summaryrefslogtreecommitdiffstats
path: root/drivers/scsi/libiscsi.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--drivers/scsi/libiscsi.c3934
1 files changed, 3934 insertions, 0 deletions
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
new file mode 100644
index 000000000..6e811d753
--- /dev/null
+++ b/drivers/scsi/libiscsi.c
@@ -0,0 +1,3934 @@
+// 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);
+
+#define ISCSI_CMD_COMPL_WAIT 5
+
+inline void iscsi_conn_queue_xmit(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_xmit);
+
+inline void iscsi_conn_queue_recv(struct iscsi_conn *conn)
+{
+ struct Scsi_Host *shost = conn->session->host;
+ struct iscsi_host *ihost = shost_priv(shost);
+
+ if (ihost->workq && !test_bit(ISCSI_CONN_FLAG_SUSPEND_RX, &conn->flags))
+ queue_work(ihost->workq, &conn->recvwork);
+}
+EXPORT_SYMBOL_GPL(iscsi_conn_queue_recv);
+
+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 */
+ iscsi_cmd(sc)->task = 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)
+ scsi_done(sc);
+ }
+}
+
+bool iscsi_get_task(struct iscsi_task *task)
+{
+ return refcount_inc_not_zero(&task->refcount);
+}
+EXPORT_SYMBOL_GPL(iscsi_get_task);
+
+/**
+ * __iscsi_put_task - drop the refcount on a task
+ * @task: iscsi_task to drop the refcount on
+ *
+ * The back_lock must be held when calling in case it frees the 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;
+
+ if (refcount_dec_and_test(&task->refcount)) {
+ spin_lock_bh(&session->back_lock);
+ iscsi_free_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;
+
+ 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);
+
+/*
+ * Must be called with back and frwd lock
+ */
+static bool cleanup_queued_task(struct iscsi_task *task)
+{
+ struct iscsi_conn *conn = task->conn;
+ bool early_complete = false;
+
+ /*
+ * We might have raced where we handled a R2T early and got a response
+ * but have not yet taken the task off the requeue list, then a TMF or
+ * recovery happened and so we can still see it here.
+ */
+ if (task->state == ISCSI_TASK_COMPLETED)
+ early_complete = true;
+
+ if (!list_empty(&task->running)) {
+ list_del_init(&task->running);
+ /*
+ * If it's on a list but still running this could be cleanup
+ * from a TMF or session recovery.
+ */
+ if (task->state == ISCSI_TASK_RUNNING ||
+ task->state == ISCSI_TASK_COMPLETED)
+ __iscsi_put_task(task);
+ }
+
+ if (conn->session->running_aborted_task == task) {
+ conn->session->running_aborted_task = NULL;
+ __iscsi_put_task(task);
+ }
+
+ if (conn->task == task) {
+ conn->task = NULL;
+ __iscsi_put_task(task);
+ }
+
+ return early_complete;
+}
+
+/*
+ * session back and frwd 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 (cleanup_queued_task(task))
+ 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 = task->sc;
+ sc->result = err << 16;
+ scsi_set_resid(sc, scsi_bufflen(sc));
+ iscsi_complete_task(task, state);
+}
+
+static void fail_scsi_task(struct iscsi_task *task, int err)
+{
+ struct iscsi_session *session = task->conn->session;
+
+ spin_lock_bh(&session->back_lock);
+ __fail_scsi_task(task, err);
+ spin_unlock_bh(&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;
+}
+
+/**
+ * iscsi_alloc_mgmt_task - allocate and setup a mgmt task.
+ * @conn: iscsi conn that the task will be sent on.
+ * @hdr: iscsi pdu that will be sent.
+ * @data: buffer for data segment if needed.
+ * @data_size: length of data in bytes.
+ */
+static struct iscsi_task *
+iscsi_alloc_mgmt_task(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
+ char *data, uint32_t data_size)
+{
+ struct iscsi_session *session = conn->session;
+ uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
+ struct iscsi_task *task;
+ itt_t itt;
+
+ if (session->state == ISCSI_STATE_TERMINATE ||
+ !test_bit(ISCSI_CONN_FLAG_BOUND, &conn->flags))
+ 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);
+ }
+
+ return task;
+
+free_task:
+ iscsi_put_task(task);
+ return NULL;
+}
+
+/**
+ * iscsi_send_mgmt_task - Send task created with iscsi_alloc_mgmt_task.
+ * @task: iscsi task to send.
+ *
+ * On failure this returns a non-zero error code, and the driver must free
+ * the task with iscsi_put_task;
+ */
+static int iscsi_send_mgmt_task(struct iscsi_task *task)
+{
+ struct iscsi_conn *conn = task->conn;
+ struct iscsi_session *session = conn->session;
+ struct iscsi_host *ihost = shost_priv(conn->session->host);
+ int rc = 0;
+
+ if (!ihost->workq) {
+ rc = iscsi_prep_mgmt_task(conn, task);
+ if (rc)
+ return rc;
+
+ rc = session->tt->xmit_task(task);
+ if (rc)
+ return rc;
+ } else {
+ list_add_tail(&task->running, &conn->mgmtqueue);
+ iscsi_conn_queue_xmit(conn);
+ }
+
+ return 0;
+}
+
+static int __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
+ char *data, uint32_t data_size)
+{
+ struct iscsi_task *task;
+ int rc;
+
+ task = iscsi_alloc_mgmt_task(conn, hdr, data, data_size);
+ if (!task)
+ return -ENOMEM;
+
+ rc = iscsi_send_mgmt_task(task);
+ if (rc)
+ iscsi_put_task(task);
+ return rc;
+}
+
+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_scsi_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, &sector);
+ if (ascq) {
+ scsi_build_sense(sc, 1, 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;
+ }
+
+ 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_alloc_mgmt_task(conn, (struct iscsi_hdr *)&hdr, NULL, 0);
+ if (!task)
+ return -ENOMEM;
+
+ if (!rhdr)
+ WRITE_ONCE(conn->ping_task, task);
+
+ if (iscsi_send_mgmt_task(task)) {
+ if (!rhdr)
+ WRITE_ONCE(conn->ping_task, NULL);
+ iscsi_put_task(task);
+
+ 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 (iscsi_cmd(task->sc)->age != conn->session->age) {
+ iscsi_session_printk(KERN_ERR, conn->session,
+ "task's session age %d, expected %d\n",
+ iscsi_cmd(task->sc)->age, 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_CONN_FLAG_SUSPEND_TX, &conn->flags);
+ set_bit(ISCSI_CONN_FLAG_SUSPEND_RX, &conn->flags);
+ 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,
+ bool was_requeue)
+{
+ int rc;
+
+ if (!conn->task) {
+ /*
+ * Take a ref so we can access it after xmit_task().
+ *
+ * This should never fail because the failure paths will have
+ * stopped the xmit thread.
+ */
+ if (!iscsi_get_task(task)) {
+ WARN_ON_ONCE(1);
+ return 0;
+ }
+ } else {
+ /* Already have a ref from when we failed to send it last call */
+ conn->task = NULL;
+ }
+
+ /*
+ * If this was a requeue for a R2T we have an extra ref on the task in
+ * case a bad target sends a cmd rsp before we have handled the task.
+ */
+ if (was_requeue)
+ iscsi_put_task(task);
+
+ /*
+ * Do this after dropping the extra ref because if this was a requeue
+ * it's removed from that list and cleanup_queued_task would miss it.
+ */
+ if (test_bit(ISCSI_CONN_FLAG_SUSPEND_TX, &conn->flags)) {
+ /*
+ * Save the task and ref in case we weren't cleaning up this
+ * task and get woken up again.
+ */
+ conn->task = task;
+ return -ENODATA;
+ }
+
+ 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;
+ } else {
+ /*
+ * get an extra ref that is released next time we access it
+ * as conn->task above.
+ */
+ iscsi_get_task(task);
+ conn->task = task;
+ }
+
+ iscsi_put_task(task);
+ return rc;
+}
+
+/**
+ * iscsi_requeue_task - requeue task to run from session workqueue
+ * @task: task to requeue
+ *
+ * Callers must have taken a ref to the task that is going to be requeued.
+ */
+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->session->frwd_lock);
+ if (list_empty(&task->running)) {
+ list_add_tail(&task->running, &conn->requeue);
+ } else {
+ /*
+ * Don't need the extra ref since it's already requeued and
+ * has a ref.
+ */
+ iscsi_put_task(task);
+ }
+ iscsi_conn_queue_xmit(conn);
+ spin_unlock_bh(&conn->session->frwd_lock);
+}
+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_CONN_FLAG_SUSPEND_TX, &conn->flags)) {
+ 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, conn->task, false);
+ 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
+ */
+check_mgmt:
+ while (!list_empty(&conn->mgmtqueue)) {
+ task = list_entry(conn->mgmtqueue.next, struct iscsi_task,
+ running);
+ list_del_init(&task->running);
+ if (iscsi_prep_mgmt_task(conn, task)) {
+ /* regular RX path uses back_lock */
+ spin_lock_bh(&conn->session->back_lock);
+ __iscsi_put_task(task);
+ spin_unlock_bh(&conn->session->back_lock);
+ continue;
+ }
+ rc = iscsi_xmit_task(conn, task, false);
+ if (rc)
+ goto done;
+ }
+
+check_requeue:
+ 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;
+
+ list_del_init(&task->running);
+ rc = iscsi_xmit_task(conn, task, true);
+ if (rc)
+ goto done;
+ if (!list_empty(&conn->mgmtqueue))
+ goto check_mgmt;
+ }
+
+ /* process pending command queue */
+ while (!list_empty(&conn->cmdqueue)) {
+ task = list_entry(conn->cmdqueue.next, struct iscsi_task,
+ running);
+ list_del_init(&task->running);
+ if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
+ fail_scsi_task(task, DID_IMM_RETRY);
+ continue;
+ }
+ rc = iscsi_prep_scsi_cmd_pdu(task);
+ if (rc) {
+ if (rc == -ENOMEM || rc == -EACCES)
+ fail_scsi_task(task, DID_IMM_RETRY);
+ else
+ fail_scsi_task(task, DID_ABORT);
+ continue;
+ }
+ rc = iscsi_xmit_task(conn, task, false);
+ 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
+ */
+ if (!list_empty(&conn->mgmtqueue))
+ goto check_mgmt;
+ if (!list_empty(&conn->requeue))
+ goto check_requeue;
+ }
+
+ 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;
+
+ iscsi_cmd(sc)->age = conn->session->age;
+ iscsi_cmd(sc)->task = 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;
+ iscsi_cmd(sc)->task = 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_CONN_FLAG_SUSPEND_TX, &conn->flags)) {
+ 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 {
+ list_add_tail(&task->running, &conn->cmdqueue);
+ iscsi_conn_queue_xmit(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));
+ 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;
+
+ if (__iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr, NULL, 0)) {
+ 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 frwd lock held and xmit thread flushed.
+ */
+static void fail_scsi_tasks(struct iscsi_conn *conn, u64 lun, int error)
+{
+ struct iscsi_session *session = conn->session;
+ struct iscsi_task *task;
+ int i;
+
+restart_cmd_loop:
+ spin_lock_bh(&session->back_lock);
+ for (i = 0; i < session->cmds_max; i++) {
+ task = session->cmds[i];
+ if (!task->sc || task->state == ISCSI_TASK_FREE)
+ continue;
+
+ if (lun != -1 && lun != task->sc->device->lun)
+ continue;
+ /*
+ * The cmd is completing but if this is called from an eh
+ * callout path then when we return scsi-ml owns the cmd. Wait
+ * for the completion path to finish freeing the cmd.
+ */
+ if (!iscsi_get_task(task)) {
+ spin_unlock_bh(&session->back_lock);
+ spin_unlock_bh(&session->frwd_lock);
+ udelay(ISCSI_CMD_COMPL_WAIT);
+ spin_lock_bh(&session->frwd_lock);
+ goto restart_cmd_loop;
+ }
+
+ ISCSI_DBG_SESSION(session,
+ "failing sc %p itt 0x%x state %d\n",
+ task->sc, task->itt, task->state);
+ __fail_scsi_task(task, error);
+ __iscsi_put_task(task);
+ }
+ spin_unlock_bh(&session->back_lock);
+}
+
+/**
+ * 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_CONN_FLAG_SUSPEND_TX, &conn->flags);
+ spin_unlock_bh(&conn->session->frwd_lock);
+}
+EXPORT_SYMBOL_GPL(iscsi_suspend_queue);
+
+/**
+ * iscsi_suspend_tx - suspend iscsi_data_xmit
+ * @conn: iscsi conn to 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_CONN_FLAG_SUSPEND_TX, &conn->flags);
+ if (ihost->workq)
+ flush_work(&conn->xmitwork);
+}
+EXPORT_SYMBOL_GPL(iscsi_suspend_tx);
+
+static void iscsi_start_tx(struct iscsi_conn *conn)
+{
+ clear_bit(ISCSI_CONN_FLAG_SUSPEND_TX, &conn->flags);
+ iscsi_conn_queue_xmit(conn);
+}
+
+/**
+ * iscsi_suspend_rx - Prevent recvwork from running again.
+ * @conn: iscsi conn to stop.
+ */
+void iscsi_suspend_rx(struct iscsi_conn *conn)
+{
+ struct Scsi_Host *shost = conn->session->host;
+ struct iscsi_host *ihost = shost_priv(shost);
+
+ set_bit(ISCSI_CONN_FLAG_SUSPEND_RX, &conn->flags);
+ if (ihost->workq)
+ flush_work(&conn->recvwork);
+}
+EXPORT_SYMBOL_GPL(iscsi_suspend_rx);
+
+/*
+ * 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);
+ spin_lock(&session->back_lock);
+ task = iscsi_cmd(sc)->task;
+ if (!task) {
+ /*
+ * Raced with completion. Blk layer has taken ownership
+ * so let timeout code complete it now.
+ */
+ rc = BLK_EH_DONE;
+ spin_unlock(&session->back_lock);
+ goto done;
+ }
+ if (!iscsi_get_task(task)) {
+ /*
+ * Racing with the completion path right now, so give it more
+ * time so that path can complete it like normal.
+ */
+ rc = BLK_EH_RESET_TIMER;
+ task = NULL;
+ spin_unlock(&session->back_lock);
+ goto done;
+ }
+ spin_unlock(&session->back_lock);
+
+ 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;
+ }
+
+ spin_lock(&session->back_lock);
+ 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);
+ spin_unlock(&session->back_lock);
+ rc = BLK_EH_RESET_TIMER;
+ goto done;
+ }
+ }
+ spin_unlock(&session->back_lock);
+
+ /* 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:
+ spin_unlock_bh(&session->frwd_lock);
+
+ if (task) {
+ task->last_timeout = jiffies;
+ iscsi_put_task(task);
+ }
+ 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);
+ clear_bit(ISCSI_CONN_FLAG_BOUND, &conn->flags);
+
+ 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);
+
+completion_check:
+ 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 (!iscsi_cmd(sc)->task) {
+ 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 ||
+ iscsi_cmd(sc)->age != 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;
+ }
+
+ spin_lock(&session->back_lock);
+ task = iscsi_cmd(sc)->task;
+ if (!task || !task->sc) {
+ /* task completed before time out */
+ ISCSI_DBG_EH(session, "sc completed while abort in progress\n");
+
+ spin_unlock(&session->back_lock);
+ spin_unlock_bh(&session->frwd_lock);
+ mutex_unlock(&session->eh_mutex);
+ return SUCCESS;
+ }
+
+ if (!iscsi_get_task(task)) {
+ spin_unlock(&session->back_lock);
+ spin_unlock_bh(&session->frwd_lock);
+ mutex_unlock(&session->eh_mutex);
+ /* We are just about to call iscsi_free_task so wait for it. */
+ udelay(ISCSI_CMD_COMPL_WAIT);
+ goto completion_check;
+ }
+
+ ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n", sc, task->itt);
+ conn = session->leadconn;
+ iscsi_get_conn(conn->cls_conn);
+ conn->eh_abort_cnt++;
+ age = session->age;
+ spin_unlock(&session->back_lock);
+
+ 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:
+ session->running_aborted_task = task;
+ spin_unlock_bh(&session->frwd_lock);
+ iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
+ goto failed_unlocked;
+ case TMF_NOT_FOUND:
+ if (iscsi_task_is_completed(task)) {
+ 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);
+ iscsi_put_task(task);
+ iscsi_put_conn(conn->cls_conn);
+ 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);
+ /*
+ * The driver might be accessing the task so hold the ref. The conn
+ * stop cleanup will drop the ref after ep_disconnect so we know the
+ * driver's no longer touching the task.
+ */
+ if (!session->running_aborted_task)
+ iscsi_put_task(task);
+
+ iscsi_put_conn(conn->cls_conn);
+ 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;
+
+ 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;
+ }
+
+ conn = session->leadconn;
+ iscsi_get_conn(conn->cls_conn);
+
+ spin_unlock_bh(&session->frwd_lock);
+ mutex_unlock(&session->eh_mutex);
+
+ iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
+ iscsi_put_conn(conn->cls_conn);
+
+ 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);
+
+int iscsi_host_get_max_scsi_cmds(struct Scsi_Host *shost,
+ uint16_t requested_cmds_max)
+{
+ int scsi_cmds, total_cmds = requested_cmds_max;
+
+check:
+ 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 max cmds of %d. Must be a power of two that is at least %d.\n",
+ total_cmds, ISCSI_TOTAL_CMDS_MIN);
+ return -EINVAL;
+ }
+
+ if (total_cmds > ISCSI_TOTAL_CMDS_MAX) {
+ printk(KERN_INFO "iscsi: invalid max cmds of %d. Must be a power of 2 less than or equal to %d. Using %d.\n",
+ requested_cmds_max, ISCSI_TOTAL_CMDS_MAX,
+ ISCSI_TOTAL_CMDS_MAX);
+ total_cmds = ISCSI_TOTAL_CMDS_MAX;
+ }
+
+ if (!is_power_of_2(total_cmds)) {
+ total_cmds = rounddown_pow_of_two(total_cmds);
+ if (total_cmds < ISCSI_TOTAL_CMDS_MIN) {
+ printk(KERN_ERR "iscsi: invalid max cmds of %d. Must be a power of 2 greater than %d.\n", requested_cmds_max, ISCSI_TOTAL_CMDS_MIN);
+ return -EINVAL;
+ }
+
+ printk(KERN_INFO "iscsi: invalid max cmds %d. Must be a power of 2. Rounding max cmds down to %d.\n",
+ requested_cmds_max, total_cmds);
+ }
+
+ scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX;
+ if (shost->can_queue && scsi_cmds > shost->can_queue) {
+ total_cmds = shost->can_queue;
+
+ printk(KERN_INFO "iscsi: requested max cmds %u is higher than driver limit. Using driver limit %u\n",
+ requested_cmds_max, shost->can_queue);
+ goto check;
+ }
+
+ return scsi_cmds;
+}
+EXPORT_SYMBOL_GPL(iscsi_host_get_max_scsi_cmds);
+
+/**
+ * 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) {
+ ihost->workq = alloc_workqueue("iscsi_q_%d",
+ WQ_SYSFS | __WQ_LEGACY | WQ_MEM_RECLAIM | WQ_UNBOUND,
+ 1, shost->host_no);
+ 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
+ * @is_shutdown: true if called from a driver shutdown callout
+ *
+ * If there are any sessions left, this will initiate the removal and wait
+ * for the completion.
+ */
+void iscsi_host_remove(struct Scsi_Host *shost, bool is_shutdown)
+{
+ 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);
+
+ if (!is_shutdown)
+ iscsi_host_for_each_session(shost, iscsi_notify_host_removed);
+ else
+ iscsi_host_for_each_session(shost, iscsi_force_destroy_session);
+
+ wait_event_interruptible(ihost->session_removal_wq,
+ ihost->num_sessions == 0);
+ if (signal_pending(current))
+ flush_signals(current);
+
+ scsi_remove_host(shost);
+}
+EXPORT_SYMBOL_GPL(iscsi_host_remove);
+
+void iscsi_host_free(struct Scsi_Host *shost)
+{
+ struct iscsi_host *ihost = shost_priv(shost);
+
+ if (ihost->workq)
+ destroy_workqueue(ihost->workq);
+
+ 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;
+ 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);
+
+ scsi_cmds = iscsi_host_get_max_scsi_cmds(shost, cmds_max);
+ if (scsi_cmds < 0)
+ goto dec_session_count;
+
+ 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 = scsi_cmds + ISCSI_MGMT_CMDS_MAX;
+ 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);
+ init_waitqueue_head(&session->ehwait);
+
+ 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);
+
+/*
+ * issi_session_remove - Remove session from iSCSI class.
+ */
+void iscsi_session_remove(struct iscsi_cls_session *cls_session)
+{
+ struct iscsi_session *session = cls_session->dd_data;
+ struct Scsi_Host *shost = session->host;
+
+ iscsi_remove_session(cls_session);
+ /*
+ * host removal only has to wait for its children to be removed from
+ * sysfs, and iscsi_tcp needs to do iscsi_host_remove before freeing
+ * the session, so drop the session count here.
+ */
+ iscsi_host_dec_session_cnt(shost);
+}
+EXPORT_SYMBOL_GPL(iscsi_session_remove);
+
+/**
+ * iscsi_session_free - Free iscsi session and it's resources
+ * @cls_session: iscsi session
+ */
+void iscsi_session_free(struct iscsi_cls_session *cls_session)
+{
+ struct iscsi_session *session = cls_session->dd_data;
+ struct module *owner = cls_session->transport->owner;
+
+ iscsi_pool_free(&session->cmdpool);
+ 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);
+ module_put(owner);
+}
+EXPORT_SYMBOL_GPL(iscsi_session_free);
+
+/**
+ * iscsi_session_teardown - destroy session and cls_session
+ * @cls_session: iscsi session
+ */
+void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
+{
+ iscsi_session_remove(cls_session);
+ iscsi_session_free(cls_session);
+}
+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;
+ int err;
+
+ cls_conn = iscsi_alloc_conn(cls_session, sizeof(*conn) + dd_size,
+ conn_idx);
+ if (!cls_conn)
+ return NULL;
+ conn = cls_conn->dd_data;
+
+ 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);
+ 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;
+
+ err = iscsi_add_conn(cls_conn);
+ if (err)
+ goto login_task_add_dev_fail;
+
+ return cls_conn;
+
+login_task_add_dev_fail:
+ free_pages((unsigned long) conn->data,
+ get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
+
+login_task_data_alloc_fail:
+ kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
+ sizeof(void*));
+login_task_alloc_fail:
+ iscsi_put_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;
+
+ iscsi_remove_conn(cls_conn);
+
+ 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));
+ kfree(conn->persistent_address);
+ kfree(conn->local_ipaddr);
+ /* 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_put_conn(cls_conn);
+}
+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);
+
+ spin_lock_bh(&session->back_lock);
+ if (cleanup_queued_task(task)) {
+ spin_unlock_bh(&session->back_lock);
+ continue;
+ }
+
+ state = ISCSI_TASK_ABRT_SESS_RECOV;
+ if (task->state == ISCSI_TASK_PENDING)
+ state = ISCSI_TASK_COMPLETED;
+ 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;
+
+ set_bit(ISCSI_CONN_FLAG_BOUND, &conn->flags);
+ spin_unlock_bh(&session->frwd_lock);
+
+ /*
+ * The target could have reduced it's window size between logins, so
+ * we have to reset max/exp cmdsn so we can see the new values.
+ */
+ spin_lock_bh(&session->back_lock);
+ session->max_cmdsn = session->exp_cmdsn = session->cmdsn + 1;
+ spin_unlock_bh(&session->back_lock);
+ /*
+ * Unblock xmitworker(), Login Phase will pass through.
+ */
+ clear_bit(ISCSI_CONN_FLAG_SUSPEND_RX, &conn->flags);
+ clear_bit(ISCSI_CONN_FLAG_SUSPEND_TX, &conn->flags);
+ 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");
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-22 10:52:26 +0000