debugging for error handling in libiscsi module. " 61bd2199d4SErez Zilber "Set to 1 to turn on, and zero to turn off. Default is off."); 621b2c7af8SMike Christie 631b2c7af8SMike Christie #define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \ 641b2c7af8SMike Christie do { \ 65bd2199d4SErez Zilber if (iscsi_dbg_lib_conn) \ 661b2c7af8SMike Christie iscsi_conn_printk(KERN_INFO, _conn, \ 671b2c7af8SMike Christie "%s " dbg_fmt, \ 681b2c7af8SMike Christie __func__, ##arg); \ 691b2c7af8SMike Christie } while (0); 701b2c7af8SMike Christie 711b2c7af8SMike Christie #define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \ 721b2c7af8SMike Christie do { \ 73bd2199d4SErez Zilber if (iscsi_dbg_lib_session) \ 74bd2199d4SErez Zilber iscsi_session_printk(KERN_INFO, _session, \ 75bd2199d4SErez Zilber "%s " dbg_fmt, \ 76bd2199d4SErez Zilber __func__, ##arg); \ 77bd2199d4SErez Zilber } while (0); 78bd2199d4SErez Zilber 79bd2199d4SErez Zilber #define ISCSI_DBG_EH(_session, dbg_fmt, arg...) \ 80bd2199d4SErez Zilber do { \ 81bd2199d4SErez Zilber if (iscsi_dbg_lib_eh) \ 821b2c7af8SMike Christie iscsi_session_printk(KERN_INFO, _session, \ 831b2c7af8SMike Christie "%s " dbg_fmt, \ 841b2c7af8SMike Christie __func__, ##arg); \ 851b2c7af8SMike Christie } while (0); 861b2c7af8SMike Christie 8777a23c21SMike Christie /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */ 8877a23c21SMike Christie #define SNA32_CHECK 2147483648UL 897996a778SMike Christie 9077a23c21SMike Christie static int iscsi_sna_lt(u32 n1, u32 n2) 9177a23c21SMike Christie { 9277a23c21SMike Christie return n1 != n2 && ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) || 9377a23c21SMike Christie (n1 > n2 && (n2 - n1 < SNA32_CHECK))); 9477a23c21SMike Christie } 9577a23c21SMike Christie 9677a23c21SMike Christie /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */ 9777a23c21SMike Christie static int iscsi_sna_lte(u32 n1, u32 n2) 9877a23c21SMike Christie { 9977a23c21SMike Christie return n1 == n2 || ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) || 10077a23c21SMike Christie (n1 > n2 && (n2 - n1 < SNA32_CHECK))); 10177a23c21SMike Christie } 10277a23c21SMike Christie 10332ae763eSMike Christie inline void iscsi_conn_queue_work(struct iscsi_conn *conn) 10432ae763eSMike Christie { 10532ae763eSMike Christie struct Scsi_Host *shost = conn->session->host; 10632ae763eSMike Christie struct iscsi_host *ihost = shost_priv(shost); 10732ae763eSMike Christie 1081336aed1SMike Christie if (ihost->workq) 10932ae763eSMike Christie queue_work(ihost->workq, &conn->xmitwork); 11032ae763eSMike Christie } 11132ae763eSMike Christie EXPORT_SYMBOL_GPL(iscsi_conn_queue_work); 11232ae763eSMike Christie 1134c0ba5d2SMike Christie static void __iscsi_update_cmdsn(struct iscsi_session *session, 1144c0ba5d2SMike Christie uint32_t exp_cmdsn, uint32_t max_cmdsn) 1157996a778SMike Christie { 11677a23c21SMike Christie /* 11777a23c21SMike Christie * standard specifies this check for when to update expected and 11877a23c21SMike Christie * max sequence numbers 11977a23c21SMike Christie */ 12077a23c21SMike Christie if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1)) 12177a23c21SMike Christie return; 12277a23c21SMike Christie 12377a23c21SMike Christie if (exp_cmdsn != session->exp_cmdsn && 12477a23c21SMike Christie !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn)) 1257996a778SMike Christie session->exp_cmdsn = exp_cmdsn; 1267996a778SMike Christie 12777a23c21SMike Christie if (max_cmdsn != session->max_cmdsn && 12877a23c21SMike Christie !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) { 12977a23c21SMike Christie session->max_cmdsn = max_cmdsn; 13077a23c21SMike Christie /* 13177a23c21SMike Christie * if the window closed with IO queued, then kick the 13277a23c21SMike Christie * xmit thread 13377a23c21SMike Christie */ 1343bbaaad9SMike Christie if (!list_empty(&session->leadconn->cmdqueue) || 1351336aed1SMike Christie !list_empty(&session->leadconn->mgmtqueue)) 13632ae763eSMike Christie iscsi_conn_queue_work(session->leadconn); 1377996a778SMike Christie } 13877a23c21SMike Christie } 1394c0ba5d2SMike Christie 1404c0ba5d2SMike Christie void iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr) 1414c0ba5d2SMike Christie { 1424c0ba5d2SMike Christie __iscsi_update_cmdsn(session, be32_to_cpu(hdr->exp_cmdsn), 1434c0ba5d2SMike Christie be32_to_cpu(hdr->max_cmdsn)); 1444c0ba5d2SMike Christie } 14577a23c21SMike Christie EXPORT_SYMBOL_GPL(iscsi_update_cmdsn); 1467996a778SMike Christie 147577577daSMike Christie /** 148577577daSMike Christie * iscsi_prep_data_out_pdu - initialize Data-Out 149577577daSMike Christie * @task: scsi command task 150577577daSMike Christie * @r2t: R2T info 151577577daSMike Christie * @hdr: iscsi data in pdu 152577577daSMike Christie * 153577577daSMike Christie * Notes: 154577577daSMike Christie * Initialize Data-Out within this R2T sequence and finds 155577577daSMike Christie * proper data_offset within this SCSI command. 156577577daSMike Christie * 157577577daSMike Christie * This function is called with connection lock taken. 158577577daSMike Christie **/ 159577577daSMike Christie void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t, 160ffd0436eSMike Christie struct iscsi_data *hdr) 1617996a778SMike Christie { 1629c19a7d0SMike Christie struct iscsi_conn *conn = task->conn; 163577577daSMike Christie unsigned int left = r2t->data_length - r2t->sent; 164577577daSMike Christie 165577577daSMike Christie task->hdr_len = sizeof(struct iscsi_data); 1667996a778SMike Christie 1677996a778SMike Christie memset(hdr, 0, sizeof(struct iscsi_data)); 168577577daSMike Christie hdr->ttt = r2t->ttt; 169577577daSMike Christie hdr->datasn = cpu_to_be32(r2t->datasn); 170577577daSMike Christie r2t->datasn++; 1717996a778SMike Christie hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; 172577577daSMike Christie memcpy(hdr->lun, task->lun, sizeof(hdr->lun)); 173577577daSMike Christie hdr->itt = task->hdr_itt; 174577577daSMike Christie hdr->exp_statsn = r2t->exp_statsn; 175577577daSMike Christie hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent); 176577577daSMike Christie if (left > conn->max_xmit_dlength) { 1777996a778SMike Christie hton24(hdr->dlength, conn->max_xmit_dlength); 178577577daSMike Christie r2t->data_count = conn->max_xmit_dlength; 1797996a778SMike Christie hdr->flags = 0; 1807996a778SMike Christie } else { 181577577daSMike Christie hton24(hdr->dlength, left); 182577577daSMike Christie r2t->data_count = left; 1837996a778SMike Christie hdr->flags = ISCSI_FLAG_CMD_FINAL; 1847996a778SMike Christie } 185577577daSMike Christie conn->dataout_pdus_cnt++; 1867996a778SMike Christie } 187577577daSMike Christie EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu); 1887996a778SMike Christie 1899c19a7d0SMike Christie static int iscsi_add_hdr(struct iscsi_task *task, unsigned len) 190004d6530SBoaz Harrosh { 1919c19a7d0SMike Christie unsigned exp_len = task->hdr_len + len; 192004d6530SBoaz Harrosh 1939c19a7d0SMike Christie if (exp_len > task->hdr_max) { 194004d6530SBoaz Harrosh WARN_ON(1); 195004d6530SBoaz Harrosh return -EINVAL; 196004d6530SBoaz Harrosh } 197004d6530SBoaz Harrosh 198004d6530SBoaz Harrosh WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */ 1999c19a7d0SMike Christie task->hdr_len = exp_len; 200004d6530SBoaz Harrosh return 0; 201004d6530SBoaz Harrosh } 202004d6530SBoaz Harrosh 20338d1c069SBoaz Harrosh /* 20438d1c069SBoaz Harrosh * make an extended cdb AHS 20538d1c069SBoaz Harrosh */ 2069c19a7d0SMike Christie static int iscsi_prep_ecdb_ahs(struct iscsi_task *task) 20738d1c069SBoaz Harrosh { 2089c19a7d0SMike Christie struct scsi_cmnd *cmd = task->sc; 20938d1c069SBoaz Harrosh unsigned rlen, pad_len; 21038d1c069SBoaz Harrosh unsigned short ahslength; 21138d1c069SBoaz Harrosh struct iscsi_ecdb_ahdr *ecdb_ahdr; 21238d1c069SBoaz Harrosh int rc; 21338d1c069SBoaz Harrosh 2149c19a7d0SMike Christie ecdb_ahdr = iscsi_next_hdr(task); 21538d1c069SBoaz Harrosh rlen = cmd->cmd_len - ISCSI_CDB_SIZE; 21638d1c069SBoaz Harrosh 21738d1c069SBoaz Harrosh BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb)); 21838d1c069SBoaz Harrosh ahslength = rlen + sizeof(ecdb_ahdr->reserved); 21938d1c069SBoaz Harrosh 22038d1c069SBoaz Harrosh pad_len = iscsi_padding(rlen); 22138d1c069SBoaz Harrosh 2229c19a7d0SMike Christie rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) + 22338d1c069SBoaz Harrosh sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len); 22438d1c069SBoaz Harrosh if (rc) 22538d1c069SBoaz Harrosh return rc; 22638d1c069SBoaz Harrosh 22738d1c069SBoaz Harrosh if (pad_len) 22838d1c069SBoaz Harrosh memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len); 22938d1c069SBoaz Harrosh 23038d1c069SBoaz Harrosh ecdb_ahdr->ahslength = cpu_to_be16(ahslength); 23138d1c069SBoaz Harrosh ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB; 23238d1c069SBoaz Harrosh ecdb_ahdr->reserved = 0; 23338d1c069SBoaz Harrosh memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen); 23438d1c069SBoaz Harrosh 2351b2c7af8SMike Christie ISCSI_DBG_SESSION(task->conn->session, 2361b2c7af8SMike Christie "iscsi_prep_ecdb_ahs: varlen_cdb_len %d " 2371b2c7af8SMike Christie "rlen %d pad_len %d ahs_length %d iscsi_headers_size " 2381b2c7af8SMike Christie "%u\n", cmd->cmd_len, rlen, pad_len, ahslength, 2391b2c7af8SMike Christie task->hdr_len); 24038d1c069SBoaz Harrosh return 0; 24138d1c069SBoaz Harrosh } 24238d1c069SBoaz Harrosh 2439c19a7d0SMike Christie static int iscsi_prep_bidi_ahs(struct iscsi_task *task) 244c07d4444SBoaz Harrosh { 2459c19a7d0SMike Christie struct scsi_cmnd *sc = task->sc; 246c07d4444SBoaz Harrosh struct iscsi_rlength_ahdr *rlen_ahdr; 247c07d4444SBoaz Harrosh int rc; 248c07d4444SBoaz Harrosh 2499c19a7d0SMike Christie rlen_ahdr = iscsi_next_hdr(task); 2509c19a7d0SMike Christie rc = iscsi_add_hdr(task, sizeof(*rlen_ahdr)); 251c07d4444SBoaz Harrosh if (rc) 252c07d4444SBoaz Harrosh return rc; 253c07d4444SBoaz Harrosh 254c07d4444SBoaz Harrosh rlen_ahdr->ahslength = 255c07d4444SBoaz Harrosh cpu_to_be16(sizeof(rlen_ahdr->read_length) + 256c07d4444SBoaz Harrosh sizeof(rlen_ahdr->reserved)); 257c07d4444SBoaz Harrosh rlen_ahdr->ahstype = ISCSI_AHSTYPE_RLENGTH; 258c07d4444SBoaz Harrosh rlen_ahdr->reserved = 0; 259c07d4444SBoaz Harrosh rlen_ahdr->read_length = cpu_to_be32(scsi_in(sc)->length); 260c07d4444SBoaz Harrosh 2611b2c7af8SMike Christie ISCSI_DBG_SESSION(task->conn->session, 2621b2c7af8SMike Christie "bidi-in rlen_ahdr->read_length(%d) " 263c07d4444SBoaz Harrosh "rlen_ahdr->ahslength(%d)\n", 264c07d4444SBoaz Harrosh be32_to_cpu(rlen_ahdr->read_length), 265c07d4444SBoaz Harrosh be16_to_cpu(rlen_ahdr->ahslength)); 266c07d4444SBoaz Harrosh return 0; 267c07d4444SBoaz Harrosh } 268c07d4444SBoaz Harrosh 2697996a778SMike Christie /** 2705d12c05eSMike Christie * iscsi_check_tmf_restrictions - check if a task is affected by TMF 2715d12c05eSMike Christie * @task: iscsi task 2725d12c05eSMike Christie * @opcode: opcode to check for 2735d12c05eSMike Christie * 2745d12c05eSMike Christie * During TMF a task has to be checked if it's affected. 2755d12c05eSMike Christie * All unrelated I/O can be passed through, but I/O to the 2765d12c05eSMike Christie * affected LUN should be restricted. 2775d12c05eSMike Christie * If 'fast_abort' is set we won't be sending any I/O to the 2785d12c05eSMike Christie * affected LUN. 2795d12c05eSMike Christie * Otherwise the target is waiting for all TTTs to be completed, 2805d12c05eSMike Christie * so we have to send all outstanding Data-Out PDUs to the target. 2815d12c05eSMike Christie */ 2825d12c05eSMike Christie static int iscsi_check_tmf_restrictions(struct iscsi_task *task, int opcode) 2835d12c05eSMike Christie { 2845d12c05eSMike Christie struct iscsi_conn *conn = task->conn; 2855d12c05eSMike Christie struct iscsi_tm *tmf = &conn->tmhdr; 2865d12c05eSMike Christie unsigned int hdr_lun; 2875d12c05eSMike Christie 2885d12c05eSMike Christie if (conn->tmf_state == TMF_INITIAL) 2895d12c05eSMike Christie return 0; 2905d12c05eSMike Christie 2915d12c05eSMike Christie if ((tmf->opcode & ISCSI_OPCODE_MASK) != ISCSI_OP_SCSI_TMFUNC) 2925d12c05eSMike Christie return 0; 2935d12c05eSMike Christie 2945d12c05eSMike Christie switch (ISCSI_TM_FUNC_VALUE(tmf)) { 2955d12c05eSMike Christie case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 2965d12c05eSMike Christie /* 2975d12c05eSMike Christie * Allow PDUs for unrelated LUNs 2985d12c05eSMike Christie */ 2995d12c05eSMike Christie hdr_lun = scsilun_to_int((struct scsi_lun *)tmf->lun); 3005d12c05eSMike Christie if (hdr_lun != task->sc->device->lun) 3015d12c05eSMike Christie return 0; 3023fe5ae8bSMike Christie /* fall through */ 3033fe5ae8bSMike Christie case ISCSI_TM_FUNC_TARGET_WARM_RESET: 3045d12c05eSMike Christie /* 3055d12c05eSMike Christie * Fail all SCSI cmd PDUs 3065d12c05eSMike Christie */ 3075d12c05eSMike Christie if (opcode != ISCSI_OP_SCSI_DATA_OUT) { 3085d12c05eSMike Christie iscsi_conn_printk(KERN_INFO, conn, 3095d12c05eSMike Christie "task [op %x/%x itt " 3103fe5ae8bSMike Christie "0x%x/0x%x] " 3115d12c05eSMike Christie "rejected.\n", 3125d12c05eSMike Christie task->hdr->opcode, opcode, 3133fe5ae8bSMike Christie task->itt, task->hdr_itt); 3145d12c05eSMike Christie return -EACCES; 3155d12c05eSMike Christie } 3165d12c05eSMike Christie /* 3175d12c05eSMike Christie * And also all data-out PDUs in response to R2T 3185d12c05eSMike Christie * if fast_abort is set. 3195d12c05eSMike Christie */ 3205d12c05eSMike Christie if (conn->session->fast_abort) { 3215d12c05eSMike Christie iscsi_conn_printk(KERN_INFO, conn, 3225d12c05eSMike Christie "task [op %x/%x itt " 3233fe5ae8bSMike Christie "0x%x/0x%x] fast abort.\n", 3245d12c05eSMike Christie task->hdr->opcode, opcode, 3253fe5ae8bSMike Christie task->itt, task->hdr_itt); 3265d12c05eSMike Christie return -EACCES; 3275d12c05eSMike Christie } 3285d12c05eSMike Christie break; 3295d12c05eSMike Christie case ISCSI_TM_FUNC_ABORT_TASK: 3305d12c05eSMike Christie /* 3315d12c05eSMike Christie * the caller has already checked if the task 3325d12c05eSMike Christie * they want to abort was in the pending queue so if 3335d12c05eSMike Christie * we are here the cmd pdu has gone out already, and 3345d12c05eSMike Christie * we will only hit this for data-outs 3355d12c05eSMike Christie */ 3365d12c05eSMike Christie if (opcode == ISCSI_OP_SCSI_DATA_OUT && 3375d12c05eSMike Christie task->hdr_itt == tmf->rtt) { 3385d12c05eSMike Christie ISCSI_DBG_SESSION(conn->session, 3395d12c05eSMike Christie "Preventing task %x/%x from sending " 3405d12c05eSMike Christie "data-out due to abort task in " 3415d12c05eSMike Christie "progress\n", task->itt, 3425d12c05eSMike Christie task->hdr_itt); 3435d12c05eSMike Christie return -EACCES; 3445d12c05eSMike Christie } 3455d12c05eSMike Christie break; 3465d12c05eSMike Christie } 3475d12c05eSMike Christie 3485d12c05eSMike Christie return 0; 3495d12c05eSMike Christie } 3505d12c05eSMike Christie 3515d12c05eSMike Christie /** 3527996a778SMike Christie * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu 3539c19a7d0SMike Christie * @task: iscsi task 3547996a778SMike Christie * 3557996a778SMike Christie * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set 3567996a778SMike Christie * fields like dlength or final based on how much data it sends 3577996a778SMike Christie */ 3589c19a7d0SMike Christie static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task) 3597996a778SMike Christie { 3609c19a7d0SMike Christie struct iscsi_conn *conn = task->conn; 3617996a778SMike Christie struct iscsi_session *session = conn->session; 3629c19a7d0SMike Christie struct scsi_cmnd *sc = task->sc; 363577577daSMike Christie struct iscsi_cmd *hdr; 36438d1c069SBoaz Harrosh unsigned hdrlength, cmd_len; 365262ef636SMike Christie itt_t itt; 366004d6530SBoaz Harrosh int rc; 3677996a778SMike Christie 3685d12c05eSMike Christie rc = iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_CMD); 3695d12c05eSMike Christie if (rc) 3705d12c05eSMike Christie return rc; 3715d12c05eSMike Christie 372184b57c6SMike Christie if (conn->session->tt->alloc_pdu) { 3732ff79d52SMike Christie rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD); 374577577daSMike Christie if (rc) 375577577daSMike Christie return rc; 376184b57c6SMike Christie } 377577577daSMike Christie hdr = (struct iscsi_cmd *) task->hdr; 378262ef636SMike Christie itt = hdr->itt; 379577577daSMike Christie memset(hdr, 0, sizeof(*hdr)); 380577577daSMike Christie 3812ff79d52SMike Christie if (session->tt->parse_pdu_itt) 3822ff79d52SMike Christie hdr->itt = task->hdr_itt = itt; 3832ff79d52SMike Christie else 3842ff79d52SMike Christie hdr->itt = task->hdr_itt = build_itt(task->itt, 3852ff79d52SMike Christie task->conn->session->age); 3869c19a7d0SMike Christie task->hdr_len = 0; 3879c19a7d0SMike Christie rc = iscsi_add_hdr(task, sizeof(*hdr)); 388004d6530SBoaz Harrosh if (rc) 389004d6530SBoaz Harrosh return rc; 3907996a778SMike Christie hdr->opcode = ISCSI_OP_SCSI_CMD; 3917996a778SMike Christie hdr->flags = ISCSI_ATTR_SIMPLE; 3927996a778SMike Christie int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun); 393577577daSMike Christie memcpy(task->lun, hdr->lun, sizeof(task->lun)); 3947996a778SMike Christie hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); 39538d1c069SBoaz Harrosh cmd_len = sc->cmd_len; 39638d1c069SBoaz Harrosh if (cmd_len < ISCSI_CDB_SIZE) 39738d1c069SBoaz Harrosh memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len); 39838d1c069SBoaz Harrosh else if (cmd_len > ISCSI_CDB_SIZE) { 3999c19a7d0SMike Christie rc = iscsi_prep_ecdb_ahs(task); 40038d1c069SBoaz Harrosh if (rc) 40138d1c069SBoaz Harrosh return rc; 40238d1c069SBoaz Harrosh cmd_len = ISCSI_CDB_SIZE; 40338d1c069SBoaz Harrosh } 40438d1c069SBoaz Harrosh memcpy(hdr->cdb, sc->cmnd, cmd_len); 4057996a778SMike Christie 4069c19a7d0SMike Christie task->imm_count = 0; 407c07d4444SBoaz Harrosh if (scsi_bidi_cmnd(sc)) { 408c07d4444SBoaz Harrosh hdr->flags |= ISCSI_FLAG_CMD_READ; 4099c19a7d0SMike Christie rc = iscsi_prep_bidi_ahs(task); 410c07d4444SBoaz Harrosh if (rc) 411c07d4444SBoaz Harrosh return rc; 412c07d4444SBoaz Harrosh } 4137996a778SMike Christie if (sc->sc_data_direction == DMA_TO_DEVICE) { 414c07d4444SBoaz Harrosh unsigned out_len = scsi_out(sc)->length; 415577577daSMike Christie struct iscsi_r2t_info *r2t = &task->unsol_r2t; 416577577daSMike Christie 417c07d4444SBoaz Harrosh hdr->data_length = cpu_to_be32(out_len); 4187996a778SMike Christie hdr->flags |= ISCSI_FLAG_CMD_WRITE; 4197996a778SMike Christie /* 4207996a778SMike Christie * Write counters: 4217996a778SMike Christie * 4227996a778SMike Christie * imm_count bytes to be sent right after 4237996a778SMike Christie * SCSI PDU Header 4247996a778SMike Christie * 4257996a778SMike Christie * unsol_count bytes(as Data-Out) to be sent 4267996a778SMike Christie * without R2T ack right after 4277996a778SMike Christie * immediate data 4287996a778SMike Christie * 429577577daSMike Christie * r2t data_length bytes to be sent via R2T ack's 4307996a778SMike Christie * 4317996a778SMike Christie * pad_count bytes to be sent as zero-padding 4327996a778SMike Christie */ 433577577daSMike Christie memset(r2t, 0, sizeof(*r2t)); 4347996a778SMike Christie 4357996a778SMike Christie if (session->imm_data_en) { 436c07d4444SBoaz Harrosh if (out_len >= session->first_burst) 4379c19a7d0SMike Christie task->imm_count = min(session->first_burst, 4387996a778SMike Christie conn->max_xmit_dlength); 4397996a778SMike Christie else 4409c19a7d0SMike Christie task->imm_count = min(out_len, 4417996a778SMike Christie conn->max_xmit_dlength); 4429c19a7d0SMike Christie hton24(hdr->dlength, task->imm_count); 4437996a778SMike Christie } else 444a8ac6311SOlaf Kirch zero_data(hdr->dlength); 4457996a778SMike Christie 446ffd0436eSMike Christie if (!session->initial_r2t_en) { 447577577daSMike Christie r2t->data_length = min(session->first_burst, out_len) - 448577577daSMike Christie task->imm_count; 449577577daSMike Christie r2t->data_offset = task->imm_count; 450577577daSMike Christie r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); 451577577daSMike Christie r2t->exp_statsn = cpu_to_be32(conn->exp_statsn); 452ffd0436eSMike Christie } 453ffd0436eSMike Christie 454577577daSMike Christie if (!task->unsol_r2t.data_length) 4557996a778SMike Christie /* No unsolicit Data-Out's */ 456a8ac6311SOlaf Kirch hdr->flags |= ISCSI_FLAG_CMD_FINAL; 4577996a778SMike Christie } else { 4587996a778SMike Christie hdr->flags |= ISCSI_FLAG_CMD_FINAL; 4597996a778SMike Christie zero_data(hdr->dlength); 460c07d4444SBoaz Harrosh hdr->data_length = cpu_to_be32(scsi_in(sc)->length); 4617996a778SMike Christie 4627996a778SMike Christie if (sc->sc_data_direction == DMA_FROM_DEVICE) 4637996a778SMike Christie hdr->flags |= ISCSI_FLAG_CMD_READ; 4647996a778SMike Christie } 4657996a778SMike Christie 466004d6530SBoaz Harrosh /* calculate size of additional header segments (AHSs) */ 4679c19a7d0SMike Christie hdrlength = task->hdr_len - sizeof(*hdr); 468004d6530SBoaz Harrosh 469004d6530SBoaz Harrosh WARN_ON(hdrlength & (ISCSI_PAD_LEN-1)); 470004d6530SBoaz Harrosh hdrlength /= ISCSI_PAD_LEN; 471004d6530SBoaz Harrosh 472004d6530SBoaz Harrosh WARN_ON(hdrlength >= 256); 473004d6530SBoaz Harrosh hdr->hlength = hdrlength & 0xFF; 47496b1f96dSMike Christie hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn); 475004d6530SBoaz Harrosh 476577577daSMike Christie if (session->tt->init_task && session->tt->init_task(task)) 477052d0144SMike Christie return -EIO; 478052d0144SMike Christie 4799c19a7d0SMike Christie task->state = ISCSI_TASK_RUNNING; 480d3305f34SMike Christie session->cmdsn++; 48177a23c21SMike Christie 482a8ac6311SOlaf Kirch conn->scsicmd_pdus_cnt++; 4831b2c7af8SMike Christie ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x " 4841b2c7af8SMike Christie "itt 0x%x len %d bidi_len %d cmdsn %d win %d]\n", 4851b2c7af8SMike Christie scsi_bidi_cmnd(sc) ? "bidirectional" : 4861b2c7af8SMike Christie sc->sc_data_direction == DMA_TO_DEVICE ? 4871b2c7af8SMike Christie "write" : "read", conn->id, sc, sc->cmnd[0], 4881b2c7af8SMike Christie task->itt, scsi_bufflen(sc), 4893e5c28adSMike Christie scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0, 4901b2c7af8SMike Christie session->cmdsn, 4911b2c7af8SMike Christie session->max_cmdsn - session->exp_cmdsn + 1); 492004d6530SBoaz Harrosh return 0; 4937996a778SMike Christie } 4947996a778SMike Christie 4957996a778SMike Christie /** 4963bbaaad9SMike Christie * iscsi_free_task - free a task 4979c19a7d0SMike Christie * @task: iscsi cmd task 4987996a778SMike Christie * 4997996a778SMike Christie * Must be called with session lock. 5003e5c28adSMike Christie * This function returns the scsi command to scsi-ml or cleans 5013e5c28adSMike Christie * up mgmt tasks then returns the task to the pool. 5027996a778SMike Christie */ 5033bbaaad9SMike Christie static void iscsi_free_task(struct iscsi_task *task) 5047996a778SMike Christie { 5059c19a7d0SMike Christie struct iscsi_conn *conn = task->conn; 506c1635cb7SMike Christie struct iscsi_session *session = conn->session; 5079c19a7d0SMike Christie struct scsi_cmnd *sc = task->sc; 5087996a778SMike Christie 5094421c9ebSMike Christie ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n", 5104421c9ebSMike Christie task->itt, task->state, task->sc); 5114421c9ebSMike Christie 512577577daSMike Christie session->tt->cleanup_task(task); 5133bbaaad9SMike Christie task->state = ISCSI_TASK_FREE; 5149c19a7d0SMike Christie task->sc = NULL; 5153e5c28adSMike Christie /* 5169c19a7d0SMike Christie * login task is preallocated so do not free 5173e5c28adSMike Christie */ 5189c19a7d0SMike Christie if (conn->login_task == task) 5193e5c28adSMike Christie return; 5203e5c28adSMike Christie 5217acd72ebSStefani Seibold kfifo_in(&session->cmdpool.queue, (void*)&task, sizeof(void*)); 5223e5c28adSMike Christie 5233e5c28adSMike Christie if (sc) { 5249c19a7d0SMike Christie task->sc = NULL; 525f47f2cf5SMike Christie /* SCSI eh reuses commands to verify us */ 526f47f2cf5SMike Christie sc->SCp.ptr = NULL; 5273e5c28adSMike Christie /* 5283e5c28adSMike Christie * queue command may call this to free the task, but 5293e5c28adSMike Christie * not have setup the sc callback 5303e5c28adSMike Christie */ 531052d0144SMike Christie if (sc->scsi_done) 5327996a778SMike Christie sc->scsi_done(sc); 5337996a778SMike Christie } 5343e5c28adSMike Christie } 5357996a778SMike Christie 536913e5bf4SMike Christie void __iscsi_get_task(struct iscsi_task *task) 53760ecebf5SMike Christie { 5389c19a7d0SMike Christie atomic_inc(&task->refcount); 53960ecebf5SMike Christie } 540913e5bf4SMike Christie EXPORT_SYMBOL_GPL(__iscsi_get_task); 54160ecebf5SMike Christie 5428eea2f55SEddie Wai void __iscsi_put_task(struct iscsi_task *task) 54360ecebf5SMike Christie { 5449c19a7d0SMike Christie if (atomic_dec_and_test(&task->refcount)) 5453bbaaad9SMike Christie iscsi_free_task(task); 54660ecebf5SMike Christie } 5478eea2f55SEddie Wai EXPORT_SYMBOL_GPL(__iscsi_put_task); 54860ecebf5SMike Christie 5499c19a7d0SMike Christie void iscsi_put_task(struct iscsi_task *task) 5503e5c28adSMike Christie { 5519c19a7d0SMike Christie struct iscsi_session *session = task->conn->session; 5523e5c28adSMike Christie 5533e5c28adSMike Christie spin_lock_bh(&session->lock); 5549c19a7d0SMike Christie __iscsi_put_task(task); 5553e5c28adSMike Christie spin_unlock_bh(&session->lock); 5563e5c28adSMike Christie } 5579c19a7d0SMike Christie EXPORT_SYMBOL_GPL(iscsi_put_task); 5583e5c28adSMike Christie 5593bbaaad9SMike Christie /** 5603bbaaad9SMike Christie * iscsi_complete_task - finish a task 5613bbaaad9SMike Christie * @task: iscsi cmd task 562b3cd5050SMike Christie * @state: state to complete task with 5633bbaaad9SMike Christie * 5643bbaaad9SMike Christie * Must be called with session lock. 565b3a7ea8dSMike Christie */ 566b3cd5050SMike Christie static void iscsi_complete_task(struct iscsi_task *task, int state) 567b3a7ea8dSMike Christie { 5683bbaaad9SMike Christie struct iscsi_conn *conn = task->conn; 5693bbaaad9SMike Christie 5704421c9ebSMike Christie ISCSI_DBG_SESSION(conn->session, 5714421c9ebSMike Christie "complete task itt 0x%x state %d sc %p\n", 5724421c9ebSMike Christie task->itt, task->state, task->sc); 573b3cd5050SMike Christie if (task->state == ISCSI_TASK_COMPLETED || 574b3cd5050SMike Christie task->state == ISCSI_TASK_ABRT_TMF || 575b3cd5050SMike Christie task->state == ISCSI_TASK_ABRT_SESS_RECOV) 5763bbaaad9SMike Christie return; 5773bbaaad9SMike Christie WARN_ON_ONCE(task->state == ISCSI_TASK_FREE); 578b3cd5050SMike Christie task->state = state; 5793bbaaad9SMike Christie 5803bbaaad9SMike Christie if (!list_empty(&task->running)) 5813bbaaad9SMike Christie list_del_init(&task->running); 5823bbaaad9SMike Christie 5833bbaaad9SMike Christie if (conn->task == task) 5843bbaaad9SMike Christie conn->task = NULL; 5853bbaaad9SMike Christie 5863bbaaad9SMike Christie if (conn->ping_task == task) 5873bbaaad9SMike Christie conn->ping_task = NULL; 5883bbaaad9SMike Christie 5893bbaaad9SMike Christie /* release get from queueing */ 5903bbaaad9SMike Christie __iscsi_put_task(task); 5913bbaaad9SMike Christie } 5923bbaaad9SMike Christie 5934c0ba5d2SMike Christie /** 5944c0ba5d2SMike Christie * iscsi_complete_scsi_task - finish scsi task normally 5954c0ba5d2SMike Christie * @task: iscsi task for scsi cmd 5964c0ba5d2SMike Christie * @exp_cmdsn: expected cmd sn in cpu format 5974c0ba5d2SMike Christie * @max_cmdsn: max cmd sn in cpu format 5984c0ba5d2SMike Christie * 5994c0ba5d2SMike Christie * This is used when drivers do not need or cannot perform 6004c0ba5d2SMike Christie * lower level pdu processing. 6014c0ba5d2SMike Christie * 6024c0ba5d2SMike Christie * Called with session lock 6034c0ba5d2SMike Christie */ 6044c0ba5d2SMike Christie void iscsi_complete_scsi_task(struct iscsi_task *task, 6054c0ba5d2SMike Christie uint32_t exp_cmdsn, uint32_t max_cmdsn) 6064c0ba5d2SMike Christie { 6074c0ba5d2SMike Christie struct iscsi_conn *conn = task->conn; 6084c0ba5d2SMike Christie 6094c0ba5d2SMike Christie ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt); 6104c0ba5d2SMike Christie 6114c0ba5d2SMike Christie conn->last_recv = jiffies; 6124c0ba5d2SMike Christie __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn); 6134c0ba5d2SMike Christie iscsi_complete_task(task, ISCSI_TASK_COMPLETED); 6144c0ba5d2SMike Christie } 6154c0ba5d2SMike Christie EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task); 6164c0ba5d2SMike Christie 6174c0ba5d2SMike Christie 6183bbaaad9SMike Christie /* 6193bbaaad9SMike Christie * session lock must be held and if not called for a task that is 6203bbaaad9SMike Christie * still pending or from the xmit thread, then xmit thread must 6213bbaaad9SMike Christie * be suspended. 6223bbaaad9SMike Christie */ 6233bbaaad9SMike Christie static void fail_scsi_task(struct iscsi_task *task, int err) 6243bbaaad9SMike Christie { 6253bbaaad9SMike Christie struct iscsi_conn *conn = task->conn; 626b3a7ea8dSMike Christie struct scsi_cmnd *sc; 627b3cd5050SMike Christie int state; 628b3a7ea8dSMike Christie 6293bbaaad9SMike Christie /* 6303bbaaad9SMike Christie * if a command completes and we get a successful tmf response 6313bbaaad9SMike Christie * we will hit this because the scsi eh abort code does not take 6323bbaaad9SMike Christie * a ref to the task. 6333bbaaad9SMike Christie */ 6349c19a7d0SMike Christie sc = task->sc; 635b3a7ea8dSMike Christie if (!sc) 636b3a7ea8dSMike Christie return; 637b3a7ea8dSMike Christie 638b3cd5050SMike Christie if (task->state == ISCSI_TASK_PENDING) { 639b3a7ea8dSMike Christie /* 640b3a7ea8dSMike Christie * cmd never made it to the xmit thread, so we should not count 641b3a7ea8dSMike Christie * the cmd in the sequencing 642b3a7ea8dSMike Christie */ 643b3a7ea8dSMike Christie conn->session->queued_cmdsn--; 644b3cd5050SMike Christie /* it was never sent so just complete like normal */ 645b3cd5050SMike Christie state = ISCSI_TASK_COMPLETED; 646b3cd5050SMike Christie } else if (err == DID_TRANSPORT_DISRUPTED) 647b3cd5050SMike Christie state = ISCSI_TASK_ABRT_SESS_RECOV; 648b3cd5050SMike Christie else 649b3cd5050SMike Christie state = ISCSI_TASK_ABRT_TMF; 650b3a7ea8dSMike Christie 651b3cd5050SMike Christie sc->result = err << 16; 652c07d4444SBoaz Harrosh if (!scsi_bidi_cmnd(sc)) 653b3a7ea8dSMike Christie scsi_set_resid(sc, scsi_bufflen(sc)); 654c07d4444SBoaz Harrosh else { 655c07d4444SBoaz Harrosh scsi_out(sc)->resid = scsi_out(sc)->length; 656c07d4444SBoaz Harrosh scsi_in(sc)->resid = scsi_in(sc)->length; 657c07d4444SBoaz Harrosh } 6583e5c28adSMike Christie 659b3cd5050SMike Christie iscsi_complete_task(task, state); 660b3a7ea8dSMike Christie } 661b3a7ea8dSMike Christie 6623e5c28adSMike Christie static int iscsi_prep_mgmt_task(struct iscsi_conn *conn, 6639c19a7d0SMike Christie struct iscsi_task *task) 664052d0144SMike Christie { 665052d0144SMike Christie struct iscsi_session *session = conn->session; 666577577daSMike Christie struct iscsi_hdr *hdr = task->hdr; 667052d0144SMike Christie struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; 6684f704dc0SMike Christie uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK; 669052d0144SMike Christie 670052d0144SMike Christie if (conn->session->state == ISCSI_STATE_LOGGING_OUT) 671052d0144SMike Christie return -ENOTCONN; 672052d0144SMike Christie 6734f704dc0SMike Christie if (opcode != ISCSI_OP_LOGIN && opcode != ISCSI_OP_TEXT) 674052d0144SMike Christie nop->exp_statsn = cpu_to_be32(conn->exp_statsn); 675052d0144SMike Christie /* 676052d0144SMike Christie * pre-format CmdSN for outgoing PDU. 677052d0144SMike Christie */ 678052d0144SMike Christie nop->cmdsn = cpu_to_be32(session->cmdsn); 679052d0144SMike Christie if (hdr->itt != RESERVED_ITT) { 680052d0144SMike Christie /* 6814f704dc0SMike Christie * TODO: We always use immediate for normal session pdus. 682052d0144SMike Christie * If we start to send tmfs or nops as non-immediate then 683052d0144SMike Christie * we should start checking the cmdsn numbers for mgmt tasks. 6844f704dc0SMike Christie * 6854f704dc0SMike Christie * During discovery sessions iscsid sends TEXT as non immediate, 6864f704dc0SMike Christie * but we always only send one PDU at a time. 687052d0144SMike Christie */ 688052d0144SMike Christie if (conn->c_stage == ISCSI_CONN_STARTED && 689052d0144SMike Christie !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 690052d0144SMike Christie session->queued_cmdsn++; 691052d0144SMike Christie session->cmdsn++; 692052d0144SMike Christie } 693052d0144SMike Christie } 694052d0144SMike Christie 695ae15f801SMike Christie if (session->tt->init_task && session->tt->init_task(task)) 696ae15f801SMike Christie return -EIO; 697052d0144SMike Christie 698052d0144SMike Christie if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) 699052d0144SMike Christie session->state = ISCSI_STATE_LOGGING_OUT; 700052d0144SMike Christie 701577577daSMike Christie task->state = ISCSI_TASK_RUNNING; 7021b2c7af8SMike Christie ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x " 7031b2c7af8SMike Christie "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK, 7041b2c7af8SMike Christie hdr->itt, task->data_count); 705052d0144SMike Christie return 0; 706052d0144SMike Christie } 707052d0144SMike Christie 7089c19a7d0SMike Christie static struct iscsi_task * 709f6d5180cSMike Christie __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 710f6d5180cSMike Christie char *data, uint32_t data_size) 711f6d5180cSMike Christie { 712f6d5180cSMike Christie struct iscsi_session *session = conn->session; 7131336aed1SMike Christie struct iscsi_host *ihost = shost_priv(session->host); 7144f704dc0SMike Christie uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK; 7159c19a7d0SMike Christie struct iscsi_task *task; 716262ef636SMike Christie itt_t itt; 717f6d5180cSMike Christie 718f6d5180cSMike Christie if (session->state == ISCSI_STATE_TERMINATE) 719f6d5180cSMike Christie return NULL; 720f6d5180cSMike Christie 7214f704dc0SMike Christie if (opcode == ISCSI_OP_LOGIN || opcode == ISCSI_OP_TEXT) { 722f6d5180cSMike Christie /* 723f6d5180cSMike Christie * Login and Text are sent serially, in 724f6d5180cSMike Christie * request-followed-by-response sequence. 7253e5c28adSMike Christie * Same task can be used. Same ITT must be used. 7263e5c28adSMike Christie * Note that login_task is preallocated at conn_create(). 727f6d5180cSMike Christie */ 7284f704dc0SMike Christie if (conn->login_task->state != ISCSI_TASK_FREE) { 7294f704dc0SMike Christie iscsi_conn_printk(KERN_ERR, conn, "Login/Text in " 7304f704dc0SMike Christie "progress. Cannot start new task.\n"); 7314f704dc0SMike Christie return NULL; 7324f704dc0SMike Christie } 7334f704dc0SMike Christie 7349c19a7d0SMike Christie task = conn->login_task; 7354f704dc0SMike Christie } else { 73626013ad4SMike Christie if (session->state != ISCSI_STATE_LOGGED_IN) 73726013ad4SMike Christie return NULL; 73826013ad4SMike Christie 739f6d5180cSMike Christie BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); 740f6d5180cSMike Christie BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); 741f6d5180cSMike Christie 7427acd72ebSStefani Seibold if (!kfifo_out(&session->cmdpool.queue, 7439c19a7d0SMike Christie (void*)&task, sizeof(void*))) 744f6d5180cSMike Christie return NULL; 745f6d5180cSMike Christie } 7463e5c28adSMike Christie /* 7473e5c28adSMike Christie * released in complete pdu for task we expect a response for, and 7483e5c28adSMike Christie * released by the lld when it has transmitted the task for 7493e5c28adSMike Christie * pdus we do not expect a response for. 7503e5c28adSMike Christie */ 7519c19a7d0SMike Christie atomic_set(&task->refcount, 1); 7529c19a7d0SMike Christie task->conn = conn; 7539c19a7d0SMike Christie task->sc = NULL; 7543bbaaad9SMike Christie INIT_LIST_HEAD(&task->running); 7553bbaaad9SMike Christie task->state = ISCSI_TASK_PENDING; 756f6d5180cSMike Christie 757f6d5180cSMike Christie if (data_size) { 7589c19a7d0SMike Christie memcpy(task->data, data, data_size); 7599c19a7d0SMike Christie task->data_count = data_size; 760f6d5180cSMike Christie } else 7619c19a7d0SMike Christie task->data_count = 0; 762f6d5180cSMike Christie 763184b57c6SMike Christie if (conn->session->tt->alloc_pdu) { 7642ff79d52SMike Christie if (conn->session->tt->alloc_pdu(task, hdr->opcode)) { 765577577daSMike Christie iscsi_conn_printk(KERN_ERR, conn, "Could not allocate " 766577577daSMike Christie "pdu for mgmt task.\n"); 7673bbaaad9SMike Christie goto free_task; 768577577daSMike Christie } 769184b57c6SMike Christie } 770184b57c6SMike Christie 771262ef636SMike Christie itt = task->hdr->itt; 772577577daSMike Christie task->hdr_len = sizeof(struct iscsi_hdr); 7739c19a7d0SMike Christie memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr)); 774262ef636SMike Christie 775262ef636SMike Christie if (hdr->itt != RESERVED_ITT) { 776262ef636SMike Christie if (session->tt->parse_pdu_itt) 777262ef636SMike Christie task->hdr->itt = itt; 778262ef636SMike Christie else 779262ef636SMike Christie task->hdr->itt = build_itt(task->itt, 780262ef636SMike Christie task->conn->session->age); 781262ef636SMike Christie } 782262ef636SMike Christie 7831336aed1SMike Christie if (!ihost->workq) { 784577577daSMike Christie if (iscsi_prep_mgmt_task(conn, task)) 785577577daSMike Christie goto free_task; 786052d0144SMike Christie 7879c19a7d0SMike Christie if (session->tt->xmit_task(task)) 788577577daSMike Christie goto free_task; 7893bbaaad9SMike Christie } else { 7903bbaaad9SMike Christie list_add_tail(&task->running, &conn->mgmtqueue); 79132ae763eSMike Christie iscsi_conn_queue_work(conn); 7923bbaaad9SMike Christie } 793052d0144SMike Christie 7949c19a7d0SMike Christie return task; 795577577daSMike Christie 796577577daSMike Christie free_task: 797577577daSMike Christie __iscsi_put_task(task); 798577577daSMike Christie return NULL; 799f6d5180cSMike Christie } 800f6d5180cSMike Christie 801f6d5180cSMike Christie int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, 802f6d5180cSMike Christie char *data, uint32_t data_size) 803f6d5180cSMike Christie { 804f6d5180cSMike Christie struct iscsi_conn *conn = cls_conn->dd_data; 805f6d5180cSMike Christie struct iscsi_session *session = conn->session; 806f6d5180cSMike Christie int err = 0; 807f6d5180cSMike Christie 808f6d5180cSMike Christie spin_lock_bh(&session->lock); 809f6d5180cSMike Christie if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size)) 810f6d5180cSMike Christie err = -EPERM; 811f6d5180cSMike Christie spin_unlock_bh(&session->lock); 812f6d5180cSMike Christie return err; 813f6d5180cSMike Christie } 814f6d5180cSMike Christie EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); 815f6d5180cSMike Christie 8167996a778SMike Christie /** 8177996a778SMike Christie * iscsi_cmd_rsp - SCSI Command Response processing 8187996a778SMike Christie * @conn: iscsi connection 8197996a778SMike Christie * @hdr: iscsi header 8209c19a7d0SMike Christie * @task: scsi command task 8217996a778SMike Christie * @data: cmd data buffer 8227996a778SMike Christie * @datalen: len of buffer 8237996a778SMike Christie * 8247996a778SMike Christie * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and 8259c19a7d0SMike Christie * then completes the command and task. 8267996a778SMike Christie **/ 82777a23c21SMike Christie static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 8289c19a7d0SMike Christie struct iscsi_task *task, char *data, 8297996a778SMike Christie int datalen) 8307996a778SMike Christie { 8317996a778SMike Christie struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr; 8327996a778SMike Christie struct iscsi_session *session = conn->session; 8339c19a7d0SMike Christie struct scsi_cmnd *sc = task->sc; 8347996a778SMike Christie 83577a23c21SMike Christie iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); 8367996a778SMike Christie conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; 8377996a778SMike Christie 8387996a778SMike Christie sc->result = (DID_OK << 16) | rhdr->cmd_status; 8397996a778SMike Christie 8407996a778SMike Christie if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { 8417996a778SMike Christie sc->result = DID_ERROR << 16; 8427996a778SMike Christie goto out; 8437996a778SMike Christie } 8447996a778SMike Christie 8457996a778SMike Christie if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) { 8469b80cb4bSMike Christie uint16_t senselen; 8477996a778SMike Christie 8487996a778SMike Christie if (datalen < 2) { 8497996a778SMike Christie invalid_datalen: 850322d739dSMike Christie iscsi_conn_printk(KERN_ERR, conn, 851322d739dSMike Christie "Got CHECK_CONDITION but invalid data " 852322d739dSMike Christie "buffer size of %d\n", datalen); 8537996a778SMike Christie sc->result = DID_BAD_TARGET << 16; 8547996a778SMike Christie goto out; 8557996a778SMike Christie } 8567996a778SMike Christie 8578f333991SHarvey Harrison senselen = get_unaligned_be16(data); 8587996a778SMike Christie if (datalen < senselen) 8597996a778SMike Christie goto invalid_datalen; 8607996a778SMike Christie 8617996a778SMike Christie memcpy(sc->sense_buffer, data + 2, 8629b80cb4bSMike Christie min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); 8631b2c7af8SMike Christie ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n", 8641b2c7af8SMike Christie min_t(uint16_t, senselen, 8651b2c7af8SMike Christie SCSI_SENSE_BUFFERSIZE)); 8667996a778SMike Christie } 8677996a778SMike Christie 868c07d4444SBoaz Harrosh if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW | 869c07d4444SBoaz Harrosh ISCSI_FLAG_CMD_BIDI_OVERFLOW)) { 870c07d4444SBoaz Harrosh int res_count = be32_to_cpu(rhdr->bi_residual_count); 871c07d4444SBoaz Harrosh 872c07d4444SBoaz Harrosh if (scsi_bidi_cmnd(sc) && res_count > 0 && 873c07d4444SBoaz Harrosh (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW || 874c07d4444SBoaz Harrosh res_count <= scsi_in(sc)->length)) 875c07d4444SBoaz Harrosh scsi_in(sc)->resid = res_count; 876c07d4444SBoaz Harrosh else 877c07d4444SBoaz Harrosh sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; 878c07d4444SBoaz Harrosh } 879c07d4444SBoaz Harrosh 8807207fea4SBoaz Harrosh if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW | 8817207fea4SBoaz Harrosh ISCSI_FLAG_CMD_OVERFLOW)) { 8827996a778SMike Christie int res_count = be32_to_cpu(rhdr->residual_count); 8837996a778SMike Christie 8847207fea4SBoaz Harrosh if (res_count > 0 && 8857207fea4SBoaz Harrosh (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || 8867207fea4SBoaz Harrosh res_count <= scsi_bufflen(sc))) 887c07d4444SBoaz Harrosh /* write side for bidi or uni-io set_resid */ 8881c138991SFUJITA Tomonori scsi_set_resid(sc, res_count); 8897996a778SMike Christie else 8907996a778SMike Christie sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; 891c07d4444SBoaz Harrosh } 8927996a778SMike Christie out: 8933bbaaad9SMike Christie ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n", 8941b2c7af8SMike Christie sc, sc->result, task->itt); 8957996a778SMike Christie conn->scsirsp_pdus_cnt++; 896b3cd5050SMike Christie iscsi_complete_task(task, ISCSI_TASK_COMPLETED); 8977996a778SMike Christie } 8987996a778SMike Christie 8991d9edf02SMike Christie /** 9001d9edf02SMike Christie * iscsi_data_in_rsp - SCSI Data-In Response processing 9011d9edf02SMike Christie * @conn: iscsi connection 9021d9edf02SMike Christie * @hdr: iscsi pdu 9031d9edf02SMike Christie * @task: scsi command task 9041d9edf02SMike Christie **/ 9051d9edf02SMike Christie static void 9061d9edf02SMike Christie iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 9071d9edf02SMike Christie struct iscsi_task *task) 9081d9edf02SMike Christie { 9091d9edf02SMike Christie struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr; 9101d9edf02SMike Christie struct scsi_cmnd *sc = task->sc; 9111d9edf02SMike Christie 9121d9edf02SMike Christie if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS)) 9131d9edf02SMike Christie return; 9141d9edf02SMike Christie 915edbc9aa0SMike Christie iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr); 9161d9edf02SMike Christie sc->result = (DID_OK << 16) | rhdr->cmd_status; 9171d9edf02SMike Christie conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; 9181d9edf02SMike Christie if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW | 9191d9edf02SMike Christie ISCSI_FLAG_DATA_OVERFLOW)) { 9201d9edf02SMike Christie int res_count = be32_to_cpu(rhdr->residual_count); 9211d9edf02SMike Christie 9221d9edf02SMike Christie if (res_count > 0 && 9231d9edf02SMike Christie (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || 9241d9edf02SMike Christie res_count <= scsi_in(sc)->length)) 9251d9edf02SMike Christie scsi_in(sc)->resid = res_count; 9261d9edf02SMike Christie else 9271d9edf02SMike Christie sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; 9281d9edf02SMike Christie } 9291d9edf02SMike Christie 9303bbaaad9SMike Christie ISCSI_DBG_SESSION(conn->session, "data in with status done " 9313bbaaad9SMike Christie "[sc %p res %d itt 0x%x]\n", 9323bbaaad9SMike Christie sc, sc->result, task->itt); 9331d9edf02SMike Christie conn->scsirsp_pdus_cnt++; 934b3cd5050SMike Christie iscsi_complete_task(task, ISCSI_TASK_COMPLETED); 9351d9edf02SMike Christie } 9361d9edf02SMike Christie 9377ea8b828SMike Christie static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) 9387ea8b828SMike Christie { 9397ea8b828SMike Christie struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr; 9407ea8b828SMike Christie 9417ea8b828SMike Christie conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; 9427ea8b828SMike Christie conn->tmfrsp_pdus_cnt++; 9437ea8b828SMike Christie 944843c0a8aSMike Christie if (conn->tmf_state != TMF_QUEUED) 9457ea8b828SMike Christie return; 9467ea8b828SMike Christie 9477ea8b828SMike Christie if (tmf->response == ISCSI_TMF_RSP_COMPLETE) 948843c0a8aSMike Christie conn->tmf_state = TMF_SUCCESS; 9497ea8b828SMike Christie else if (tmf->response == ISCSI_TMF_RSP_NO_TASK) 950843c0a8aSMike Christie conn->tmf_state = TMF_NOT_FOUND; 9517ea8b828SMike Christie else 952843c0a8aSMike Christie conn->tmf_state = TMF_FAILED; 9537ea8b828SMike Christie wake_up(&conn->ehwait); 9547ea8b828SMike Christie } 9557ea8b828SMike Christie 956f6d5180cSMike Christie static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr) 957f6d5180cSMike Christie { 958f6d5180cSMike Christie struct iscsi_nopout hdr; 9599c19a7d0SMike Christie struct iscsi_task *task; 960f6d5180cSMike Christie 9619c19a7d0SMike Christie if (!rhdr && conn->ping_task) 962f6d5180cSMike Christie return; 963f6d5180cSMike Christie 964f6d5180cSMike Christie memset(&hdr, 0, sizeof(struct iscsi_nopout)); 965f6d5180cSMike Christie hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE; 966f6d5180cSMike Christie hdr.flags = ISCSI_FLAG_CMD_FINAL; 967f6d5180cSMike Christie 968f6d5180cSMike Christie if (rhdr) { 969f6d5180cSMike Christie memcpy(hdr.lun, rhdr->lun, 8); 970f6d5180cSMike Christie hdr.ttt = rhdr->ttt; 971f6d5180cSMike Christie hdr.itt = RESERVED_ITT; 972f6d5180cSMike Christie } else 973f6d5180cSMike Christie hdr.ttt = RESERVED_ITT; 974f6d5180cSMike Christie 9759c19a7d0SMike Christie task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0); 9769c19a7d0SMike Christie if (!task) 977322d739dSMike Christie iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n"); 978d3acf022SMike Christie else if (!rhdr) { 979d3acf022SMike Christie /* only track our nops */ 980d3acf022SMike Christie conn->ping_task = task; 981d3acf022SMike Christie conn->last_ping = jiffies; 982d3acf022SMike Christie } 983f6d5180cSMike Christie } 984f6d5180cSMike Christie 9858afa1439SMike Christie static int iscsi_nop_out_rsp(struct iscsi_task *task, 9868afa1439SMike Christie struct iscsi_nopin *nop, char *data, int datalen) 9878afa1439SMike Christie { 9888afa1439SMike Christie struct iscsi_conn *conn = task->conn; 9898afa1439SMike Christie int rc = 0; 9908afa1439SMike Christie 9918afa1439SMike Christie if (conn->ping_task != task) { 9928afa1439SMike Christie /* 9938afa1439SMike Christie * If this is not in response to one of our 9948afa1439SMike Christie * nops then it must be from userspace. 9958afa1439SMike Christie */ 9968afa1439SMike Christie if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop, 9978afa1439SMike Christie data, datalen)) 9988afa1439SMike Christie rc = ISCSI_ERR_CONN_FAILED; 9998afa1439SMike Christie } else 10008afa1439SMike Christie mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout); 10018afa1439SMike Christie iscsi_complete_task(task, ISCSI_TASK_COMPLETED); 10028afa1439SMike Christie return rc; 10038afa1439SMike Christie } 10048afa1439SMike Christie 100562f38300SMike Christie static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 100662f38300SMike Christie char *data, int datalen) 100762f38300SMike Christie { 100862f38300SMike Christie struct iscsi_reject *reject = (struct iscsi_reject *)hdr; 100962f38300SMike Christie struct iscsi_hdr rejected_pdu; 10108afa1439SMike Christie int opcode, rc = 0; 101162f38300SMike Christie 101262f38300SMike Christie conn->exp_statsn = be32_to_cpu(reject->statsn) + 1; 101362f38300SMike Christie 10148afa1439SMike Christie if (ntoh24(reject->dlength) > datalen || 10158afa1439SMike Christie ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) { 10168afa1439SMike Christie iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected " 10178afa1439SMike Christie "pdu. Invalid data length (pdu dlength " 10188afa1439SMike Christie "%u, datalen %d\n", ntoh24(reject->dlength), 10198afa1439SMike Christie datalen); 102062f38300SMike Christie return ISCSI_ERR_PROTO; 10218afa1439SMike Christie } 102262f38300SMike Christie memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr)); 10238afa1439SMike Christie opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK; 10248afa1439SMike Christie 10258afa1439SMike Christie switch (reject->reason) { 10268afa1439SMike Christie case ISCSI_REASON_DATA_DIGEST_ERROR: 1027322d739dSMike Christie iscsi_conn_printk(KERN_ERR, conn, 10288afa1439SMike Christie "pdu (op 0x%x itt 0x%x) rejected " 1029262ef636SMike Christie "due to DataDigest error.\n", 10308afa1439SMike Christie rejected_pdu.itt, opcode); 10318afa1439SMike Christie break; 10328afa1439SMike Christie case ISCSI_REASON_IMM_CMD_REJECT: 10338afa1439SMike Christie iscsi_conn_printk(KERN_ERR, conn, 10348afa1439SMike Christie "pdu (op 0x%x itt 0x%x) rejected. Too many " 10358afa1439SMike Christie "immediate commands.\n", 10368afa1439SMike Christie rejected_pdu.itt, opcode); 10378afa1439SMike Christie /* 10388afa1439SMike Christie * We only send one TMF at a time so if the target could not 10398afa1439SMike Christie * handle it, then it should get fixed (RFC mandates that 10408afa1439SMike Christie * a target can handle one immediate TMF per conn). 10418afa1439SMike Christie * 10428afa1439SMike Christie * For nops-outs, we could have sent more than one if 10438afa1439SMike Christie * the target is sending us lots of nop-ins 10448afa1439SMike Christie */ 10458afa1439SMike Christie if (opcode != ISCSI_OP_NOOP_OUT) 104662f38300SMike Christie return 0; 10478afa1439SMike Christie 10488afa1439SMike Christie if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG)) 10498afa1439SMike Christie /* 10508afa1439SMike Christie * nop-out in response to target's nop-out rejected. 10518afa1439SMike Christie * Just resend. 10528afa1439SMike Christie */ 10538afa1439SMike Christie iscsi_send_nopout(conn, 10548afa1439SMike Christie (struct iscsi_nopin*)&rejected_pdu); 10558afa1439SMike Christie else { 10568afa1439SMike Christie struct iscsi_task *task; 10578afa1439SMike Christie /* 10588afa1439SMike Christie * Our nop as ping got dropped. We know the target 10598afa1439SMike Christie * and transport are ok so just clean up 10608afa1439SMike Christie */ 10618afa1439SMike Christie task = iscsi_itt_to_task(conn, rejected_pdu.itt); 10628afa1439SMike Christie if (!task) { 10638afa1439SMike Christie iscsi_conn_printk(KERN_ERR, conn, 10648afa1439SMike Christie "Invalid pdu reject. Could " 10658afa1439SMike Christie "not lookup rejected task.\n"); 10668afa1439SMike Christie rc = ISCSI_ERR_BAD_ITT; 10678afa1439SMike Christie } else 10688afa1439SMike Christie rc = iscsi_nop_out_rsp(task, 10698afa1439SMike Christie (struct iscsi_nopin*)&rejected_pdu, 10708afa1439SMike Christie NULL, 0); 10718afa1439SMike Christie } 10728afa1439SMike Christie break; 10738afa1439SMike Christie default: 10748afa1439SMike Christie iscsi_conn_printk(KERN_ERR, conn, 10758afa1439SMike Christie "pdu (op 0x%x itt 0x%x) rejected. Reason " 10768afa1439SMike Christie "code 0x%x\n", rejected_pdu.itt, 10778afa1439SMike Christie rejected_pdu.opcode, reject->reason); 10788afa1439SMike Christie break; 10798afa1439SMike Christie } 10808afa1439SMike Christie return rc; 108162f38300SMike Christie } 108262f38300SMike Christie 10837996a778SMike Christie /** 1084913e5bf4SMike Christie * iscsi_itt_to_task - look up task by itt 1085913e5bf4SMike Christie * @conn: iscsi connection 1086913e5bf4SMike Christie * @itt: itt 1087913e5bf4SMike Christie * 1088913e5bf4SMike Christie * This should be used for mgmt tasks like login and nops, or if 1089913e5bf4SMike Christie * the LDD's itt space does not include the session age. 1090913e5bf4SMike Christie * 1091913e5bf4SMike Christie * The session lock must be held. 1092913e5bf4SMike Christie */ 10938f9256ceSMike Christie struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt) 1094913e5bf4SMike Christie { 1095913e5bf4SMike Christie struct iscsi_session *session = conn->session; 1096262ef636SMike Christie int i; 1097913e5bf4SMike Christie 1098913e5bf4SMike Christie if (itt == RESERVED_ITT) 1099913e5bf4SMike Christie return NULL; 1100913e5bf4SMike Christie 1101262ef636SMike Christie if (session->tt->parse_pdu_itt) 1102262ef636SMike Christie session->tt->parse_pdu_itt(conn, itt, &i, NULL); 1103262ef636SMike Christie else 1104913e5bf4SMike Christie i = get_itt(itt); 1105913e5bf4SMike Christie if (i >= session->cmds_max) 1106913e5bf4SMike Christie return NULL; 1107913e5bf4SMike Christie 1108913e5bf4SMike Christie return session->cmds[i]; 1109913e5bf4SMike Christie } 11108f9256ceSMike Christie EXPORT_SYMBOL_GPL(iscsi_itt_to_task); 1111913e5bf4SMike Christie 1112913e5bf4SMike Christie /** 11137996a778SMike Christie * __iscsi_complete_pdu - complete pdu 11147996a778SMike Christie * @conn: iscsi conn 11157996a778SMike Christie * @hdr: iscsi header 11167996a778SMike Christie * @data: data buffer 11177996a778SMike Christie * @datalen: len of data buffer 11187996a778SMike Christie * 11197996a778SMike Christie * Completes pdu processing by freeing any resources allocated at 11207996a778SMike Christie * queuecommand or send generic. session lock must be held and verify 11217996a778SMike Christie * itt must have been called. 11227996a778SMike Christie */ 1123913e5bf4SMike Christie int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 11247996a778SMike Christie char *data, int datalen) 11257996a778SMike Christie { 11267996a778SMike Christie struct iscsi_session *session = conn->session; 11277996a778SMike Christie int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0; 11289c19a7d0SMike Christie struct iscsi_task *task; 11297996a778SMike Christie uint32_t itt; 11307996a778SMike Christie 1131f6d5180cSMike Christie conn->last_recv = jiffies; 11320af967f5SMike Christie rc = iscsi_verify_itt(conn, hdr->itt); 11330af967f5SMike Christie if (rc) 11340af967f5SMike Christie return rc; 11350af967f5SMike Christie 1136b4377356SAl Viro if (hdr->itt != RESERVED_ITT) 1137b4377356SAl Viro itt = get_itt(hdr->itt); 11387996a778SMike Christie else 1139b4377356SAl Viro itt = ~0U; 11407996a778SMike Christie 11411b2c7af8SMike Christie ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n", 11423e5c28adSMike Christie opcode, conn->id, itt, datalen); 11437996a778SMike Christie 11443e5c28adSMike Christie if (itt == ~0U) { 114577a23c21SMike Christie iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); 114662f38300SMike Christie 11477996a778SMike Christie switch(opcode) { 11487996a778SMike Christie case ISCSI_OP_NOOP_IN: 114940527afeSMike Christie if (datalen) { 115040527afeSMike Christie rc = ISCSI_ERR_PROTO; 115140527afeSMike Christie break; 115240527afeSMike Christie } 115340527afeSMike Christie 1154b4377356SAl Viro if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG)) 115540527afeSMike Christie break; 115640527afeSMike Christie 1157f6d5180cSMike Christie iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr); 11587996a778SMike Christie break; 11597996a778SMike Christie case ISCSI_OP_REJECT: 116062f38300SMike Christie rc = iscsi_handle_reject(conn, hdr, data, datalen); 116162f38300SMike Christie break; 11627996a778SMike Christie case ISCSI_OP_ASYNC_EVENT: 11638d2860b3SMike Christie conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; 11645831c737SMike Christie if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) 11655831c737SMike Christie rc = ISCSI_ERR_CONN_FAILED; 11667996a778SMike Christie break; 11677996a778SMike Christie default: 11687996a778SMike Christie rc = ISCSI_ERR_BAD_OPCODE; 11697996a778SMike Christie break; 11707996a778SMike Christie } 11713e5c28adSMike Christie goto out; 11723e5c28adSMike Christie } 11737996a778SMike Christie 11743e5c28adSMike Christie switch(opcode) { 11753e5c28adSMike Christie case ISCSI_OP_SCSI_CMD_RSP: 1176913e5bf4SMike Christie case ISCSI_OP_SCSI_DATA_IN: 1177913e5bf4SMike Christie task = iscsi_itt_to_ctask(conn, hdr->itt); 1178913e5bf4SMike Christie if (!task) 1179913e5bf4SMike Christie return ISCSI_ERR_BAD_ITT; 1180d355e57dSMike Christie task->last_xfer = jiffies; 11813e5c28adSMike Christie break; 1182913e5bf4SMike Christie case ISCSI_OP_R2T: 1183913e5bf4SMike Christie /* 1184913e5bf4SMike Christie * LLD handles R2Ts if they need to. 1185913e5bf4SMike Christie */ 1186913e5bf4SMike Christie return 0; 1187913e5bf4SMike Christie case ISCSI_OP_LOGOUT_RSP: 1188913e5bf4SMike Christie case ISCSI_OP_LOGIN_RSP: 1189913e5bf4SMike Christie case ISCSI_OP_TEXT_RSP: 1190913e5bf4SMike Christie case ISCSI_OP_SCSI_TMFUNC_RSP: 1191913e5bf4SMike Christie case ISCSI_OP_NOOP_IN: 1192913e5bf4SMike Christie task = iscsi_itt_to_task(conn, hdr->itt); 1193913e5bf4SMike Christie if (!task) 1194913e5bf4SMike Christie return ISCSI_ERR_BAD_ITT; 1195913e5bf4SMike Christie break; 1196913e5bf4SMike Christie default: 1197913e5bf4SMike Christie return ISCSI_ERR_BAD_OPCODE; 11983e5c28adSMike Christie } 1199913e5bf4SMike Christie 1200913e5bf4SMike Christie switch(opcode) { 1201913e5bf4SMike Christie case ISCSI_OP_SCSI_CMD_RSP: 12029c19a7d0SMike Christie iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen); 12033e5c28adSMike Christie break; 12043e5c28adSMike Christie case ISCSI_OP_SCSI_DATA_IN: 12051d9edf02SMike Christie iscsi_data_in_rsp(conn, hdr, task); 12063e5c28adSMike Christie break; 12073e5c28adSMike Christie case ISCSI_OP_LOGOUT_RSP: 12083e5c28adSMike Christie iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); 12093e5c28adSMike Christie if (datalen) { 12103e5c28adSMike Christie rc = ISCSI_ERR_PROTO; 12113e5c28adSMike Christie break; 12123e5c28adSMike Christie } 12133e5c28adSMike Christie conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; 12143e5c28adSMike Christie goto recv_pdu; 12153e5c28adSMike Christie case ISCSI_OP_LOGIN_RSP: 12163e5c28adSMike Christie case ISCSI_OP_TEXT_RSP: 12173e5c28adSMike Christie iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); 12183e5c28adSMike Christie /* 12193e5c28adSMike Christie * login related PDU's exp_statsn is handled in 12203e5c28adSMike Christie * userspace 12213e5c28adSMike Christie */ 12223e5c28adSMike Christie goto recv_pdu; 12233e5c28adSMike Christie case ISCSI_OP_SCSI_TMFUNC_RSP: 12243e5c28adSMike Christie iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); 12253e5c28adSMike Christie if (datalen) { 12263e5c28adSMike Christie rc = ISCSI_ERR_PROTO; 12273e5c28adSMike Christie break; 12283e5c28adSMike Christie } 12293e5c28adSMike Christie 12303e5c28adSMike Christie iscsi_tmf_rsp(conn, hdr); 1231b3cd5050SMike Christie iscsi_complete_task(task, ISCSI_TASK_COMPLETED); 12323e5c28adSMike Christie break; 12333e5c28adSMike Christie case ISCSI_OP_NOOP_IN: 12343e5c28adSMike Christie iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); 12353e5c28adSMike Christie if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) { 12363e5c28adSMike Christie rc = ISCSI_ERR_PROTO; 12373e5c28adSMike Christie break; 12383e5c28adSMike Christie } 12393e5c28adSMike Christie conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; 12403e5c28adSMike Christie 12418afa1439SMike Christie rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr, 12428afa1439SMike Christie data, datalen); 12433e5c28adSMike Christie break; 12443e5c28adSMike Christie default: 12453e5c28adSMike Christie rc = ISCSI_ERR_BAD_OPCODE; 12463e5c28adSMike Christie break; 12473e5c28adSMike Christie } 12483e5c28adSMike Christie 12493e5c28adSMike Christie out: 12503e5c28adSMike Christie return rc; 12513e5c28adSMike Christie recv_pdu: 12523e5c28adSMike Christie if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) 12533e5c28adSMike Christie rc = ISCSI_ERR_CONN_FAILED; 1254b3cd5050SMike Christie iscsi_complete_task(task, ISCSI_TASK_COMPLETED); 12557996a778SMike Christie return rc; 12567996a778SMike Christie } 1257913e5bf4SMike Christie EXPORT_SYMBOL_GPL(__iscsi_complete_pdu); 12587996a778SMike Christie 12597996a778SMike Christie int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 12607996a778SMike Christie char *data, int datalen) 12617996a778SMike Christie { 12627996a778SMike Christie int rc; 12637996a778SMike Christie 12647996a778SMike Christie spin_lock(&conn->session->lock); 12657996a778SMike Christie rc = __iscsi_complete_pdu(conn, hdr, data, datalen); 12667996a778SMike Christie spin_unlock(&conn->session->lock); 12677996a778SMike Christie return rc; 12687996a778SMike Christie } 12697996a778SMike Christie EXPORT_SYMBOL_GPL(iscsi_complete_pdu); 12707996a778SMike Christie 12710af967f5SMike Christie int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt) 12727996a778SMike Christie { 12737996a778SMike Christie struct iscsi_session *session = conn->session; 1274262ef636SMike Christie int age = 0, i = 0; 12757996a778SMike Christie 12760af967f5SMike Christie if (itt == RESERVED_ITT) 12770af967f5SMike Christie return 0; 12780af967f5SMike Christie 1279262ef636SMike Christie if (session->tt->parse_pdu_itt) 1280262ef636SMike Christie session->tt->parse_pdu_itt(conn, itt, &i, &age); 1281262ef636SMike Christie else { 1282262ef636SMike Christie i = get_itt(itt); 1283262ef636SMike Christie age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK; 1284262ef636SMike Christie } 1285262ef636SMike Christie 1286262ef636SMike Christie if (age != session->age) { 1287322d739dSMike Christie iscsi_conn_printk(KERN_ERR, conn, 12880af967f5SMike Christie "received itt %x expected session age (%x)\n", 1289913e5bf4SMike Christie (__force u32)itt, session->age); 12907996a778SMike Christie return ISCSI_ERR_BAD_ITT; 12917996a778SMike Christie } 12927996a778SMike Christie 12933e5c28adSMike Christie if (i >= session->cmds_max) { 12943e5c28adSMike Christie iscsi_conn_printk(KERN_ERR, conn, 12953e5c28adSMike Christie "received invalid itt index %u (max cmds " 12963e5c28adSMike Christie "%u.\n", i, session->cmds_max); 12973e5c28adSMike Christie return ISCSI_ERR_BAD_ITT; 12987996a778SMike Christie } 12997996a778SMike Christie return 0; 13007996a778SMike Christie } 13017996a778SMike Christie EXPORT_SYMBOL_GPL(iscsi_verify_itt); 13027996a778SMike Christie 1303913e5bf4SMike Christie /** 1304913e5bf4SMike Christie * iscsi_itt_to_ctask - look up ctask by itt 1305913e5bf4SMike Christie * @conn: iscsi connection 1306913e5bf4SMike Christie * @itt: itt 1307913e5bf4SMike Christie * 1308913e5bf4SMike Christie * This should be used for cmd tasks. 1309913e5bf4SMike Christie * 1310913e5bf4SMike Christie * The session lock must be held. 1311913e5bf4SMike Christie */ 1312913e5bf4SMike Christie struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt) 13130af967f5SMike Christie { 13149c19a7d0SMike Christie struct iscsi_task *task; 13150af967f5SMike Christie 13160af967f5SMike Christie if (iscsi_verify_itt(conn, itt)) 13170af967f5SMike Christie return NULL; 13180af967f5SMike Christie 1319913e5bf4SMike Christie task = iscsi_itt_to_task(conn, itt); 1320913e5bf4SMike Christie if (!task || !task->sc) 13210af967f5SMike Christie return NULL; 13220af967f5SMike Christie 1323913e5bf4SMike Christie if (task->sc->SCp.phase != conn->session->age) { 1324913e5bf4SMike Christie iscsi_session_printk(KERN_ERR, conn->session, 1325913e5bf4SMike Christie "task's session age %d, expected %d\n", 1326913e5bf4SMike Christie task->sc->SCp.phase, conn->session->age); 13270af967f5SMike Christie return NULL; 1328913e5bf4SMike Christie } 13290af967f5SMike Christie 13309c19a7d0SMike Christie return task; 13310af967f5SMike Christie } 13320af967f5SMike Christie EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask); 13330af967f5SMike Christie 133440a06e75SMike Christie void iscsi_session_failure(struct iscsi_session *session, 1335e5bd7b54SMike Christie enum iscsi_err err) 1336e5bd7b54SMike Christie { 1337e5bd7b54SMike Christie struct iscsi_conn *conn; 1338e5bd7b54SMike Christie struct device *dev; 1339e5bd7b54SMike Christie unsigned long flags; 1340e5bd7b54SMike Christie 1341e5bd7b54SMike Christie spin_lock_irqsave(&session->lock, flags); 1342e5bd7b54SMike Christie conn = session->leadconn; 1343e5bd7b54SMike Christie if (session->state == ISCSI_STATE_TERMINATE || !conn) { 1344e5bd7b54SMike Christie spin_unlock_irqrestore(&session->lock, flags); 1345e5bd7b54SMike Christie return; 1346e5bd7b54SMike Christie } 1347e5bd7b54SMike Christie 1348e5bd7b54SMike Christie dev = get_device(&conn->cls_conn->dev); 1349e5bd7b54SMike Christie spin_unlock_irqrestore(&session->lock, flags); 1350e5bd7b54SMike Christie if (!dev) 1351e5bd7b54SMike Christie return; 1352e5bd7b54SMike Christie /* 1353e5bd7b54SMike Christie * if the host is being removed bypass the connection 1354e5bd7b54SMike Christie * recovery initialization because we are going to kill 1355e5bd7b54SMike Christie * the session. 1356e5bd7b54SMike Christie */ 1357e5bd7b54SMike Christie if (err == ISCSI_ERR_INVALID_HOST) 1358e5bd7b54SMike Christie iscsi_conn_error_event(conn->cls_conn, err); 1359e5bd7b54SMike Christie else 1360e5bd7b54SMike Christie iscsi_conn_failure(conn, err); 1361e5bd7b54SMike Christie put_device(dev); 1362e5bd7b54SMike Christie } 1363e5bd7b54SMike Christie EXPORT_SYMBOL_GPL(iscsi_session_failure); 1364e5bd7b54SMike Christie 13657996a778SMike Christie void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) 13667996a778SMike Christie { 13677996a778SMike Christie struct iscsi_session *session = conn->session; 13687996a778SMike Christie unsigned long flags; 13697996a778SMike Christie 13707996a778SMike Christie spin_lock_irqsave(&session->lock, flags); 1371656cffc9SMike Christie if (session->state == ISCSI_STATE_FAILED) { 1372656cffc9SMike Christie spin_unlock_irqrestore(&session->lock, flags); 1373656cffc9SMike Christie return; 1374656cffc9SMike Christie } 1375656cffc9SMike Christie 137667a61114SMike Christie if (conn->stop_stage == 0) 13777996a778SMike Christie session->state = ISCSI_STATE_FAILED; 13787996a778SMike Christie spin_unlock_irqrestore(&session->lock, flags); 1379e5bd7b54SMike Christie 13807996a778SMike Christie set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); 13817996a778SMike Christie set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); 1382e5bd7b54SMike Christie iscsi_conn_error_event(conn->cls_conn, err); 13837996a778SMike Christie } 13847996a778SMike Christie EXPORT_SYMBOL_GPL(iscsi_conn_failure); 13857996a778SMike Christie 138677a23c21SMike Christie static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn) 138777a23c21SMike Christie { 138877a23c21SMike Christie struct iscsi_session *session = conn->session; 138977a23c21SMike Christie 139077a23c21SMike Christie /* 139177a23c21SMike Christie * Check for iSCSI window and take care of CmdSN wrap-around 139277a23c21SMike Christie */ 1393e0726407SMike Christie if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) { 13941b2c7af8SMike Christie ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn " 13951b2c7af8SMike Christie "%u MaxCmdSN %u CmdSN %u/%u\n", 13961b2c7af8SMike Christie session->exp_cmdsn, session->max_cmdsn, 13971b2c7af8SMike Christie session->cmdsn, session->queued_cmdsn); 139877a23c21SMike Christie return -ENOSPC; 139977a23c21SMike Christie } 140077a23c21SMike Christie return 0; 140177a23c21SMike Christie } 140277a23c21SMike Christie 14039c19a7d0SMike Christie static int iscsi_xmit_task(struct iscsi_conn *conn) 140477a23c21SMike Christie { 14059c19a7d0SMike Christie struct iscsi_task *task = conn->task; 1406843c0a8aSMike Christie int rc; 140777a23c21SMike Christie 140870b31c15SMike Christie if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) 140970b31c15SMike Christie return -ENODATA; 141070b31c15SMike Christie 14119c19a7d0SMike Christie __iscsi_get_task(task); 141277a23c21SMike Christie spin_unlock_bh(&conn->session->lock); 14139c19a7d0SMike Christie rc = conn->session->tt->xmit_task(task); 141477a23c21SMike Christie spin_lock_bh(&conn->session->lock); 1415d355e57dSMike Christie if (!rc) { 14169c19a7d0SMike Christie /* done with this task */ 1417d355e57dSMike Christie task->last_xfer = jiffies; 14189c19a7d0SMike Christie conn->task = NULL; 1419d355e57dSMike Christie } 1420d355e57dSMike Christie __iscsi_put_task(task); 142177a23c21SMike Christie return rc; 142277a23c21SMike Christie } 142377a23c21SMike Christie 14247996a778SMike Christie /** 14259c19a7d0SMike Christie * iscsi_requeue_task - requeue task to run from session workqueue 14269c19a7d0SMike Christie * @task: task to requeue 1427843c0a8aSMike Christie * 14289c19a7d0SMike Christie * LLDs that need to run a task from the session workqueue should call 1429052d0144SMike Christie * this. The session lock must be held. This should only be called 1430052d0144SMike Christie * by software drivers. 1431843c0a8aSMike Christie */ 14329c19a7d0SMike Christie void iscsi_requeue_task(struct iscsi_task *task) 1433843c0a8aSMike Christie { 14349c19a7d0SMike Christie struct iscsi_conn *conn = task->conn; 1435843c0a8aSMike Christie 14363bbaaad9SMike Christie /* 14373bbaaad9SMike Christie * this may be on the requeue list already if the xmit_task callout 14383bbaaad9SMike Christie * is handling the r2ts while we are adding new ones 14393bbaaad9SMike Christie */ 14403bbaaad9SMike Christie if (list_empty(&task->running)) 14413bbaaad9SMike Christie list_add_tail(&task->running, &conn->requeue); 144232ae763eSMike Christie iscsi_conn_queue_work(conn); 1443843c0a8aSMike Christie } 14449c19a7d0SMike Christie EXPORT_SYMBOL_GPL(iscsi_requeue_task); 1445843c0a8aSMike Christie 1446843c0a8aSMike Christie /** 14477996a778SMike Christie * iscsi_data_xmit - xmit any command into the scheduled connection 14487996a778SMike Christie * @conn: iscsi connection 14497996a778SMike Christie * 14507996a778SMike Christie * Notes: 14517996a778SMike Christie * The function can return -EAGAIN in which case the caller must 14527996a778SMike Christie * re-schedule it again later or recover. '0' return code means 14537996a778SMike Christie * successful xmit. 14547996a778SMike Christie **/ 14557996a778SMike Christie static int iscsi_data_xmit(struct iscsi_conn *conn) 14567996a778SMike Christie { 14575d12c05eSMike Christie struct iscsi_task *task; 14583219e529SMike Christie int rc = 0; 14597996a778SMike Christie 146077a23c21SMike Christie spin_lock_bh(&conn->session->lock); 146170b31c15SMike Christie if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) { 14621b2c7af8SMike Christie ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n"); 146377a23c21SMike Christie spin_unlock_bh(&conn->session->lock); 14643219e529SMike Christie return -ENODATA; 14657996a778SMike Christie } 14667996a778SMike Christie 14679c19a7d0SMike Christie if (conn->task) { 14689c19a7d0SMike Christie rc = iscsi_xmit_task(conn); 14693219e529SMike Christie if (rc) 147070b31c15SMike Christie goto done; 14717996a778SMike Christie } 147277a23c21SMike Christie 147377a23c21SMike Christie /* 147477a23c21SMike Christie * process mgmt pdus like nops before commands since we should 147577a23c21SMike Christie * only have one nop-out as a ping from us and targets should not 147677a23c21SMike Christie * overflow us with nop-ins 147777a23c21SMike Christie */ 147877a23c21SMike Christie check_mgmt: 1479843c0a8aSMike Christie while (!list_empty(&conn->mgmtqueue)) { 14809c19a7d0SMike Christie conn->task = list_entry(conn->mgmtqueue.next, 14819c19a7d0SMike Christie struct iscsi_task, running); 14823bbaaad9SMike Christie list_del_init(&conn->task->running); 14839c19a7d0SMike Christie if (iscsi_prep_mgmt_task(conn, conn->task)) { 14849c19a7d0SMike Christie __iscsi_put_task(conn->task); 14859c19a7d0SMike Christie conn->task = NULL; 1486b3a7ea8dSMike Christie continue; 1487b3a7ea8dSMike Christie } 14889c19a7d0SMike Christie rc = iscsi_xmit_task(conn); 14893219e529SMike Christie if (rc) 149070b31c15SMike Christie goto done; 14917996a778SMike Christie } 14927996a778SMike Christie 1493843c0a8aSMike Christie /* process pending command queue */ 14943bbaaad9SMike Christie while (!list_empty(&conn->cmdqueue)) { 14955d12c05eSMike Christie conn->task = list_entry(conn->cmdqueue.next, struct iscsi_task, 14965d12c05eSMike Christie running); 14973bbaaad9SMike Christie list_del_init(&conn->task->running); 1498b3a7ea8dSMike Christie if (conn->session->state == ISCSI_STATE_LOGGING_OUT) { 1499b3cd5050SMike Christie fail_scsi_task(conn->task, DID_IMM_RETRY); 1500b3a7ea8dSMike Christie continue; 1501b3a7ea8dSMike Christie } 1502577577daSMike Christie rc = iscsi_prep_scsi_cmd_pdu(conn->task); 1503577577daSMike Christie if (rc) { 15045d12c05eSMike Christie if (rc == -ENOMEM || rc == -EACCES) { 15053bbaaad9SMike Christie list_add_tail(&conn->task->running, 15063bbaaad9SMike Christie &conn->cmdqueue); 1507577577daSMike Christie conn->task = NULL; 150870b31c15SMike Christie goto done; 1509577577daSMike Christie } else 1510b3cd5050SMike Christie fail_scsi_task(conn->task, DID_ABORT); 1511004d6530SBoaz Harrosh continue; 1512004d6530SBoaz Harrosh } 15139c19a7d0SMike Christie rc = iscsi_xmit_task(conn); 15143219e529SMike Christie if (rc) 151570b31c15SMike Christie goto done; 151677a23c21SMike Christie /* 15179c19a7d0SMike Christie * we could continuously get new task requests so 151877a23c21SMike Christie * we need to check the mgmt queue for nops that need to 151977a23c21SMike Christie * be sent to aviod starvation 152077a23c21SMike Christie */ 1521843c0a8aSMike Christie if (!list_empty(&conn->mgmtqueue)) 1522843c0a8aSMike Christie goto check_mgmt; 1523843c0a8aSMike Christie } 1524843c0a8aSMike Christie 1525843c0a8aSMike Christie while (!list_empty(&conn->requeue)) { 1526b3a7ea8dSMike Christie /* 1527b3a7ea8dSMike Christie * we always do fastlogout - conn stop code will clean up. 1528b3a7ea8dSMike Christie */ 1529b3a7ea8dSMike Christie if (conn->session->state == ISCSI_STATE_LOGGING_OUT) 1530b3a7ea8dSMike Christie break; 1531b3a7ea8dSMike Christie 15325d12c05eSMike Christie task = list_entry(conn->requeue.next, struct iscsi_task, 15335d12c05eSMike Christie running); 15345d12c05eSMike Christie if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT)) 15355d12c05eSMike Christie break; 15365d12c05eSMike Christie 15375d12c05eSMike Christie conn->task = task; 15383bbaaad9SMike Christie list_del_init(&conn->task->running); 15399c19a7d0SMike Christie conn->task->state = ISCSI_TASK_RUNNING; 15409c19a7d0SMike Christie rc = iscsi_xmit_task(conn); 1541843c0a8aSMike Christie if (rc) 154270b31c15SMike Christie goto done; 1543843c0a8aSMike Christie if (!list_empty(&conn->mgmtqueue)) 154477a23c21SMike Christie goto check_mgmt; 15457996a778SMike Christie } 154677a23c21SMike Christie spin_unlock_bh(&conn->session->lock); 15473219e529SMike Christie return -ENODATA; 15487996a778SMike Christie 154970b31c15SMike Christie done: 155077a23c21SMike Christie spin_unlock_bh(&conn->session->lock); 15513219e529SMike Christie return rc; 15527996a778SMike Christie } 15537996a778SMike Christie 1554c4028958SDavid Howells static void iscsi_xmitworker(struct work_struct *work) 15557996a778SMike Christie { 1556c4028958SDavid Howells struct iscsi_conn *conn = 1557c4028958SDavid Howells container_of(work, struct iscsi_conn, xmitwork); 15583219e529SMike Christie int rc; 15597996a778SMike Christie /* 15607996a778SMike Christie * serialize Xmit worker on a per-connection basis. 15617996a778SMike Christie */ 15623219e529SMike Christie do { 15633219e529SMike Christie rc = iscsi_data_xmit(conn); 15643219e529SMike Christie } while (rc >= 0 || rc == -EAGAIN); 15657996a778SMike Christie } 15667996a778SMike Christie 1567577577daSMike Christie static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn, 1568577577daSMike Christie struct scsi_cmnd *sc) 1569577577daSMike Christie { 1570577577daSMike Christie struct iscsi_task *task; 1571577577daSMike Christie 15727acd72ebSStefani Seibold if (!kfifo_out(&conn->session->cmdpool.queue, 1573577577daSMike Christie (void *) &task, sizeof(void *))) 1574577577daSMike Christie return NULL; 1575577577daSMike Christie 1576577577daSMike Christie sc->SCp.phase = conn->session->age; 1577577577daSMike Christie sc->SCp.ptr = (char *) task; 1578577577daSMike Christie 1579577577daSMike Christie atomic_set(&task->refcount, 1); 1580577577daSMike Christie task->state = ISCSI_TASK_PENDING; 1581577577daSMike Christie task->conn = conn; 1582577577daSMike Christie task->sc = sc; 1583d355e57dSMike Christie task->have_checked_conn = false; 1584d355e57dSMike Christie task->last_timeout = jiffies; 1585d355e57dSMike Christie task->last_xfer = jiffies; 1586577577daSMike Christie INIT_LIST_HEAD(&task->running); 1587577577daSMike Christie return task; 1588577577daSMike Christie } 1589577577daSMike Christie 15907996a778SMike Christie enum { 15917996a778SMike Christie FAILURE_BAD_HOST = 1, 15927996a778SMike Christie FAILURE_SESSION_FAILED, 15937996a778SMike Christie FAILURE_SESSION_FREED, 15947996a778SMike Christie FAILURE_WINDOW_CLOSED, 159560ecebf5SMike Christie FAILURE_OOM, 15967996a778SMike Christie FAILURE_SESSION_TERMINATE, 1597656cffc9SMike Christie FAILURE_SESSION_IN_RECOVERY, 15987996a778SMike Christie FAILURE_SESSION_RECOVERY_TIMEOUT, 1599b3a7ea8dSMike Christie FAILURE_SESSION_LOGGING_OUT, 16006eabafbeSMike Christie FAILURE_SESSION_NOT_READY, 16017996a778SMike Christie }; 16027996a778SMike Christie 1603f281233dSJeff Garzik static int iscsi_queuecommand_lck(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *)) 16047996a778SMike Christie { 160575613521SMike Christie struct iscsi_cls_session *cls_session; 16067996a778SMike Christie struct Scsi_Host *host; 16071336aed1SMike Christie struct iscsi_host *ihost; 16087996a778SMike Christie int reason = 0; 16097996a778SMike Christie struct iscsi_session *session; 16107996a778SMike Christie struct iscsi_conn *conn; 16119c19a7d0SMike Christie struct iscsi_task *task = NULL; 16127996a778SMike Christie 16137996a778SMike Christie sc->scsi_done = done; 16147996a778SMike Christie sc->result = 0; 1615f47f2cf5SMike Christie sc->SCp.ptr = NULL; 16167996a778SMike Christie 16177996a778SMike Christie host = sc->device->host; 16181336aed1SMike Christie ihost = shost_priv(host); 16191040c99dSMike Christie spin_unlock(host->host_lock); 16207996a778SMike Christie 162175613521SMike Christie cls_session = starget_to_session(scsi_target(sc->device)); 162275613521SMike Christie session = cls_session->dd_data; 16237996a778SMike Christie spin_lock(&session->lock); 16247996a778SMike Christie 162575613521SMike Christie reason = iscsi_session_chkready(cls_session); 16266eabafbeSMike Christie if (reason) { 16276eabafbeSMike Christie sc->result = reason; 16286eabafbeSMike Christie goto fault; 16296eabafbeSMike Christie } 16306eabafbeSMike Christie 1631301e0f7eSMike Christie if (session->state != ISCSI_STATE_LOGGED_IN) { 1632656cffc9SMike Christie /* 1633656cffc9SMike Christie * to handle the race between when we set the recovery state 1634656cffc9SMike Christie * and block the session we requeue here (commands could 1635656cffc9SMike Christie * be entering our queuecommand while a block is starting 1636656cffc9SMike Christie * up because the block code is not locked) 1637656cffc9SMike Christie */ 16389000bcd6SMike Christie switch (session->state) { 1639301e0f7eSMike Christie case ISCSI_STATE_FAILED: 16409000bcd6SMike Christie case ISCSI_STATE_IN_RECOVERY: 1641656cffc9SMike Christie reason = FAILURE_SESSION_IN_RECOVERY; 1642301e0f7eSMike Christie sc->result = DID_IMM_RETRY << 16; 1643301e0f7eSMike Christie break; 16449000bcd6SMike Christie case ISCSI_STATE_LOGGING_OUT: 16459000bcd6SMike Christie reason = FAILURE_SESSION_LOGGING_OUT; 1646301e0f7eSMike Christie sc->result = DID_IMM_RETRY << 16; 1647301e0f7eSMike Christie break; 1648b3a7ea8dSMike Christie case ISCSI_STATE_RECOVERY_FAILED: 1649656cffc9SMike Christie reason = FAILURE_SESSION_RECOVERY_TIMEOUT; 165056d7fcfaSMike Christie sc->result = DID_TRANSPORT_FAILFAST << 16; 1651b3a7ea8dSMike Christie break; 1652b3a7ea8dSMike Christie case ISCSI_STATE_TERMINATE: 1653656cffc9SMike Christie reason = FAILURE_SESSION_TERMINATE; 16546eabafbeSMike Christie sc->result = DID_NO_CONNECT << 16; 1655b3a7ea8dSMike Christie break; 1656b3a7ea8dSMike Christie default: 16577996a778SMike Christie reason = FAILURE_SESSION_FREED; 16586eabafbeSMike Christie sc->result = DID_NO_CONNECT << 16; 1659b3a7ea8dSMike Christie } 16607996a778SMike Christie goto fault; 16617996a778SMike Christie } 16627996a778SMike Christie 16637996a778SMike Christie conn = session->leadconn; 166498644047SMike Christie if (!conn) { 166598644047SMike Christie reason = FAILURE_SESSION_FREED; 16666eabafbeSMike Christie sc->result = DID_NO_CONNECT << 16; 166798644047SMike Christie goto fault; 166898644047SMike Christie } 16697996a778SMike Christie 1670661134adSMike Christie if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) { 1671661134adSMike Christie reason = FAILURE_SESSION_IN_RECOVERY; 1672661134adSMike Christie sc->result = DID_REQUEUE; 1673661134adSMike Christie goto fault; 1674661134adSMike Christie } 1675661134adSMike Christie 167677a23c21SMike Christie if (iscsi_check_cmdsn_window_closed(conn)) { 167777a23c21SMike Christie reason = FAILURE_WINDOW_CLOSED; 167877a23c21SMike Christie goto reject; 167977a23c21SMike Christie } 168077a23c21SMike Christie 1681577577daSMike Christie task = iscsi_alloc_task(conn, sc); 1682577577daSMike Christie if (!task) { 168360ecebf5SMike Christie reason = FAILURE_OOM; 168460ecebf5SMike Christie goto reject; 168560ecebf5SMike Christie } 16867996a778SMike Christie 16871336aed1SMike Christie if (!ihost->workq) { 1688577577daSMike Christie reason = iscsi_prep_scsi_cmd_pdu(task); 1689577577daSMike Christie if (reason) { 16905d12c05eSMike Christie if (reason == -ENOMEM || reason == -EACCES) { 1691577577daSMike Christie reason = FAILURE_OOM; 1692577577daSMike Christie goto prepd_reject; 1693577577daSMike Christie } else { 1694052d0144SMike Christie sc->result = DID_ABORT << 16; 1695577577daSMike Christie goto prepd_fault; 1696577577daSMike Christie } 1697052d0144SMike Christie } 16989c19a7d0SMike Christie if (session->tt->xmit_task(task)) { 1699d3305f34SMike Christie session->cmdsn--; 1700052d0144SMike Christie reason = FAILURE_SESSION_NOT_READY; 1701577577daSMike Christie goto prepd_reject; 1702052d0144SMike Christie } 17033bbaaad9SMike Christie } else { 17043bbaaad9SMike Christie list_add_tail(&task->running, &conn->cmdqueue); 170532ae763eSMike Christie iscsi_conn_queue_work(conn); 17063bbaaad9SMike Christie } 1707052d0144SMike Christie 1708052d0144SMike Christie session->queued_cmdsn++; 1709052d0144SMike Christie spin_unlock(&session->lock); 17101040c99dSMike Christie spin_lock(host->host_lock); 17117996a778SMike Christie return 0; 17127996a778SMike Christie 1713577577daSMike Christie prepd_reject: 1714577577daSMike Christie sc->scsi_done = NULL; 1715b3cd5050SMike Christie iscsi_complete_task(task, ISCSI_TASK_COMPLETED); 17167996a778SMike Christie reject: 17177996a778SMike Christie spin_unlock(&session->lock); 17181b2c7af8SMike Christie ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n", 17191b2c7af8SMike Christie sc->cmnd[0], reason); 17201040c99dSMike Christie spin_lock(host->host_lock); 1721d6d13ee1SMike Christie return SCSI_MLQUEUE_TARGET_BUSY; 17227996a778SMike Christie 1723577577daSMike Christie prepd_fault: 1724577577daSMike Christie sc->scsi_done = NULL; 1725b3cd5050SMike Christie iscsi_complete_task(task, ISCSI_TASK_COMPLETED); 17267996a778SMike Christie fault: 17277996a778SMike Christie spin_unlock(&session->lock); 17281b2c7af8SMike Christie ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n", 17291b2c7af8SMike Christie sc->cmnd[0], reason); 1730c07d4444SBoaz Harrosh if (!scsi_bidi_cmnd(sc)) 17311c138991SFUJITA Tomonori scsi_set_resid(sc, scsi_bufflen(sc)); 1732c07d4444SBoaz Harrosh else { 1733c07d4444SBoaz Harrosh scsi_out(sc)->resid = scsi_out(sc)->length; 1734c07d4444SBoaz Harrosh scsi_in(sc)->resid = scsi_in(sc)->length; 1735c07d4444SBoaz Harrosh } 1736052d0144SMike Christie done(sc); 17371040c99dSMike Christie spin_lock(host->host_lock); 17387996a778SMike Christie return 0; 17397996a778SMike Christie } 1740f281233dSJeff Garzik 1741f281233dSJeff Garzik DEF_SCSI_QCMD(iscsi_queuecommand) 17427996a778SMike Christie EXPORT_SYMBOL_GPL(iscsi_queuecommand); 17437996a778SMike Christie 1744e881a172SMike Christie int iscsi_change_queue_depth(struct scsi_device *sdev, int depth, int reason) 17457996a778SMike Christie { 17461796e722SMike Christie switch (reason) { 17471796e722SMike Christie case SCSI_QDEPTH_DEFAULT: 17487996a778SMike Christie scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); 17491796e722SMike Christie break; 17501796e722SMike Christie case SCSI_QDEPTH_QFULL: 17511796e722SMike Christie scsi_track_queue_full(sdev, depth); 17521796e722SMike Christie break; 17531796e722SMike Christie case SCSI_QDEPTH_RAMP_UP: 17541796e722SMike Christie scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); 17551796e722SMike Christie break; 17561796e722SMike Christie default: 17571796e722SMike Christie return -EOPNOTSUPP; 17581796e722SMike Christie } 17597996a778SMike Christie return sdev->queue_depth; 17607996a778SMike Christie } 17617996a778SMike Christie EXPORT_SYMBOL_GPL(iscsi_change_queue_depth); 17627996a778SMike Christie 17636b5d6c44SMike Christie int iscsi_target_alloc(struct scsi_target *starget) 17646b5d6c44SMike Christie { 17656b5d6c44SMike Christie struct iscsi_cls_session *cls_session = starget_to_session(starget); 17666b5d6c44SMike Christie struct iscsi_session *session = cls_session->dd_data; 17676b5d6c44SMike Christie 17686b5d6c44SMike Christie starget->can_queue = session->scsi_cmds_max; 17696b5d6c44SMike Christie return 0; 17706b5d6c44SMike Christie } 17716b5d6c44SMike Christie EXPORT_SYMBOL_GPL(iscsi_target_alloc); 17726b5d6c44SMike Christie 1773843c0a8aSMike Christie static void iscsi_tmf_timedout(unsigned long data) 17747996a778SMike Christie { 1775843c0a8aSMike Christie struct iscsi_conn *conn = (struct iscsi_conn *)data; 17767996a778SMike Christie struct iscsi_session *session = conn->session; 17777996a778SMike Christie 17787996a778SMike Christie spin_lock(&session->lock); 1779843c0a8aSMike Christie if (conn->tmf_state == TMF_QUEUED) { 1780843c0a8aSMike Christie conn->tmf_state = TMF_TIMEDOUT; 1781bd2199d4SErez Zilber ISCSI_DBG_EH(session, "tmf timedout\n"); 17827996a778SMike Christie /* unblock eh_abort() */ 17837996a778SMike Christie wake_up(&conn->ehwait); 17847996a778SMike Christie } 17857996a778SMike Christie spin_unlock(&session->lock); 17867996a778SMike Christie } 17877996a778SMike Christie 17889c19a7d0SMike Christie static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn, 1789f6d5180cSMike Christie struct iscsi_tm *hdr, int age, 1790f6d5180cSMike Christie int timeout) 17917996a778SMike Christie { 17927996a778SMike Christie struct iscsi_session *session = conn->session; 17939c19a7d0SMike Christie struct iscsi_task *task; 17947996a778SMike Christie 17959c19a7d0SMike Christie task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr, 17967996a778SMike Christie NULL, 0); 17979c19a7d0SMike Christie if (!task) { 17986724add1SMike Christie spin_unlock_bh(&session->lock); 17997996a778SMike Christie iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); 1800843c0a8aSMike Christie spin_lock_bh(&session->lock); 1801bd2199d4SErez Zilber ISCSI_DBG_EH(session, "tmf exec failure\n"); 180277a23c21SMike Christie return -EPERM; 18037996a778SMike Christie } 18047996a778SMike Christie conn->tmfcmd_pdus_cnt++; 1805f6d5180cSMike Christie conn->tmf_timer.expires = timeout * HZ + jiffies; 1806843c0a8aSMike Christie conn->tmf_timer.function = iscsi_tmf_timedout; 1807843c0a8aSMike Christie conn->tmf_timer.data = (unsigned long)conn; 1808843c0a8aSMike Christie add_timer(&conn->tmf_timer); 1809bd2199d4SErez Zilber ISCSI_DBG_EH(session, "tmf set timeout\n"); 1810843c0a8aSMike Christie 18117996a778SMike Christie spin_unlock_bh(&session->lock); 18126724add1SMike Christie mutex_unlock(&session->eh_mutex); 18137996a778SMike Christie 18147996a778SMike Christie /* 18157996a778SMike Christie * block eh thread until: 18167996a778SMike Christie * 1817843c0a8aSMike Christie * 1) tmf response 1818843c0a8aSMike Christie * 2) tmf timeout 18197996a778SMike Christie * 3) session is terminated or restarted or userspace has 18207996a778SMike Christie * given up on recovery 18217996a778SMike Christie */ 1822843c0a8aSMike Christie wait_event_interruptible(conn->ehwait, age != session->age || 18237996a778SMike Christie session->state != ISCSI_STATE_LOGGED_IN || 1824843c0a8aSMike Christie conn->tmf_state != TMF_QUEUED); 18257996a778SMike Christie if (signal_pending(current)) 18267996a778SMike Christie flush_signals(current); 1827843c0a8aSMike Christie del_timer_sync(&conn->tmf_timer); 1828843c0a8aSMike Christie 18296724add1SMike Christie mutex_lock(&session->eh_mutex); 183077a23c21SMike Christie spin_lock_bh(&session->lock); 18319c19a7d0SMike Christie /* if the session drops it will clean up the task */ 1832843c0a8aSMike Christie if (age != session->age || 1833843c0a8aSMike Christie session->state != ISCSI_STATE_LOGGED_IN) 1834843c0a8aSMike Christie return -ENOTCONN; 18357996a778SMike Christie return 0; 18367996a778SMike Christie } 18377996a778SMike Christie 18387996a778SMike Christie /* 1839843c0a8aSMike Christie * Fail commands. session lock held and recv side suspended and xmit 1840843c0a8aSMike Christie * thread flushed 1841843c0a8aSMike Christie */ 18423bbaaad9SMike Christie static void fail_scsi_tasks(struct iscsi_conn *conn, unsigned lun, 18436eabafbeSMike Christie int error) 1844843c0a8aSMike Christie { 18453bbaaad9SMike Christie struct iscsi_task *task; 18463bbaaad9SMike Christie int i; 1847843c0a8aSMike Christie 18483bbaaad9SMike Christie for (i = 0; i < conn->session->cmds_max; i++) { 18493bbaaad9SMike Christie task = conn->session->cmds[i]; 18503bbaaad9SMike Christie if (!task->sc || task->state == ISCSI_TASK_FREE) 18513bbaaad9SMike Christie continue; 1852843c0a8aSMike Christie 18533bbaaad9SMike Christie if (lun != -1 && lun != task->sc->device->lun) 18543bbaaad9SMike Christie continue; 18553bbaaad9SMike Christie 18561b2c7af8SMike Christie ISCSI_DBG_SESSION(conn->session, 18573bbaaad9SMike Christie "failing sc %p itt 0x%x state %d\n", 18583bbaaad9SMike Christie task->sc, task->itt, task->state); 1859b3cd5050SMike Christie fail_scsi_task(task, error); 1860843c0a8aSMike Christie } 1861843c0a8aSMike Christie } 1862843c0a8aSMike Christie 1863661134adSMike Christie /** 1864661134adSMike Christie * iscsi_suspend_queue - suspend iscsi_queuecommand 1865661134adSMike Christie * @conn: iscsi conn to stop queueing IO on 1866661134adSMike Christie * 1867661134adSMike Christie * This grabs the session lock to make sure no one is in 1868661134adSMike Christie * xmit_task/queuecommand, and then sets suspend to prevent 1869661134adSMike Christie * new commands from being queued. This only needs to be called 1870661134adSMike Christie * by offload drivers that need to sync a path like ep disconnect 1871661134adSMike Christie * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi 1872661134adSMike Christie * will call iscsi_start_tx and iscsi_unblock_session when in FFP. 1873661134adSMike Christie */ 1874661134adSMike Christie void iscsi_suspend_queue(struct iscsi_conn *conn) 1875661134adSMike Christie { 1876661134adSMike Christie spin_lock_bh(&conn->session->lock); 1877661134adSMike Christie set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); 1878661134adSMike Christie spin_unlock_bh(&conn->session->lock); 1879661134adSMike Christie } 1880661134adSMike Christie EXPORT_SYMBOL_GPL(iscsi_suspend_queue); 1881661134adSMike Christie 1882661134adSMike Christie /** 1883661134adSMike Christie * iscsi_suspend_tx - suspend iscsi_data_xmit 1884661134adSMike Christie * @conn: iscsi conn tp stop processing IO on. 1885661134adSMike Christie * 1886661134adSMike Christie * This function sets the suspend bit to prevent iscsi_data_xmit 1887661134adSMike Christie * from sending new IO, and if work is queued on the xmit thread 1888661134adSMike Christie * it will wait for it to be completed. 1889661134adSMike Christie */ 1890b40977d9SMike Christie void iscsi_suspend_tx(struct iscsi_conn *conn) 18916724add1SMike Christie { 189232ae763eSMike Christie struct Scsi_Host *shost = conn->session->host; 189332ae763eSMike Christie struct iscsi_host *ihost = shost_priv(shost); 189432ae763eSMike Christie 18956724add1SMike Christie set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); 18961336aed1SMike Christie if (ihost->workq) 189732ae763eSMike Christie flush_workqueue(ihost->workq); 18986724add1SMike Christie } 1899b40977d9SMike Christie EXPORT_SYMBOL_GPL(iscsi_suspend_tx); 19006724add1SMike Christie 19016724add1SMike Christie static void iscsi_start_tx(struct iscsi_conn *conn) 19026724add1SMike Christie { 19036724add1SMike Christie clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); 190432ae763eSMike Christie iscsi_conn_queue_work(conn); 19056724add1SMike Christie } 19066724add1SMike Christie 19074c48a829SMike Christie /* 19084c48a829SMike Christie * We want to make sure a ping is in flight. It has timed out. 19094c48a829SMike Christie * And we are not busy processing a pdu that is making 19104c48a829SMike Christie * progress but got started before the ping and is taking a while 19114c48a829SMike Christie * to complete so the ping is just stuck behind it in a queue. 19124c48a829SMike Christie */ 19134c48a829SMike Christie static int iscsi_has_ping_timed_out(struct iscsi_conn *conn) 19144c48a829SMike Christie { 19154c48a829SMike Christie if (conn->ping_task && 19164c48a829SMike Christie time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) + 19174c48a829SMike Christie (conn->ping_timeout * HZ), jiffies)) 19184c48a829SMike Christie return 1; 19194c48a829SMike Christie else 19204c48a829SMike Christie return 0; 19214c48a829SMike Christie } 19224c48a829SMike Christie 1923d355e57dSMike Christie static enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc) 1924f6d5180cSMike Christie { 1925d355e57dSMike Christie enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED; 192692ed4d69SMike Christie struct iscsi_task *task = NULL, *running_task; 1927f6d5180cSMike Christie struct iscsi_cls_session *cls_session; 1928f6d5180cSMike Christie struct iscsi_session *session; 1929f6d5180cSMike Christie struct iscsi_conn *conn; 193092ed4d69SMike Christie int i; 1931f6d5180cSMike Christie 1932d355e57dSMike Christie cls_session = starget_to_session(scsi_target(sc->device)); 193375613521SMike Christie session = cls_session->dd_data; 1934f6d5180cSMike Christie 1935bd2199d4SErez Zilber ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc); 1936f6d5180cSMike Christie 1937f6d5180cSMike Christie spin_lock(&session->lock); 1938f6d5180cSMike Christie if (session->state != ISCSI_STATE_LOGGED_IN) { 1939f6d5180cSMike Christie /* 1940f6d5180cSMike Christie * We are probably in the middle of iscsi recovery so let 1941f6d5180cSMike Christie * that complete and handle the error. 1942f6d5180cSMike Christie */ 1943242f9dcbSJens Axboe rc = BLK_EH_RESET_TIMER; 1944f6d5180cSMike Christie goto done; 1945f6d5180cSMike Christie } 1946f6d5180cSMike Christie 1947f6d5180cSMike Christie conn = session->leadconn; 1948f6d5180cSMike Christie if (!conn) { 1949f6d5180cSMike Christie /* In the middle of shuting down */ 1950242f9dcbSJens Axboe rc = BLK_EH_RESET_TIMER; 1951f6d5180cSMike Christie goto done; 1952f6d5180cSMike Christie } 1953f6d5180cSMike Christie 1954d355e57dSMike Christie task = (struct iscsi_task *)sc->SCp.ptr; 195592ed4d69SMike Christie if (!task) { 195692ed4d69SMike Christie /* 195792ed4d69SMike Christie * Raced with completion. Just reset timer, and let it 195892ed4d69SMike Christie * complete normally 195992ed4d69SMike Christie */ 196092ed4d69SMike Christie rc = BLK_EH_RESET_TIMER; 1961d355e57dSMike Christie goto done; 196292ed4d69SMike Christie } 196392ed4d69SMike Christie 1964d355e57dSMike Christie /* 1965d355e57dSMike Christie * If we have sent (at least queued to the network layer) a pdu or 1966d355e57dSMike Christie * recvd one for the task since the last timeout ask for 1967d355e57dSMike Christie * more time. If on the next timeout we have not made progress 1968d355e57dSMike Christie * we can check if it is the task or connection when we send the 1969d355e57dSMike Christie * nop as a ping. 1970d355e57dSMike Christie */ 197192ed4d69SMike Christie if (time_after(task->last_xfer, task->last_timeout)) { 1972bd2199d4SErez Zilber ISCSI_DBG_EH(session, "Command making progress. Asking " 1973d355e57dSMike Christie "scsi-ml for more time to complete. " 197492ed4d69SMike Christie "Last data xfer at %lu. Last timeout was at " 1975d355e57dSMike Christie "%lu\n.", task->last_xfer, task->last_timeout); 1976d355e57dSMike Christie task->have_checked_conn = false; 1977d355e57dSMike Christie rc = BLK_EH_RESET_TIMER; 1978d355e57dSMike Christie goto done; 1979d355e57dSMike Christie } 1980d355e57dSMike Christie 1981f6d5180cSMike Christie if (!conn->recv_timeout && !conn->ping_timeout) 1982f6d5180cSMike Christie goto done; 1983f6d5180cSMike Christie /* 1984f6d5180cSMike Christie * if the ping timedout then we are in the middle of cleaning up 1985f6d5180cSMike Christie * and can let the iscsi eh handle it 1986f6d5180cSMike Christie */ 19874c48a829SMike Christie if (iscsi_has_ping_timed_out(conn)) { 1988242f9dcbSJens Axboe rc = BLK_EH_RESET_TIMER; 19894c48a829SMike Christie goto done; 19904c48a829SMike Christie } 1991d355e57dSMike Christie 199292ed4d69SMike Christie for (i = 0; i < conn->session->cmds_max; i++) { 199392ed4d69SMike Christie running_task = conn->session->cmds[i]; 199492ed4d69SMike Christie if (!running_task->sc || running_task == task || 199592ed4d69SMike Christie running_task->state != ISCSI_TASK_RUNNING) 199692ed4d69SMike Christie continue; 199792ed4d69SMike Christie 199892ed4d69SMike Christie /* 199992ed4d69SMike Christie * Only check if cmds started before this one have made 200092ed4d69SMike Christie * progress, or this could never fail 200192ed4d69SMike Christie */ 200292ed4d69SMike Christie if (time_after(running_task->sc->jiffies_at_alloc, 200392ed4d69SMike Christie task->sc->jiffies_at_alloc)) 200492ed4d69SMike Christie continue; 200592ed4d69SMike Christie 200692ed4d69SMike Christie if (time_after(running_task->last_xfer, task->last_timeout)) { 200792ed4d69SMike Christie /* 200892ed4d69SMike Christie * This task has not made progress, but a task 200992ed4d69SMike Christie * started before us has transferred data since 201092ed4d69SMike Christie * we started/last-checked. We could be queueing 201192ed4d69SMike Christie * too many tasks or the LU is bad. 201292ed4d69SMike Christie * 201392ed4d69SMike Christie * If the device is bad the cmds ahead of us on 201492ed4d69SMike Christie * other devs will complete, and this loop will 201592ed4d69SMike Christie * eventually fail starting the scsi eh. 201692ed4d69SMike Christie */ 201792ed4d69SMike Christie ISCSI_DBG_EH(session, "Command has not made progress " 201892ed4d69SMike Christie "but commands ahead of it have. " 201992ed4d69SMike Christie "Asking scsi-ml for more time to " 202092ed4d69SMike Christie "complete. Our last xfer vs running task " 202192ed4d69SMike Christie "last xfer %lu/%lu. Last check %lu.\n", 202292ed4d69SMike Christie task->last_xfer, running_task->last_xfer, 202392ed4d69SMike Christie task->last_timeout); 202492ed4d69SMike Christie rc = BLK_EH_RESET_TIMER; 202592ed4d69SMike Christie goto done; 202692ed4d69SMike Christie } 202792ed4d69SMike Christie } 202892ed4d69SMike Christie 2029d355e57dSMike Christie /* Assumes nop timeout is shorter than scsi cmd timeout */ 2030d355e57dSMike Christie if (task->have_checked_conn) 2031d355e57dSMike Christie goto done; 2032d355e57dSMike Christie 2033f6d5180cSMike Christie /* 2034d355e57dSMike Christie * Checking the transport already or nop from a cmd timeout still 2035d355e57dSMike Christie * running 2036f6d5180cSMike Christie */ 2037d355e57dSMike Christie if (conn->ping_task) { 2038d355e57dSMike Christie task->have_checked_conn = true; 2039242f9dcbSJens Axboe rc = BLK_EH_RESET_TIMER; 20404c48a829SMike Christie goto done; 20414c48a829SMike Christie } 20424c48a829SMike Christie 2043d355e57dSMike Christie /* Make sure there is a transport check done */ 2044d355e57dSMike Christie iscsi_send_nopout(conn, NULL); 2045d355e57dSMike Christie task->have_checked_conn = true; 2046242f9dcbSJens Axboe rc = BLK_EH_RESET_TIMER; 2047d355e57dSMike Christie 2048f6d5180cSMike Christie done: 2049d355e57dSMike Christie if (task) 2050d355e57dSMike Christie task->last_timeout = jiffies; 2051f6d5180cSMike Christie spin_unlock(&session->lock); 2052bd2199d4SErez Zilber ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ? 2053242f9dcbSJens Axboe "timer reset" : "nh"); 2054f6d5180cSMike Christie return rc; 2055f6d5180cSMike Christie } 2056f6d5180cSMike Christie 2057f6d5180cSMike Christie static void iscsi_check_transport_timeouts(unsigned long data) 2058f6d5180cSMike Christie { 2059f6d5180cSMike Christie struct iscsi_conn *conn = (struct iscsi_conn *)data; 2060f6d5180cSMike Christie struct iscsi_session *session = conn->session; 20614cf10435SMike Christie unsigned long recv_timeout, next_timeout = 0, last_recv; 2062f6d5180cSMike Christie 2063f6d5180cSMike Christie spin_lock(&session->lock); 2064f6d5180cSMike Christie if (session->state != ISCSI_STATE_LOGGED_IN) 2065f6d5180cSMike Christie goto done; 2066f6d5180cSMike Christie 20674cf10435SMike Christie recv_timeout = conn->recv_timeout; 20684cf10435SMike Christie if (!recv_timeout) 2069f6d5180cSMike Christie goto done; 2070f6d5180cSMike Christie 20714cf10435SMike Christie recv_timeout *= HZ; 2072f6d5180cSMike Christie last_recv = conn->last_recv; 20734c48a829SMike Christie 20744c48a829SMike Christie if (iscsi_has_ping_timed_out(conn)) { 2075322d739dSMike Christie iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs " 20764c48a829SMike Christie "expired, recv timeout %d, last rx %lu, " 20774c48a829SMike Christie "last ping %lu, now %lu\n", 20784c48a829SMike Christie conn->ping_timeout, conn->recv_timeout, 20794c48a829SMike Christie last_recv, conn->last_ping, jiffies); 2080f6d5180cSMike Christie spin_unlock(&session->lock); 2081f6d5180cSMike Christie iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); 2082f6d5180cSMike Christie return; 2083f6d5180cSMike Christie } 2084f6d5180cSMike Christie 20854cf10435SMike Christie if (time_before_eq(last_recv + recv_timeout, jiffies)) { 2086f6d5180cSMike Christie /* send a ping to try to provoke some traffic */ 20871b2c7af8SMike Christie ISCSI_DBG_CONN(conn, "Sending nopout as ping\n"); 2088f6d5180cSMike Christie iscsi_send_nopout(conn, NULL); 20894cf10435SMike Christie next_timeout = conn->last_ping + (conn->ping_timeout * HZ); 2090ad294e9cSMike Christie } else 20914cf10435SMike Christie next_timeout = last_recv + recv_timeout; 2092f6d5180cSMike Christie 20931b2c7af8SMike Christie ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout); 2094f6d5180cSMike Christie mod_timer(&conn->transport_timer, next_timeout); 2095f6d5180cSMike Christie done: 2096f6d5180cSMike Christie spin_unlock(&session->lock); 2097f6d5180cSMike Christie } 2098f6d5180cSMike Christie 20999c19a7d0SMike Christie static void iscsi_prep_abort_task_pdu(struct iscsi_task *task, 2100843c0a8aSMike Christie struct iscsi_tm *hdr) 2101843c0a8aSMike Christie { 2102843c0a8aSMike Christie memset(hdr, 0, sizeof(*hdr)); 2103843c0a8aSMike Christie hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; 2104843c0a8aSMike Christie hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK; 2105843c0a8aSMike Christie hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2106577577daSMike Christie memcpy(hdr->lun, task->lun, sizeof(hdr->lun)); 2107577577daSMike Christie hdr->rtt = task->hdr_itt; 2108577577daSMike Christie hdr->refcmdsn = task->cmdsn; 2109843c0a8aSMike Christie } 2110843c0a8aSMike Christie 21117996a778SMike Christie int iscsi_eh_abort(struct scsi_cmnd *sc) 21127996a778SMike Christie { 211375613521SMike Christie struct iscsi_cls_session *cls_session; 211475613521SMike Christie struct iscsi_session *session; 2115f47f2cf5SMike Christie struct iscsi_conn *conn; 21169c19a7d0SMike Christie struct iscsi_task *task; 2117843c0a8aSMike Christie struct iscsi_tm *hdr; 2118843c0a8aSMike Christie int rc, age; 21197996a778SMike Christie 212075613521SMike Christie cls_session = starget_to_session(scsi_target(sc->device)); 212175613521SMike Christie session = cls_session->dd_data; 212275613521SMike Christie 2123bd2199d4SErez Zilber ISCSI_DBG_EH(session, "aborting sc %p\n", sc); 21244421c9ebSMike Christie 21256724add1SMike Christie mutex_lock(&session->eh_mutex); 21266724add1SMike Christie spin_lock_bh(&session->lock); 2127f47f2cf5SMike Christie /* 2128f47f2cf5SMike Christie * if session was ISCSI_STATE_IN_RECOVERY then we may not have 2129f47f2cf5SMike Christie * got the command. 2130f47f2cf5SMike Christie */ 2131f47f2cf5SMike Christie if (!sc->SCp.ptr) { 2132bd2199d4SErez Zilber ISCSI_DBG_EH(session, "sc never reached iscsi layer or " 21331b2c7af8SMike Christie "it completed.\n"); 21346724add1SMike Christie spin_unlock_bh(&session->lock); 21356724add1SMike Christie mutex_unlock(&session->eh_mutex); 2136f47f2cf5SMike Christie return SUCCESS; 2137f47f2cf5SMike Christie } 2138f47f2cf5SMike Christie 21397996a778SMike Christie /* 21407996a778SMike Christie * If we are not logged in or we have started a new session 21417996a778SMike Christie * then let the host reset code handle this 21427996a778SMike Christie */ 2143843c0a8aSMike Christie if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN || 2144843c0a8aSMike Christie sc->SCp.phase != session->age) { 2145843c0a8aSMike Christie spin_unlock_bh(&session->lock); 2146843c0a8aSMike Christie mutex_unlock(&session->eh_mutex); 2147bd2199d4SErez Zilber ISCSI_DBG_EH(session, "failing abort due to dropped " 21484421c9ebSMike Christie "session.\n"); 2149843c0a8aSMike Christie return FAILED; 2150843c0a8aSMike Christie } 2151843c0a8aSMike Christie 2152843c0a8aSMike Christie conn = session->leadconn; 2153843c0a8aSMike Christie conn->eh_abort_cnt++; 2154843c0a8aSMike Christie age = session->age; 2155843c0a8aSMike Christie 21569c19a7d0SMike Christie task = (struct iscsi_task *)sc->SCp.ptr; 2157bd2199d4SErez Zilber ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n", 21581b2c7af8SMike Christie sc, task->itt); 21597996a778SMike Christie 21609c19a7d0SMike Christie /* task completed before time out */ 21619c19a7d0SMike Christie if (!task->sc) { 2162bd2199d4SErez Zilber ISCSI_DBG_EH(session, "sc completed while abort in progress\n"); 216377a23c21SMike Christie goto success; 21647ea8b828SMike Christie } 21657996a778SMike Christie 21669c19a7d0SMike Christie if (task->state == ISCSI_TASK_PENDING) { 2167b3cd5050SMike Christie fail_scsi_task(task, DID_ABORT); 216877a23c21SMike Christie goto success; 216977a23c21SMike Christie } 21707996a778SMike Christie 2171843c0a8aSMike Christie /* only have one tmf outstanding at a time */ 2172843c0a8aSMike Christie if (conn->tmf_state != TMF_INITIAL) 21737996a778SMike Christie goto failed; 2174843c0a8aSMike Christie conn->tmf_state = TMF_QUEUED; 21757996a778SMike Christie 2176843c0a8aSMike Christie hdr = &conn->tmhdr; 21779c19a7d0SMike Christie iscsi_prep_abort_task_pdu(task, hdr); 2178843c0a8aSMike Christie 21799c19a7d0SMike Christie if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) { 2180843c0a8aSMike Christie rc = FAILED; 2181843c0a8aSMike Christie goto failed; 2182843c0a8aSMike Christie } 2183843c0a8aSMike Christie 2184843c0a8aSMike Christie switch (conn->tmf_state) { 2185843c0a8aSMike Christie case TMF_SUCCESS: 21867ea8b828SMike Christie spin_unlock_bh(&session->lock); 2187913e5bf4SMike Christie /* 2188913e5bf4SMike Christie * stop tx side incase the target had sent a abort rsp but 2189913e5bf4SMike Christie * the initiator was still writing out data. 2190913e5bf4SMike Christie */ 21916724add1SMike Christie iscsi_suspend_tx(conn); 21927996a778SMike Christie /* 2193913e5bf4SMike Christie * we do not stop the recv side because targets have been 2194913e5bf4SMike Christie * good and have never sent us a successful tmf response 2195913e5bf4SMike Christie * then sent more data for the cmd. 21967996a778SMike Christie */ 21976187c242SMike Christie spin_lock_bh(&session->lock); 2198b3cd5050SMike Christie fail_scsi_task(task, DID_ABORT); 2199843c0a8aSMike Christie conn->tmf_state = TMF_INITIAL; 22005d12c05eSMike Christie memset(hdr, 0, sizeof(*hdr)); 22016187c242SMike Christie spin_unlock_bh(&session->lock); 22026724add1SMike Christie iscsi_start_tx(conn); 220377a23c21SMike Christie goto success_unlocked; 2204843c0a8aSMike Christie case TMF_TIMEDOUT: 2205843c0a8aSMike Christie spin_unlock_bh(&session->lock); 2206843c0a8aSMike Christie iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); 2207843c0a8aSMike Christie goto failed_unlocked; 2208843c0a8aSMike Christie case TMF_NOT_FOUND: 2209843c0a8aSMike Christie if (!sc->SCp.ptr) { 2210843c0a8aSMike Christie conn->tmf_state = TMF_INITIAL; 22115d12c05eSMike Christie memset(hdr, 0, sizeof(*hdr)); 22129c19a7d0SMike Christie /* task completed before tmf abort response */ 2213bd2199d4SErez Zilber ISCSI_DBG_EH(session, "sc completed while abort in " 2214bd2199d4SErez Zilber "progress\n"); 221577a23c21SMike Christie goto success; 221677a23c21SMike Christie } 221777a23c21SMike Christie /* fall through */ 221877a23c21SMike Christie default: 2219843c0a8aSMike Christie conn->tmf_state = TMF_INITIAL; 2220843c0a8aSMike Christie goto failed; 222177a23c21SMike Christie } 22227996a778SMike Christie 222377a23c21SMike Christie success: 222477a23c21SMike Christie spin_unlock_bh(&session->lock); 222577a23c21SMike Christie success_unlocked: 2226bd2199d4SErez Zilber ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n", 22271b2c7af8SMike Christie sc, task->itt); 22286724add1SMike Christie mutex_unlock(&session->eh_mutex); 22297996a778SMike Christie return SUCCESS; 22307996a778SMike Christie 22317996a778SMike Christie failed: 22327996a778SMike Christie spin_unlock_bh(&session->lock); 223377a23c21SMike Christie failed_unlocked: 2234bd2199d4SErez Zilber ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc, 22359c19a7d0SMike Christie task ? task->itt : 0); 22366724add1SMike Christie mutex_unlock(&session->eh_mutex); 22377996a778SMike Christie return FAILED; 22387996a778SMike Christie } 22397996a778SMike Christie EXPORT_SYMBOL_GPL(iscsi_eh_abort); 22407996a778SMike Christie 2241843c0a8aSMike Christie static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) 2242843c0a8aSMike Christie { 2243843c0a8aSMike Christie memset(hdr, 0, sizeof(*hdr)); 2244843c0a8aSMike Christie hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; 2245843c0a8aSMike Christie hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK; 2246843c0a8aSMike Christie hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2247843c0a8aSMike Christie int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun); 2248f6d5180cSMike Christie hdr->rtt = RESERVED_ITT; 2249843c0a8aSMike Christie } 2250843c0a8aSMike Christie 2251843c0a8aSMike Christie int iscsi_eh_device_reset(struct scsi_cmnd *sc) 2252843c0a8aSMike Christie { 225375613521SMike Christie struct iscsi_cls_session *cls_session; 225475613521SMike Christie struct iscsi_session *session; 2255843c0a8aSMike Christie struct iscsi_conn *conn; 2256843c0a8aSMike Christie struct iscsi_tm *hdr; 2257843c0a8aSMike Christie int rc = FAILED; 2258843c0a8aSMike Christie 225975613521SMike Christie cls_session = starget_to_session(scsi_target(sc->device)); 226075613521SMike Christie session = cls_session->dd_data; 226175613521SMike Christie 2262bd2199d4SErez Zilber ISCSI_DBG_EH(session, "LU Reset [sc %p lun %u]\n", sc, sc->device->lun); 2263843c0a8aSMike Christie 2264843c0a8aSMike Christie mutex_lock(&session->eh_mutex); 2265843c0a8aSMike Christie spin_lock_bh(&session->lock); 2266843c0a8aSMike Christie /* 2267843c0a8aSMike Christie * Just check if we are not logged in. We cannot check for 2268843c0a8aSMike Christie * the phase because the reset could come from a ioctl. 2269843c0a8aSMike Christie */ 2270843c0a8aSMike Christie if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) 2271843c0a8aSMike Christie goto unlock; 2272843c0a8aSMike Christie conn = session->leadconn; 2273843c0a8aSMike Christie 2274843c0a8aSMike Christie /* only have one tmf outstanding at a time */ 2275843c0a8aSMike Christie if (conn->tmf_state != TMF_INITIAL) 2276843c0a8aSMike Christie goto unlock; 2277843c0a8aSMike Christie conn->tmf_state = TMF_QUEUED; 2278843c0a8aSMike Christie 2279843c0a8aSMike Christie hdr = &conn->tmhdr; 2280843c0a8aSMike Christie iscsi_prep_lun_reset_pdu(sc, hdr); 2281843c0a8aSMike Christie 22829c19a7d0SMike Christie if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, 2283f6d5180cSMike Christie session->lu_reset_timeout)) { 2284843c0a8aSMike Christie rc = FAILED; 2285843c0a8aSMike Christie goto unlock; 2286843c0a8aSMike Christie } 2287843c0a8aSMike Christie 2288843c0a8aSMike Christie switch (conn->tmf_state) { 2289843c0a8aSMike Christie case TMF_SUCCESS: 2290843c0a8aSMike Christie break; 2291843c0a8aSMike Christie case TMF_TIMEDOUT: 2292843c0a8aSMike Christie spin_unlock_bh(&session->lock); 2293843c0a8aSMike Christie iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); 2294843c0a8aSMike Christie goto done; 2295843c0a8aSMike Christie default: 2296843c0a8aSMike Christie conn->tmf_state = TMF_INITIAL; 2297843c0a8aSMike Christie goto unlock; 2298843c0a8aSMike Christie } 2299843c0a8aSMike Christie 2300843c0a8aSMike Christie rc = SUCCESS; 2301843c0a8aSMike Christie spin_unlock_bh(&session->lock); 2302843c0a8aSMike Christie 2303843c0a8aSMike Christie iscsi_suspend_tx(conn); 2304913e5bf4SMike Christie 2305a3439148SMike Christie spin_lock_bh(&session->lock); 23065d12c05eSMike Christie memset(hdr, 0, sizeof(*hdr)); 23073bbaaad9SMike Christie fail_scsi_tasks(conn, sc->device->lun, DID_ERROR); 2308843c0a8aSMike Christie conn->tmf_state = TMF_INITIAL; 2309a3439148SMike Christie spin_unlock_bh(&session->lock); 2310843c0a8aSMike Christie 2311843c0a8aSMike Christie iscsi_start_tx(conn); 2312843c0a8aSMike Christie goto done; 2313843c0a8aSMike Christie 2314843c0a8aSMike Christie unlock: 2315843c0a8aSMike Christie spin_unlock_bh(&session->lock); 2316843c0a8aSMike Christie done: 2317bd2199d4SErez Zilber ISCSI_DBG_EH(session, "dev reset result = %s\n", 2318843c0a8aSMike Christie rc == SUCCESS ? "SUCCESS" : "FAILED"); 2319843c0a8aSMike Christie mutex_unlock(&session->eh_mutex); 2320843c0a8aSMike Christie return rc; 2321843c0a8aSMike Christie } 2322843c0a8aSMike Christie EXPORT_SYMBOL_GPL(iscsi_eh_device_reset); 2323843c0a8aSMike Christie 23243fe5ae8bSMike Christie void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session) 23253fe5ae8bSMike Christie { 23263fe5ae8bSMike Christie struct iscsi_session *session = cls_session->dd_data; 23273fe5ae8bSMike Christie 23283fe5ae8bSMike Christie spin_lock_bh(&session->lock); 23293fe5ae8bSMike Christie if (session->state != ISCSI_STATE_LOGGED_IN) { 23303fe5ae8bSMike Christie session->state = ISCSI_STATE_RECOVERY_FAILED; 23313fe5ae8bSMike Christie if (session->leadconn) 23323fe5ae8bSMike Christie wake_up(&session->leadconn->ehwait); 23333fe5ae8bSMike Christie } 23343fe5ae8bSMike Christie spin_unlock_bh(&session->lock); 23353fe5ae8bSMike Christie } 23363fe5ae8bSMike Christie EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout); 23373fe5ae8bSMike Christie 23383fe5ae8bSMike Christie /** 23393fe5ae8bSMike Christie * iscsi_eh_session_reset - drop session and attempt relogin 23403fe5ae8bSMike Christie * @sc: scsi command 23413fe5ae8bSMike Christie * 23423fe5ae8bSMike Christie * This function will wait for a relogin, session termination from 23433fe5ae8bSMike Christie * userspace, or a recovery/replacement timeout. 23443fe5ae8bSMike Christie */ 2345309ce156SJayamohan Kallickal int iscsi_eh_session_reset(struct scsi_cmnd *sc) 23463fe5ae8bSMike Christie { 23473fe5ae8bSMike Christie struct iscsi_cls_session *cls_session; 23483fe5ae8bSMike Christie struct iscsi_session *session; 23493fe5ae8bSMike Christie struct iscsi_conn *conn; 23503fe5ae8bSMike Christie 23513fe5ae8bSMike Christie cls_session = starget_to_session(scsi_target(sc->device)); 23523fe5ae8bSMike Christie session = cls_session->dd_data; 23533fe5ae8bSMike Christie conn = session->leadconn; 23543fe5ae8bSMike Christie 23553fe5ae8bSMike Christie mutex_lock(&session->eh_mutex); 23563fe5ae8bSMike Christie spin_lock_bh(&session->lock); 23573fe5ae8bSMike Christie if (session->state == ISCSI_STATE_TERMINATE) { 23583fe5ae8bSMike Christie failed: 23593fe5ae8bSMike Christie ISCSI_DBG_EH(session, 23603fe5ae8bSMike Christie "failing session reset: Could not log back into " 23613fe5ae8bSMike Christie "%s, %s [age %d]\n", session->targetname, 23623fe5ae8bSMike Christie conn->persistent_address, session->age); 23633fe5ae8bSMike Christie spin_unlock_bh(&session->lock); 23643fe5ae8bSMike Christie mutex_unlock(&session->eh_mutex); 23653fe5ae8bSMike Christie return FAILED; 23663fe5ae8bSMike Christie } 23673fe5ae8bSMike Christie 23683fe5ae8bSMike Christie spin_unlock_bh(&session->lock); 23693fe5ae8bSMike Christie mutex_unlock(&session->eh_mutex); 23703fe5ae8bSMike Christie /* 23713fe5ae8bSMike Christie * we drop the lock here but the leadconn cannot be destoyed while 23723fe5ae8bSMike Christie * we are in the scsi eh 23733fe5ae8bSMike Christie */ 23743fe5ae8bSMike Christie iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); 23753fe5ae8bSMike Christie 23763fe5ae8bSMike Christie ISCSI_DBG_EH(session, "wait for relogin\n"); 23773fe5ae8bSMike Christie wait_event_interruptible(conn->ehwait, 23783fe5ae8bSMike Christie session->state == ISCSI_STATE_TERMINATE || 23793fe5ae8bSMike Christie session->state == ISCSI_STATE_LOGGED_IN || 23803fe5ae8bSMike Christie session->state == ISCSI_STATE_RECOVERY_FAILED); 23813fe5ae8bSMike Christie if (signal_pending(current)) 23823fe5ae8bSMike Christie flush_signals(current); 23833fe5ae8bSMike Christie 23843fe5ae8bSMike Christie mutex_lock(&session->eh_mutex); 23853fe5ae8bSMike Christie spin_lock_bh(&session->lock); 23863fe5ae8bSMike Christie if (session->state == ISCSI_STATE_LOGGED_IN) { 23873fe5ae8bSMike Christie ISCSI_DBG_EH(session, 23883fe5ae8bSMike Christie "session reset succeeded for %s,%s\n", 23893fe5ae8bSMike Christie session->targetname, conn->persistent_address); 23903fe5ae8bSMike Christie } else 23913fe5ae8bSMike Christie goto failed; 23923fe5ae8bSMike Christie spin_unlock_bh(&session->lock); 23933fe5ae8bSMike Christie mutex_unlock(&session->eh_mutex); 23943fe5ae8bSMike Christie return SUCCESS; 23953fe5ae8bSMike Christie } 2396309ce156SJayamohan Kallickal EXPORT_SYMBOL_GPL(iscsi_eh_session_reset); 23973fe5ae8bSMike Christie 23983fe5ae8bSMike Christie static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) 23993fe5ae8bSMike Christie { 24003fe5ae8bSMike Christie memset(hdr, 0, sizeof(*hdr)); 24013fe5ae8bSMike Christie hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; 24023fe5ae8bSMike Christie hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK; 24033fe5ae8bSMike Christie hdr->flags |= ISCSI_FLAG_CMD_FINAL; 24043fe5ae8bSMike Christie hdr->rtt = RESERVED_ITT; 24053fe5ae8bSMike Christie } 24063fe5ae8bSMike Christie 24073fe5ae8bSMike Christie /** 24083fe5ae8bSMike Christie * iscsi_eh_target_reset - reset target 24093fe5ae8bSMike Christie * @sc: scsi command 24103fe5ae8bSMike Christie * 2411309ce156SJayamohan Kallickal * This will attempt to send a warm target reset. 24123fe5ae8bSMike Christie */ 24133fe5ae8bSMike Christie int iscsi_eh_target_reset(struct scsi_cmnd *sc) 24143fe5ae8bSMike Christie { 24153fe5ae8bSMike Christie struct iscsi_cls_session *cls_session; 24163fe5ae8bSMike Christie struct iscsi_session *session; 24173fe5ae8bSMike Christie struct iscsi_conn *conn; 24183fe5ae8bSMike Christie struct iscsi_tm *hdr; 24193fe5ae8bSMike Christie int rc = FAILED; 24203fe5ae8bSMike Christie 24213fe5ae8bSMike Christie cls_session = starget_to_session(scsi_target(sc->device)); 24223fe5ae8bSMike Christie session = cls_session->dd_data; 24233fe5ae8bSMike Christie 24243fe5ae8bSMike Christie ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc, 24253fe5ae8bSMike Christie session->targetname); 24263fe5ae8bSMike Christie 24273fe5ae8bSMike Christie mutex_lock(&session->eh_mutex); 24283fe5ae8bSMike Christie spin_lock_bh(&session->lock); 24293fe5ae8bSMike Christie /* 24303fe5ae8bSMike Christie * Just check if we are not logged in. We cannot check for 24313fe5ae8bSMike Christie * the phase because the reset could come from a ioctl. 24323fe5ae8bSMike Christie */ 24333fe5ae8bSMike Christie if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) 24343fe5ae8bSMike Christie goto unlock; 24353fe5ae8bSMike Christie conn = session->leadconn; 24363fe5ae8bSMike Christie 24373fe5ae8bSMike Christie /* only have one tmf outstanding at a time */ 24383fe5ae8bSMike Christie if (conn->tmf_state != TMF_INITIAL) 24393fe5ae8bSMike Christie goto unlock; 24403fe5ae8bSMike Christie conn->tmf_state = TMF_QUEUED; 24413fe5ae8bSMike Christie 24423fe5ae8bSMike Christie hdr = &conn->tmhdr; 24433fe5ae8bSMike Christie iscsi_prep_tgt_reset_pdu(sc, hdr); 24443fe5ae8bSMike Christie 24453fe5ae8bSMike Christie if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, 24463fe5ae8bSMike Christie session->tgt_reset_timeout)) { 24473fe5ae8bSMike Christie rc = FAILED; 24483fe5ae8bSMike Christie goto unlock; 24493fe5ae8bSMike Christie } 24503fe5ae8bSMike Christie 24513fe5ae8bSMike Christie switch (conn->tmf_state) { 24523fe5ae8bSMike Christie case TMF_SUCCESS: 24533fe5ae8bSMike Christie break; 24543fe5ae8bSMike Christie case TMF_TIMEDOUT: 24553fe5ae8bSMike Christie spin_unlock_bh(&session->lock); 24563fe5ae8bSMike Christie iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); 24573fe5ae8bSMike Christie goto done; 24583fe5ae8bSMike Christie default: 24593fe5ae8bSMike Christie conn->tmf_state = TMF_INITIAL; 24603fe5ae8bSMike Christie goto unlock; 24613fe5ae8bSMike Christie } 24623fe5ae8bSMike Christie 24633fe5ae8bSMike Christie rc = SUCCESS; 24643fe5ae8bSMike Christie spin_unlock_bh(&session->lock); 24653fe5ae8bSMike Christie 24663fe5ae8bSMike Christie iscsi_suspend_tx(conn); 24673fe5ae8bSMike Christie 24683fe5ae8bSMike Christie spin_lock_bh(&session->lock); 24693fe5ae8bSMike Christie memset(hdr, 0, sizeof(*hdr)); 24703fe5ae8bSMike Christie fail_scsi_tasks(conn, -1, DID_ERROR); 24713fe5ae8bSMike Christie conn->tmf_state = TMF_INITIAL; 24723fe5ae8bSMike Christie spin_unlock_bh(&session->lock); 24733fe5ae8bSMike Christie 24743fe5ae8bSMike Christie iscsi_start_tx(conn); 24753fe5ae8bSMike Christie goto done; 24763fe5ae8bSMike Christie 24773fe5ae8bSMike Christie unlock: 24783fe5ae8bSMike Christie spin_unlock_bh(&session->lock); 24793fe5ae8bSMike Christie done: 24803fe5ae8bSMike Christie ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname, 24813fe5ae8bSMike Christie rc == SUCCESS ? "SUCCESS" : "FAILED"); 24823fe5ae8bSMike Christie mutex_unlock(&session->eh_mutex); 2483309ce156SJayamohan Kallickal return rc; 2484309ce156SJayamohan Kallickal } 2485309ce156SJayamohan Kallickal EXPORT_SYMBOL_GPL(iscsi_eh_target_reset); 24863fe5ae8bSMike Christie 2487309ce156SJayamohan Kallickal /** 2488309ce156SJayamohan Kallickal * iscsi_eh_recover_target - reset target and possibly the session 2489309ce156SJayamohan Kallickal * @sc: scsi command 2490309ce156SJayamohan Kallickal * 2491309ce156SJayamohan Kallickal * This will attempt to send a warm target reset. If that fails, 2492309ce156SJayamohan Kallickal * we will escalate to ERL0 session recovery. 2493309ce156SJayamohan Kallickal */ 2494309ce156SJayamohan Kallickal int iscsi_eh_recover_target(struct scsi_cmnd *sc) 2495309ce156SJayamohan Kallickal { 2496309ce156SJayamohan Kallickal int rc; 2497309ce156SJayamohan Kallickal 2498309ce156SJayamohan Kallickal rc = iscsi_eh_target_reset(sc); 24993fe5ae8bSMike Christie if (rc == FAILED) 25003fe5ae8bSMike Christie rc = iscsi_eh_session_reset(sc); 25013fe5ae8bSMike Christie return rc; 25023fe5ae8bSMike Christie } 2503309ce156SJayamohan Kallickal EXPORT_SYMBOL_GPL(iscsi_eh_recover_target); 25043fe5ae8bSMike Christie 25056320377fSOlaf Kirch /* 25066320377fSOlaf Kirch * Pre-allocate a pool of @max items of @item_size. By default, the pool 25076320377fSOlaf Kirch * should be accessed via kfifo_{get,put} on q->queue. 25086320377fSOlaf Kirch * Optionally, the caller can obtain the array of object pointers 25096320377fSOlaf Kirch * by passing in a non-NULL @items pointer 25106320377fSOlaf Kirch */ 25117996a778SMike Christie int 25126320377fSOlaf Kirch iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size) 25137996a778SMike Christie { 25146320377fSOlaf Kirch int i, num_arrays = 1; 25157996a778SMike Christie 25166320377fSOlaf Kirch memset(q, 0, sizeof(*q)); 25177996a778SMike Christie 25187996a778SMike Christie q->max = max; 25196320377fSOlaf Kirch 25206320377fSOlaf Kirch /* If the user passed an items pointer, he wants a copy of 25216320377fSOlaf Kirch * the array. */ 25226320377fSOlaf Kirch if (items) 25236320377fSOlaf Kirch num_arrays++; 25246320377fSOlaf Kirch q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL); 25256320377fSOlaf Kirch if (q->pool == NULL) 2526f474a37bSJean Delvare return -ENOMEM; 25277996a778SMike Christie 2528c1e13f25SStefani Seibold kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*)); 25297996a778SMike Christie 25307996a778SMike Christie for (i = 0; i < max; i++) { 25316320377fSOlaf Kirch q->pool[i] = kzalloc(item_size, GFP_KERNEL); 25327996a778SMike Christie if (q->pool[i] == NULL) { 25336320377fSOlaf Kirch q->max = i; 25346320377fSOlaf Kirch goto enomem; 25357996a778SMike Christie } 25367acd72ebSStefani Seibold kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*)); 25377996a778SMike Christie } 25386320377fSOlaf Kirch 25396320377fSOlaf Kirch if (items) { 25406320377fSOlaf Kirch *items = q->pool + max; 25416320377fSOlaf Kirch memcpy(*items, q->pool, max * sizeof(void *)); 25426320377fSOlaf Kirch } 25436320377fSOlaf Kirch 25447996a778SMike Christie return 0; 25456320377fSOlaf Kirch 25466320377fSOlaf Kirch enomem: 25476320377fSOlaf Kirch iscsi_pool_free(q); 25486320377fSOlaf Kirch return -ENOMEM; 25497996a778SMike Christie } 25507996a778SMike Christie EXPORT_SYMBOL_GPL(iscsi_pool_init); 25517996a778SMike Christie 25526320377fSOlaf Kirch void iscsi_pool_free(struct iscsi_pool *q) 25537996a778SMike Christie { 25547996a778SMike Christie int i; 25557996a778SMike Christie 25567996a778SMike Christie for (i = 0; i < q->max; i++) 25576320377fSOlaf Kirch kfree(q->pool[i]); 25587996a778SMike Christie kfree(q->pool); 25597996a778SMike Christie } 25607996a778SMike Christie EXPORT_SYMBOL_GPL(iscsi_pool_free); 25617996a778SMike Christie 2562a4804cd6SMike Christie /** 2563a4804cd6SMike Christie * iscsi_host_add - add host to system 2564a4804cd6SMike Christie * @shost: scsi host 2565a4804cd6SMike Christie * @pdev: parent device 2566a4804cd6SMike Christie * 2567a4804cd6SMike Christie * This should be called by partial offload and software iscsi drivers 2568a4804cd6SMike Christie * to add a host to the system. 2569a4804cd6SMike Christie */ 2570a4804cd6SMike Christie int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev) 25717996a778SMike Christie { 25728e9a20ceSMike Christie if (!shost->can_queue) 25738e9a20ceSMike Christie shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX; 25748e9a20ceSMike Christie 25754d108350SMike Christie if (!shost->cmd_per_lun) 25764d108350SMike Christie shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN; 25774d108350SMike Christie 2578308cec14SMike Christie if (!shost->transportt->eh_timed_out) 2579308cec14SMike Christie shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out; 2580a4804cd6SMike Christie return scsi_add_host(shost, pdev); 2581a4804cd6SMike Christie } 2582a4804cd6SMike Christie EXPORT_SYMBOL_GPL(iscsi_host_add); 2583a4804cd6SMike Christie 2584a4804cd6SMike Christie /** 2585a4804cd6SMike Christie * iscsi_host_alloc - allocate a host and driver data 2586a4804cd6SMike Christie * @sht: scsi host template 2587a4804cd6SMike Christie * @dd_data_size: driver host data size 258832ae763eSMike Christie * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue 2589a4804cd6SMike Christie * 2590a4804cd6SMike Christie * This should be called by partial offload and software iscsi drivers. 2591a4804cd6SMike Christie * To access the driver specific memory use the iscsi_host_priv() macro. 2592a4804cd6SMike Christie */ 2593a4804cd6SMike Christie struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht, 25944d108350SMike Christie int dd_data_size, bool xmit_can_sleep) 2595a4804cd6SMike Christie { 2596a4804cd6SMike Christie struct Scsi_Host *shost; 2597e5bd7b54SMike Christie struct iscsi_host *ihost; 2598a4804cd6SMike Christie 2599a4804cd6SMike Christie shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size); 2600a4804cd6SMike Christie if (!shost) 2601a4804cd6SMike Christie return NULL; 2602e5bd7b54SMike Christie ihost = shost_priv(shost); 260332ae763eSMike Christie 260432ae763eSMike Christie if (xmit_can_sleep) { 260532ae763eSMike Christie snprintf(ihost->workq_name, sizeof(ihost->workq_name), 260632ae763eSMike Christie "iscsi_q_%d", shost->host_no); 260732ae763eSMike Christie ihost->workq = create_singlethread_workqueue(ihost->workq_name); 260832ae763eSMike Christie if (!ihost->workq) 260932ae763eSMike Christie goto free_host; 261032ae763eSMike Christie } 261132ae763eSMike Christie 2612e5bd7b54SMike Christie spin_lock_init(&ihost->lock); 2613e5bd7b54SMike Christie ihost->state = ISCSI_HOST_SETUP; 2614e5bd7b54SMike Christie ihost->num_sessions = 0; 2615e5bd7b54SMike Christie init_waitqueue_head(&ihost->session_removal_wq); 2616a4804cd6SMike Christie return shost; 261732ae763eSMike Christie 261832ae763eSMike Christie free_host: 261932ae763eSMike Christie scsi_host_put(shost); 262032ae763eSMike Christie return NULL; 262175613521SMike Christie } 2622a4804cd6SMike Christie EXPORT_SYMBOL_GPL(iscsi_host_alloc); 262375613521SMike Christie 2624e5bd7b54SMike Christie static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session) 2625e5bd7b54SMike Christie { 262640a06e75SMike Christie iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST); 2627e5bd7b54SMike Christie } 2628e5bd7b54SMike Christie 2629a4804cd6SMike Christie /** 2630a4804cd6SMike Christie * iscsi_host_remove - remove host and sessions 2631a4804cd6SMike Christie * @shost: scsi host 2632a4804cd6SMike Christie * 2633e5bd7b54SMike Christie * If there are any sessions left, this will initiate the removal and wait 2634e5bd7b54SMike Christie * for the completion. 2635a4804cd6SMike Christie */ 2636a4804cd6SMike Christie void iscsi_host_remove(struct Scsi_Host *shost) 2637a4804cd6SMike Christie { 2638e5bd7b54SMike Christie struct iscsi_host *ihost = shost_priv(shost); 2639e5bd7b54SMike Christie unsigned long flags; 2640e5bd7b54SMike Christie 2641e5bd7b54SMike Christie spin_lock_irqsave(&ihost->lock, flags); 2642e5bd7b54SMike Christie ihost->state = ISCSI_HOST_REMOVED; 2643e5bd7b54SMike Christie spin_unlock_irqrestore(&ihost->lock, flags); 2644e5bd7b54SMike Christie 2645e5bd7b54SMike Christie iscsi_host_for_each_session(shost, iscsi_notify_host_removed); 2646e5bd7b54SMike Christie wait_event_interruptible(ihost->session_removal_wq, 2647e5bd7b54SMike Christie ihost->num_sessions == 0); 2648e5bd7b54SMike Christie if (signal_pending(current)) 2649e5bd7b54SMike Christie flush_signals(current); 2650e5bd7b54SMike Christie 2651a4804cd6SMike Christie scsi_remove_host(shost); 265232ae763eSMike Christie if (ihost->workq) 265332ae763eSMike Christie destroy_workqueue(ihost->workq); 2654a4804cd6SMike Christie } 2655a4804cd6SMike Christie EXPORT_SYMBOL_GPL(iscsi_host_remove); 2656a4804cd6SMike Christie 2657a4804cd6SMike Christie void iscsi_host_free(struct Scsi_Host *shost) 265875613521SMike Christie { 265975613521SMike Christie struct iscsi_host *ihost = shost_priv(shost); 266075613521SMike Christie 266175613521SMike Christie kfree(ihost->netdev); 266275613521SMike Christie kfree(ihost->hwaddress); 266375613521SMike Christie kfree(ihost->initiatorname); 2664a4804cd6SMike Christie scsi_host_put(shost); 266575613521SMike Christie } 2666a4804cd6SMike Christie EXPORT_SYMBOL_GPL(iscsi_host_free); 266775613521SMike Christie 2668e5bd7b54SMike Christie static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost) 2669e5bd7b54SMike Christie { 2670e5bd7b54SMike Christie struct iscsi_host *ihost = shost_priv(shost); 2671e5bd7b54SMike Christie unsigned long flags; 2672e5bd7b54SMike Christie 2673e5bd7b54SMike Christie shost = scsi_host_get(shost); 2674e5bd7b54SMike Christie if (!shost) { 2675e5bd7b54SMike Christie printk(KERN_ERR "Invalid state. Cannot notify host removal " 2676e5bd7b54SMike Christie "of session teardown event because host already " 2677e5bd7b54SMike Christie "removed.\n"); 2678e5bd7b54SMike Christie return; 2679e5bd7b54SMike Christie } 2680e5bd7b54SMike Christie 2681e5bd7b54SMike Christie spin_lock_irqsave(&ihost->lock, flags); 2682e5bd7b54SMike Christie ihost->num_sessions--; 2683e5bd7b54SMike Christie if (ihost->num_sessions == 0) 2684e5bd7b54SMike Christie wake_up(&ihost->session_removal_wq); 2685e5bd7b54SMike Christie spin_unlock_irqrestore(&ihost->lock, flags); 2686e5bd7b54SMike Christie scsi_host_put(shost); 2687e5bd7b54SMike Christie } 2688e5bd7b54SMike Christie 268975613521SMike Christie /** 269075613521SMike Christie * iscsi_session_setup - create iscsi cls session and host and session 269175613521SMike Christie * @iscsit: iscsi transport template 269275613521SMike Christie * @shost: scsi host 269375613521SMike Christie * @cmds_max: session can queue 26949c19a7d0SMike Christie * @cmd_task_size: LLD task private data size 269575613521SMike Christie * @initial_cmdsn: initial CmdSN 269675613521SMike Christie * 269775613521SMike Christie * This can be used by software iscsi_transports that allocate 269875613521SMike Christie * a session per scsi host. 26993cf7b233SMike Christie * 27003cf7b233SMike Christie * Callers should set cmds_max to the largest total numer (mgmt + scsi) of 27013cf7b233SMike Christie * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks 27023cf7b233SMike Christie * for nop handling and login/logout requests. 270375613521SMike Christie */ 270475613521SMike Christie struct iscsi_cls_session * 270575613521SMike Christie iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost, 2706b8b9e1b8SJayamohan Kallickal uint16_t cmds_max, int dd_size, int cmd_task_size, 27077970634bSMike Christie uint32_t initial_cmdsn, unsigned int id) 270875613521SMike Christie { 2709e5bd7b54SMike Christie struct iscsi_host *ihost = shost_priv(shost); 271075613521SMike Christie struct iscsi_session *session; 271175613521SMike Christie struct iscsi_cls_session *cls_session; 27123cf7b233SMike Christie int cmd_i, scsi_cmds, total_cmds = cmds_max; 2713e5bd7b54SMike Christie unsigned long flags; 2714e5bd7b54SMike Christie 2715e5bd7b54SMike Christie spin_lock_irqsave(&ihost->lock, flags); 2716e5bd7b54SMike Christie if (ihost->state == ISCSI_HOST_REMOVED) { 2717e5bd7b54SMike Christie spin_unlock_irqrestore(&ihost->lock, flags); 2718e5bd7b54SMike Christie return NULL; 2719e5bd7b54SMike Christie } 2720e5bd7b54SMike Christie ihost->num_sessions++; 2721e5bd7b54SMike Christie spin_unlock_irqrestore(&ihost->lock, flags); 27228e9a20ceSMike Christie 27238e9a20ceSMike Christie if (!total_cmds) 27248e9a20ceSMike Christie total_cmds = ISCSI_DEF_XMIT_CMDS_MAX; 27253e5c28adSMike Christie /* 27263cf7b233SMike Christie * The iscsi layer needs some tasks for nop handling and tmfs, 27273cf7b233SMike Christie * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX 27283cf7b233SMike Christie * + 1 command for scsi IO. 27293e5c28adSMike Christie */ 27303cf7b233SMike Christie if (total_cmds < ISCSI_TOTAL_CMDS_MIN) { 27313cf7b233SMike Christie printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " 27323cf7b233SMike Christie "must be a power of two that is at least %d.\n", 27333cf7b233SMike Christie total_cmds, ISCSI_TOTAL_CMDS_MIN); 2734e5bd7b54SMike Christie goto dec_session_count; 27351548271eSMike Christie } 27363cf7b233SMike Christie 27373cf7b233SMike Christie if (total_cmds > ISCSI_TOTAL_CMDS_MAX) { 27383cf7b233SMike Christie printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " 27393cf7b233SMike Christie "must be a power of 2 less than or equal to %d.\n", 27403cf7b233SMike Christie cmds_max, ISCSI_TOTAL_CMDS_MAX); 27413cf7b233SMike Christie total_cmds = ISCSI_TOTAL_CMDS_MAX; 27423cf7b233SMike Christie } 27433cf7b233SMike Christie 27443cf7b233SMike Christie if (!is_power_of_2(total_cmds)) { 27453cf7b233SMike Christie printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " 27463cf7b233SMike Christie "must be a power of 2.\n", total_cmds); 27473cf7b233SMike Christie total_cmds = rounddown_pow_of_two(total_cmds); 27483cf7b233SMike Christie if (total_cmds < ISCSI_TOTAL_CMDS_MIN) 27493cf7b233SMike Christie return NULL; 27503cf7b233SMike Christie printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n", 27513cf7b233SMike Christie total_cmds); 27523cf7b233SMike Christie } 27533cf7b233SMike Christie scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX; 27541548271eSMike Christie 27555d91e209SMike Christie cls_session = iscsi_alloc_session(shost, iscsit, 2756b8b9e1b8SJayamohan Kallickal sizeof(struct iscsi_session) + 2757b8b9e1b8SJayamohan Kallickal dd_size); 275875613521SMike Christie if (!cls_session) 2759e5bd7b54SMike Christie goto dec_session_count; 276075613521SMike Christie session = cls_session->dd_data; 276175613521SMike Christie session->cls_session = cls_session; 27627996a778SMike Christie session->host = shost; 27637996a778SMike Christie session->state = ISCSI_STATE_FREE; 2764f6d5180cSMike Christie session->fast_abort = 1; 27653fe5ae8bSMike Christie session->tgt_reset_timeout = 30; 27664cd49ea1SMike Christie session->lu_reset_timeout = 15; 27674cd49ea1SMike Christie session->abort_timeout = 10; 27683cf7b233SMike Christie session->scsi_cmds_max = scsi_cmds; 27693cf7b233SMike Christie session->cmds_max = total_cmds; 2770e0726407SMike Christie session->queued_cmdsn = session->cmdsn = initial_cmdsn; 27717996a778SMike Christie session->exp_cmdsn = initial_cmdsn + 1; 27727996a778SMike Christie session->max_cmdsn = initial_cmdsn + 1; 27737996a778SMike Christie session->max_r2t = 1; 27747996a778SMike Christie session->tt = iscsit; 2775b8b9e1b8SJayamohan Kallickal session->dd_data = cls_session->dd_data + sizeof(*session); 27766724add1SMike Christie mutex_init(&session->eh_mutex); 277775613521SMike Christie spin_lock_init(&session->lock); 27787996a778SMike Christie 27797996a778SMike Christie /* initialize SCSI PDU commands pool */ 27807996a778SMike Christie if (iscsi_pool_init(&session->cmdpool, session->cmds_max, 27817996a778SMike Christie (void***)&session->cmds, 27829c19a7d0SMike Christie cmd_task_size + sizeof(struct iscsi_task))) 27837996a778SMike Christie goto cmdpool_alloc_fail; 27847996a778SMike Christie 27857996a778SMike Christie /* pre-format cmds pool with ITT */ 27867996a778SMike Christie for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { 27879c19a7d0SMike Christie struct iscsi_task *task = session->cmds[cmd_i]; 27887996a778SMike Christie 27899c19a7d0SMike Christie if (cmd_task_size) 27909c19a7d0SMike Christie task->dd_data = &task[1]; 27919c19a7d0SMike Christie task->itt = cmd_i; 27923bbaaad9SMike Christie task->state = ISCSI_TASK_FREE; 27939c19a7d0SMike Christie INIT_LIST_HEAD(&task->running); 27947996a778SMike Christie } 27957996a778SMike Christie 2796f53a88daSMike Christie if (!try_module_get(iscsit->owner)) 279775613521SMike Christie goto module_get_fail; 279875613521SMike Christie 27997970634bSMike Christie if (iscsi_add_session(cls_session, id)) 2800f53a88daSMike Christie goto cls_session_fail; 2801e5bd7b54SMike Christie 28027996a778SMike Christie return cls_session; 28037996a778SMike Christie 28047996a778SMike Christie cls_session_fail: 280575613521SMike Christie module_put(iscsit->owner); 280675613521SMike Christie module_get_fail: 28076320377fSOlaf Kirch iscsi_pool_free(&session->cmdpool); 28087996a778SMike Christie cmdpool_alloc_fail: 280975613521SMike Christie iscsi_free_session(cls_session); 2810e5bd7b54SMike Christie dec_session_count: 2811e5bd7b54SMike Christie iscsi_host_dec_session_cnt(shost); 28127996a778SMike Christie return NULL; 28137996a778SMike Christie } 28147996a778SMike Christie EXPORT_SYMBOL_GPL(iscsi_session_setup); 28157996a778SMike Christie 28167996a778SMike Christie /** 28177996a778SMike Christie * iscsi_session_teardown - destroy session, host, and cls_session 281875613521SMike Christie * @cls_session: iscsi session 28197996a778SMike Christie * 282075613521SMike Christie * The driver must have called iscsi_remove_session before 282175613521SMike Christie * calling this. 282275613521SMike Christie */ 28237996a778SMike Christie void iscsi_session_teardown(struct iscsi_cls_session *cls_session) 28247996a778SMike Christie { 282575613521SMike Christie struct iscsi_session *session = cls_session->dd_data; 282663f75cc8SMike Christie struct module *owner = cls_session->transport->owner; 2827e5bd7b54SMike Christie struct Scsi_Host *shost = session->host; 28287996a778SMike Christie 28296320377fSOlaf Kirch iscsi_pool_free(&session->cmdpool); 28307996a778SMike Christie 2831b2c64167SMike Christie kfree(session->password); 2832b2c64167SMike Christie kfree(session->password_in); 2833b2c64167SMike Christie kfree(session->username); 2834b2c64167SMike Christie kfree(session->username_in); 2835f3ff0c36SMike Christie kfree(session->targetname); 283688dfd340SMike Christie kfree(session->initiatorname); 283788dfd340SMike Christie kfree(session->ifacename); 2838f3ff0c36SMike Christie 283975613521SMike Christie iscsi_destroy_session(cls_session); 2840e5bd7b54SMike Christie iscsi_host_dec_session_cnt(shost); 284163f75cc8SMike Christie module_put(owner); 28427996a778SMike Christie } 28437996a778SMike Christie EXPORT_SYMBOL_GPL(iscsi_session_teardown); 28447996a778SMike Christie 28457996a778SMike Christie /** 28467996a778SMike Christie * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn 28477996a778SMike Christie * @cls_session: iscsi_cls_session 28485d91e209SMike Christie * @dd_size: private driver data size 28497996a778SMike Christie * @conn_idx: cid 28505d91e209SMike Christie */ 28517996a778SMike Christie struct iscsi_cls_conn * 28525d91e209SMike Christie iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size, 28535d91e209SMike Christie uint32_t conn_idx) 28547996a778SMike Christie { 285575613521SMike Christie struct iscsi_session *session = cls_session->dd_data; 28567996a778SMike Christie struct iscsi_conn *conn; 28577996a778SMike Christie struct iscsi_cls_conn *cls_conn; 2858d36ab6f3SMike Christie char *data; 28597996a778SMike Christie 28605d91e209SMike Christie cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size, 28615d91e209SMike Christie conn_idx); 28627996a778SMike Christie if (!cls_conn) 28637996a778SMike Christie return NULL; 28647996a778SMike Christie conn = cls_conn->dd_data; 28655d91e209SMike Christie memset(conn, 0, sizeof(*conn) + dd_size); 28667996a778SMike Christie 28675d91e209SMike Christie conn->dd_data = cls_conn->dd_data + sizeof(*conn); 28687996a778SMike Christie conn->session = session; 28697996a778SMike Christie conn->cls_conn = cls_conn; 28707996a778SMike Christie conn->c_stage = ISCSI_CONN_INITIAL_STAGE; 28717996a778SMike Christie conn->id = conn_idx; 28727996a778SMike Christie conn->exp_statsn = 0; 2873843c0a8aSMike Christie conn->tmf_state = TMF_INITIAL; 2874f6d5180cSMike Christie 2875f6d5180cSMike Christie init_timer(&conn->transport_timer); 2876f6d5180cSMike Christie conn->transport_timer.data = (unsigned long)conn; 2877f6d5180cSMike Christie conn->transport_timer.function = iscsi_check_transport_timeouts; 2878f6d5180cSMike Christie 2879843c0a8aSMike Christie INIT_LIST_HEAD(&conn->mgmtqueue); 28803bbaaad9SMike Christie INIT_LIST_HEAD(&conn->cmdqueue); 2881843c0a8aSMike Christie INIT_LIST_HEAD(&conn->requeue); 2882c4028958SDavid Howells INIT_WORK(&conn->xmitwork, iscsi_xmitworker); 28837996a778SMike Christie 28849c19a7d0SMike Christie /* allocate login_task used for the login/text sequences */ 28857996a778SMike Christie spin_lock_bh(&session->lock); 28867acd72ebSStefani Seibold if (!kfifo_out(&session->cmdpool.queue, 28879c19a7d0SMike Christie (void*)&conn->login_task, 28887996a778SMike Christie sizeof(void*))) { 28897996a778SMike Christie spin_unlock_bh(&session->lock); 28909c19a7d0SMike Christie goto login_task_alloc_fail; 28917996a778SMike Christie } 28927996a778SMike Christie spin_unlock_bh(&session->lock); 28937996a778SMike Christie 2894cfeb2cf9SMike Christie data = (char *) __get_free_pages(GFP_KERNEL, 2895cfeb2cf9SMike Christie get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); 2896d36ab6f3SMike Christie if (!data) 28979c19a7d0SMike Christie goto login_task_data_alloc_fail; 28989c19a7d0SMike Christie conn->login_task->data = conn->data = data; 2899d36ab6f3SMike Christie 2900843c0a8aSMike Christie init_timer(&conn->tmf_timer); 29017996a778SMike Christie init_waitqueue_head(&conn->ehwait); 29027996a778SMike Christie 29037996a778SMike Christie return cls_conn; 29047996a778SMike Christie 29059c19a7d0SMike Christie login_task_data_alloc_fail: 29067acd72ebSStefani Seibold kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task, 2907d36ab6f3SMike Christie sizeof(void*)); 29089c19a7d0SMike Christie login_task_alloc_fail: 29097996a778SMike Christie iscsi_destroy_conn(cls_conn); 29107996a778SMike Christie return NULL; 29117996a778SMike Christie } 29127996a778SMike Christie EXPORT_SYMBOL_GPL(iscsi_conn_setup); 29137996a778SMike Christie 29147996a778SMike Christie /** 29157996a778SMike Christie * iscsi_conn_teardown - teardown iscsi connection 29167996a778SMike Christie * cls_conn: iscsi class connection 29177996a778SMike Christie * 29187996a778SMike Christie * TODO: we may need to make this into a two step process 29197996a778SMike Christie * like scsi-mls remove + put host 29207996a778SMike Christie */ 29217996a778SMike Christie void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) 29227996a778SMike Christie { 29237996a778SMike Christie struct iscsi_conn *conn = cls_conn->dd_data; 29247996a778SMike Christie struct iscsi_session *session = conn->session; 29257996a778SMike Christie unsigned long flags; 29267996a778SMike Christie 2927f6d5180cSMike Christie del_timer_sync(&conn->transport_timer); 2928f6d5180cSMike Christie 29297996a778SMike Christie spin_lock_bh(&session->lock); 29307996a778SMike Christie conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; 29317996a778SMike Christie if (session->leadconn == conn) { 29327996a778SMike Christie /* 29337996a778SMike Christie * leading connection? then give up on recovery. 29347996a778SMike Christie */ 29357996a778SMike Christie session->state = ISCSI_STATE_TERMINATE; 29367996a778SMike Christie wake_up(&conn->ehwait); 29377996a778SMike Christie } 29387996a778SMike Christie spin_unlock_bh(&session->lock); 29397996a778SMike Christie 29407996a778SMike Christie /* 29417996a778SMike Christie * Block until all in-progress commands for this connection 29427996a778SMike Christie * time out or fail. 29437996a778SMike Christie */ 29447996a778SMike Christie for (;;) { 29457996a778SMike Christie spin_lock_irqsave(session->host->host_lock, flags); 29467996a778SMike Christie if (!session->host->host_busy) { /* OK for ERL == 0 */ 29477996a778SMike Christie spin_unlock_irqrestore(session->host->host_lock, flags); 29487996a778SMike Christie break; 29497996a778SMike Christie } 29507996a778SMike Christie spin_unlock_irqrestore(session->host->host_lock, flags); 29517996a778SMike Christie msleep_interruptible(500); 2952322d739dSMike Christie iscsi_conn_printk(KERN_INFO, conn, "iscsi conn_destroy(): " 2953322d739dSMike Christie "host_busy %d host_failed %d\n", 2954322d739dSMike Christie session->host->host_busy, 2955be2df72eSOr Gerlitz session->host->host_failed); 29567996a778SMike Christie /* 29577996a778SMike Christie * force eh_abort() to unblock 29587996a778SMike Christie */ 29597996a778SMike Christie wake_up(&conn->ehwait); 29607996a778SMike Christie } 29617996a778SMike Christie 2962779ea120SMike Christie /* flush queued up work because we free the connection below */ 2963843c0a8aSMike Christie iscsi_suspend_tx(conn); 2964779ea120SMike Christie 29657996a778SMike Christie spin_lock_bh(&session->lock); 2966cfeb2cf9SMike Christie free_pages((unsigned long) conn->data, 2967cfeb2cf9SMike Christie get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); 2968f3ff0c36SMike Christie kfree(conn->persistent_address); 29697acd72ebSStefani Seibold kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task, 29707996a778SMike Christie sizeof(void*)); 2971e0726407SMike Christie if (session->leadconn == conn) 29727996a778SMike Christie session->leadconn = NULL; 29737996a778SMike Christie spin_unlock_bh(&session->lock); 29747996a778SMike Christie 29757996a778SMike Christie iscsi_destroy_conn(cls_conn); 29767996a778SMike Christie } 29777996a778SMike Christie EXPORT_SYMBOL_GPL(iscsi_conn_teardown); 29787996a778SMike Christie 29797996a778SMike Christie int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) 29807996a778SMike Christie { 29817996a778SMike Christie struct iscsi_conn *conn = cls_conn->dd_data; 29827996a778SMike Christie struct iscsi_session *session = conn->session; 29837996a778SMike Christie 2984ffd0436eSMike Christie if (!session) { 2985322d739dSMike Christie iscsi_conn_printk(KERN_ERR, conn, 2986322d739dSMike Christie "can't start unbound connection\n"); 29877996a778SMike Christie return -EPERM; 29887996a778SMike Christie } 29897996a778SMike Christie 2990db98ccdeSMike Christie if ((session->imm_data_en || !session->initial_r2t_en) && 2991db98ccdeSMike Christie session->first_burst > session->max_burst) { 2992322d739dSMike Christie iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: " 2993ffd0436eSMike Christie "first_burst %d max_burst %d\n", 2994ffd0436eSMike Christie session->first_burst, session->max_burst); 2995ffd0436eSMike Christie return -EINVAL; 2996ffd0436eSMike Christie } 2997ffd0436eSMike Christie 2998f6d5180cSMike Christie if (conn->ping_timeout && !conn->recv_timeout) { 2999322d739dSMike Christie iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of " 3000322d739dSMike Christie "zero. Using 5 seconds\n."); 3001f6d5180cSMike Christie conn->recv_timeout = 5; 3002f6d5180cSMike Christie } 3003f6d5180cSMike Christie 3004f6d5180cSMike Christie if (conn->recv_timeout && !conn->ping_timeout) { 3005322d739dSMike Christie iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of " 3006322d739dSMike Christie "zero. Using 5 seconds.\n"); 3007f6d5180cSMike Christie conn->ping_timeout = 5; 3008f6d5180cSMike Christie } 3009f6d5180cSMike Christie 30107996a778SMike Christie spin_lock_bh(&session->lock); 30117996a778SMike Christie conn->c_stage = ISCSI_CONN_STARTED; 30127996a778SMike Christie session->state = ISCSI_STATE_LOGGED_IN; 3013e0726407SMike Christie session->queued_cmdsn = session->cmdsn; 30147996a778SMike Christie 3015f6d5180cSMike Christie conn->last_recv = jiffies; 3016f6d5180cSMike Christie conn->last_ping = jiffies; 3017f6d5180cSMike Christie if (conn->recv_timeout && conn->ping_timeout) 3018f6d5180cSMike Christie mod_timer(&conn->transport_timer, 3019f6d5180cSMike Christie jiffies + (conn->recv_timeout * HZ)); 3020f6d5180cSMike Christie 30217996a778SMike Christie switch(conn->stop_stage) { 30227996a778SMike Christie case STOP_CONN_RECOVER: 30237996a778SMike Christie /* 30247996a778SMike Christie * unblock eh_abort() if it is blocked. re-try all 30257996a778SMike Christie * commands after successful recovery 30267996a778SMike Christie */ 30277996a778SMike Christie conn->stop_stage = 0; 3028843c0a8aSMike Christie conn->tmf_state = TMF_INITIAL; 30297996a778SMike Christie session->age++; 30308b1d0343SMike Christie if (session->age == 16) 30318b1d0343SMike Christie session->age = 0; 30326eabafbeSMike Christie break; 30337996a778SMike Christie case STOP_CONN_TERM: 30347996a778SMike Christie conn->stop_stage = 0; 30357996a778SMike Christie break; 30367996a778SMike Christie default: 30377996a778SMike Christie break; 30387996a778SMike Christie } 30397996a778SMike Christie spin_unlock_bh(&session->lock); 30407996a778SMike Christie 304175613521SMike Christie iscsi_unblock_session(session->cls_session); 30426eabafbeSMike Christie wake_up(&conn->ehwait); 30437996a778SMike Christie return 0; 30447996a778SMike Christie } 30457996a778SMike Christie EXPORT_SYMBOL_GPL(iscsi_conn_start); 30467996a778SMike Christie 30477996a778SMike Christie static void 30483bbaaad9SMike Christie fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn) 30497996a778SMike Christie { 30503bbaaad9SMike Christie struct iscsi_task *task; 3051b3cd5050SMike Christie int i, state; 30527996a778SMike Christie 30533bbaaad9SMike Christie for (i = 0; i < conn->session->cmds_max; i++) { 30543bbaaad9SMike Christie task = conn->session->cmds[i]; 30553bbaaad9SMike Christie if (task->sc) 30563bbaaad9SMike Christie continue; 30573bbaaad9SMike Christie 30583bbaaad9SMike Christie if (task->state == ISCSI_TASK_FREE) 30593bbaaad9SMike Christie continue; 30603bbaaad9SMike Christie 30613bbaaad9SMike Christie ISCSI_DBG_SESSION(conn->session, 30623bbaaad9SMike Christie "failing mgmt itt 0x%x state %d\n", 30633bbaaad9SMike Christie task->itt, task->state); 3064b3cd5050SMike Christie state = ISCSI_TASK_ABRT_SESS_RECOV; 3065b3cd5050SMike Christie if (task->state == ISCSI_TASK_PENDING) 3066b3cd5050SMike Christie state = ISCSI_TASK_COMPLETED; 3067b3cd5050SMike Christie iscsi_complete_task(task, state); 3068b3cd5050SMike Christie 30697996a778SMike Christie } 30707996a778SMike Christie } 30717996a778SMike Christie 3072656cffc9SMike Christie static void iscsi_start_session_recovery(struct iscsi_session *session, 30737996a778SMike Christie struct iscsi_conn *conn, int flag) 30747996a778SMike Christie { 3075ed2abc7fSMike Christie int old_stop_stage; 3076ed2abc7fSMike Christie 30776724add1SMike Christie mutex_lock(&session->eh_mutex); 30787996a778SMike Christie spin_lock_bh(&session->lock); 3079ed2abc7fSMike Christie if (conn->stop_stage == STOP_CONN_TERM) { 30807996a778SMike Christie spin_unlock_bh(&session->lock); 30816724add1SMike Christie mutex_unlock(&session->eh_mutex); 30826724add1SMike Christie return; 30836724add1SMike Christie } 30846724add1SMike Christie 30856724add1SMike Christie /* 3086ed2abc7fSMike Christie * When this is called for the in_login state, we only want to clean 30879c19a7d0SMike Christie * up the login task and connection. We do not need to block and set 308867a61114SMike Christie * the recovery state again 3089ed2abc7fSMike Christie */ 309067a61114SMike Christie if (flag == STOP_CONN_TERM) 309167a61114SMike Christie session->state = ISCSI_STATE_TERMINATE; 309267a61114SMike Christie else if (conn->stop_stage != STOP_CONN_RECOVER) 309367a61114SMike Christie session->state = ISCSI_STATE_IN_RECOVERY; 30944ae0a6c1SMike Christie 30954ae0a6c1SMike Christie old_stop_stage = conn->stop_stage; 30964ae0a6c1SMike Christie conn->stop_stage = flag; 309726013ad4SMike Christie spin_unlock_bh(&session->lock); 3098ed2abc7fSMike Christie 309926013ad4SMike Christie del_timer_sync(&conn->transport_timer); 310026013ad4SMike Christie iscsi_suspend_tx(conn); 310126013ad4SMike Christie 310226013ad4SMike Christie spin_lock_bh(&session->lock); 310367a61114SMike Christie conn->c_stage = ISCSI_CONN_STOPPED; 31047996a778SMike Christie spin_unlock_bh(&session->lock); 31056724add1SMike Christie 31067996a778SMike Christie /* 31077996a778SMike Christie * for connection level recovery we should not calculate 31087996a778SMike Christie * header digest. conn->hdr_size used for optimization 31097996a778SMike Christie * in hdr_extract() and will be re-negotiated at 31107996a778SMike Christie * set_param() time. 31117996a778SMike Christie */ 31127996a778SMike Christie if (flag == STOP_CONN_RECOVER) { 31137996a778SMike Christie conn->hdrdgst_en = 0; 31147996a778SMike Christie conn->datadgst_en = 0; 3115656cffc9SMike Christie if (session->state == ISCSI_STATE_IN_RECOVERY && 311667a61114SMike Christie old_stop_stage != STOP_CONN_RECOVER) { 31171b2c7af8SMike Christie ISCSI_DBG_SESSION(session, "blocking session\n"); 311875613521SMike Christie iscsi_block_session(session->cls_session); 31197996a778SMike Christie } 312067a61114SMike Christie } 3121656cffc9SMike Christie 3122656cffc9SMike Christie /* 3123656cffc9SMike Christie * flush queues. 3124656cffc9SMike Christie */ 3125656cffc9SMike Christie spin_lock_bh(&session->lock); 31263bbaaad9SMike Christie fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED); 31273bbaaad9SMike Christie fail_mgmt_tasks(session, conn); 31285d12c05eSMike Christie memset(&conn->tmhdr, 0, sizeof(conn->tmhdr)); 3129656cffc9SMike Christie spin_unlock_bh(&session->lock); 31306724add1SMike Christie mutex_unlock(&session->eh_mutex); 31317996a778SMike Christie } 31327996a778SMike Christie 31337996a778SMike Christie void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) 31347996a778SMike Christie { 31357996a778SMike Christie struct iscsi_conn *conn = cls_conn->dd_data; 31367996a778SMike Christie struct iscsi_session *session = conn->session; 31377996a778SMike Christie 31387996a778SMike Christie switch (flag) { 31397996a778SMike Christie case STOP_CONN_RECOVER: 31407996a778SMike Christie case STOP_CONN_TERM: 31417996a778SMike Christie iscsi_start_session_recovery(session, conn, flag); 31428d2860b3SMike Christie break; 31437996a778SMike Christie default: 3144322d739dSMike Christie iscsi_conn_printk(KERN_ERR, conn, 3145322d739dSMike Christie "invalid stop flag %d\n", flag); 31467996a778SMike Christie } 31477996a778SMike Christie } 31487996a778SMike Christie EXPORT_SYMBOL_GPL(iscsi_conn_stop); 31497996a778SMike Christie 31507996a778SMike Christie int iscsi_conn_bind(struct iscsi_cls_session *cls_session, 31517996a778SMike Christie struct iscsi_cls_conn *cls_conn, int is_leading) 31527996a778SMike Christie { 315375613521SMike Christie struct iscsi_session *session = cls_session->dd_data; 315498644047SMike Christie struct iscsi_conn *conn = cls_conn->dd_data; 31557996a778SMike Christie 31567996a778SMike Christie spin_lock_bh(&session->lock); 31577996a778SMike Christie if (is_leading) 31587996a778SMike Christie session->leadconn = conn; 315998644047SMike Christie spin_unlock_bh(&session->lock); 31607996a778SMike Christie 31617996a778SMike Christie /* 31627996a778SMike Christie * Unblock xmitworker(), Login Phase will pass through. 31637996a778SMike Christie */ 31647996a778SMike Christie clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); 31657996a778SMike Christie clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); 31667996a778SMike Christie return 0; 31677996a778SMike Christie } 31687996a778SMike Christie EXPORT_SYMBOL_GPL(iscsi_conn_bind); 31697996a778SMike Christie 31705700b1afSMike Christie static int iscsi_switch_str_param(char **param, char *new_val_buf) 31715700b1afSMike Christie { 31725700b1afSMike Christie char *new_val; 31735700b1afSMike Christie 31745700b1afSMike Christie if (*param) { 31755700b1afSMike Christie if (!strcmp(*param, new_val_buf)) 31765700b1afSMike Christie return 0; 31775700b1afSMike Christie } 31785700b1afSMike Christie 31795700b1afSMike Christie new_val = kstrdup(new_val_buf, GFP_NOIO); 31805700b1afSMike Christie if (!new_val) 31815700b1afSMike Christie return -ENOMEM; 31825700b1afSMike Christie 31835700b1afSMike Christie kfree(*param); 31845700b1afSMike Christie *param = new_val; 31855700b1afSMike Christie return 0; 31865700b1afSMike Christie } 3187a54a52caSMike Christie 3188a54a52caSMike Christie int iscsi_set_param(struct iscsi_cls_conn *cls_conn, 3189a54a52caSMike Christie enum iscsi_param param, char *buf, int buflen) 3190a54a52caSMike Christie { 3191a54a52caSMike Christie struct iscsi_conn *conn = cls_conn->dd_data; 3192a54a52caSMike Christie struct iscsi_session *session = conn->session; 3193a54a52caSMike Christie uint32_t value; 3194a54a52caSMike Christie 3195a54a52caSMike Christie switch(param) { 3196843c0a8aSMike Christie case ISCSI_PARAM_FAST_ABORT: 3197843c0a8aSMike Christie sscanf(buf, "%d", &session->fast_abort); 3198843c0a8aSMike Christie break; 3199f6d5180cSMike Christie case ISCSI_PARAM_ABORT_TMO: 3200f6d5180cSMike Christie sscanf(buf, "%d", &session->abort_timeout); 3201f6d5180cSMike Christie break; 3202f6d5180cSMike Christie case ISCSI_PARAM_LU_RESET_TMO: 3203f6d5180cSMike Christie sscanf(buf, "%d", &session->lu_reset_timeout); 3204f6d5180cSMike Christie break; 32053fe5ae8bSMike Christie case ISCSI_PARAM_TGT_RESET_TMO: 32063fe5ae8bSMike Christie sscanf(buf, "%d", &session->tgt_reset_timeout); 32073fe5ae8bSMike Christie break; 3208f6d5180cSMike Christie case ISCSI_PARAM_PING_TMO: 3209f6d5180cSMike Christie sscanf(buf, "%d", &conn->ping_timeout); 3210f6d5180cSMike Christie break; 3211f6d5180cSMike Christie case ISCSI_PARAM_RECV_TMO: 3212f6d5180cSMike Christie sscanf(buf, "%d", &conn->recv_timeout); 3213f6d5180cSMike Christie break; 3214a54a52caSMike Christie case ISCSI_PARAM_MAX_RECV_DLENGTH: 3215a54a52caSMike Christie sscanf(buf, "%d", &conn->max_recv_dlength); 3216a54a52caSMike Christie break; 3217a54a52caSMike Christie case ISCSI_PARAM_MAX_XMIT_DLENGTH: 3218a54a52caSMike Christie sscanf(buf, "%d", &conn->max_xmit_dlength); 3219a54a52caSMike Christie break; 3220a54a52caSMike Christie case ISCSI_PARAM_HDRDGST_EN: 3221a54a52caSMike Christie sscanf(buf, "%d", &conn->hdrdgst_en); 3222a54a52caSMike Christie break; 3223a54a52caSMike Christie case ISCSI_PARAM_DATADGST_EN: 3224a54a52caSMike Christie sscanf(buf, "%d", &conn->datadgst_en); 3225a54a52caSMike Christie break; 3226a54a52caSMike Christie case ISCSI_PARAM_INITIAL_R2T_EN: 3227a54a52caSMike Christie sscanf(buf, "%d", &session->initial_r2t_en); 3228a54a52caSMike Christie break; 3229a54a52caSMike Christie case ISCSI_PARAM_MAX_R2T: 3230a54a52caSMike Christie sscanf(buf, "%d", &session->max_r2t); 3231a54a52caSMike Christie break; 3232a54a52caSMike Christie case ISCSI_PARAM_IMM_DATA_EN: 3233a54a52caSMike Christie sscanf(buf, "%d", &session->imm_data_en); 3234a54a52caSMike Christie break; 3235a54a52caSMike Christie case ISCSI_PARAM_FIRST_BURST: 3236a54a52caSMike Christie sscanf(buf, "%d", &session->first_burst); 3237a54a52caSMike Christie break; 3238a54a52caSMike Christie case ISCSI_PARAM_MAX_BURST: 3239a54a52caSMike Christie sscanf(buf, "%d", &session->max_burst); 3240a54a52caSMike Christie break; 3241a54a52caSMike Christie case ISCSI_PARAM_PDU_INORDER_EN: 3242a54a52caSMike Christie sscanf(buf, "%d", &session->pdu_inorder_en); 3243a54a52caSMike Christie break; 3244a54a52caSMike Christie case ISCSI_PARAM_DATASEQ_INORDER_EN: 3245a54a52caSMike Christie sscanf(buf, "%d", &session->dataseq_inorder_en); 3246a54a52caSMike Christie break; 3247a54a52caSMike Christie case ISCSI_PARAM_ERL: 3248a54a52caSMike Christie sscanf(buf, "%d", &session->erl); 3249a54a52caSMike Christie break; 3250a54a52caSMike Christie case ISCSI_PARAM_IFMARKER_EN: 3251a54a52caSMike Christie sscanf(buf, "%d", &value); 3252a54a52caSMike Christie BUG_ON(value); 3253a54a52caSMike Christie break; 3254a54a52caSMike Christie case ISCSI_PARAM_OFMARKER_EN: 3255a54a52caSMike Christie sscanf(buf, "%d", &value); 3256a54a52caSMike Christie BUG_ON(value); 3257a54a52caSMike Christie break; 3258a54a52caSMike Christie case ISCSI_PARAM_EXP_STATSN: 3259a54a52caSMike Christie sscanf(buf, "%u", &conn->exp_statsn); 3260a54a52caSMike Christie break; 3261b2c64167SMike Christie case ISCSI_PARAM_USERNAME: 32625700b1afSMike Christie return iscsi_switch_str_param(&session->username, buf); 3263b2c64167SMike Christie case ISCSI_PARAM_USERNAME_IN: 32645700b1afSMike Christie return iscsi_switch_str_param(&session->username_in, buf); 3265b2c64167SMike Christie case ISCSI_PARAM_PASSWORD: 32665700b1afSMike Christie return iscsi_switch_str_param(&session->password, buf); 3267b2c64167SMike Christie case ISCSI_PARAM_PASSWORD_IN: 32685700b1afSMike Christie return iscsi_switch_str_param(&session->password_in, buf); 3269a54a52caSMike Christie case ISCSI_PARAM_TARGET_NAME: 32705700b1afSMike Christie return iscsi_switch_str_param(&session->targetname, buf); 3271a54a52caSMike Christie case ISCSI_PARAM_TPGT: 3272a54a52caSMike Christie sscanf(buf, "%d", &session->tpgt); 3273a54a52caSMike Christie break; 3274a54a52caSMike Christie case ISCSI_PARAM_PERSISTENT_PORT: 3275a54a52caSMike Christie sscanf(buf, "%d", &conn->persistent_port); 3276a54a52caSMike Christie break; 3277a54a52caSMike Christie case ISCSI_PARAM_PERSISTENT_ADDRESS: 32785700b1afSMike Christie return iscsi_switch_str_param(&conn->persistent_address, buf); 327988dfd340SMike Christie case ISCSI_PARAM_IFACE_NAME: 32805700b1afSMike Christie return iscsi_switch_str_param(&session->ifacename, buf); 328188dfd340SMike Christie case ISCSI_PARAM_INITIATOR_NAME: 32825700b1afSMike Christie return iscsi_switch_str_param(&session->initiatorname, buf); 3283a54a52caSMike Christie default: 3284a54a52caSMike Christie return -ENOSYS; 3285a54a52caSMike Christie } 3286a54a52caSMike Christie 3287a54a52caSMike Christie return 0; 3288a54a52caSMike Christie } 3289a54a52caSMike Christie EXPORT_SYMBOL_GPL(iscsi_set_param); 3290a54a52caSMike Christie 3291a54a52caSMike Christie int iscsi_session_get_param(struct iscsi_cls_session *cls_session, 3292a54a52caSMike Christie enum iscsi_param param, char *buf) 3293a54a52caSMike Christie { 329475613521SMike Christie struct iscsi_session *session = cls_session->dd_data; 3295a54a52caSMike Christie int len; 3296a54a52caSMike Christie 3297a54a52caSMike Christie switch(param) { 3298843c0a8aSMike Christie case ISCSI_PARAM_FAST_ABORT: 3299843c0a8aSMike Christie len = sprintf(buf, "%d\n", session->fast_abort); 3300843c0a8aSMike Christie break; 3301f6d5180cSMike Christie case ISCSI_PARAM_ABORT_TMO: 3302f6d5180cSMike Christie len = sprintf(buf, "%d\n", session->abort_timeout); 3303f6d5180cSMike Christie break; 3304f6d5180cSMike Christie case ISCSI_PARAM_LU_RESET_TMO: 3305f6d5180cSMike Christie len = sprintf(buf, "%d\n", session->lu_reset_timeout); 3306f6d5180cSMike Christie break; 33073fe5ae8bSMike Christie case ISCSI_PARAM_TGT_RESET_TMO: 33083fe5ae8bSMike Christie len = sprintf(buf, "%d\n", session->tgt_reset_timeout); 33093fe5ae8bSMike Christie break; 3310a54a52caSMike Christie case ISCSI_PARAM_INITIAL_R2T_EN: 3311a54a52caSMike Christie len = sprintf(buf, "%d\n", session->initial_r2t_en); 3312a54a52caSMike Christie break; 3313a54a52caSMike Christie case ISCSI_PARAM_MAX_R2T: 3314a54a52caSMike Christie len = sprintf(buf, "%hu\n", session->max_r2t); 3315a54a52caSMike Christie break; 3316a54a52caSMike Christie case ISCSI_PARAM_IMM_DATA_EN: 3317a54a52caSMike Christie len = sprintf(buf, "%d\n", session->imm_data_en); 3318a54a52caSMike Christie break; 3319a54a52caSMike Christie case ISCSI_PARAM_FIRST_BURST: 3320a54a52caSMike Christie len = sprintf(buf, "%u\n", session->first_burst); 3321a54a52caSMike Christie break; 3322a54a52caSMike Christie case ISCSI_PARAM_MAX_BURST: 3323a54a52caSMike Christie len = sprintf(buf, "%u\n", session->max_burst); 3324a54a52caSMike Christie break; 3325a54a52caSMike Christie case ISCSI_PARAM_PDU_INORDER_EN: 3326a54a52caSMike Christie len = sprintf(buf, "%d\n", session->pdu_inorder_en); 3327a54a52caSMike Christie break; 3328a54a52caSMike Christie case ISCSI_PARAM_DATASEQ_INORDER_EN: 3329a54a52caSMike Christie len = sprintf(buf, "%d\n", session->dataseq_inorder_en); 3330a54a52caSMike Christie break; 3331a54a52caSMike Christie case ISCSI_PARAM_ERL: 3332a54a52caSMike Christie len = sprintf(buf, "%d\n", session->erl); 3333a54a52caSMike Christie break; 3334a54a52caSMike Christie case ISCSI_PARAM_TARGET_NAME: 3335a54a52caSMike Christie len = sprintf(buf, "%s\n", session->targetname); 3336a54a52caSMike Christie break; 3337a54a52caSMike Christie case ISCSI_PARAM_TPGT: 3338a54a52caSMike Christie len = sprintf(buf, "%d\n", session->tpgt); 3339a54a52caSMike Christie break; 3340b2c64167SMike Christie case ISCSI_PARAM_USERNAME: 3341b2c64167SMike Christie len = sprintf(buf, "%s\n", session->username); 3342b2c64167SMike Christie break; 3343b2c64167SMike Christie case ISCSI_PARAM_USERNAME_IN: 3344b2c64167SMike Christie len = sprintf(buf, "%s\n", session->username_in); 3345b2c64167SMike Christie break; 3346b2c64167SMike Christie case ISCSI_PARAM_PASSWORD: 3347b2c64167SMike Christie len = sprintf(buf, "%s\n", session->password); 3348b2c64167SMike Christie break; 3349b2c64167SMike Christie case ISCSI_PARAM_PASSWORD_IN: 3350b2c64167SMike Christie len = sprintf(buf, "%s\n", session->password_in); 3351b2c64167SMike Christie break; 335288dfd340SMike Christie case ISCSI_PARAM_IFACE_NAME: 335388dfd340SMike Christie len = sprintf(buf, "%s\n", session->ifacename); 335488dfd340SMike Christie break; 335588dfd340SMike Christie case ISCSI_PARAM_INITIATOR_NAME: 335688dfd340SMike Christie len = sprintf(buf, "%s\n", session->initiatorname); 335788dfd340SMike Christie break; 3358a54a52caSMike Christie default: 3359a54a52caSMike Christie return -ENOSYS; 3360a54a52caSMike Christie } 3361a54a52caSMike Christie 3362a54a52caSMike Christie return len; 3363a54a52caSMike Christie } 3364a54a52caSMike Christie EXPORT_SYMBOL_GPL(iscsi_session_get_param); 3365a54a52caSMike Christie 3366a54a52caSMike Christie int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, 3367a54a52caSMike Christie enum iscsi_param param, char *buf) 3368a54a52caSMike Christie { 3369a54a52caSMike Christie struct iscsi_conn *conn = cls_conn->dd_data; 3370a54a52caSMike Christie int len; 3371a54a52caSMike Christie 3372a54a52caSMike Christie switch(param) { 3373f6d5180cSMike Christie case ISCSI_PARAM_PING_TMO: 3374f6d5180cSMike Christie len = sprintf(buf, "%u\n", conn->ping_timeout); 3375f6d5180cSMike Christie break; 3376f6d5180cSMike Christie case ISCSI_PARAM_RECV_TMO: 3377f6d5180cSMike Christie len = sprintf(buf, "%u\n", conn->recv_timeout); 3378f6d5180cSMike Christie break; 3379a54a52caSMike Christie case ISCSI_PARAM_MAX_RECV_DLENGTH: 3380a54a52caSMike Christie len = sprintf(buf, "%u\n", conn->max_recv_dlength); 3381a54a52caSMike Christie break; 3382a54a52caSMike Christie case ISCSI_PARAM_MAX_XMIT_DLENGTH: 3383a54a52caSMike Christie len = sprintf(buf, "%u\n", conn->max_xmit_dlength); 3384a54a52caSMike Christie break; 3385a54a52caSMike Christie case ISCSI_PARAM_HDRDGST_EN: 3386a54a52caSMike Christie len = sprintf(buf, "%d\n", conn->hdrdgst_en); 3387a54a52caSMike Christie break; 3388a54a52caSMike Christie case ISCSI_PARAM_DATADGST_EN: 3389a54a52caSMike Christie len = sprintf(buf, "%d\n", conn->datadgst_en); 3390a54a52caSMike Christie break; 3391a54a52caSMike Christie case ISCSI_PARAM_IFMARKER_EN: 3392a54a52caSMike Christie len = sprintf(buf, "%d\n", conn->ifmarker_en); 3393a54a52caSMike Christie break; 3394a54a52caSMike Christie case ISCSI_PARAM_OFMARKER_EN: 3395a54a52caSMike Christie len = sprintf(buf, "%d\n", conn->ofmarker_en); 3396a54a52caSMike Christie break; 3397a54a52caSMike Christie case ISCSI_PARAM_EXP_STATSN: 3398a54a52caSMike Christie len = sprintf(buf, "%u\n", conn->exp_statsn); 3399a54a52caSMike Christie break; 3400a54a52caSMike Christie case ISCSI_PARAM_PERSISTENT_PORT: 3401a54a52caSMike Christie len = sprintf(buf, "%d\n", conn->persistent_port); 3402a54a52caSMike Christie break; 3403a54a52caSMike Christie case ISCSI_PARAM_PERSISTENT_ADDRESS: 3404a54a52caSMike Christie len = sprintf(buf, "%s\n", conn->persistent_address); 3405a54a52caSMike Christie break; 3406a54a52caSMike Christie default: 3407a54a52caSMike Christie return -ENOSYS; 3408a54a52caSMike Christie } 3409a54a52caSMike Christie 3410a54a52caSMike Christie return len; 3411a54a52caSMike Christie } 3412a54a52caSMike Christie EXPORT_SYMBOL_GPL(iscsi_conn_get_param); 3413a54a52caSMike Christie 34140801c242SMike Christie int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param, 34150801c242SMike Christie char *buf) 34160801c242SMike Christie { 341775613521SMike Christie struct iscsi_host *ihost = shost_priv(shost); 34180801c242SMike Christie int len; 34190801c242SMike Christie 34200801c242SMike Christie switch (param) { 3421d8196ed2SMike Christie case ISCSI_HOST_PARAM_NETDEV_NAME: 342275613521SMike Christie len = sprintf(buf, "%s\n", ihost->netdev); 3423d8196ed2SMike Christie break; 34240801c242SMike Christie case ISCSI_HOST_PARAM_HWADDRESS: 342575613521SMike Christie len = sprintf(buf, "%s\n", ihost->hwaddress); 34260801c242SMike Christie break; 34278ad5781aSMike Christie case ISCSI_HOST_PARAM_INITIATOR_NAME: 342875613521SMike Christie len = sprintf(buf, "%s\n", ihost->initiatorname); 34298ad5781aSMike Christie break; 343075613521SMike Christie case ISCSI_HOST_PARAM_IPADDRESS: 34315700b1afSMike Christie len = sprintf(buf, "%s\n", ihost->local_address); 343288dfd340SMike Christie break; 34330801c242SMike Christie default: 34340801c242SMike Christie return -ENOSYS; 34350801c242SMike Christie } 34360801c242SMike Christie 34370801c242SMike Christie return len; 34380801c242SMike Christie } 34390801c242SMike Christie EXPORT_SYMBOL_GPL(iscsi_host_get_param); 34400801c242SMike Christie 34410801c242SMike Christie int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param, 34420801c242SMike Christie char *buf, int buflen) 34430801c242SMike Christie { 344475613521SMike Christie struct iscsi_host *ihost = shost_priv(shost); 34450801c242SMike Christie 34460801c242SMike Christie switch (param) { 3447d8196ed2SMike Christie case ISCSI_HOST_PARAM_NETDEV_NAME: 34485700b1afSMike Christie return iscsi_switch_str_param(&ihost->netdev, buf); 34490801c242SMike Christie case ISCSI_HOST_PARAM_HWADDRESS: 34505700b1afSMike Christie return iscsi_switch_str_param(&ihost->hwaddress, buf); 34518ad5781aSMike Christie case ISCSI_HOST_PARAM_INITIATOR_NAME: 34525700b1afSMike Christie return iscsi_switch_str_param(&ihost->initiatorname, buf); 34530801c242SMike Christie default: 34540801c242SMike Christie return -ENOSYS; 34550801c242SMike Christie } 34560801c242SMike Christie 34570801c242SMike Christie return 0; 34580801c242SMike Christie } 34590801c242SMike Christie EXPORT_SYMBOL_GPL(iscsi_host_set_param); 34600801c242SMike Christie 34617996a778SMike Christie MODULE_AUTHOR("Mike Christie"); 34627996a778SMike Christie MODULE_DESCRIPTION("iSCSI library functions"); 34637996a778SMike Christie MODULE_LICENSE("GPL"); 3464