diff options
Diffstat (limited to 'drivers/scsi/libiscsi.c')
| -rw-r--r-- | drivers/scsi/libiscsi.c | 3679 |
1 files changed, 3679 insertions, 0 deletions
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c new file mode 100644 index 000000000..05799b419 --- /dev/null +++ b/drivers/scsi/libiscsi.c @@ -0,0 +1,3679 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * iSCSI lib functions + * + * Copyright (C) 2006 Red Hat, Inc. All rights reserved. + * Copyright (C) 2004 - 2006 Mike Christie + * Copyright (C) 2004 - 2005 Dmitry Yusupov + * Copyright (C) 2004 - 2005 Alex Aizman + * maintained by open-iscsi@googlegroups.com + */ +#include <linux/types.h> +#include <linux/kfifo.h> +#include <linux/delay.h> +#include <linux/log2.h> +#include <linux/slab.h> +#include <linux/sched/signal.h> +#include <linux/module.h> +#include <asm/unaligned.h> +#include <net/tcp.h> +#include <scsi/scsi_cmnd.h> +#include <scsi/scsi_device.h> +#include <scsi/scsi_eh.h> +#include <scsi/scsi_tcq.h> +#include <scsi/scsi_host.h> +#include <scsi/scsi.h> +#include <scsi/iscsi_proto.h> +#include <scsi/scsi_transport.h> +#include <scsi/scsi_transport_iscsi.h> +#include <scsi/libiscsi.h> +#include <trace/events/iscsi.h> + +static int iscsi_dbg_lib_conn; +module_param_named(debug_libiscsi_conn, iscsi_dbg_lib_conn, int, + S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(debug_libiscsi_conn, + "Turn on debugging for connections in libiscsi module. " + "Set to 1 to turn on, and zero to turn off. Default is off."); + +static int iscsi_dbg_lib_session; +module_param_named(debug_libiscsi_session, iscsi_dbg_lib_session, int, + S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(debug_libiscsi_session, + "Turn on debugging for sessions in libiscsi module. " + "Set to 1 to turn on, and zero to turn off. Default is off."); + +static int iscsi_dbg_lib_eh; +module_param_named(debug_libiscsi_eh, iscsi_dbg_lib_eh, int, + S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(debug_libiscsi_eh, + "Turn on debugging for error handling in libiscsi module. " + "Set to 1 to turn on, and zero to turn off. Default is off."); + +#define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \ + do { \ + if (iscsi_dbg_lib_conn) \ + iscsi_conn_printk(KERN_INFO, _conn, \ + "%s " dbg_fmt, \ + __func__, ##arg); \ + iscsi_dbg_trace(trace_iscsi_dbg_conn, \ + &(_conn)->cls_conn->dev, \ + "%s " dbg_fmt, __func__, ##arg);\ + } while (0); + +#define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \ + do { \ + if (iscsi_dbg_lib_session) \ + iscsi_session_printk(KERN_INFO, _session, \ + "%s " dbg_fmt, \ + __func__, ##arg); \ + iscsi_dbg_trace(trace_iscsi_dbg_session, \ + &(_session)->cls_session->dev, \ + "%s " dbg_fmt, __func__, ##arg); \ + } while (0); + +#define ISCSI_DBG_EH(_session, dbg_fmt, arg...) \ + do { \ + if (iscsi_dbg_lib_eh) \ + iscsi_session_printk(KERN_INFO, _session, \ + "%s " dbg_fmt, \ + __func__, ##arg); \ + iscsi_dbg_trace(trace_iscsi_dbg_eh, \ + &(_session)->cls_session->dev, \ + "%s " dbg_fmt, __func__, ##arg); \ + } while (0); + +inline void iscsi_conn_queue_work(struct iscsi_conn *conn) +{ + struct Scsi_Host *shost = conn->session->host; + struct iscsi_host *ihost = shost_priv(shost); + + if (ihost->workq) + queue_work(ihost->workq, &conn->xmitwork); +} +EXPORT_SYMBOL_GPL(iscsi_conn_queue_work); + +static void __iscsi_update_cmdsn(struct iscsi_session *session, + uint32_t exp_cmdsn, uint32_t max_cmdsn) +{ + /* + * standard specifies this check for when to update expected and + * max sequence numbers + */ + if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1)) + return; + + if (exp_cmdsn != session->exp_cmdsn && + !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn)) + session->exp_cmdsn = exp_cmdsn; + + if (max_cmdsn != session->max_cmdsn && + !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) + session->max_cmdsn = max_cmdsn; +} + +void iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr) +{ + __iscsi_update_cmdsn(session, be32_to_cpu(hdr->exp_cmdsn), + be32_to_cpu(hdr->max_cmdsn)); +} +EXPORT_SYMBOL_GPL(iscsi_update_cmdsn); + +/** + * iscsi_prep_data_out_pdu - initialize Data-Out + * @task: scsi command task + * @r2t: R2T info + * @hdr: iscsi data in pdu + * + * Notes: + * Initialize Data-Out within this R2T sequence and finds + * proper data_offset within this SCSI command. + * + * This function is called with connection lock taken. + **/ +void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t, + struct iscsi_data *hdr) +{ + struct iscsi_conn *conn = task->conn; + unsigned int left = r2t->data_length - r2t->sent; + + task->hdr_len = sizeof(struct iscsi_data); + + memset(hdr, 0, sizeof(struct iscsi_data)); + hdr->ttt = r2t->ttt; + hdr->datasn = cpu_to_be32(r2t->datasn); + r2t->datasn++; + hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; + hdr->lun = task->lun; + hdr->itt = task->hdr_itt; + hdr->exp_statsn = r2t->exp_statsn; + hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent); + if (left > conn->max_xmit_dlength) { + hton24(hdr->dlength, conn->max_xmit_dlength); + r2t->data_count = conn->max_xmit_dlength; + hdr->flags = 0; + } else { + hton24(hdr->dlength, left); + r2t->data_count = left; + hdr->flags = ISCSI_FLAG_CMD_FINAL; + } + conn->dataout_pdus_cnt++; +} +EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu); + +static int iscsi_add_hdr(struct iscsi_task *task, unsigned len) +{ + unsigned exp_len = task->hdr_len + len; + + if (exp_len > task->hdr_max) { + WARN_ON(1); + return -EINVAL; + } + + WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */ + task->hdr_len = exp_len; + return 0; +} + +/* + * make an extended cdb AHS + */ +static int iscsi_prep_ecdb_ahs(struct iscsi_task *task) +{ + struct scsi_cmnd *cmd = task->sc; + unsigned rlen, pad_len; + unsigned short ahslength; + struct iscsi_ecdb_ahdr *ecdb_ahdr; + int rc; + + ecdb_ahdr = iscsi_next_hdr(task); + rlen = cmd->cmd_len - ISCSI_CDB_SIZE; + + BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb)); + ahslength = rlen + sizeof(ecdb_ahdr->reserved); + + pad_len = iscsi_padding(rlen); + + rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) + + sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len); + if (rc) + return rc; + + if (pad_len) + memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len); + + ecdb_ahdr->ahslength = cpu_to_be16(ahslength); + ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB; + ecdb_ahdr->reserved = 0; + memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen); + + ISCSI_DBG_SESSION(task->conn->session, + "iscsi_prep_ecdb_ahs: varlen_cdb_len %d " + "rlen %d pad_len %d ahs_length %d iscsi_headers_size " + "%u\n", cmd->cmd_len, rlen, pad_len, ahslength, + task->hdr_len); + return 0; +} + +/** + * iscsi_check_tmf_restrictions - check if a task is affected by TMF + * @task: iscsi task + * @opcode: opcode to check for + * + * During TMF a task has to be checked if it's affected. + * All unrelated I/O can be passed through, but I/O to the + * affected LUN should be restricted. + * If 'fast_abort' is set we won't be sending any I/O to the + * affected LUN. + * Otherwise the target is waiting for all TTTs to be completed, + * so we have to send all outstanding Data-Out PDUs to the target. + */ +static int iscsi_check_tmf_restrictions(struct iscsi_task *task, int opcode) +{ + struct iscsi_session *session = task->conn->session; + struct iscsi_tm *tmf = &session->tmhdr; + u64 hdr_lun; + + if (session->tmf_state == TMF_INITIAL) + return 0; + + if ((tmf->opcode & ISCSI_OPCODE_MASK) != ISCSI_OP_SCSI_TMFUNC) + return 0; + + switch (ISCSI_TM_FUNC_VALUE(tmf)) { + case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: + /* + * Allow PDUs for unrelated LUNs + */ + hdr_lun = scsilun_to_int(&tmf->lun); + if (hdr_lun != task->sc->device->lun) + return 0; + fallthrough; + case ISCSI_TM_FUNC_TARGET_WARM_RESET: + /* + * Fail all SCSI cmd PDUs + */ + if (opcode != ISCSI_OP_SCSI_DATA_OUT) { + iscsi_session_printk(KERN_INFO, session, + "task [op %x itt 0x%x/0x%x] rejected.\n", + opcode, task->itt, task->hdr_itt); + return -EACCES; + } + /* + * And also all data-out PDUs in response to R2T + * if fast_abort is set. + */ + if (session->fast_abort) { + iscsi_session_printk(KERN_INFO, session, + "task [op %x itt 0x%x/0x%x] fast abort.\n", + opcode, task->itt, task->hdr_itt); + return -EACCES; + } + break; + case ISCSI_TM_FUNC_ABORT_TASK: + /* + * the caller has already checked if the task + * they want to abort was in the pending queue so if + * we are here the cmd pdu has gone out already, and + * we will only hit this for data-outs + */ + if (opcode == ISCSI_OP_SCSI_DATA_OUT && + task->hdr_itt == tmf->rtt) { + ISCSI_DBG_SESSION(session, + "Preventing task %x/%x from sending " + "data-out due to abort task in " + "progress\n", task->itt, + task->hdr_itt); + return -EACCES; + } + break; + } + + return 0; +} + +/** + * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu + * @task: iscsi task + * + * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set + * fields like dlength or final based on how much data it sends + */ +static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task) +{ + struct iscsi_conn *conn = task->conn; + struct iscsi_session *session = conn->session; + struct scsi_cmnd *sc = task->sc; + struct iscsi_scsi_req *hdr; + unsigned hdrlength, cmd_len, transfer_length; + itt_t itt; + int rc; + + rc = iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_CMD); + if (rc) + return rc; + + if (conn->session->tt->alloc_pdu) { + rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD); + if (rc) + return rc; + } + hdr = (struct iscsi_scsi_req *)task->hdr; + itt = hdr->itt; + memset(hdr, 0, sizeof(*hdr)); + + if (session->tt->parse_pdu_itt) + hdr->itt = task->hdr_itt = itt; + else + hdr->itt = task->hdr_itt = build_itt(task->itt, + task->conn->session->age); + task->hdr_len = 0; + rc = iscsi_add_hdr(task, sizeof(*hdr)); + if (rc) + return rc; + hdr->opcode = ISCSI_OP_SCSI_CMD; + hdr->flags = ISCSI_ATTR_SIMPLE; + int_to_scsilun(sc->device->lun, &hdr->lun); + task->lun = hdr->lun; + hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); + cmd_len = sc->cmd_len; + if (cmd_len < ISCSI_CDB_SIZE) + memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len); + else if (cmd_len > ISCSI_CDB_SIZE) { + rc = iscsi_prep_ecdb_ahs(task); + if (rc) + return rc; + cmd_len = ISCSI_CDB_SIZE; + } + memcpy(hdr->cdb, sc->cmnd, cmd_len); + + task->imm_count = 0; + if (scsi_get_prot_op(sc) != SCSI_PROT_NORMAL) + task->protected = true; + + transfer_length = scsi_transfer_length(sc); + hdr->data_length = cpu_to_be32(transfer_length); + if (sc->sc_data_direction == DMA_TO_DEVICE) { + struct iscsi_r2t_info *r2t = &task->unsol_r2t; + + hdr->flags |= ISCSI_FLAG_CMD_WRITE; + /* + * Write counters: + * + * imm_count bytes to be sent right after + * SCSI PDU Header + * + * unsol_count bytes(as Data-Out) to be sent + * without R2T ack right after + * immediate data + * + * r2t data_length bytes to be sent via R2T ack's + * + * pad_count bytes to be sent as zero-padding + */ + memset(r2t, 0, sizeof(*r2t)); + + if (session->imm_data_en) { + if (transfer_length >= session->first_burst) + task->imm_count = min(session->first_burst, + conn->max_xmit_dlength); + else + task->imm_count = min(transfer_length, + conn->max_xmit_dlength); + hton24(hdr->dlength, task->imm_count); + } else + zero_data(hdr->dlength); + + if (!session->initial_r2t_en) { + r2t->data_length = min(session->first_burst, + transfer_length) - + task->imm_count; + r2t->data_offset = task->imm_count; + r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); + r2t->exp_statsn = cpu_to_be32(conn->exp_statsn); + } + + if (!task->unsol_r2t.data_length) + /* No unsolicit Data-Out's */ + hdr->flags |= ISCSI_FLAG_CMD_FINAL; + } else { + hdr->flags |= ISCSI_FLAG_CMD_FINAL; + zero_data(hdr->dlength); + + if (sc->sc_data_direction == DMA_FROM_DEVICE) + hdr->flags |= ISCSI_FLAG_CMD_READ; + } + + /* calculate size of additional header segments (AHSs) */ + hdrlength = task->hdr_len - sizeof(*hdr); + + WARN_ON(hdrlength & (ISCSI_PAD_LEN-1)); + hdrlength /= ISCSI_PAD_LEN; + + WARN_ON(hdrlength >= 256); + hdr->hlength = hdrlength & 0xFF; + hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn); + + if (session->tt->init_task && session->tt->init_task(task)) + return -EIO; + + task->state = ISCSI_TASK_RUNNING; + session->cmdsn++; + + conn->scsicmd_pdus_cnt++; + ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x " + "itt 0x%x len %d cmdsn %d win %d]\n", + sc->sc_data_direction == DMA_TO_DEVICE ? + "write" : "read", conn->id, sc, sc->cmnd[0], + task->itt, transfer_length, + session->cmdsn, + session->max_cmdsn - session->exp_cmdsn + 1); + return 0; +} + +/** + * iscsi_free_task - free a task + * @task: iscsi cmd task + * + * Must be called with session back_lock. + * This function returns the scsi command to scsi-ml or cleans + * up mgmt tasks then returns the task to the pool. + */ +static void iscsi_free_task(struct iscsi_task *task) +{ + struct iscsi_conn *conn = task->conn; + struct iscsi_session *session = conn->session; + struct scsi_cmnd *sc = task->sc; + int oldstate = task->state; + + ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n", + task->itt, task->state, task->sc); + + session->tt->cleanup_task(task); + task->state = ISCSI_TASK_FREE; + task->sc = NULL; + /* + * login task is preallocated so do not free + */ + if (conn->login_task == task) + return; + + kfifo_in(&session->cmdpool.queue, (void*)&task, sizeof(void*)); + + if (sc) { + /* SCSI eh reuses commands to verify us */ + sc->SCp.ptr = NULL; + /* + * queue command may call this to free the task, so + * it will decide how to return sc to scsi-ml. + */ + if (oldstate != ISCSI_TASK_REQUEUE_SCSIQ) + sc->scsi_done(sc); + } +} + +void __iscsi_get_task(struct iscsi_task *task) +{ + refcount_inc(&task->refcount); +} +EXPORT_SYMBOL_GPL(__iscsi_get_task); + +void __iscsi_put_task(struct iscsi_task *task) +{ + if (refcount_dec_and_test(&task->refcount)) + iscsi_free_task(task); +} +EXPORT_SYMBOL_GPL(__iscsi_put_task); + +void iscsi_put_task(struct iscsi_task *task) +{ + struct iscsi_session *session = task->conn->session; + + /* regular RX path uses back_lock */ + spin_lock_bh(&session->back_lock); + __iscsi_put_task(task); + spin_unlock_bh(&session->back_lock); +} +EXPORT_SYMBOL_GPL(iscsi_put_task); + +/** + * iscsi_complete_task - finish a task + * @task: iscsi cmd task + * @state: state to complete task with + * + * Must be called with session back_lock. + */ +static void iscsi_complete_task(struct iscsi_task *task, int state) +{ + struct iscsi_conn *conn = task->conn; + + ISCSI_DBG_SESSION(conn->session, + "complete task itt 0x%x state %d sc %p\n", + task->itt, task->state, task->sc); + if (task->state == ISCSI_TASK_COMPLETED || + task->state == ISCSI_TASK_ABRT_TMF || + task->state == ISCSI_TASK_ABRT_SESS_RECOV || + task->state == ISCSI_TASK_REQUEUE_SCSIQ) + return; + WARN_ON_ONCE(task->state == ISCSI_TASK_FREE); + task->state = state; + + spin_lock_bh(&conn->taskqueuelock); + if (!list_empty(&task->running)) { + pr_debug_once("%s while task on list", __func__); + list_del_init(&task->running); + } + spin_unlock_bh(&conn->taskqueuelock); + + if (conn->task == task) + conn->task = NULL; + + if (READ_ONCE(conn->ping_task) == task) + WRITE_ONCE(conn->ping_task, NULL); + + /* release get from queueing */ + __iscsi_put_task(task); +} + +/** + * iscsi_complete_scsi_task - finish scsi task normally + * @task: iscsi task for scsi cmd + * @exp_cmdsn: expected cmd sn in cpu format + * @max_cmdsn: max cmd sn in cpu format + * + * This is used when drivers do not need or cannot perform + * lower level pdu processing. + * + * Called with session back_lock + */ +void iscsi_complete_scsi_task(struct iscsi_task *task, + uint32_t exp_cmdsn, uint32_t max_cmdsn) +{ + struct iscsi_conn *conn = task->conn; + + ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt); + + conn->last_recv = jiffies; + __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn); + iscsi_complete_task(task, ISCSI_TASK_COMPLETED); +} +EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task); + + +/* + * session back_lock must be held and if not called for a task that is + * still pending or from the xmit thread, then xmit thread must + * be suspended. + */ +static void fail_scsi_task(struct iscsi_task *task, int err) +{ + struct iscsi_conn *conn = task->conn; + struct scsi_cmnd *sc; + int state; + + /* + * if a command completes and we get a successful tmf response + * we will hit this because the scsi eh abort code does not take + * a ref to the task. + */ + sc = task->sc; + if (!sc) + return; + + if (task->state == ISCSI_TASK_PENDING) { + /* + * cmd never made it to the xmit thread, so we should not count + * the cmd in the sequencing + */ + conn->session->queued_cmdsn--; + /* it was never sent so just complete like normal */ + state = ISCSI_TASK_COMPLETED; + } else if (err == DID_TRANSPORT_DISRUPTED) + state = ISCSI_TASK_ABRT_SESS_RECOV; + else + state = ISCSI_TASK_ABRT_TMF; + + sc->result = err << 16; + scsi_set_resid(sc, scsi_bufflen(sc)); + + /* regular RX path uses back_lock */ + spin_lock_bh(&conn->session->back_lock); + iscsi_complete_task(task, state); + spin_unlock_bh(&conn->session->back_lock); +} + +static int iscsi_prep_mgmt_task(struct iscsi_conn *conn, + struct iscsi_task *task) +{ + struct iscsi_session *session = conn->session; + struct iscsi_hdr *hdr = task->hdr; + struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; + uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK; + + if (conn->session->state == ISCSI_STATE_LOGGING_OUT) + return -ENOTCONN; + + if (opcode != ISCSI_OP_LOGIN && opcode != ISCSI_OP_TEXT) + nop->exp_statsn = cpu_to_be32(conn->exp_statsn); + /* + * pre-format CmdSN for outgoing PDU. + */ + nop->cmdsn = cpu_to_be32(session->cmdsn); + if (hdr->itt != RESERVED_ITT) { + /* + * TODO: We always use immediate for normal session pdus. + * If we start to send tmfs or nops as non-immediate then + * we should start checking the cmdsn numbers for mgmt tasks. + * + * During discovery sessions iscsid sends TEXT as non immediate, + * but we always only send one PDU at a time. + */ + if (conn->c_stage == ISCSI_CONN_STARTED && + !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { + session->queued_cmdsn++; + session->cmdsn++; + } + } + + if (session->tt->init_task && session->tt->init_task(task)) + return -EIO; + + if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) + session->state = ISCSI_STATE_LOGGING_OUT; + + task->state = ISCSI_TASK_RUNNING; + ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x " + "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK, + hdr->itt, task->data_count); + return 0; +} + +static struct iscsi_task * +__iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, + char *data, uint32_t data_size) +{ + struct iscsi_session *session = conn->session; + struct iscsi_host *ihost = shost_priv(session->host); + uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK; + struct iscsi_task *task; + itt_t itt; + + if (session->state == ISCSI_STATE_TERMINATE) + return NULL; + + if (opcode == ISCSI_OP_LOGIN || opcode == ISCSI_OP_TEXT) { + /* + * Login and Text are sent serially, in + * request-followed-by-response sequence. + * Same task can be used. Same ITT must be used. + * Note that login_task is preallocated at conn_create(). + */ + if (conn->login_task->state != ISCSI_TASK_FREE) { + iscsi_conn_printk(KERN_ERR, conn, "Login/Text in " + "progress. Cannot start new task.\n"); + return NULL; + } + + if (data_size > ISCSI_DEF_MAX_RECV_SEG_LEN) { + iscsi_conn_printk(KERN_ERR, conn, "Invalid buffer len of %u for login task. Max len is %u\n", data_size, ISCSI_DEF_MAX_RECV_SEG_LEN); + return NULL; + } + + task = conn->login_task; + } else { + if (session->state != ISCSI_STATE_LOGGED_IN) + return NULL; + + if (data_size != 0) { + iscsi_conn_printk(KERN_ERR, conn, "Can not send data buffer of len %u for op 0x%x\n", data_size, opcode); + return NULL; + } + + BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); + BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); + + if (!kfifo_out(&session->cmdpool.queue, + (void*)&task, sizeof(void*))) + return NULL; + } + /* + * released in complete pdu for task we expect a response for, and + * released by the lld when it has transmitted the task for + * pdus we do not expect a response for. + */ + refcount_set(&task->refcount, 1); + task->conn = conn; + task->sc = NULL; + INIT_LIST_HEAD(&task->running); + task->state = ISCSI_TASK_PENDING; + + if (data_size) { + memcpy(task->data, data, data_size); + task->data_count = data_size; + } else + task->data_count = 0; + + if (conn->session->tt->alloc_pdu) { + if (conn->session->tt->alloc_pdu(task, hdr->opcode)) { + iscsi_conn_printk(KERN_ERR, conn, "Could not allocate " + "pdu for mgmt task.\n"); + goto free_task; + } + } + + itt = task->hdr->itt; + task->hdr_len = sizeof(struct iscsi_hdr); + memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr)); + + if (hdr->itt != RESERVED_ITT) { + if (session->tt->parse_pdu_itt) + task->hdr->itt = itt; + else + task->hdr->itt = build_itt(task->itt, + task->conn->session->age); + } + + if (unlikely(READ_ONCE(conn->ping_task) == INVALID_SCSI_TASK)) + WRITE_ONCE(conn->ping_task, task); + + if (!ihost->workq) { + if (iscsi_prep_mgmt_task(conn, task)) + goto free_task; + + if (session->tt->xmit_task(task)) + goto free_task; + } else { + spin_lock_bh(&conn->taskqueuelock); + list_add_tail(&task->running, &conn->mgmtqueue); + spin_unlock_bh(&conn->taskqueuelock); + iscsi_conn_queue_work(conn); + } + + return task; + +free_task: + /* regular RX path uses back_lock */ + spin_lock(&session->back_lock); + __iscsi_put_task(task); + spin_unlock(&session->back_lock); + return NULL; +} + +int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, + char *data, uint32_t data_size) +{ + struct iscsi_conn *conn = cls_conn->dd_data; + struct iscsi_session *session = conn->session; + int err = 0; + + spin_lock_bh(&session->frwd_lock); + if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size)) + err = -EPERM; + spin_unlock_bh(&session->frwd_lock); + return err; +} +EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); + +/** + * iscsi_cmd_rsp - SCSI Command Response processing + * @conn: iscsi connection + * @hdr: iscsi header + * @task: scsi command task + * @data: cmd data buffer + * @datalen: len of buffer + * + * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and + * then completes the command and task. called under back_lock + **/ +static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, + struct iscsi_task *task, char *data, + int datalen) +{ + struct iscsi_scsi_rsp *rhdr = (struct iscsi_scsi_rsp *)hdr; + struct iscsi_session *session = conn->session; + struct scsi_cmnd *sc = task->sc; + + iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); + conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; + + sc->result = (DID_OK << 16) | rhdr->cmd_status; + + if (task->protected) { + sector_t sector; + u8 ascq; + + /** + * Transports that didn't implement check_protection + * callback but still published T10-PI support to scsi-mid + * deserve this BUG_ON. + **/ + BUG_ON(!session->tt->check_protection); + + ascq = session->tt->check_protection(task, §or); + if (ascq) { + sc->result = DRIVER_SENSE << 24 | + SAM_STAT_CHECK_CONDITION; + scsi_build_sense_buffer(1, sc->sense_buffer, + ILLEGAL_REQUEST, 0x10, ascq); + scsi_set_sense_information(sc->sense_buffer, + SCSI_SENSE_BUFFERSIZE, + sector); + goto out; + } + } + + if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { + sc->result = DID_ERROR << 16; + goto out; + } + + if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) { + uint16_t senselen; + + if (datalen < 2) { +invalid_datalen: + iscsi_conn_printk(KERN_ERR, conn, + "Got CHECK_CONDITION but invalid data " + "buffer size of %d\n", datalen); + sc->result = DID_BAD_TARGET << 16; + goto out; + } + + senselen = get_unaligned_be16(data); + if (datalen < senselen) + goto invalid_datalen; + + memcpy(sc->sense_buffer, data + 2, + min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); + ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n", + min_t(uint16_t, senselen, + SCSI_SENSE_BUFFERSIZE)); + } + + if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW | + ISCSI_FLAG_CMD_BIDI_OVERFLOW)) { + sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; + } + + if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW | + ISCSI_FLAG_CMD_OVERFLOW)) { + int res_count = be32_to_cpu(rhdr->residual_count); + + if (res_count > 0 && + (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || + res_count <= scsi_bufflen(sc))) + /* write side for bidi or uni-io set_resid */ + scsi_set_resid(sc, res_count); + else + sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; + } +out: + ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n", + sc, sc->result, task->itt); + conn->scsirsp_pdus_cnt++; + iscsi_complete_task(task, ISCSI_TASK_COMPLETED); +} + +/** + * iscsi_data_in_rsp - SCSI Data-In Response processing + * @conn: iscsi connection + * @hdr: iscsi pdu + * @task: scsi command task + * + * iscsi_data_in_rsp sets up the scsi_cmnd fields based on the data received + * then completes the command and task. called under back_lock + **/ +static void +iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, + struct iscsi_task *task) +{ + struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr; + struct scsi_cmnd *sc = task->sc; + + if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS)) + return; + + iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr); + sc->result = (DID_OK << 16) | rhdr->cmd_status; + conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; + if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW | + ISCSI_FLAG_DATA_OVERFLOW)) { + int res_count = be32_to_cpu(rhdr->residual_count); + + if (res_count > 0 && + (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || + res_count <= sc->sdb.length)) + scsi_set_resid(sc, res_count); + else + sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; + } + + ISCSI_DBG_SESSION(conn->session, "data in with status done " + "[sc %p res %d itt 0x%x]\n", + sc, sc->result, task->itt); + conn->scsirsp_pdus_cnt++; + iscsi_complete_task(task, ISCSI_TASK_COMPLETED); +} + +static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) +{ + struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr; + struct iscsi_session *session = conn->session; + + conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; + conn->tmfrsp_pdus_cnt++; + + if (session->tmf_state != TMF_QUEUED) + return; + + if (tmf->response == ISCSI_TMF_RSP_COMPLETE) + session->tmf_state = TMF_SUCCESS; + else if (tmf->response == ISCSI_TMF_RSP_NO_TASK) + session->tmf_state = TMF_NOT_FOUND; + else + session->tmf_state = TMF_FAILED; + wake_up(&session->ehwait); +} + +static int iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr) +{ + struct iscsi_nopout hdr; + struct iscsi_task *task; + + if (!rhdr) { + if (READ_ONCE(conn->ping_task)) + return -EINVAL; + WRITE_ONCE(conn->ping_task, INVALID_SCSI_TASK); + } + + memset(&hdr, 0, sizeof(struct iscsi_nopout)); + hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE; + hdr.flags = ISCSI_FLAG_CMD_FINAL; + + if (rhdr) { + hdr.lun = rhdr->lun; + hdr.ttt = rhdr->ttt; + hdr.itt = RESERVED_ITT; + } else + hdr.ttt = RESERVED_ITT; + + task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0); + if (!task) { + if (!rhdr) + WRITE_ONCE(conn->ping_task, NULL); + iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n"); + return -EIO; + } else if (!rhdr) { + /* only track our nops */ + conn->last_ping = jiffies; + } + + return 0; +} + +/** + * iscsi_nop_out_rsp - SCSI NOP Response processing + * @task: scsi command task + * @nop: the nop structure + * @data: where to put the data + * @datalen: length of data + * + * iscsi_nop_out_rsp handles nop response from use or + * from user space. called under back_lock + **/ +static int iscsi_nop_out_rsp(struct iscsi_task *task, + struct iscsi_nopin *nop, char *data, int datalen) +{ + struct iscsi_conn *conn = task->conn; + int rc = 0; + + if (READ_ONCE(conn->ping_task) != task) { + /* + * If this is not in response to one of our + * nops then it must be from userspace. + */ + if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop, + data, datalen)) + rc = ISCSI_ERR_CONN_FAILED; + } else + mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout); + iscsi_complete_task(task, ISCSI_TASK_COMPLETED); + return rc; +} + +static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr, + char *data, int datalen) +{ + struct iscsi_reject *reject = (struct iscsi_reject *)hdr; + struct iscsi_hdr rejected_pdu; + int opcode, rc = 0; + + conn->exp_statsn = be32_to_cpu(reject->statsn) + 1; + + if (ntoh24(reject->dlength) > datalen || + ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) { + iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected " + "pdu. Invalid data length (pdu dlength " + "%u, datalen %d\n", ntoh24(reject->dlength), + datalen); + return ISCSI_ERR_PROTO; + } + memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr)); + opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK; + + switch (reject->reason) { + case ISCSI_REASON_DATA_DIGEST_ERROR: + iscsi_conn_printk(KERN_ERR, conn, + "pdu (op 0x%x itt 0x%x) rejected " + "due to DataDigest error.\n", + opcode, rejected_pdu.itt); + break; + case ISCSI_REASON_IMM_CMD_REJECT: + iscsi_conn_printk(KERN_ERR, conn, + "pdu (op 0x%x itt 0x%x) rejected. Too many " + "immediate commands.\n", + opcode, rejected_pdu.itt); + /* + * We only send one TMF at a time so if the target could not + * handle it, then it should get fixed (RFC mandates that + * a target can handle one immediate TMF per conn). + * + * For nops-outs, we could have sent more than one if + * the target is sending us lots of nop-ins + */ + if (opcode != ISCSI_OP_NOOP_OUT) + return 0; + + if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG)) { + /* + * nop-out in response to target's nop-out rejected. + * Just resend. + */ + /* In RX path we are under back lock */ + spin_unlock(&conn->session->back_lock); + spin_lock(&conn->session->frwd_lock); + iscsi_send_nopout(conn, + (struct iscsi_nopin*)&rejected_pdu); + spin_unlock(&conn->session->frwd_lock); + spin_lock(&conn->session->back_lock); + } else { + struct iscsi_task *task; + /* + * Our nop as ping got dropped. We know the target + * and transport are ok so just clean up + */ + task = iscsi_itt_to_task(conn, rejected_pdu.itt); + if (!task) { + iscsi_conn_printk(KERN_ERR, conn, + "Invalid pdu reject. Could " + "not lookup rejected task.\n"); + rc = ISCSI_ERR_BAD_ITT; + } else + rc = iscsi_nop_out_rsp(task, + (struct iscsi_nopin*)&rejected_pdu, + NULL, 0); + } + break; + default: + iscsi_conn_printk(KERN_ERR, conn, + "pdu (op 0x%x itt 0x%x) rejected. Reason " + "code 0x%x\n", rejected_pdu.opcode, + rejected_pdu.itt, reject->reason); + break; + } + return rc; +} + +/** + * iscsi_itt_to_task - look up task by itt + * @conn: iscsi connection + * @itt: itt + * + * This should be used for mgmt tasks like login and nops, or if + * the LDD's itt space does not include the session age. + * + * The session back_lock must be held. + */ +struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt) +{ + struct iscsi_session *session = conn->session; + int i; + + if (itt == RESERVED_ITT) + return NULL; + + if (session->tt->parse_pdu_itt) + session->tt->parse_pdu_itt(conn, itt, &i, NULL); + else + i = get_itt(itt); + if (i >= session->cmds_max) + return NULL; + + return session->cmds[i]; +} +EXPORT_SYMBOL_GPL(iscsi_itt_to_task); + +/** + * __iscsi_complete_pdu - complete pdu + * @conn: iscsi conn + * @hdr: iscsi header + * @data: data buffer + * @datalen: len of data buffer + * + * Completes pdu processing by freeing any resources allocated at + * queuecommand or send generic. session back_lock must be held and verify + * itt must have been called. + */ +int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, + char *data, int datalen) +{ + struct iscsi_session *session = conn->session; + int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0; + struct iscsi_task *task; + uint32_t itt; + + conn->last_recv = jiffies; + rc = iscsi_verify_itt(conn, hdr->itt); + if (rc) + return rc; + + if (hdr->itt != RESERVED_ITT) + itt = get_itt(hdr->itt); + else + itt = ~0U; + + ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n", + opcode, conn->id, itt, datalen); + + if (itt == ~0U) { + iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); + + switch(opcode) { + case ISCSI_OP_NOOP_IN: + if (datalen) { + rc = ISCSI_ERR_PROTO; + break; + } + + if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG)) + break; + + /* In RX path we are under back lock */ + spin_unlock(&session->back_lock); + spin_lock(&session->frwd_lock); + iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr); + spin_unlock(&session->frwd_lock); + spin_lock(&session->back_lock); + break; + case ISCSI_OP_REJECT: + rc = iscsi_handle_reject(conn, hdr, data, datalen); + break; + case ISCSI_OP_ASYNC_EVENT: + conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; + if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) + rc = ISCSI_ERR_CONN_FAILED; + break; + default: + rc = ISCSI_ERR_BAD_OPCODE; + break; + } + goto out; + } + + switch(opcode) { + case ISCSI_OP_SCSI_CMD_RSP: + case ISCSI_OP_SCSI_DATA_IN: + task = iscsi_itt_to_ctask(conn, hdr->itt); + if (!task) + return ISCSI_ERR_BAD_ITT; + task->last_xfer = jiffies; + break; + case ISCSI_OP_R2T: + /* + * LLD handles R2Ts if they need to. + */ + return 0; + case ISCSI_OP_LOGOUT_RSP: + case ISCSI_OP_LOGIN_RSP: + case ISCSI_OP_TEXT_RSP: + case ISCSI_OP_SCSI_TMFUNC_RSP: + case ISCSI_OP_NOOP_IN: + task = iscsi_itt_to_task(conn, hdr->itt); + if (!task) + return ISCSI_ERR_BAD_ITT; + break; + default: + return ISCSI_ERR_BAD_OPCODE; + } + + switch(opcode) { + case ISCSI_OP_SCSI_CMD_RSP: + iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen); + break; + case ISCSI_OP_SCSI_DATA_IN: + iscsi_data_in_rsp(conn, hdr, task); + break; + case ISCSI_OP_LOGOUT_RSP: + iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); + if (datalen) { + rc = ISCSI_ERR_PROTO; + break; + } + conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; + goto recv_pdu; + case ISCSI_OP_LOGIN_RSP: + case ISCSI_OP_TEXT_RSP: + iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); + /* + * login related PDU's exp_statsn is handled in + * userspace + */ + goto recv_pdu; + case ISCSI_OP_SCSI_TMFUNC_RSP: + iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); + if (datalen) { + rc = ISCSI_ERR_PROTO; + break; + } + + iscsi_tmf_rsp(conn, hdr); + iscsi_complete_task(task, ISCSI_TASK_COMPLETED); + break; + case ISCSI_OP_NOOP_IN: + iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); + if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) { + rc = ISCSI_ERR_PROTO; + break; + } + conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; + + rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr, + data, datalen); + break; + default: + rc = ISCSI_ERR_BAD_OPCODE; + break; + } + +out: + return rc; +recv_pdu: + if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) + rc = ISCSI_ERR_CONN_FAILED; + iscsi_complete_task(task, ISCSI_TASK_COMPLETED); + return rc; +} +EXPORT_SYMBOL_GPL(__iscsi_complete_pdu); + +int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, + char *data, int datalen) +{ + int rc; + + spin_lock(&conn->session->back_lock); + rc = __iscsi_complete_pdu(conn, hdr, data, datalen); + spin_unlock(&conn->session->back_lock); + return rc; +} +EXPORT_SYMBOL_GPL(iscsi_complete_pdu); + +int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt) +{ + struct iscsi_session *session = conn->session; + int age = 0, i = 0; + + if (itt == RESERVED_ITT) + return 0; + + if (session->tt->parse_pdu_itt) + session->tt->parse_pdu_itt(conn, itt, &i, &age); + else { + i = get_itt(itt); + age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK; + } + + if (age != session->age) { + iscsi_conn_printk(KERN_ERR, conn, + "received itt %x expected session age (%x)\n", + (__force u32)itt, session->age); + return ISCSI_ERR_BAD_ITT; + } + + if (i >= session->cmds_max) { + iscsi_conn_printk(KERN_ERR, conn, + "received invalid itt index %u (max cmds " + "%u.\n", i, session->cmds_max); + return ISCSI_ERR_BAD_ITT; + } + return 0; +} +EXPORT_SYMBOL_GPL(iscsi_verify_itt); + +/** + * iscsi_itt_to_ctask - look up ctask by itt + * @conn: iscsi connection + * @itt: itt + * + * This should be used for cmd tasks. + * + * The session back_lock must be held. + */ +struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt) +{ + struct iscsi_task *task; + + if (iscsi_verify_itt(conn, itt)) + return NULL; + + task = iscsi_itt_to_task(conn, itt); + if (!task || !task->sc) + return NULL; + + if (task->sc->SCp.phase != conn->session->age) { + iscsi_session_printk(KERN_ERR, conn->session, + "task's session age %d, expected %d\n", + task->sc->SCp.phase, conn->session->age); + return NULL; + } + + return task; +} +EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask); + +void iscsi_session_failure(struct iscsi_session *session, + enum iscsi_err err) +{ + struct iscsi_conn *conn; + + spin_lock_bh(&session->frwd_lock); + conn = session->leadconn; + if (session->state == ISCSI_STATE_TERMINATE || !conn) { + spin_unlock_bh(&session->frwd_lock); + return; + } + + iscsi_get_conn(conn->cls_conn); + spin_unlock_bh(&session->frwd_lock); + /* + * if the host is being removed bypass the connection + * recovery initialization because we are going to kill + * the session. + */ + if (err == ISCSI_ERR_INVALID_HOST) + iscsi_conn_error_event(conn->cls_conn, err); + else + iscsi_conn_failure(conn, err); + iscsi_put_conn(conn->cls_conn); +} +EXPORT_SYMBOL_GPL(iscsi_session_failure); + +static bool iscsi_set_conn_failed(struct iscsi_conn *conn) +{ + struct iscsi_session *session = conn->session; + + if (session->state == ISCSI_STATE_FAILED) + return false; + + if (conn->stop_stage == 0) + session->state = ISCSI_STATE_FAILED; + + set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); + set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); + return true; +} + +void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) +{ + struct iscsi_session *session = conn->session; + bool needs_evt; + + spin_lock_bh(&session->frwd_lock); + needs_evt = iscsi_set_conn_failed(conn); + spin_unlock_bh(&session->frwd_lock); + + if (needs_evt) + iscsi_conn_error_event(conn->cls_conn, err); +} +EXPORT_SYMBOL_GPL(iscsi_conn_failure); + +static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn) +{ + struct iscsi_session *session = conn->session; + + /* + * Check for iSCSI window and take care of CmdSN wrap-around + */ + if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) { + ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn " + "%u MaxCmdSN %u CmdSN %u/%u\n", + session->exp_cmdsn, session->max_cmdsn, + session->cmdsn, session->queued_cmdsn); + return -ENOSPC; + } + return 0; +} + +static int iscsi_xmit_task(struct iscsi_conn *conn) +{ + struct iscsi_task *task = conn->task; + int rc; + + if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) + return -ENODATA; + + spin_lock_bh(&conn->session->back_lock); + if (conn->task == NULL) { + spin_unlock_bh(&conn->session->back_lock); + return -ENODATA; + } + __iscsi_get_task(task); + spin_unlock_bh(&conn->session->back_lock); + spin_unlock_bh(&conn->session->frwd_lock); + rc = conn->session->tt->xmit_task(task); + spin_lock_bh(&conn->session->frwd_lock); + if (!rc) { + /* done with this task */ + task->last_xfer = jiffies; + conn->task = NULL; + } + /* regular RX path uses back_lock */ + spin_lock(&conn->session->back_lock); + __iscsi_put_task(task); + spin_unlock(&conn->session->back_lock); + return rc; +} + +/** + * iscsi_requeue_task - requeue task to run from session workqueue + * @task: task to requeue + * + * LLDs that need to run a task from the session workqueue should call + * this. The session frwd_lock must be held. This should only be called + * by software drivers. + */ +void iscsi_requeue_task(struct iscsi_task *task) +{ + struct iscsi_conn *conn = task->conn; + + /* + * this may be on the requeue list already if the xmit_task callout + * is handling the r2ts while we are adding new ones + */ + spin_lock_bh(&conn->taskqueuelock); + if (list_empty(&task->running)) + list_add_tail(&task->running, &conn->requeue); + spin_unlock_bh(&conn->taskqueuelock); + iscsi_conn_queue_work(conn); +} +EXPORT_SYMBOL_GPL(iscsi_requeue_task); + +/** + * iscsi_data_xmit - xmit any command into the scheduled connection + * @conn: iscsi connection + * + * Notes: + * The function can return -EAGAIN in which case the caller must + * re-schedule it again later or recover. '0' return code means + * successful xmit. + **/ +static int iscsi_data_xmit(struct iscsi_conn *conn) +{ + struct iscsi_task *task; + int rc = 0; + + spin_lock_bh(&conn->session->frwd_lock); + if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) { + ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n"); + spin_unlock_bh(&conn->session->frwd_lock); + return -ENODATA; + } + + if (conn->task) { + rc = iscsi_xmit_task(conn); + if (rc) + goto done; + } + + /* + * process mgmt pdus like nops before commands since we should + * only have one nop-out as a ping from us and targets should not + * overflow us with nop-ins + */ + spin_lock_bh(&conn->taskqueuelock); +check_mgmt: + while (!list_empty(&conn->mgmtqueue)) { + conn->task = list_entry(conn->mgmtqueue.next, + struct iscsi_task, running); + list_del_init(&conn->task->running); + spin_unlock_bh(&conn->taskqueuelock); + if (iscsi_prep_mgmt_task(conn, conn->task)) { + /* regular RX path uses back_lock */ + spin_lock_bh(&conn->session->back_lock); + __iscsi_put_task(conn->task); + spin_unlock_bh(&conn->session->back_lock); + conn->task = NULL; + spin_lock_bh(&conn->taskqueuelock); + continue; + } + rc = iscsi_xmit_task(conn); + if (rc) + goto done; + spin_lock_bh(&conn->taskqueuelock); + } + + /* process pending command queue */ + while (!list_empty(&conn->cmdqueue)) { + conn->task = list_entry(conn->cmdqueue.next, struct iscsi_task, + running); + list_del_init(&conn->task->running); + spin_unlock_bh(&conn->taskqueuelock); + if (conn->session->state == ISCSI_STATE_LOGGING_OUT) { + fail_scsi_task(conn->task, DID_IMM_RETRY); + spin_lock_bh(&conn->taskqueuelock); + continue; + } + rc = iscsi_prep_scsi_cmd_pdu(conn->task); + if (rc) { + if (rc == -ENOMEM || rc == -EACCES) + fail_scsi_task(conn->task, DID_IMM_RETRY); + else + fail_scsi_task(conn->task, DID_ABORT); + spin_lock_bh(&conn->taskqueuelock); + continue; + } + rc = iscsi_xmit_task(conn); + if (rc) + goto done; + /* + * we could continuously get new task requests so + * we need to check the mgmt queue for nops that need to + * be sent to aviod starvation + */ + spin_lock_bh(&conn->taskqueuelock); + if (!list_empty(&conn->mgmtqueue)) + goto check_mgmt; + } + + while (!list_empty(&conn->requeue)) { + /* + * we always do fastlogout - conn stop code will clean up. + */ + if (conn->session->state == ISCSI_STATE_LOGGING_OUT) + break; + + task = list_entry(conn->requeue.next, struct iscsi_task, + running); + if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT)) + break; + + conn->task = task; + list_del_init(&conn->task->running); + conn->task->state = ISCSI_TASK_RUNNING; + spin_unlock_bh(&conn->taskqueuelock); + rc = iscsi_xmit_task(conn); + if (rc) + goto done; + spin_lock_bh(&conn->taskqueuelock); + if (!list_empty(&conn->mgmtqueue)) + goto check_mgmt; + } + spin_unlock_bh(&conn->taskqueuelock); + spin_unlock_bh(&conn->session->frwd_lock); + return -ENODATA; + +done: + spin_unlock_bh(&conn->session->frwd_lock); + return rc; +} + +static void iscsi_xmitworker(struct work_struct *work) +{ + struct iscsi_conn *conn = + container_of(work, struct iscsi_conn, xmitwork); + int rc; + /* + * serialize Xmit worker on a per-connection basis. + */ + do { + rc = iscsi_data_xmit(conn); + } while (rc >= 0 || rc == -EAGAIN); +} + +static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn, + struct scsi_cmnd *sc) +{ + struct iscsi_task *task; + + if (!kfifo_out(&conn->session->cmdpool.queue, + (void *) &task, sizeof(void *))) + return NULL; + + sc->SCp.phase = conn->session->age; + sc->SCp.ptr = (char *) task; + + refcount_set(&task->refcount, 1); + task->state = ISCSI_TASK_PENDING; + task->conn = conn; + task->sc = sc; + task->have_checked_conn = false; + task->last_timeout = jiffies; + task->last_xfer = jiffies; + task->protected = false; + INIT_LIST_HEAD(&task->running); + return task; +} + +enum { + FAILURE_BAD_HOST = 1, + FAILURE_SESSION_FAILED, + FAILURE_SESSION_FREED, + FAILURE_WINDOW_CLOSED, + FAILURE_OOM, + FAILURE_SESSION_TERMINATE, + FAILURE_SESSION_IN_RECOVERY, + FAILURE_SESSION_RECOVERY_TIMEOUT, + FAILURE_SESSION_LOGGING_OUT, + FAILURE_SESSION_NOT_READY, +}; + +int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc) +{ + struct iscsi_cls_session *cls_session; + struct iscsi_host *ihost; + int reason = 0; + struct iscsi_session *session; + struct iscsi_conn *conn; + struct iscsi_task *task = NULL; + + sc->result = 0; + sc->SCp.ptr = NULL; + + ihost = shost_priv(host); + + cls_session = starget_to_session(scsi_target(sc->device)); + session = cls_session->dd_data; + spin_lock_bh(&session->frwd_lock); + + reason = iscsi_session_chkready(cls_session); + if (reason) { + sc->result = reason; + goto fault; + } + + if (session->state != ISCSI_STATE_LOGGED_IN) { + /* + * to handle the race between when we set the recovery state + * and block the session we requeue here (commands could + * be entering our queuecommand while a block is starting + * up because the block code is not locked) + */ + switch (session->state) { + case ISCSI_STATE_FAILED: + /* + * cmds should fail during shutdown, if the session + * state is bad, allowing completion to happen + */ + if (unlikely(system_state != SYSTEM_RUNNING)) { + reason = FAILURE_SESSION_FAILED; + sc->result = DID_NO_CONNECT << 16; + break; + } + fallthrough; + case ISCSI_STATE_IN_RECOVERY: + reason = FAILURE_SESSION_IN_RECOVERY; + sc->result = DID_IMM_RETRY << 16; + break; + case ISCSI_STATE_LOGGING_OUT: + reason = FAILURE_SESSION_LOGGING_OUT; + sc->result = DID_IMM_RETRY << 16; + break; + case ISCSI_STATE_RECOVERY_FAILED: + reason = FAILURE_SESSION_RECOVERY_TIMEOUT; + sc->result = DID_TRANSPORT_FAILFAST << 16; + break; + case ISCSI_STATE_TERMINATE: + reason = FAILURE_SESSION_TERMINATE; + sc->result = DID_NO_CONNECT << 16; + break; + default: + reason = FAILURE_SESSION_FREED; + sc->result = DID_NO_CONNECT << 16; + } + goto fault; + } + + conn = session->leadconn; + if (!conn) { + reason = FAILURE_SESSION_FREED; + sc->result = DID_NO_CONNECT << 16; + goto fault; + } + + if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) { + reason = FAILURE_SESSION_IN_RECOVERY; + sc->result = DID_REQUEUE << 16; + goto fault; + } + + if (iscsi_check_cmdsn_window_closed(conn)) { + reason = FAILURE_WINDOW_CLOSED; + goto reject; + } + + task = iscsi_alloc_task(conn, sc); + if (!task) { + reason = FAILURE_OOM; + goto reject; + } + + if (!ihost->workq) { + reason = iscsi_prep_scsi_cmd_pdu(task); + if (reason) { + if (reason == -ENOMEM || reason == -EACCES) { + reason = FAILURE_OOM; + goto prepd_reject; + } else { + sc->result = DID_ABORT << 16; + goto prepd_fault; + } + } + if (session->tt->xmit_task(task)) { + session->cmdsn--; + reason = FAILURE_SESSION_NOT_READY; + goto prepd_reject; + } + } else { + spin_lock_bh(&conn->taskqueuelock); + list_add_tail(&task->running, &conn->cmdqueue); + spin_unlock_bh(&conn->taskqueuelock); + iscsi_conn_queue_work(conn); + } + + session->queued_cmdsn++; + spin_unlock_bh(&session->frwd_lock); + return 0; + +prepd_reject: + spin_lock_bh(&session->back_lock); + iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ); + spin_unlock_bh(&session->back_lock); +reject: + spin_unlock_bh(&session->frwd_lock); + ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n", + sc->cmnd[0], reason); + return SCSI_MLQUEUE_TARGET_BUSY; + +prepd_fault: + spin_lock_bh(&session->back_lock); + iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ); + spin_unlock_bh(&session->back_lock); +fault: + spin_unlock_bh(&session->frwd_lock); + ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n", + sc->cmnd[0], reason); + scsi_set_resid(sc, scsi_bufflen(sc)); + sc->scsi_done(sc); + return 0; +} +EXPORT_SYMBOL_GPL(iscsi_queuecommand); + +int iscsi_target_alloc(struct scsi_target *starget) +{ + struct iscsi_cls_session *cls_session = starget_to_session(starget); + struct iscsi_session *session = cls_session->dd_data; + + starget->can_queue = session->scsi_cmds_max; + return 0; +} +EXPORT_SYMBOL_GPL(iscsi_target_alloc); + +static void iscsi_tmf_timedout(struct timer_list *t) +{ + struct iscsi_session *session = from_timer(session, t, tmf_timer); + + spin_lock(&session->frwd_lock); + if (session->tmf_state == TMF_QUEUED) { + session->tmf_state = TMF_TIMEDOUT; + ISCSI_DBG_EH(session, "tmf timedout\n"); + /* unblock eh_abort() */ + wake_up(&session->ehwait); + } + spin_unlock(&session->frwd_lock); +} + +static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn, + struct iscsi_tm *hdr, int age, + int timeout) + __must_hold(&session->frwd_lock) +{ + struct iscsi_session *session = conn->session; + struct iscsi_task *task; + + task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr, + NULL, 0); + if (!task) { + spin_unlock_bh(&session->frwd_lock); + iscsi_conn_printk(KERN_ERR, conn, "Could not send TMF.\n"); + iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); + spin_lock_bh(&session->frwd_lock); + return -EPERM; + } + conn->tmfcmd_pdus_cnt++; + session->tmf_timer.expires = timeout * HZ + jiffies; + add_timer(&session->tmf_timer); + ISCSI_DBG_EH(session, "tmf set timeout\n"); + + spin_unlock_bh(&session->frwd_lock); + mutex_unlock(&session->eh_mutex); + + /* + * block eh thread until: + * + * 1) tmf response + * 2) tmf timeout + * 3) session is terminated or restarted or userspace has + * given up on recovery + */ + wait_event_interruptible(session->ehwait, age != session->age || + session->state != ISCSI_STATE_LOGGED_IN || + session->tmf_state != TMF_QUEUED); + if (signal_pending(current)) + flush_signals(current); + del_timer_sync(&session->tmf_timer); + + mutex_lock(&session->eh_mutex); + spin_lock_bh(&session->frwd_lock); + /* if the session drops it will clean up the task */ + if (age != session->age || + session->state != ISCSI_STATE_LOGGED_IN) + return -ENOTCONN; + return 0; +} + +/* + * Fail commands. session lock held and recv side suspended and xmit + * thread flushed + */ +static void fail_scsi_tasks(struct iscsi_conn *conn, u64 lun, int error) +{ + struct iscsi_task *task; + int i; + + for (i = 0; i < conn->session->cmds_max; i++) { + task = conn->session->cmds[i]; + if (!task->sc || task->state == ISCSI_TASK_FREE) + continue; + + if (lun != -1 && lun != task->sc->device->lun) + continue; + + ISCSI_DBG_SESSION(conn->session, + "failing sc %p itt 0x%x state %d\n", + task->sc, task->itt, task->state); + fail_scsi_task(task, error); + } +} + +/** + * iscsi_suspend_queue - suspend iscsi_queuecommand + * @conn: iscsi conn to stop queueing IO on + * + * This grabs the session frwd_lock to make sure no one is in + * xmit_task/queuecommand, and then sets suspend to prevent + * new commands from being queued. This only needs to be called + * by offload drivers that need to sync a path like ep disconnect + * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi + * will call iscsi_start_tx and iscsi_unblock_session when in FFP. + */ +void iscsi_suspend_queue(struct iscsi_conn *conn) +{ + spin_lock_bh(&conn->session->frwd_lock); + set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); + spin_unlock_bh(&conn->session->frwd_lock); +} +EXPORT_SYMBOL_GPL(iscsi_suspend_queue); + +/** + * iscsi_suspend_tx - suspend iscsi_data_xmit + * @conn: iscsi conn tp stop processing IO on. + * + * This function sets the suspend bit to prevent iscsi_data_xmit + * from sending new IO, and if work is queued on the xmit thread + * it will wait for it to be completed. + */ +void iscsi_suspend_tx(struct iscsi_conn *conn) +{ + struct Scsi_Host *shost = conn->session->host; + struct iscsi_host *ihost = shost_priv(shost); + + set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); + if (ihost->workq) + flush_workqueue(ihost->workq); +} +EXPORT_SYMBOL_GPL(iscsi_suspend_tx); + +static void iscsi_start_tx(struct iscsi_conn *conn) +{ + clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); + iscsi_conn_queue_work(conn); +} + +/* + * We want to make sure a ping is in flight. It has timed out. + * And we are not busy processing a pdu that is making + * progress but got started before the ping and is taking a while + * to complete so the ping is just stuck behind it in a queue. + */ +static int iscsi_has_ping_timed_out(struct iscsi_conn *conn) +{ + if (READ_ONCE(conn->ping_task) && + time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) + + (conn->ping_timeout * HZ), jiffies)) + return 1; + else + return 0; +} + +enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc) +{ + enum blk_eh_timer_return rc = BLK_EH_DONE; + struct iscsi_task *task = NULL, *running_task; + struct iscsi_cls_session *cls_session; + struct iscsi_session *session; + struct iscsi_conn *conn; + int i; + + cls_session = starget_to_session(scsi_target(sc->device)); + session = cls_session->dd_data; + + ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc); + + spin_lock_bh(&session->frwd_lock); + task = (struct iscsi_task *)sc->SCp.ptr; + if (!task) { + /* + * Raced with completion. Blk layer has taken ownership + * so let timeout code complete it now. + */ + rc = BLK_EH_DONE; + goto done; + } + + if (session->state != ISCSI_STATE_LOGGED_IN) { + /* + * During shutdown, if session is prematurely disconnected, + * recovery won't happen and there will be hung cmds. Not + * handling cmds would trigger EH, also bad in this case. + * Instead, handle cmd, allow completion to happen and let + * upper layer to deal with the result. + */ + if (unlikely(system_state != SYSTEM_RUNNING)) { + sc->result = DID_NO_CONNECT << 16; + ISCSI_DBG_EH(session, "sc on shutdown, handled\n"); + rc = BLK_EH_DONE; + goto done; + } + /* + * We are probably in the middle of iscsi recovery so let + * that complete and handle the error. + */ + rc = BLK_EH_RESET_TIMER; + goto done; + } + + conn = session->leadconn; + if (!conn) { + /* In the middle of shuting down */ + rc = BLK_EH_RESET_TIMER; + goto done; + } + + /* + * If we have sent (at least queued to the network layer) a pdu or + * recvd one for the task since the last timeout ask for + * more time. If on the next timeout we have not made progress + * we can check if it is the task or connection when we send the + * nop as a ping. + */ + if (time_after(task->last_xfer, task->last_timeout)) { + ISCSI_DBG_EH(session, "Command making progress. Asking " + "scsi-ml for more time to complete. " + "Last data xfer at %lu. Last timeout was at " + "%lu\n.", task->last_xfer, task->last_timeout); + task->have_checked_conn = false; + rc = BLK_EH_RESET_TIMER; + goto done; + } + + if (!conn->recv_timeout && !conn->ping_timeout) + goto done; + /* + * if the ping timedout then we are in the middle of cleaning up + * and can let the iscsi eh handle it + */ + if (iscsi_has_ping_timed_out(conn)) { + rc = BLK_EH_RESET_TIMER; + goto done; + } + + for (i = 0; i < conn->session->cmds_max; i++) { + running_task = conn->session->cmds[i]; + if (!running_task->sc || running_task == task || + running_task->state != ISCSI_TASK_RUNNING) + continue; + + /* + * Only check if cmds started before this one have made + * progress, or this could never fail + */ + if (time_after(running_task->sc->jiffies_at_alloc, + task->sc->jiffies_at_alloc)) + continue; + + if (time_after(running_task->last_xfer, task->last_timeout)) { + /* + * This task has not made progress, but a task + * started before us has transferred data since + * we started/last-checked. We could be queueing + * too many tasks or the LU is bad. + * + * If the device is bad the cmds ahead of us on + * other devs will complete, and this loop will + * eventually fail starting the scsi eh. + */ + ISCSI_DBG_EH(session, "Command has not made progress " + "but commands ahead of it have. " + "Asking scsi-ml for more time to " + "complete. Our last xfer vs running task " + "last xfer %lu/%lu. Last check %lu.\n", + task->last_xfer, running_task->last_xfer, + task->last_timeout); + rc = BLK_EH_RESET_TIMER; + goto done; + } + } + + /* Assumes nop timeout is shorter than scsi cmd timeout */ + if (task->have_checked_conn) + goto done; + + /* + * Checking the transport already or nop from a cmd timeout still + * running + */ + if (READ_ONCE(conn->ping_task)) { + task->have_checked_conn = true; + rc = BLK_EH_RESET_TIMER; + goto done; + } + + /* Make sure there is a transport check done */ + iscsi_send_nopout(conn, NULL); + task->have_checked_conn = true; + rc = BLK_EH_RESET_TIMER; + +done: + if (task) + task->last_timeout = jiffies; + spin_unlock_bh(&session->frwd_lock); + ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ? + "timer reset" : "shutdown or nh"); + return rc; +} +EXPORT_SYMBOL_GPL(iscsi_eh_cmd_timed_out); + +static void iscsi_check_transport_timeouts(struct timer_list *t) +{ + struct iscsi_conn *conn = from_timer(conn, t, transport_timer); + struct iscsi_session *session = conn->session; + unsigned long recv_timeout, next_timeout = 0, last_recv; + + spin_lock(&session->frwd_lock); + if (session->state != ISCSI_STATE_LOGGED_IN) + goto done; + + recv_timeout = conn->recv_timeout; + if (!recv_timeout) + goto done; + + recv_timeout *= HZ; + last_recv = conn->last_recv; + + if (iscsi_has_ping_timed_out(conn)) { + iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs " + "expired, recv timeout %d, last rx %lu, " + "last ping %lu, now %lu\n", + conn->ping_timeout, conn->recv_timeout, + last_recv, conn->last_ping, jiffies); + spin_unlock(&session->frwd_lock); + iscsi_conn_failure(conn, ISCSI_ERR_NOP_TIMEDOUT); + return; + } + + if (time_before_eq(last_recv + recv_timeout, jiffies)) { + /* send a ping to try to provoke some traffic */ + ISCSI_DBG_CONN(conn, "Sending nopout as ping\n"); + if (iscsi_send_nopout(conn, NULL)) + next_timeout = jiffies + (1 * HZ); + else + next_timeout = conn->last_ping + (conn->ping_timeout * HZ); + } else + next_timeout = last_recv + recv_timeout; + + ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout); + mod_timer(&conn->transport_timer, next_timeout); +done: + spin_unlock(&session->frwd_lock); +} + +/** + * iscsi_conn_unbind - prevent queueing to conn. + * @cls_conn: iscsi conn ep is bound to. + * @is_active: is the conn in use for boot or is this for EH/termination + * + * This must be called by drivers implementing the ep_disconnect callout. + * It disables queueing to the connection from libiscsi in preparation for + * an ep_disconnect call. + */ +void iscsi_conn_unbind(struct iscsi_cls_conn *cls_conn, bool is_active) +{ + struct iscsi_session *session; + struct iscsi_conn *conn; + + if (!cls_conn) + return; + + conn = cls_conn->dd_data; + session = conn->session; + /* + * Wait for iscsi_eh calls to exit. We don't wait for the tmf to + * complete or timeout. The caller just wants to know what's running + * is everything that needs to be cleaned up, and no cmds will be + * queued. + */ + mutex_lock(&session->eh_mutex); + + iscsi_suspend_queue(conn); + iscsi_suspend_tx(conn); + + spin_lock_bh(&session->frwd_lock); + if (!is_active) { + /* + * if logout timed out before userspace could even send a PDU + * the state might still be in ISCSI_STATE_LOGGED_IN and + * allowing new cmds and TMFs. + */ + if (session->state == ISCSI_STATE_LOGGED_IN) + iscsi_set_conn_failed(conn); + } + spin_unlock_bh(&session->frwd_lock); + mutex_unlock(&session->eh_mutex); +} +EXPORT_SYMBOL_GPL(iscsi_conn_unbind); + +static void iscsi_prep_abort_task_pdu(struct iscsi_task *task, + struct iscsi_tm *hdr) +{ + memset(hdr, 0, sizeof(*hdr)); + hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; + hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK; + hdr->flags |= ISCSI_FLAG_CMD_FINAL; + hdr->lun = task->lun; + hdr->rtt = task->hdr_itt; + hdr->refcmdsn = task->cmdsn; +} + +int iscsi_eh_abort(struct scsi_cmnd *sc) +{ + struct iscsi_cls_session *cls_session; + struct iscsi_session *session; + struct iscsi_conn *conn; + struct iscsi_task *task; + struct iscsi_tm *hdr; + int age; + + cls_session = starget_to_session(scsi_target(sc->device)); + session = cls_session->dd_data; + + ISCSI_DBG_EH(session, "aborting sc %p\n", sc); + + mutex_lock(&session->eh_mutex); + spin_lock_bh(&session->frwd_lock); + /* + * if session was ISCSI_STATE_IN_RECOVERY then we may not have + * got the command. + */ + if (!sc->SCp.ptr) { + ISCSI_DBG_EH(session, "sc never reached iscsi layer or " + "it completed.\n"); + spin_unlock_bh(&session->frwd_lock); + mutex_unlock(&session->eh_mutex); + return SUCCESS; + } + + /* + * If we are not logged in or we have started a new session + * then let the host reset code handle this + */ + if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN || + sc->SCp.phase != session->age) { + spin_unlock_bh(&session->frwd_lock); + mutex_unlock(&session->eh_mutex); + ISCSI_DBG_EH(session, "failing abort due to dropped " + "session.\n"); + return FAILED; + } + + conn = session->leadconn; + conn->eh_abort_cnt++; + age = session->age; + + task = (struct iscsi_task *)sc->SCp.ptr; + ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n", + sc, task->itt); + + /* task completed before time out */ + if (!task->sc) { + ISCSI_DBG_EH(session, "sc completed while abort in progress\n"); + goto success; + } + + if (task->state == ISCSI_TASK_PENDING) { + fail_scsi_task(task, DID_ABORT); + goto success; + } + + /* only have one tmf outstanding at a time */ + if (session->tmf_state != TMF_INITIAL) + goto failed; + session->tmf_state = TMF_QUEUED; + + hdr = &session->tmhdr; + iscsi_prep_abort_task_pdu(task, hdr); + + if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) + goto failed; + + switch (session->tmf_state) { + case TMF_SUCCESS: + spin_unlock_bh(&session->frwd_lock); + /* + * stop tx side incase the target had sent a abort rsp but + * the initiator was still writing out data. + */ + iscsi_suspend_tx(conn); + /* + * we do not stop the recv side because targets have been + * good and have never sent us a successful tmf response + * then sent more data for the cmd. + */ + spin_lock_bh(&session->frwd_lock); + fail_scsi_task(task, DID_ABORT); + session->tmf_state = TMF_INITIAL; + memset(hdr, 0, sizeof(*hdr)); + spin_unlock_bh(&session->frwd_lock); + iscsi_start_tx(conn); + goto success_unlocked; + case TMF_TIMEDOUT: + spin_unlock_bh(&session->frwd_lock); + iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); + goto failed_unlocked; + case TMF_NOT_FOUND: + if (!sc->SCp.ptr) { + session->tmf_state = TMF_INITIAL; + memset(hdr, 0, sizeof(*hdr)); + /* task completed before tmf abort response */ + ISCSI_DBG_EH(session, "sc completed while abort in " + "progress\n"); + goto success; + } + fallthrough; + default: + session->tmf_state = TMF_INITIAL; + goto failed; + } + +success: + spin_unlock_bh(&session->frwd_lock); +success_unlocked: + ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n", + sc, task->itt); + mutex_unlock(&session->eh_mutex); + return SUCCESS; + +failed: + spin_unlock_bh(&session->frwd_lock); +failed_unlocked: + ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc, + task ? task->itt : 0); + mutex_unlock(&session->eh_mutex); + return FAILED; +} +EXPORT_SYMBOL_GPL(iscsi_eh_abort); + +static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) +{ + memset(hdr, 0, sizeof(*hdr)); + hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; + hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK; + hdr->flags |= ISCSI_FLAG_CMD_FINAL; + int_to_scsilun(sc->device->lun, &hdr->lun); + hdr->rtt = RESERVED_ITT; +} + +int iscsi_eh_device_reset(struct scsi_cmnd *sc) +{ + struct iscsi_cls_session *cls_session; + struct iscsi_session *session; + struct iscsi_conn *conn; + struct iscsi_tm *hdr; + int rc = FAILED; + + cls_session = starget_to_session(scsi_target(sc->device)); + session = cls_session->dd_data; + + ISCSI_DBG_EH(session, "LU Reset [sc %p lun %llu]\n", sc, + sc->device->lun); + + mutex_lock(&session->eh_mutex); + spin_lock_bh(&session->frwd_lock); + /* + * Just check if we are not logged in. We cannot check for + * the phase because the reset could come from a ioctl. + */ + if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) + goto unlock; + conn = session->leadconn; + + /* only have one tmf outstanding at a time */ + if (session->tmf_state != TMF_INITIAL) + goto unlock; + session->tmf_state = TMF_QUEUED; + + hdr = &session->tmhdr; + iscsi_prep_lun_reset_pdu(sc, hdr); + + if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, + session->lu_reset_timeout)) { + rc = FAILED; + goto unlock; + } + + switch (session->tmf_state) { + case TMF_SUCCESS: + break; + case TMF_TIMEDOUT: + spin_unlock_bh(&session->frwd_lock); + iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); + goto done; + default: + session->tmf_state = TMF_INITIAL; + goto unlock; + } + + rc = SUCCESS; + spin_unlock_bh(&session->frwd_lock); + + iscsi_suspend_tx(conn); + + spin_lock_bh(&session->frwd_lock); + memset(hdr, 0, sizeof(*hdr)); + fail_scsi_tasks(conn, sc->device->lun, DID_ERROR); + session->tmf_state = TMF_INITIAL; + spin_unlock_bh(&session->frwd_lock); + + iscsi_start_tx(conn); + goto done; + +unlock: + spin_unlock_bh(&session->frwd_lock); +done: + ISCSI_DBG_EH(session, "dev reset result = %s\n", + rc == SUCCESS ? "SUCCESS" : "FAILED"); + mutex_unlock(&session->eh_mutex); + return rc; +} +EXPORT_SYMBOL_GPL(iscsi_eh_device_reset); + +void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session) +{ + struct iscsi_session *session = cls_session->dd_data; + + spin_lock_bh(&session->frwd_lock); + if (session->state != ISCSI_STATE_LOGGED_IN) { + session->state = ISCSI_STATE_RECOVERY_FAILED; + wake_up(&session->ehwait); + } + spin_unlock_bh(&session->frwd_lock); +} +EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout); + +/** + * iscsi_eh_session_reset - drop session and attempt relogin + * @sc: scsi command + * + * This function will wait for a relogin, session termination from + * userspace, or a recovery/replacement timeout. + */ +int iscsi_eh_session_reset(struct scsi_cmnd *sc) +{ + struct iscsi_cls_session *cls_session; + struct iscsi_session *session; + struct iscsi_conn *conn; + + cls_session = starget_to_session(scsi_target(sc->device)); + session = cls_session->dd_data; + conn = session->leadconn; + + mutex_lock(&session->eh_mutex); + spin_lock_bh(&session->frwd_lock); + if (session->state == ISCSI_STATE_TERMINATE) { +failed: + ISCSI_DBG_EH(session, + "failing session reset: Could not log back into " + "%s [age %d]\n", session->targetname, + session->age); + spin_unlock_bh(&session->frwd_lock); + mutex_unlock(&session->eh_mutex); + return FAILED; + } + + spin_unlock_bh(&session->frwd_lock); + mutex_unlock(&session->eh_mutex); + /* + * we drop the lock here but the leadconn cannot be destoyed while + * we are in the scsi eh + */ + iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); + + ISCSI_DBG_EH(session, "wait for relogin\n"); + wait_event_interruptible(session->ehwait, + session->state == ISCSI_STATE_TERMINATE || + session->state == ISCSI_STATE_LOGGED_IN || + session->state == ISCSI_STATE_RECOVERY_FAILED); + if (signal_pending(current)) + flush_signals(current); + + mutex_lock(&session->eh_mutex); + spin_lock_bh(&session->frwd_lock); + if (session->state == ISCSI_STATE_LOGGED_IN) { + ISCSI_DBG_EH(session, + "session reset succeeded for %s,%s\n", + session->targetname, conn->persistent_address); + } else + goto failed; + spin_unlock_bh(&session->frwd_lock); + mutex_unlock(&session->eh_mutex); + return SUCCESS; +} +EXPORT_SYMBOL_GPL(iscsi_eh_session_reset); + +static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) +{ + memset(hdr, 0, sizeof(*hdr)); + hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; + hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK; + hdr->flags |= ISCSI_FLAG_CMD_FINAL; + hdr->rtt = RESERVED_ITT; +} + +/** + * iscsi_eh_target_reset - reset target + * @sc: scsi command + * + * This will attempt to send a warm target reset. + */ +static int iscsi_eh_target_reset(struct scsi_cmnd *sc) +{ + struct iscsi_cls_session *cls_session; + struct iscsi_session *session; + struct iscsi_conn *conn; + struct iscsi_tm *hdr; + int rc = FAILED; + + cls_session = starget_to_session(scsi_target(sc->device)); + session = cls_session->dd_data; + + ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc, + session->targetname); + + mutex_lock(&session->eh_mutex); + spin_lock_bh(&session->frwd_lock); + /* + * Just check if we are not logged in. We cannot check for + * the phase because the reset could come from a ioctl. + */ + if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) + goto unlock; + conn = session->leadconn; + + /* only have one tmf outstanding at a time */ + if (session->tmf_state != TMF_INITIAL) + goto unlock; + session->tmf_state = TMF_QUEUED; + + hdr = &session->tmhdr; + iscsi_prep_tgt_reset_pdu(sc, hdr); + + if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, + session->tgt_reset_timeout)) { + rc = FAILED; + goto unlock; + } + + switch (session->tmf_state) { + case TMF_SUCCESS: + break; + case TMF_TIMEDOUT: + spin_unlock_bh(&session->frwd_lock); + iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); + goto done; + default: + session->tmf_state = TMF_INITIAL; + goto unlock; + } + + rc = SUCCESS; + spin_unlock_bh(&session->frwd_lock); + + iscsi_suspend_tx(conn); + + spin_lock_bh(&session->frwd_lock); + memset(hdr, 0, sizeof(*hdr)); + fail_scsi_tasks(conn, -1, DID_ERROR); + session->tmf_state = TMF_INITIAL; + spin_unlock_bh(&session->frwd_lock); + + iscsi_start_tx(conn); + goto done; + +unlock: + spin_unlock_bh(&session->frwd_lock); +done: + ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname, + rc == SUCCESS ? "SUCCESS" : "FAILED"); + mutex_unlock(&session->eh_mutex); + return rc; +} + +/** + * iscsi_eh_recover_target - reset target and possibly the session + * @sc: scsi command + * + * This will attempt to send a warm target reset. If that fails, + * we will escalate to ERL0 session recovery. + */ +int iscsi_eh_recover_target(struct scsi_cmnd *sc) +{ + int rc; + + rc = iscsi_eh_target_reset(sc); + if (rc == FAILED) + rc = iscsi_eh_session_reset(sc); + return rc; +} +EXPORT_SYMBOL_GPL(iscsi_eh_recover_target); + +/* + * Pre-allocate a pool of @max items of @item_size. By default, the pool + * should be accessed via kfifo_{get,put} on q->queue. + * Optionally, the caller can obtain the array of object pointers + * by passing in a non-NULL @items pointer + */ +int +iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size) +{ + int i, num_arrays = 1; + + memset(q, 0, sizeof(*q)); + + q->max = max; + + /* If the user passed an items pointer, he wants a copy of + * the array. */ + if (items) + num_arrays++; + q->pool = kvcalloc(num_arrays * max, sizeof(void *), GFP_KERNEL); + if (q->pool == NULL) + return -ENOMEM; + + kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*)); + + for (i = 0; i < max; i++) { + q->pool[i] = kzalloc(item_size, GFP_KERNEL); + if (q->pool[i] == NULL) { + q->max = i; + goto enomem; + } + kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*)); + } + + if (items) { + *items = q->pool + max; + memcpy(*items, q->pool, max * sizeof(void *)); + } + + return 0; + +enomem: + iscsi_pool_free(q); + return -ENOMEM; +} +EXPORT_SYMBOL_GPL(iscsi_pool_init); + +void iscsi_pool_free(struct iscsi_pool *q) +{ + int i; + + for (i = 0; i < q->max; i++) + kfree(q->pool[i]); + kvfree(q->pool); +} +EXPORT_SYMBOL_GPL(iscsi_pool_free); + +/** + * iscsi_host_add - add host to system + * @shost: scsi host + * @pdev: parent device + * + * This should be called by partial offload and software iscsi drivers + * to add a host to the system. + */ +int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev) +{ + if (!shost->can_queue) + shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX; + + if (!shost->cmd_per_lun) + shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN; + + return scsi_add_host(shost, pdev); +} +EXPORT_SYMBOL_GPL(iscsi_host_add); + +/** + * iscsi_host_alloc - allocate a host and driver data + * @sht: scsi host template + * @dd_data_size: driver host data size + * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue + * + * This should be called by partial offload and software iscsi drivers. + * To access the driver specific memory use the iscsi_host_priv() macro. + */ +struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht, + int dd_data_size, bool xmit_can_sleep) +{ + struct Scsi_Host *shost; + struct iscsi_host *ihost; + + shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size); + if (!shost) + return NULL; + ihost = shost_priv(shost); + + if (xmit_can_sleep) { + snprintf(ihost->workq_name, sizeof(ihost->workq_name), + "iscsi_q_%d", shost->host_no); + ihost->workq = alloc_workqueue("%s", + WQ_SYSFS | __WQ_LEGACY | WQ_MEM_RECLAIM | WQ_UNBOUND, + 1, ihost->workq_name); + if (!ihost->workq) + goto free_host; + } + + spin_lock_init(&ihost->lock); + ihost->state = ISCSI_HOST_SETUP; + ihost->num_sessions = 0; + init_waitqueue_head(&ihost->session_removal_wq); + return shost; + +free_host: + scsi_host_put(shost); + return NULL; +} +EXPORT_SYMBOL_GPL(iscsi_host_alloc); + +static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session) +{ + iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST); +} + +/** + * iscsi_host_remove - remove host and sessions + * @shost: scsi host + * + * If there are any sessions left, this will initiate the removal and wait + * for the completion. + */ +void iscsi_host_remove(struct Scsi_Host *shost) +{ + struct iscsi_host *ihost = shost_priv(shost); + unsigned long flags; + + spin_lock_irqsave(&ihost->lock, flags); + ihost->state = ISCSI_HOST_REMOVED; + spin_unlock_irqrestore(&ihost->lock, flags); + + iscsi_host_for_each_session(shost, iscsi_notify_host_removed); + wait_event_interruptible(ihost->session_removal_wq, + ihost->num_sessions == 0); + if (signal_pending(current)) + flush_signals(current); + + scsi_remove_host(shost); + if (ihost->workq) + destroy_workqueue(ihost->workq); +} +EXPORT_SYMBOL_GPL(iscsi_host_remove); + +void iscsi_host_free(struct Scsi_Host *shost) +{ + struct iscsi_host *ihost = shost_priv(shost); + + kfree(ihost->netdev); + kfree(ihost->hwaddress); + kfree(ihost->initiatorname); + scsi_host_put(shost); +} +EXPORT_SYMBOL_GPL(iscsi_host_free); + +static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost) +{ + struct iscsi_host *ihost = shost_priv(shost); + unsigned long flags; + + shost = scsi_host_get(shost); + if (!shost) { + printk(KERN_ERR "Invalid state. Cannot notify host removal " + "of session teardown event because host already " + "removed.\n"); + return; + } + + spin_lock_irqsave(&ihost->lock, flags); + ihost->num_sessions--; + if (ihost->num_sessions == 0) + wake_up(&ihost->session_removal_wq); + spin_unlock_irqrestore(&ihost->lock, flags); + scsi_host_put(shost); +} + +/** + * iscsi_session_setup - create iscsi cls session and host and session + * @iscsit: iscsi transport template + * @shost: scsi host + * @cmds_max: session can queue + * @dd_size: private driver data size, added to session allocation size + * @cmd_task_size: LLD task private data size + * @initial_cmdsn: initial CmdSN + * @id: target ID to add to this session + * + * This can be used by software iscsi_transports that allocate + * a session per scsi host. + * + * Callers should set cmds_max to the largest total numer (mgmt + scsi) of + * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks + * for nop handling and login/logout requests. + */ +struct iscsi_cls_session * +iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost, + uint16_t cmds_max, int dd_size, int cmd_task_size, + uint32_t initial_cmdsn, unsigned int id) +{ + struct iscsi_host *ihost = shost_priv(shost); + struct iscsi_session *session; + struct iscsi_cls_session *cls_session; + int cmd_i, scsi_cmds, total_cmds = cmds_max; + unsigned long flags; + + spin_lock_irqsave(&ihost->lock, flags); + if (ihost->state == ISCSI_HOST_REMOVED) { + spin_unlock_irqrestore(&ihost->lock, flags); + return NULL; + } + ihost->num_sessions++; + spin_unlock_irqrestore(&ihost->lock, flags); + + if (!total_cmds) + total_cmds = ISCSI_DEF_XMIT_CMDS_MAX; + /* + * The iscsi layer needs some tasks for nop handling and tmfs, + * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX + * + 1 command for scsi IO. + */ + if (total_cmds < ISCSI_TOTAL_CMDS_MIN) { + printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " + "must be a power of two that is at least %d.\n", + total_cmds, ISCSI_TOTAL_CMDS_MIN); + goto dec_session_count; + } + + if (total_cmds > ISCSI_TOTAL_CMDS_MAX) { + printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " + "must be a power of 2 less than or equal to %d.\n", + cmds_max, ISCSI_TOTAL_CMDS_MAX); + total_cmds = ISCSI_TOTAL_CMDS_MAX; + } + + if (!is_power_of_2(total_cmds)) { + printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " + "must be a power of 2.\n", total_cmds); + total_cmds = rounddown_pow_of_two(total_cmds); + if (total_cmds < ISCSI_TOTAL_CMDS_MIN) + goto dec_session_count; + printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n", + total_cmds); + } + scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX; + + cls_session = iscsi_alloc_session(shost, iscsit, + sizeof(struct iscsi_session) + + dd_size); + if (!cls_session) + goto dec_session_count; + session = cls_session->dd_data; + session->cls_session = cls_session; + session->host = shost; + session->state = ISCSI_STATE_FREE; + session->fast_abort = 1; + session->tgt_reset_timeout = 30; + session->lu_reset_timeout = 15; + session->abort_timeout = 10; + session->scsi_cmds_max = scsi_cmds; + session->cmds_max = total_cmds; + session->queued_cmdsn = session->cmdsn = initial_cmdsn; + session->exp_cmdsn = initial_cmdsn + 1; + session->max_cmdsn = initial_cmdsn + 1; + session->max_r2t = 1; + session->tt = iscsit; + session->dd_data = cls_session->dd_data + sizeof(*session); + + session->tmf_state = TMF_INITIAL; + timer_setup(&session->tmf_timer, iscsi_tmf_timedout, 0); + mutex_init(&session->eh_mutex); + + spin_lock_init(&session->frwd_lock); + spin_lock_init(&session->back_lock); + + /* initialize SCSI PDU commands pool */ + if (iscsi_pool_init(&session->cmdpool, session->cmds_max, + (void***)&session->cmds, + cmd_task_size + sizeof(struct iscsi_task))) + goto cmdpool_alloc_fail; + + /* pre-format cmds pool with ITT */ + for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { + struct iscsi_task *task = session->cmds[cmd_i]; + + if (cmd_task_size) + task->dd_data = &task[1]; + task->itt = cmd_i; + task->state = ISCSI_TASK_FREE; + INIT_LIST_HEAD(&task->running); + } + + if (!try_module_get(iscsit->owner)) + goto module_get_fail; + + if (iscsi_add_session(cls_session, id)) + goto cls_session_fail; + + return cls_session; + +cls_session_fail: + module_put(iscsit->owner); +module_get_fail: + iscsi_pool_free(&session->cmdpool); +cmdpool_alloc_fail: + iscsi_free_session(cls_session); +dec_session_count: + iscsi_host_dec_session_cnt(shost); + return NULL; +} +EXPORT_SYMBOL_GPL(iscsi_session_setup); + +/** + * iscsi_session_teardown - destroy session, host, and cls_session + * @cls_session: iscsi session + */ +void iscsi_session_teardown(struct iscsi_cls_session *cls_session) +{ + struct iscsi_session *session = cls_session->dd_data; + struct module *owner = cls_session->transport->owner; + struct Scsi_Host *shost = session->host; + + iscsi_pool_free(&session->cmdpool); + + iscsi_remove_session(cls_session); + + kfree(session->password); + kfree(session->password_in); + kfree(session->username); + kfree(session->username_in); + kfree(session->targetname); + kfree(session->targetalias); + kfree(session->initiatorname); + kfree(session->boot_root); + kfree(session->boot_nic); + kfree(session->boot_target); + kfree(session->ifacename); + kfree(session->portal_type); + kfree(session->discovery_parent_type); + + iscsi_free_session(cls_session); + + iscsi_host_dec_session_cnt(shost); + module_put(owner); +} +EXPORT_SYMBOL_GPL(iscsi_session_teardown); + +/** + * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn + * @cls_session: iscsi_cls_session + * @dd_size: private driver data size + * @conn_idx: cid + */ +struct iscsi_cls_conn * +iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size, + uint32_t conn_idx) +{ + struct iscsi_session *session = cls_session->dd_data; + struct iscsi_conn *conn; + struct iscsi_cls_conn *cls_conn; + char *data; + + cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size, + conn_idx); + if (!cls_conn) + return NULL; + conn = cls_conn->dd_data; + memset(conn, 0, sizeof(*conn) + dd_size); + + conn->dd_data = cls_conn->dd_data + sizeof(*conn); + conn->session = session; + conn->cls_conn = cls_conn; + conn->c_stage = ISCSI_CONN_INITIAL_STAGE; + conn->id = conn_idx; + conn->exp_statsn = 0; + + timer_setup(&conn->transport_timer, iscsi_check_transport_timeouts, 0); + + INIT_LIST_HEAD(&conn->mgmtqueue); + INIT_LIST_HEAD(&conn->cmdqueue); + INIT_LIST_HEAD(&conn->requeue); + spin_lock_init(&conn->taskqueuelock); + INIT_WORK(&conn->xmitwork, iscsi_xmitworker); + + /* allocate login_task used for the login/text sequences */ + spin_lock_bh(&session->frwd_lock); + if (!kfifo_out(&session->cmdpool.queue, + (void*)&conn->login_task, + sizeof(void*))) { + spin_unlock_bh(&session->frwd_lock); + goto login_task_alloc_fail; + } + spin_unlock_bh(&session->frwd_lock); + + data = (char *) __get_free_pages(GFP_KERNEL, + get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); + if (!data) + goto login_task_data_alloc_fail; + conn->login_task->data = conn->data = data; + + init_waitqueue_head(&session->ehwait); + + return cls_conn; + +login_task_data_alloc_fail: + kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task, + sizeof(void*)); +login_task_alloc_fail: + iscsi_destroy_conn(cls_conn); + return NULL; +} +EXPORT_SYMBOL_GPL(iscsi_conn_setup); + +/** + * iscsi_conn_teardown - teardown iscsi connection + * @cls_conn: iscsi class connection + * + * TODO: we may need to make this into a two step process + * like scsi-mls remove + put host + */ +void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) +{ + struct iscsi_conn *conn = cls_conn->dd_data; + struct iscsi_session *session = conn->session; + char *tmp_persistent_address = conn->persistent_address; + char *tmp_local_ipaddr = conn->local_ipaddr; + + del_timer_sync(&conn->transport_timer); + + mutex_lock(&session->eh_mutex); + spin_lock_bh(&session->frwd_lock); + conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; + if (session->leadconn == conn) { + /* + * leading connection? then give up on recovery. + */ + session->state = ISCSI_STATE_TERMINATE; + wake_up(&session->ehwait); + } + spin_unlock_bh(&session->frwd_lock); + + /* flush queued up work because we free the connection below */ + iscsi_suspend_tx(conn); + + spin_lock_bh(&session->frwd_lock); + free_pages((unsigned long) conn->data, + get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); + /* regular RX path uses back_lock */ + spin_lock_bh(&session->back_lock); + kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task, + sizeof(void*)); + spin_unlock_bh(&session->back_lock); + if (session->leadconn == conn) + session->leadconn = NULL; + spin_unlock_bh(&session->frwd_lock); + mutex_unlock(&session->eh_mutex); + + iscsi_destroy_conn(cls_conn); + kfree(tmp_persistent_address); + kfree(tmp_local_ipaddr); +} +EXPORT_SYMBOL_GPL(iscsi_conn_teardown); + +int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) +{ + struct iscsi_conn *conn = cls_conn->dd_data; + struct iscsi_session *session = conn->session; + + if (!session) { + iscsi_conn_printk(KERN_ERR, conn, + "can't start unbound connection\n"); + return -EPERM; + } + + if ((session->imm_data_en || !session->initial_r2t_en) && + session->first_burst > session->max_burst) { + iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: " + "first_burst %d max_burst %d\n", + session->first_burst, session->max_burst); + return -EINVAL; + } + + if (conn->ping_timeout && !conn->recv_timeout) { + iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of " + "zero. Using 5 seconds\n."); + conn->recv_timeout = 5; + } + + if (conn->recv_timeout && !conn->ping_timeout) { + iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of " + "zero. Using 5 seconds.\n"); + conn->ping_timeout = 5; + } + + spin_lock_bh(&session->frwd_lock); + conn->c_stage = ISCSI_CONN_STARTED; + session->state = ISCSI_STATE_LOGGED_IN; + session->queued_cmdsn = session->cmdsn; + + conn->last_recv = jiffies; + conn->last_ping = jiffies; + if (conn->recv_timeout && conn->ping_timeout) + mod_timer(&conn->transport_timer, + jiffies + (conn->recv_timeout * HZ)); + + switch(conn->stop_stage) { + case STOP_CONN_RECOVER: + /* + * unblock eh_abort() if it is blocked. re-try all + * commands after successful recovery + */ + conn->stop_stage = 0; + session->tmf_state = TMF_INITIAL; + session->age++; + if (session->age == 16) + session->age = 0; + break; + case STOP_CONN_TERM: + conn->stop_stage = 0; + break; + default: + break; + } + spin_unlock_bh(&session->frwd_lock); + + iscsi_unblock_session(session->cls_session); + wake_up(&session->ehwait); + return 0; +} +EXPORT_SYMBOL_GPL(iscsi_conn_start); + +static void +fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn) +{ + struct iscsi_task *task; + int i, state; + + for (i = 0; i < conn->session->cmds_max; i++) { + task = conn->session->cmds[i]; + if (task->sc) + continue; + + if (task->state == ISCSI_TASK_FREE) + continue; + + ISCSI_DBG_SESSION(conn->session, + "failing mgmt itt 0x%x state %d\n", + task->itt, task->state); + state = ISCSI_TASK_ABRT_SESS_RECOV; + if (task->state == ISCSI_TASK_PENDING) + state = ISCSI_TASK_COMPLETED; + spin_lock_bh(&session->back_lock); + iscsi_complete_task(task, state); + spin_unlock_bh(&session->back_lock); + } +} + +void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) +{ + struct iscsi_conn *conn = cls_conn->dd_data; + struct iscsi_session *session = conn->session; + int old_stop_stage; + + mutex_lock(&session->eh_mutex); + spin_lock_bh(&session->frwd_lock); + if (conn->stop_stage == STOP_CONN_TERM) { + spin_unlock_bh(&session->frwd_lock); + mutex_unlock(&session->eh_mutex); + return; + } + + /* + * When this is called for the in_login state, we only want to clean + * up the login task and connection. We do not need to block and set + * the recovery state again + */ + if (flag == STOP_CONN_TERM) + session->state = ISCSI_STATE_TERMINATE; + else if (conn->stop_stage != STOP_CONN_RECOVER) + session->state = ISCSI_STATE_IN_RECOVERY; + + old_stop_stage = conn->stop_stage; + conn->stop_stage = flag; + spin_unlock_bh(&session->frwd_lock); + + del_timer_sync(&conn->transport_timer); + iscsi_suspend_tx(conn); + + spin_lock_bh(&session->frwd_lock); + conn->c_stage = ISCSI_CONN_STOPPED; + spin_unlock_bh(&session->frwd_lock); + + /* + * for connection level recovery we should not calculate + * header digest. conn->hdr_size used for optimization + * in hdr_extract() and will be re-negotiated at + * set_param() time. + */ + if (flag == STOP_CONN_RECOVER) { + conn->hdrdgst_en = 0; + conn->datadgst_en = 0; + if (session->state == ISCSI_STATE_IN_RECOVERY && + old_stop_stage != STOP_CONN_RECOVER) { + ISCSI_DBG_SESSION(session, "blocking session\n"); + iscsi_block_session(session->cls_session); + } + } + + /* + * flush queues. + */ + spin_lock_bh(&session->frwd_lock); + fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED); + fail_mgmt_tasks(session, conn); + memset(&session->tmhdr, 0, sizeof(session->tmhdr)); + spin_unlock_bh(&session->frwd_lock); + mutex_unlock(&session->eh_mutex); +} +EXPORT_SYMBOL_GPL(iscsi_conn_stop); + +int iscsi_conn_bind(struct iscsi_cls_session *cls_session, + struct iscsi_cls_conn *cls_conn, int is_leading) +{ + struct iscsi_session *session = cls_session->dd_data; + struct iscsi_conn *conn = cls_conn->dd_data; + + spin_lock_bh(&session->frwd_lock); + if (is_leading) + session->leadconn = conn; + spin_unlock_bh(&session->frwd_lock); + + /* + * Unblock xmitworker(), Login Phase will pass through. + */ + clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); + clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); + return 0; +} +EXPORT_SYMBOL_GPL(iscsi_conn_bind); + +int iscsi_switch_str_param(char **param, char *new_val_buf) +{ + char *new_val; + + if (*param) { + if (!strcmp(*param, new_val_buf)) + return 0; + } + + new_val = kstrdup(new_val_buf, GFP_NOIO); + if (!new_val) + return -ENOMEM; + + kfree(*param); + *param = new_val; + return 0; +} +EXPORT_SYMBOL_GPL(iscsi_switch_str_param); + +int iscsi_set_param(struct iscsi_cls_conn *cls_conn, + enum iscsi_param param, char *buf, int buflen) +{ + struct iscsi_conn *conn = cls_conn->dd_data; + struct iscsi_session *session = conn->session; + int val; + + switch(param) { + case ISCSI_PARAM_FAST_ABORT: + sscanf(buf, "%d", &session->fast_abort); + break; + case ISCSI_PARAM_ABORT_TMO: + sscanf(buf, "%d", &session->abort_timeout); + break; + case ISCSI_PARAM_LU_RESET_TMO: + sscanf(buf, "%d", &session->lu_reset_timeout); + break; + case ISCSI_PARAM_TGT_RESET_TMO: + sscanf(buf, "%d", &session->tgt_reset_timeout); + break; + case ISCSI_PARAM_PING_TMO: + sscanf(buf, "%d", &conn->ping_timeout); + break; + case ISCSI_PARAM_RECV_TMO: + sscanf(buf, "%d", &conn->recv_timeout); + break; + case ISCSI_PARAM_MAX_RECV_DLENGTH: + sscanf(buf, "%d", &conn->max_recv_dlength); + break; + case ISCSI_PARAM_MAX_XMIT_DLENGTH: + sscanf(buf, "%d", &conn->max_xmit_dlength); + break; + case ISCSI_PARAM_HDRDGST_EN: + sscanf(buf, "%d", &conn->hdrdgst_en); + break; + case ISCSI_PARAM_DATADGST_EN: + sscanf(buf, "%d", &conn->datadgst_en); + break; + case ISCSI_PARAM_INITIAL_R2T_EN: + sscanf(buf, "%d", &session->initial_r2t_en); + break; + case ISCSI_PARAM_MAX_R2T: + sscanf(buf, "%hu", &session->max_r2t); + break; + case ISCSI_PARAM_IMM_DATA_EN: + sscanf(buf, "%d", &session->imm_data_en); + break; + case ISCSI_PARAM_FIRST_BURST: + sscanf(buf, "%d", &session->first_burst); + break; + case ISCSI_PARAM_MAX_BURST: + sscanf(buf, "%d", &session->max_burst); + break; + case ISCSI_PARAM_PDU_INORDER_EN: + sscanf(buf, "%d", &session->pdu_inorder_en); + break; + case ISCSI_PARAM_DATASEQ_INORDER_EN: + sscanf(buf, "%d", &session->dataseq_inorder_en); + break; + case ISCSI_PARAM_ERL: + sscanf(buf, "%d", &session->erl); + break; + case ISCSI_PARAM_EXP_STATSN: + sscanf(buf, "%u", &conn->exp_statsn); + break; + case ISCSI_PARAM_USERNAME: + return iscsi_switch_str_param(&session->username, buf); + case ISCSI_PARAM_USERNAME_IN: + return iscsi_switch_str_param(&session->username_in, buf); + case ISCSI_PARAM_PASSWORD: + return iscsi_switch_str_param(&session->password, buf); + case ISCSI_PARAM_PASSWORD_IN: + return iscsi_switch_str_param(&session->password_in, buf); + case ISCSI_PARAM_TARGET_NAME: + return iscsi_switch_str_param(&session->targetname, buf); + case ISCSI_PARAM_TARGET_ALIAS: + return iscsi_switch_str_param(&session->targetalias, buf); + case ISCSI_PARAM_TPGT: + sscanf(buf, "%d", &session->tpgt); + break; + case ISCSI_PARAM_PERSISTENT_PORT: + sscanf(buf, "%d", &conn->persistent_port); + break; + case ISCSI_PARAM_PERSISTENT_ADDRESS: + return iscsi_switch_str_param(&conn->persistent_address, buf); + case ISCSI_PARAM_IFACE_NAME: + return iscsi_switch_str_param(&session->ifacename, buf); + case ISCSI_PARAM_INITIATOR_NAME: + return iscsi_switch_str_param(&session->initiatorname, buf); + case ISCSI_PARAM_BOOT_ROOT: + return iscsi_switch_str_param(&session->boot_root, buf); + case ISCSI_PARAM_BOOT_NIC: + return iscsi_switch_str_param(&session->boot_nic, buf); + case ISCSI_PARAM_BOOT_TARGET: + return iscsi_switch_str_param(&session->boot_target, buf); + case ISCSI_PARAM_PORTAL_TYPE: + return iscsi_switch_str_param(&session->portal_type, buf); + case ISCSI_PARAM_DISCOVERY_PARENT_TYPE: + return iscsi_switch_str_param(&session->discovery_parent_type, + buf); + case ISCSI_PARAM_DISCOVERY_SESS: + sscanf(buf, "%d", &val); + session->discovery_sess = !!val; + break; + case ISCSI_PARAM_LOCAL_IPADDR: + return iscsi_switch_str_param(&conn->local_ipaddr, buf); + default: + return -ENOSYS; + } + + return 0; +} +EXPORT_SYMBOL_GPL(iscsi_set_param); + +int iscsi_session_get_param(struct iscsi_cls_session *cls_session, + enum iscsi_param param, char *buf) +{ + struct iscsi_session *session = cls_session->dd_data; + int len; + + switch(param) { + case ISCSI_PARAM_FAST_ABORT: + len = sysfs_emit(buf, "%d\n", session->fast_abort); + break; + case ISCSI_PARAM_ABORT_TMO: + len = sysfs_emit(buf, "%d\n", session->abort_timeout); + break; + case ISCSI_PARAM_LU_RESET_TMO: + len = sysfs_emit(buf, "%d\n", session->lu_reset_timeout); + break; + case ISCSI_PARAM_TGT_RESET_TMO: + len = sysfs_emit(buf, "%d\n", session->tgt_reset_timeout); + break; + case ISCSI_PARAM_INITIAL_R2T_EN: + len = sysfs_emit(buf, "%d\n", session->initial_r2t_en); + break; + case ISCSI_PARAM_MAX_R2T: + len = sysfs_emit(buf, "%hu\n", session->max_r2t); + break; + case ISCSI_PARAM_IMM_DATA_EN: + len = sysfs_emit(buf, "%d\n", session->imm_data_en); + break; + case ISCSI_PARAM_FIRST_BURST: + len = sysfs_emit(buf, "%u\n", session->first_burst); + break; + case ISCSI_PARAM_MAX_BURST: + len = sysfs_emit(buf, "%u\n", session->max_burst); + break; + case ISCSI_PARAM_PDU_INORDER_EN: + len = sysfs_emit(buf, "%d\n", session->pdu_inorder_en); + break; + case ISCSI_PARAM_DATASEQ_INORDER_EN: + len = sysfs_emit(buf, "%d\n", session->dataseq_inorder_en); + break; + case ISCSI_PARAM_DEF_TASKMGMT_TMO: + len = sysfs_emit(buf, "%d\n", session->def_taskmgmt_tmo); + break; + case ISCSI_PARAM_ERL: + len = sysfs_emit(buf, "%d\n", session->erl); + break; + case ISCSI_PARAM_TARGET_NAME: + len = sysfs_emit(buf, "%s\n", session->targetname); + break; + case ISCSI_PARAM_TARGET_ALIAS: + len = sysfs_emit(buf, "%s\n", session->targetalias); + break; + case ISCSI_PARAM_TPGT: + len = sysfs_emit(buf, "%d\n", session->tpgt); + break; + case ISCSI_PARAM_USERNAME: + len = sysfs_emit(buf, "%s\n", session->username); + break; + case ISCSI_PARAM_USERNAME_IN: + len = sysfs_emit(buf, "%s\n", session->username_in); + break; + case ISCSI_PARAM_PASSWORD: + len = sysfs_emit(buf, "%s\n", session->password); + break; + case ISCSI_PARAM_PASSWORD_IN: + len = sysfs_emit(buf, "%s\n", session->password_in); + break; + case ISCSI_PARAM_IFACE_NAME: + len = sysfs_emit(buf, "%s\n", session->ifacename); + break; + case ISCSI_PARAM_INITIATOR_NAME: + len = sysfs_emit(buf, "%s\n", session->initiatorname); + break; + case ISCSI_PARAM_BOOT_ROOT: + len = sysfs_emit(buf, "%s\n", session->boot_root); + break; + case ISCSI_PARAM_BOOT_NIC: + len = sysfs_emit(buf, "%s\n", session->boot_nic); + break; + case ISCSI_PARAM_BOOT_TARGET: + len = sysfs_emit(buf, "%s\n", session->boot_target); + break; + case ISCSI_PARAM_AUTO_SND_TGT_DISABLE: + len = sysfs_emit(buf, "%u\n", session->auto_snd_tgt_disable); + break; + case ISCSI_PARAM_DISCOVERY_SESS: + len = sysfs_emit(buf, "%u\n", session->discovery_sess); + break; + case ISCSI_PARAM_PORTAL_TYPE: + len = sysfs_emit(buf, "%s\n", session->portal_type); + break; + case ISCSI_PARAM_CHAP_AUTH_EN: + len = sysfs_emit(buf, "%u\n", session->chap_auth_en); + break; + case ISCSI_PARAM_DISCOVERY_LOGOUT_EN: + len = sysfs_emit(buf, "%u\n", session->discovery_logout_en); + break; + case ISCSI_PARAM_BIDI_CHAP_EN: + len = sysfs_emit(buf, "%u\n", session->bidi_chap_en); + break; + case ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL: + len = sysfs_emit(buf, "%u\n", session->discovery_auth_optional); + break; + case ISCSI_PARAM_DEF_TIME2WAIT: + len = sysfs_emit(buf, "%d\n", session->time2wait); + break; + case ISCSI_PARAM_DEF_TIME2RETAIN: + len = sysfs_emit(buf, "%d\n", session->time2retain); + break; + case ISCSI_PARAM_TSID: + len = sysfs_emit(buf, "%u\n", session->tsid); + break; + case ISCSI_PARAM_ISID: + len = sysfs_emit(buf, "%02x%02x%02x%02x%02x%02x\n", + session->isid[0], session->isid[1], + session->isid[2], session->isid[3], + session->isid[4], session->isid[5]); + break; + case ISCSI_PARAM_DISCOVERY_PARENT_IDX: + len = sysfs_emit(buf, "%u\n", session->discovery_parent_idx); + break; + case ISCSI_PARAM_DISCOVERY_PARENT_TYPE: + if (session->discovery_parent_type) + len = sysfs_emit(buf, "%s\n", + session->discovery_parent_type); + else + len = sysfs_emit(buf, "\n"); + break; + default: + return -ENOSYS; + } + + return len; +} +EXPORT_SYMBOL_GPL(iscsi_session_get_param); + +int iscsi_conn_get_addr_param(struct sockaddr_storage *addr, + enum iscsi_param param, char *buf) +{ + struct sockaddr_in6 *sin6 = NULL; + struct sockaddr_in *sin = NULL; + int len; + + switch (addr->ss_family) { + case AF_INET: + sin = (struct sockaddr_in *)addr; + break; + case AF_INET6: + sin6 = (struct sockaddr_in6 *)addr; + break; + default: + return -EINVAL; + } + + switch (param) { + case ISCSI_PARAM_CONN_ADDRESS: + case ISCSI_HOST_PARAM_IPADDRESS: + if (sin) + len = sysfs_emit(buf, "%pI4\n", &sin->sin_addr.s_addr); + else + len = sysfs_emit(buf, "%pI6\n", &sin6->sin6_addr); + break; + case ISCSI_PARAM_CONN_PORT: + case ISCSI_PARAM_LOCAL_PORT: + if (sin) + len = sysfs_emit(buf, "%hu\n", be16_to_cpu(sin->sin_port)); + else + len = sysfs_emit(buf, "%hu\n", + be16_to_cpu(sin6->sin6_port)); + break; + default: + return -EINVAL; + } + + return len; +} +EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param); + +int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, + enum iscsi_param param, char *buf) +{ + struct iscsi_conn *conn = cls_conn->dd_data; + int len; + + switch(param) { + case ISCSI_PARAM_PING_TMO: + len = sysfs_emit(buf, "%u\n", conn->ping_timeout); + break; + case ISCSI_PARAM_RECV_TMO: + len = sysfs_emit(buf, "%u\n", conn->recv_timeout); + break; + case ISCSI_PARAM_MAX_RECV_DLENGTH: + len = sysfs_emit(buf, "%u\n", conn->max_recv_dlength); + break; + case ISCSI_PARAM_MAX_XMIT_DLENGTH: + len = sysfs_emit(buf, "%u\n", conn->max_xmit_dlength); + break; + case ISCSI_PARAM_HDRDGST_EN: + len = sysfs_emit(buf, "%d\n", conn->hdrdgst_en); + break; + case ISCSI_PARAM_DATADGST_EN: + len = sysfs_emit(buf, "%d\n", conn->datadgst_en); + break; + case ISCSI_PARAM_IFMARKER_EN: + len = sysfs_emit(buf, "%d\n", conn->ifmarker_en); + break; + case ISCSI_PARAM_OFMARKER_EN: + len = sysfs_emit(buf, "%d\n", conn->ofmarker_en); + break; + case ISCSI_PARAM_EXP_STATSN: + len = sysfs_emit(buf, "%u\n", conn->exp_statsn); + break; + case ISCSI_PARAM_PERSISTENT_PORT: + len = sysfs_emit(buf, "%d\n", conn->persistent_port); + break; + case ISCSI_PARAM_PERSISTENT_ADDRESS: + len = sysfs_emit(buf, "%s\n", conn->persistent_address); + break; + case ISCSI_PARAM_STATSN: + len = sysfs_emit(buf, "%u\n", conn->statsn); + break; + case ISCSI_PARAM_MAX_SEGMENT_SIZE: + len = sysfs_emit(buf, "%u\n", conn->max_segment_size); + break; + case ISCSI_PARAM_KEEPALIVE_TMO: + len = sysfs_emit(buf, "%u\n", conn->keepalive_tmo); + break; + case ISCSI_PARAM_LOCAL_PORT: + len = sysfs_emit(buf, "%u\n", conn->local_port); + break; + case ISCSI_PARAM_TCP_TIMESTAMP_STAT: + len = sysfs_emit(buf, "%u\n", conn->tcp_timestamp_stat); + break; + case ISCSI_PARAM_TCP_NAGLE_DISABLE: + len = sysfs_emit(buf, "%u\n", conn->tcp_nagle_disable); + break; + case ISCSI_PARAM_TCP_WSF_DISABLE: + len = sysfs_emit(buf, "%u\n", conn->tcp_wsf_disable); + break; + case ISCSI_PARAM_TCP_TIMER_SCALE: + len = sysfs_emit(buf, "%u\n", conn->tcp_timer_scale); + break; + case ISCSI_PARAM_TCP_TIMESTAMP_EN: + len = sysfs_emit(buf, "%u\n", conn->tcp_timestamp_en); + break; + case ISCSI_PARAM_IP_FRAGMENT_DISABLE: + len = sysfs_emit(buf, "%u\n", conn->fragment_disable); + break; + case ISCSI_PARAM_IPV4_TOS: + len = sysfs_emit(buf, "%u\n", conn->ipv4_tos); + break; + case ISCSI_PARAM_IPV6_TC: + len = sysfs_emit(buf, "%u\n", conn->ipv6_traffic_class); + break; + case ISCSI_PARAM_IPV6_FLOW_LABEL: + len = sysfs_emit(buf, "%u\n", conn->ipv6_flow_label); + break; + case ISCSI_PARAM_IS_FW_ASSIGNED_IPV6: + len = sysfs_emit(buf, "%u\n", conn->is_fw_assigned_ipv6); + break; + case ISCSI_PARAM_TCP_XMIT_WSF: + len = sysfs_emit(buf, "%u\n", conn->tcp_xmit_wsf); + break; + case ISCSI_PARAM_TCP_RECV_WSF: + len = sysfs_emit(buf, "%u\n", conn->tcp_recv_wsf); + break; + case ISCSI_PARAM_LOCAL_IPADDR: + len = sysfs_emit(buf, "%s\n", conn->local_ipaddr); + break; + default: + return -ENOSYS; + } + + return len; +} +EXPORT_SYMBOL_GPL(iscsi_conn_get_param); + +int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param, + char *buf) +{ + struct iscsi_host *ihost = shost_priv(shost); + int len; + + switch (param) { + case ISCSI_HOST_PARAM_NETDEV_NAME: + len = sysfs_emit(buf, "%s\n", ihost->netdev); + break; + case ISCSI_HOST_PARAM_HWADDRESS: + len = sysfs_emit(buf, "%s\n", ihost->hwaddress); + break; + case ISCSI_HOST_PARAM_INITIATOR_NAME: + len = sysfs_emit(buf, "%s\n", ihost->initiatorname); + break; + default: + return -ENOSYS; + } + + return len; +} +EXPORT_SYMBOL_GPL(iscsi_host_get_param); + +int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param, + char *buf, int buflen) +{ + struct iscsi_host *ihost = shost_priv(shost); + + switch (param) { + case ISCSI_HOST_PARAM_NETDEV_NAME: + return iscsi_switch_str_param(&ihost->netdev, buf); + case ISCSI_HOST_PARAM_HWADDRESS: + return iscsi_switch_str_param(&ihost->hwaddress, buf); + case ISCSI_HOST_PARAM_INITIATOR_NAME: + return iscsi_switch_str_param(&ihost->initiatorname, buf); + default: + return -ENOSYS; + } + + return 0; +} +EXPORT_SYMBOL_GPL(iscsi_host_set_param); + +MODULE_AUTHOR("Mike Christie"); +MODULE_DESCRIPTION("iSCSI library functions"); +MODULE_LICENSE("GPL"); |