#include <linux/types.h>
#include <linux/kfifo.h>
#include <linux/delay.h>
+#include <linux/log2.h>
#include <asm/unaligned.h>
#include <net/tcp.h>
#include <scsi/scsi_cmnd.h>
* xmit thread
*/
if (!list_empty(&session->leadconn->xmitqueue) ||
- __kfifo_len(session->leadconn->mgmtqueue))
+ !list_empty(&session->leadconn->mgmtqueue))
scsi_queue_work(session->host,
&session->leadconn->xmitwork);
}
}
EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu);
+static int iscsi_add_hdr(struct iscsi_cmd_task *ctask, unsigned len)
+{
+ unsigned exp_len = ctask->hdr_len + len;
+
+ if (exp_len > ctask->hdr_max) {
+ WARN_ON(1);
+ return -EINVAL;
+ }
+
+ WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */
+ ctask->hdr_len = exp_len;
+ return 0;
+}
+
/**
* iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
* @ctask: iscsi cmd 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 void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask)
+static int iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask)
{
struct iscsi_conn *conn = ctask->conn;
struct iscsi_session *session = conn->session;
struct iscsi_cmd *hdr = ctask->hdr;
struct scsi_cmnd *sc = ctask->sc;
+ unsigned hdrlength;
+ int rc;
- hdr->opcode = ISCSI_OP_SCSI_CMD;
- hdr->flags = ISCSI_ATTR_SIMPLE;
- int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
- hdr->itt = build_itt(ctask->itt, conn->id, session->age);
- hdr->data_length = cpu_to_be32(scsi_bufflen(sc));
- hdr->cmdsn = cpu_to_be32(session->cmdsn);
- session->cmdsn++;
- hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
- memcpy(hdr->cdb, sc->cmnd, sc->cmd_len);
+ ctask->hdr_len = 0;
+ rc = iscsi_add_hdr(ctask, sizeof(*hdr));
+ if (rc)
+ return rc;
+ hdr->opcode = ISCSI_OP_SCSI_CMD;
+ hdr->flags = ISCSI_ATTR_SIMPLE;
+ int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
+ hdr->itt = build_itt(ctask->itt, conn->id, session->age);
+ hdr->data_length = cpu_to_be32(scsi_bufflen(sc));
+ hdr->cmdsn = cpu_to_be32(session->cmdsn);
+ session->cmdsn++;
+ hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
+ memcpy(hdr->cdb, sc->cmnd, sc->cmd_len);
if (sc->cmd_len < MAX_COMMAND_SIZE)
memset(&hdr->cdb[sc->cmd_len], 0,
MAX_COMMAND_SIZE - sc->cmd_len);
- ctask->data_count = 0;
ctask->imm_count = 0;
if (sc->sc_data_direction == DMA_TO_DEVICE) {
hdr->flags |= ISCSI_FLAG_CMD_WRITE;
else
ctask->imm_count = min(scsi_bufflen(sc),
conn->max_xmit_dlength);
- hton24(ctask->hdr->dlength, ctask->imm_count);
+ hton24(hdr->dlength, ctask->imm_count);
} else
- zero_data(ctask->hdr->dlength);
+ zero_data(hdr->dlength);
if (!session->initial_r2t_en) {
ctask->unsol_count = min((session->first_burst),
if (!ctask->unsol_count)
/* No unsolicit Data-Out's */
- ctask->hdr->flags |= ISCSI_FLAG_CMD_FINAL;
+ hdr->flags |= ISCSI_FLAG_CMD_FINAL;
} else {
hdr->flags |= ISCSI_FLAG_CMD_FINAL;
zero_data(hdr->dlength);
hdr->flags |= ISCSI_FLAG_CMD_READ;
}
- conn->scsicmd_pdus_cnt++;
+ /* calculate size of additional header segments (AHSs) */
+ hdrlength = ctask->hdr_len - sizeof(*hdr);
+
+ WARN_ON(hdrlength & (ISCSI_PAD_LEN-1));
+ hdrlength /= ISCSI_PAD_LEN;
+
+ WARN_ON(hdrlength >= 256);
+ hdr->hlength = hdrlength & 0xFF;
+
+ if (conn->session->tt->init_cmd_task(conn->ctask))
+ return EIO;
- debug_scsi("iscsi prep [%s cid %d sc %p cdb 0x%x itt 0x%x len %d "
+ conn->scsicmd_pdus_cnt++;
+ debug_scsi("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",
+ sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read",
conn->id, sc, sc->cmnd[0], ctask->itt, scsi_bufflen(sc),
- session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
+ session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
+ return 0;
}
/**
*/
static void iscsi_complete_command(struct iscsi_cmd_task *ctask)
{
- struct iscsi_session *session = ctask->conn->session;
+ struct iscsi_conn *conn = ctask->conn;
+ struct iscsi_session *session = conn->session;
struct scsi_cmnd *sc = ctask->sc;
ctask->state = ISCSI_TASK_COMPLETED;
ctask->sc = NULL;
/* SCSI eh reuses commands to verify us */
sc->SCp.ptr = NULL;
+ if (conn->ctask == ctask)
+ conn->ctask = NULL;
list_del_init(&ctask->running);
__kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
sc->scsi_done(sc);
iscsi_complete_command(ctask);
}
+/*
+ * session lock must be held
+ */
+static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
+ int err)
+{
+ struct scsi_cmnd *sc;
+
+ sc = ctask->sc;
+ if (!sc)
+ return;
+
+ if (ctask->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--;
+ else
+ conn->session->tt->cleanup_cmd_task(conn, ctask);
+
+ sc->result = err;
+ scsi_set_resid(sc, scsi_bufflen(sc));
+ if (conn->ctask == ctask)
+ conn->ctask = NULL;
+ /* release ref from queuecommand */
+ __iscsi_put_ctask(ctask);
+}
+
+/**
+ * iscsi_free_mgmt_task - return mgmt task back to pool
+ * @conn: iscsi connection
+ * @mtask: mtask
+ *
+ * Must be called with session lock.
+ */
+void iscsi_free_mgmt_task(struct iscsi_conn *conn,
+ struct iscsi_mgmt_task *mtask)
+{
+ list_del_init(&mtask->running);
+ if (conn->login_mtask == mtask)
+ return;
+
+ if (conn->ping_mtask == mtask)
+ conn->ping_mtask = NULL;
+ __kfifo_put(conn->session->mgmtpool.queue,
+ (void*)&mtask, sizeof(void*));
+}
+EXPORT_SYMBOL_GPL(iscsi_free_mgmt_task);
+
+static struct iscsi_mgmt_task *
+__iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
+ char *data, uint32_t data_size)
+{
+ struct iscsi_session *session = conn->session;
+ struct iscsi_mgmt_task *mtask;
+
+ if (session->state == ISCSI_STATE_TERMINATE)
+ return NULL;
+
+ if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) ||
+ hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
+ /*
+ * Login and Text are sent serially, in
+ * request-followed-by-response sequence.
+ * Same mtask can be used. Same ITT must be used.
+ * Note that login_mtask is preallocated at conn_create().
+ */
+ mtask = conn->login_mtask;
+ else {
+ BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
+ BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
+
+ if (!__kfifo_get(session->mgmtpool.queue,
+ (void*)&mtask, sizeof(void*)))
+ return NULL;
+ }
+
+ if (data_size) {
+ memcpy(mtask->data, data, data_size);
+ mtask->data_count = data_size;
+ } else
+ mtask->data_count = 0;
+
+ memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr));
+ INIT_LIST_HEAD(&mtask->running);
+ list_add_tail(&mtask->running, &conn->mgmtqueue);
+ return mtask;
+}
+
+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->lock);
+ if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size))
+ err = -EPERM;
+ spin_unlock_bh(&session->lock);
+ scsi_queue_work(session->host, &conn->xmitwork);
+ return err;
+}
+EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
+
/**
* iscsi_cmd_rsp - SCSI Command Response processing
* @conn: iscsi connection
min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
}
- if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) {
+ if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
+ ISCSI_FLAG_CMD_OVERFLOW)) {
int res_count = be32_to_cpu(rhdr->residual_count);
- if (res_count > 0 && res_count <= scsi_bufflen(sc))
+ if (res_count > 0 &&
+ (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
+ res_count <= scsi_bufflen(sc)))
scsi_set_resid(sc, res_count);
else
sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
- } else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW)
+ } else if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
+ ISCSI_FLAG_CMD_BIDI_OVERFLOW))
sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
- else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW)
- scsi_set_resid(sc, be32_to_cpu(rhdr->residual_count));
out:
debug_scsi("done [sc %lx res %d itt 0x%x]\n",
conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
conn->tmfrsp_pdus_cnt++;
- if (conn->tmabort_state != TMABORT_INITIAL)
+ if (conn->tmf_state != TMF_QUEUED)
return;
if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
- conn->tmabort_state = TMABORT_SUCCESS;
+ conn->tmf_state = TMF_SUCCESS;
else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
- conn->tmabort_state = TMABORT_NOT_FOUND;
+ conn->tmf_state = TMF_NOT_FOUND;
else
- conn->tmabort_state = TMABORT_FAILED;
+ conn->tmf_state = TMF_FAILED;
wake_up(&conn->ehwait);
}
+static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr)
+{
+ struct iscsi_nopout hdr;
+ struct iscsi_mgmt_task *mtask;
+
+ if (!rhdr && conn->ping_mtask)
+ return;
+
+ memset(&hdr, 0, sizeof(struct iscsi_nopout));
+ hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE;
+ hdr.flags = ISCSI_FLAG_CMD_FINAL;
+
+ if (rhdr) {
+ memcpy(hdr.lun, rhdr->lun, 8);
+ hdr.ttt = rhdr->ttt;
+ hdr.itt = RESERVED_ITT;
+ } else
+ hdr.ttt = RESERVED_ITT;
+
+ mtask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0);
+ if (!mtask) {
+ printk(KERN_ERR "Could not send nopout\n");
+ return;
+ }
+
+ /* only track our nops */
+ if (!rhdr) {
+ conn->ping_mtask = mtask;
+ conn->last_ping = jiffies;
+ }
+ scsi_queue_work(conn->session->host, &conn->xmitwork);
+}
+
static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
char *data, int datalen)
{
struct iscsi_mgmt_task *mtask;
uint32_t itt;
+ conn->last_recv = jiffies;
if (hdr->itt != RESERVED_ITT)
itt = get_itt(hdr->itt);
else
*/
if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
rc = ISCSI_ERR_CONN_FAILED;
- list_del(&mtask->running);
- if (conn->login_mtask != mtask)
- __kfifo_put(session->mgmtpool.queue,
- (void*)&mtask, sizeof(void*));
+ iscsi_free_mgmt_task(conn, mtask);
break;
case ISCSI_OP_SCSI_TMFUNC_RSP:
if (datalen) {
}
iscsi_tmf_rsp(conn, hdr);
+ iscsi_free_mgmt_task(conn, mtask);
break;
case ISCSI_OP_NOOP_IN:
- if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) {
+ if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) ||
+ datalen) {
rc = ISCSI_ERR_PROTO;
break;
}
conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
- if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
- rc = ISCSI_ERR_CONN_FAILED;
- list_del(&mtask->running);
- if (conn->login_mtask != mtask)
- __kfifo_put(session->mgmtpool.queue,
- (void*)&mtask, sizeof(void*));
+ if (conn->ping_mtask != mtask) {
+ /*
+ * If this is not in response to one of our
+ * nops then it must be from userspace.
+ */
+ if (iscsi_recv_pdu(conn->cls_conn, hdr, data,
+ datalen))
+ rc = ISCSI_ERR_CONN_FAILED;
+ }
+ iscsi_free_mgmt_task(conn, mtask);
break;
default:
rc = ISCSI_ERR_BAD_OPCODE;
if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
break;
- if (iscsi_recv_pdu(conn->cls_conn, hdr, NULL, 0))
- rc = ISCSI_ERR_CONN_FAILED;
+ iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr);
break;
case ISCSI_OP_REJECT:
rc = iscsi_handle_reject(conn, hdr, data, datalen);
session->tt->init_mgmt_task(conn, mtask);
debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
- hdr->opcode, hdr->itt, mtask->data_count);
+ hdr->opcode & ISCSI_OPCODE_MASK, hdr->itt,
+ mtask->data_count);
}
static int iscsi_xmit_mtask(struct iscsi_conn *conn)
{
struct iscsi_hdr *hdr = conn->mtask->hdr;
- int rc, was_logout = 0;
+ int rc;
+ if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT)
+ conn->session->state = ISCSI_STATE_LOGGING_OUT;
spin_unlock_bh(&conn->session->lock);
- if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) {
- conn->session->state = ISCSI_STATE_IN_RECOVERY;
- iscsi_block_session(session_to_cls(conn->session));
- was_logout = 1;
- }
+
rc = conn->session->tt->xmit_mgmt_task(conn, conn->mtask);
spin_lock_bh(&conn->session->lock);
if (rc)
/* done with this in-progress mtask */
conn->mtask = NULL;
-
- if (was_logout) {
- set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
- return -ENODATA;
- }
return 0;
}
static int iscsi_xmit_ctask(struct iscsi_conn *conn)
{
struct iscsi_cmd_task *ctask = conn->ctask;
- int rc = 0;
-
- /*
- * serialize with TMF AbortTask
- */
- if (ctask->state == ISCSI_TASK_ABORTING)
- goto done;
+ int rc;
__iscsi_get_ctask(ctask);
spin_unlock_bh(&conn->session->lock);
rc = conn->session->tt->xmit_cmd_task(conn, ctask);
spin_lock_bh(&conn->session->lock);
__iscsi_put_ctask(ctask);
-
-done:
if (!rc)
/* done with this ctask */
conn->ctask = NULL;
return rc;
}
+/**
+ * iscsi_requeue_ctask - requeue ctask to run from session workqueue
+ * @ctask: ctask to requeue
+ *
+ * LLDs that need to run a ctask from the session workqueue should call
+ * this. The session lock must be held.
+ */
+void iscsi_requeue_ctask(struct iscsi_cmd_task *ctask)
+{
+ struct iscsi_conn *conn = ctask->conn;
+
+ list_move_tail(&ctask->running, &conn->requeue);
+ scsi_queue_work(conn->session->host, &conn->xmitwork);
+}
+EXPORT_SYMBOL_GPL(iscsi_requeue_ctask);
+
/**
* iscsi_data_xmit - xmit any command into the scheduled connection
* @conn: iscsi connection
* overflow us with nop-ins
*/
check_mgmt:
- while (__kfifo_get(conn->mgmtqueue, (void*)&conn->mtask,
- sizeof(void*))) {
+ while (!list_empty(&conn->mgmtqueue)) {
+ conn->mtask = list_entry(conn->mgmtqueue.next,
+ struct iscsi_mgmt_task, running);
+ if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
+ iscsi_free_mgmt_task(conn, conn->mtask);
+ conn->mtask = NULL;
+ continue;
+ }
+
iscsi_prep_mtask(conn, conn->mtask);
- list_add_tail(&conn->mtask->running, &conn->mgmt_run_list);
+ list_move_tail(conn->mgmtqueue.next, &conn->mgmt_run_list);
rc = iscsi_xmit_mtask(conn);
if (rc)
goto again;
}
- /* process command queue */
+ /* process pending command queue */
while (!list_empty(&conn->xmitqueue)) {
- /*
- * iscsi tcp may readd the task to the xmitqueue to send
- * write data
- */
+ if (conn->tmf_state == TMF_QUEUED)
+ break;
+
conn->ctask = list_entry(conn->xmitqueue.next,
struct iscsi_cmd_task, running);
- switch (conn->ctask->state) {
- case ISCSI_TASK_ABORTING:
- break;
- case ISCSI_TASK_PENDING:
- iscsi_prep_scsi_cmd_pdu(conn->ctask);
- conn->session->tt->init_cmd_task(conn->ctask);
- /* fall through */
- default:
- conn->ctask->state = ISCSI_TASK_RUNNING;
- break;
+ if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
+ fail_command(conn, conn->ctask, DID_IMM_RETRY << 16);
+ continue;
+ }
+ if (iscsi_prep_scsi_cmd_pdu(conn->ctask)) {
+ fail_command(conn, conn->ctask, DID_ABORT << 16);
+ continue;
}
- list_move_tail(conn->xmitqueue.next, &conn->run_list);
+ conn->ctask->state = ISCSI_TASK_RUNNING;
+ list_move_tail(conn->xmitqueue.next, &conn->run_list);
rc = iscsi_xmit_ctask(conn);
if (rc)
goto again;
* we need to check the mgmt queue for nops that need to
* be sent to aviod starvation
*/
- if (__kfifo_len(conn->mgmtqueue))
+ if (!list_empty(&conn->mgmtqueue))
+ goto check_mgmt;
+ }
+
+ while (!list_empty(&conn->requeue)) {
+ if (conn->session->fast_abort && conn->tmf_state != TMF_INITIAL)
+ break;
+
+ /*
+ * we always do fastlogout - conn stop code will clean up.
+ */
+ if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
+ break;
+
+ conn->ctask = list_entry(conn->requeue.next,
+ struct iscsi_cmd_task, running);
+ conn->ctask->state = ISCSI_TASK_RUNNING;
+ list_move_tail(conn->requeue.next, &conn->run_list);
+ rc = iscsi_xmit_ctask(conn);
+ if (rc)
+ goto again;
+ if (!list_empty(&conn->mgmtqueue))
goto check_mgmt;
}
spin_unlock_bh(&conn->session->lock);
FAILURE_SESSION_TERMINATE,
FAILURE_SESSION_IN_RECOVERY,
FAILURE_SESSION_RECOVERY_TIMEOUT,
+ FAILURE_SESSION_LOGGING_OUT,
};
int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
sc->SCp.ptr = NULL;
host = sc->device->host;
- session = iscsi_hostdata(host->hostdata);
+ spin_unlock(host->host_lock);
+ session = iscsi_hostdata(host->hostdata);
spin_lock(&session->lock);
/*
* be entering our queuecommand while a block is starting
* up because the block code is not locked)
*/
- if (session->state == ISCSI_STATE_IN_RECOVERY) {
+ switch (session->state) {
+ case ISCSI_STATE_IN_RECOVERY:
reason = FAILURE_SESSION_IN_RECOVERY;
goto reject;
- }
-
- if (session->state == ISCSI_STATE_RECOVERY_FAILED)
+ case ISCSI_STATE_LOGGING_OUT:
+ reason = FAILURE_SESSION_LOGGING_OUT;
+ goto reject;
+ case ISCSI_STATE_RECOVERY_FAILED:
reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
- else if (session->state == ISCSI_STATE_TERMINATE)
+ break;
+ case ISCSI_STATE_TERMINATE:
reason = FAILURE_SESSION_TERMINATE;
- else
+ break;
+ default:
reason = FAILURE_SESSION_FREED;
+ }
goto fault;
}
atomic_set(&ctask->refcount, 1);
ctask->state = ISCSI_TASK_PENDING;
- ctask->mtask = NULL;
ctask->conn = conn;
ctask->sc = sc;
INIT_LIST_HEAD(&ctask->running);
spin_unlock(&session->lock);
scsi_queue_work(host, &conn->xmitwork);
+ spin_lock(host->host_lock);
return 0;
reject:
spin_unlock(&session->lock);
debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
+ spin_lock(host->host_lock);
return SCSI_MLQUEUE_HOST_BUSY;
fault:
sc->result = (DID_NO_CONNECT << 16);
scsi_set_resid(sc, scsi_bufflen(sc));
sc->scsi_done(sc);
+ spin_lock(host->host_lock);
return 0;
}
EXPORT_SYMBOL_GPL(iscsi_queuecommand);
}
EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
-static struct iscsi_mgmt_task *
-__iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
- char *data, uint32_t data_size)
-{
- struct iscsi_session *session = conn->session;
- struct iscsi_mgmt_task *mtask;
-
- if (session->state == ISCSI_STATE_TERMINATE)
- return NULL;
-
- if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) ||
- hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
- /*
- * Login and Text are sent serially, in
- * request-followed-by-response sequence.
- * Same mtask can be used. Same ITT must be used.
- * Note that login_mtask is preallocated at conn_create().
- */
- mtask = conn->login_mtask;
- else {
- BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
- BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
-
- if (!__kfifo_get(session->mgmtpool.queue,
- (void*)&mtask, sizeof(void*)))
- return NULL;
- }
-
- if (data_size) {
- memcpy(mtask->data, data, data_size);
- mtask->data_count = data_size;
- } else
- mtask->data_count = 0;
-
- INIT_LIST_HEAD(&mtask->running);
- memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr));
- __kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*));
- return mtask;
-}
-
-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->lock);
- if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size))
- err = -EPERM;
- spin_unlock_bh(&session->lock);
- scsi_queue_work(session->host, &conn->xmitwork);
- return err;
-}
-EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
-
void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
{
struct iscsi_session *session = class_to_transport_session(cls_session);
- struct iscsi_conn *conn = session->leadconn;
spin_lock_bh(&session->lock);
if (session->state != ISCSI_STATE_LOGGED_IN) {
session->state = ISCSI_STATE_RECOVERY_FAILED;
- if (conn)
- wake_up(&conn->ehwait);
+ if (session->leadconn)
+ wake_up(&session->leadconn->ehwait);
}
spin_unlock_bh(&session->lock);
}
struct Scsi_Host *host = sc->device->host;
struct iscsi_session *session = iscsi_hostdata(host->hostdata);
struct iscsi_conn *conn = session->leadconn;
- int fail_session = 0;
+ mutex_lock(&session->eh_mutex);
spin_lock_bh(&session->lock);
if (session->state == ISCSI_STATE_TERMINATE) {
failed:
debug_scsi("failing host reset: session terminated "
"[CID %d age %d]\n", conn->id, session->age);
spin_unlock_bh(&session->lock);
+ mutex_unlock(&session->eh_mutex);
return FAILED;
}
- if (sc->SCp.phase == session->age) {
- debug_scsi("failing connection CID %d due to SCSI host reset\n",
- conn->id);
- fail_session = 1;
- }
spin_unlock_bh(&session->lock);
-
+ mutex_unlock(&session->eh_mutex);
/*
* we drop the lock here but the leadconn cannot be destoyed while
* we are in the scsi eh
*/
- if (fail_session)
- iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
+ iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
debug_scsi("iscsi_eh_host_reset wait for relogin\n");
wait_event_interruptible(conn->ehwait,
if (signal_pending(current))
flush_signals(current);
+ mutex_lock(&session->eh_mutex);
spin_lock_bh(&session->lock);
if (session->state == ISCSI_STATE_LOGGED_IN)
printk(KERN_INFO "iscsi: host reset succeeded\n");
else
goto failed;
spin_unlock_bh(&session->lock);
-
+ mutex_unlock(&session->eh_mutex);
return SUCCESS;
}
EXPORT_SYMBOL_GPL(iscsi_eh_host_reset);
-static void iscsi_tmabort_timedout(unsigned long data)
+static void iscsi_tmf_timedout(unsigned long data)
{
- struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)data;
- struct iscsi_conn *conn = ctask->conn;
+ struct iscsi_conn *conn = (struct iscsi_conn *)data;
struct iscsi_session *session = conn->session;
spin_lock(&session->lock);
- if (conn->tmabort_state == TMABORT_INITIAL) {
- conn->tmabort_state = TMABORT_TIMEDOUT;
- debug_scsi("tmabort timedout [sc %p itt 0x%x]\n",
- ctask->sc, ctask->itt);
+ if (conn->tmf_state == TMF_QUEUED) {
+ conn->tmf_state = TMF_TIMEDOUT;
+ debug_scsi("tmf timedout\n");
/* unblock eh_abort() */
wake_up(&conn->ehwait);
}
spin_unlock(&session->lock);
}
-static int iscsi_exec_abort_task(struct scsi_cmnd *sc,
- struct iscsi_cmd_task *ctask)
+static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
+ struct iscsi_tm *hdr, int age,
+ int timeout)
{
- struct iscsi_conn *conn = ctask->conn;
struct iscsi_session *session = conn->session;
- struct iscsi_tm *hdr = &conn->tmhdr;
-
- /*
- * ctask timed out but session is OK requests must be serialized.
- */
- memset(hdr, 0, sizeof(struct iscsi_tm));
- hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
- hdr->flags = ISCSI_TM_FUNC_ABORT_TASK;
- hdr->flags |= ISCSI_FLAG_CMD_FINAL;
- memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
- hdr->rtt = ctask->hdr->itt;
- hdr->refcmdsn = ctask->hdr->cmdsn;
+ struct iscsi_mgmt_task *mtask;
- ctask->mtask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
- NULL, 0);
- if (!ctask->mtask) {
+ mtask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
+ NULL, 0);
+ if (!mtask) {
spin_unlock_bh(&session->lock);
iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
- spin_lock_bh(&session->lock)
- debug_scsi("abort sent failure [itt 0x%x]\n", ctask->itt);
+ spin_lock_bh(&session->lock);
+ debug_scsi("tmf exec failure\n");
return -EPERM;
}
- ctask->state = ISCSI_TASK_ABORTING;
+ conn->tmfcmd_pdus_cnt++;
+ conn->tmf_timer.expires = timeout * HZ + jiffies;
+ conn->tmf_timer.function = iscsi_tmf_timedout;
+ conn->tmf_timer.data = (unsigned long)conn;
+ add_timer(&conn->tmf_timer);
+ debug_scsi("tmf set timeout\n");
- debug_scsi("abort sent [itt 0x%x]\n", ctask->itt);
-
- if (conn->tmabort_state == TMABORT_INITIAL) {
- conn->tmfcmd_pdus_cnt++;
- conn->tmabort_timer.expires = 20*HZ + jiffies;
- conn->tmabort_timer.function = iscsi_tmabort_timedout;
- conn->tmabort_timer.data = (unsigned long)ctask;
- add_timer(&conn->tmabort_timer);
- debug_scsi("abort set timeout [itt 0x%x]\n", ctask->itt);
- }
spin_unlock_bh(&session->lock);
mutex_unlock(&session->eh_mutex);
scsi_queue_work(session->host, &conn->xmitwork);
/*
* block eh thread until:
*
- * 1) abort response
- * 2) abort timeout
+ * 1) tmf response
+ * 2) tmf timeout
* 3) session is terminated or restarted or userspace has
* given up on recovery
*/
- wait_event_interruptible(conn->ehwait,
- sc->SCp.phase != session->age ||
+ wait_event_interruptible(conn->ehwait, age != session->age ||
session->state != ISCSI_STATE_LOGGED_IN ||
- conn->tmabort_state != TMABORT_INITIAL);
+ conn->tmf_state != TMF_QUEUED);
if (signal_pending(current))
flush_signals(current);
- del_timer_sync(&conn->tmabort_timer);
+ del_timer_sync(&conn->tmf_timer);
+
mutex_lock(&session->eh_mutex);
spin_lock_bh(&session->lock);
+ /* if the session drops it will clean up the mtask */
+ if (age != session->age ||
+ session->state != ISCSI_STATE_LOGGED_IN)
+ return -ENOTCONN;
return 0;
}
/*
- * session lock must be held
+ * Fail commands. session lock held and recv side suspended and xmit
+ * thread flushed
*/
-static struct iscsi_mgmt_task *
-iscsi_remove_mgmt_task(struct kfifo *fifo, uint32_t itt)
+static void fail_all_commands(struct iscsi_conn *conn, unsigned lun)
{
- int i, nr_tasks = __kfifo_len(fifo) / sizeof(void*);
- struct iscsi_mgmt_task *task;
+ struct iscsi_cmd_task *ctask, *tmp;
- debug_scsi("searching %d tasks\n", nr_tasks);
+ if (conn->ctask && (conn->ctask->sc->device->lun == lun || lun == -1))
+ conn->ctask = NULL;
- for (i = 0; i < nr_tasks; i++) {
- __kfifo_get(fifo, (void*)&task, sizeof(void*));
- debug_scsi("check task %u\n", task->itt);
+ /* flush pending */
+ list_for_each_entry_safe(ctask, tmp, &conn->xmitqueue, running) {
+ if (lun == ctask->sc->device->lun || lun == -1) {
+ debug_scsi("failing pending sc %p itt 0x%x\n",
+ ctask->sc, ctask->itt);
+ fail_command(conn, ctask, DID_BUS_BUSY << 16);
+ }
+ }
- if (task->itt == itt) {
- debug_scsi("matched task\n");
- return task;
+ list_for_each_entry_safe(ctask, tmp, &conn->requeue, running) {
+ if (lun == ctask->sc->device->lun || lun == -1) {
+ debug_scsi("failing requeued sc %p itt 0x%x\n",
+ ctask->sc, ctask->itt);
+ fail_command(conn, ctask, DID_BUS_BUSY << 16);
}
+ }
- __kfifo_put(fifo, (void*)&task, sizeof(void*));
+ /* fail all other running */
+ list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) {
+ if (lun == ctask->sc->device->lun || lun == -1) {
+ debug_scsi("failing in progress sc %p itt 0x%x\n",
+ ctask->sc, ctask->itt);
+ fail_command(conn, ctask, DID_BUS_BUSY << 16);
+ }
}
- return NULL;
}
-static int iscsi_ctask_mtask_cleanup(struct iscsi_cmd_task *ctask)
+static void iscsi_suspend_tx(struct iscsi_conn *conn)
{
- struct iscsi_conn *conn = ctask->conn;
- struct iscsi_session *session = conn->session;
-
- if (!ctask->mtask)
- return -EINVAL;
+ set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
+ scsi_flush_work(conn->session->host);
+}
- if (!iscsi_remove_mgmt_task(conn->mgmtqueue, ctask->mtask->itt))
- list_del(&ctask->mtask->running);
- __kfifo_put(session->mgmtpool.queue, (void*)&ctask->mtask,
- sizeof(void*));
- ctask->mtask = NULL;
- return 0;
+static void iscsi_start_tx(struct iscsi_conn *conn)
+{
+ clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
+ scsi_queue_work(conn->session->host, &conn->xmitwork);
}
-/*
- * session lock must be held
- */
-static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
- int err)
+static enum scsi_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *scmd)
{
- struct scsi_cmnd *sc;
+ struct iscsi_cls_session *cls_session;
+ struct iscsi_session *session;
+ struct iscsi_conn *conn;
+ enum scsi_eh_timer_return rc = EH_NOT_HANDLED;
- sc = ctask->sc;
- if (!sc)
- return;
+ cls_session = starget_to_session(scsi_target(scmd->device));
+ session = class_to_transport_session(cls_session);
- if (ctask->state == ISCSI_TASK_PENDING)
+ debug_scsi("scsi cmd %p timedout\n", scmd);
+
+ spin_lock(&session->lock);
+ if (session->state != ISCSI_STATE_LOGGED_IN) {
/*
- * cmd never made it to the xmit thread, so we should not count
- * the cmd in the sequencing
+ * We are probably in the middle of iscsi recovery so let
+ * that complete and handle the error.
*/
- conn->session->queued_cmdsn--;
- else
- conn->session->tt->cleanup_cmd_task(conn, ctask);
- iscsi_ctask_mtask_cleanup(ctask);
+ rc = EH_RESET_TIMER;
+ goto done;
+ }
- sc->result = err;
- scsi_set_resid(sc, scsi_bufflen(sc));
- if (conn->ctask == ctask)
- conn->ctask = NULL;
- /* release ref from queuecommand */
- __iscsi_put_ctask(ctask);
+ conn = session->leadconn;
+ if (!conn) {
+ /* In the middle of shuting down */
+ rc = 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 (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
+ (conn->ping_timeout * HZ), jiffies))
+ rc = EH_RESET_TIMER;
+ /*
+ * if we are about to check the transport then give the command
+ * more time
+ */
+ if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ),
+ jiffies))
+ rc = EH_RESET_TIMER;
+ /* if in the middle of checking the transport then give us more time */
+ if (conn->ping_mtask)
+ rc = EH_RESET_TIMER;
+done:
+ spin_unlock(&session->lock);
+ debug_scsi("return %s\n", rc == EH_RESET_TIMER ? "timer reset" : "nh");
+ return rc;
}
-static void iscsi_suspend_tx(struct iscsi_conn *conn)
+static void iscsi_check_transport_timeouts(unsigned long data)
{
- set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
- scsi_flush_work(conn->session->host);
+ struct iscsi_conn *conn = (struct iscsi_conn *)data;
+ struct iscsi_session *session = conn->session;
+ unsigned long timeout, next_timeout = 0, last_recv;
+
+ spin_lock(&session->lock);
+ if (session->state != ISCSI_STATE_LOGGED_IN)
+ goto done;
+
+ timeout = conn->recv_timeout;
+ if (!timeout)
+ goto done;
+
+ timeout *= HZ;
+ last_recv = conn->last_recv;
+ if (time_before_eq(last_recv + timeout + (conn->ping_timeout * HZ),
+ jiffies)) {
+ printk(KERN_ERR "ping timeout of %d secs expired, "
+ "last rx %lu, last ping %lu, now %lu\n",
+ conn->ping_timeout, last_recv,
+ conn->last_ping, jiffies);
+ spin_unlock(&session->lock);
+ iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
+ return;
+ }
+
+ if (time_before_eq(last_recv + timeout, jiffies)) {
+ if (time_before_eq(conn->last_ping, last_recv)) {
+ /* send a ping to try to provoke some traffic */
+ debug_scsi("Sending nopout as ping on conn %p\n", conn);
+ iscsi_send_nopout(conn, NULL);
+ }
+ next_timeout = last_recv + timeout + (conn->ping_timeout * HZ);
+ } else {
+ next_timeout = last_recv + timeout;
+ }
+
+ if (next_timeout) {
+ debug_scsi("Setting next tmo %lu\n", next_timeout);
+ mod_timer(&conn->transport_timer, next_timeout);
+ }
+done:
+ spin_unlock(&session->lock);
}
-static void iscsi_start_tx(struct iscsi_conn *conn)
+static void iscsi_prep_abort_task_pdu(struct iscsi_cmd_task *ctask,
+ struct iscsi_tm *hdr)
{
- clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
- scsi_queue_work(conn->session->host, &conn->xmitwork);
+ 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;
+ memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
+ hdr->rtt = ctask->hdr->itt;
+ hdr->refcmdsn = ctask->hdr->cmdsn;
}
int iscsi_eh_abort(struct scsi_cmnd *sc)
{
struct Scsi_Host *host = sc->device->host;
struct iscsi_session *session = iscsi_hostdata(host->hostdata);
- struct iscsi_cmd_task *ctask;
struct iscsi_conn *conn;
- int rc;
+ struct iscsi_cmd_task *ctask;
+ struct iscsi_tm *hdr;
+ int rc, age;
mutex_lock(&session->eh_mutex);
spin_lock_bh(&session->lock);
return SUCCESS;
}
- ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
- conn = ctask->conn;
-
- conn->eh_abort_cnt++;
- debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt);
-
/*
* If we are not logged in or we have started a new session
* then let the host reset code handle this
*/
- if (session->state != ISCSI_STATE_LOGGED_IN ||
- sc->SCp.phase != session->age)
- goto failed;
+ if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
+ sc->SCp.phase != session->age) {
+ spin_unlock_bh(&session->lock);
+ mutex_unlock(&session->eh_mutex);
+ return FAILED;
+ }
+
+ conn = session->leadconn;
+ conn->eh_abort_cnt++;
+ age = session->age;
+
+ ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
+ debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt);
/* ctask completed before time out */
if (!ctask->sc) {
goto success;
}
- /* what should we do here ? */
- if (conn->ctask == ctask) {
- printk(KERN_INFO "iscsi: sc %p itt 0x%x partially sent. "
- "Failing abort\n", sc, ctask->itt);
- goto failed;
- }
-
if (ctask->state == ISCSI_TASK_PENDING) {
fail_command(conn, ctask, DID_ABORT << 16);
goto success;
}
- conn->tmabort_state = TMABORT_INITIAL;
- rc = iscsi_exec_abort_task(sc, ctask);
- if (rc || sc->SCp.phase != session->age ||
- session->state != ISCSI_STATE_LOGGED_IN)
+ /* only have one tmf outstanding at a time */
+ if (conn->tmf_state != TMF_INITIAL)
+ goto failed;
+ conn->tmf_state = TMF_QUEUED;
+
+ hdr = &conn->tmhdr;
+ iscsi_prep_abort_task_pdu(ctask, hdr);
+
+ if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) {
+ rc = FAILED;
goto failed;
- iscsi_ctask_mtask_cleanup(ctask);
+ }
- switch (conn->tmabort_state) {
- case TMABORT_SUCCESS:
+ switch (conn->tmf_state) {
+ case TMF_SUCCESS:
spin_unlock_bh(&session->lock);
iscsi_suspend_tx(conn);
/*
write_lock_bh(conn->recv_lock);
spin_lock(&session->lock);
fail_command(conn, ctask, DID_ABORT << 16);
+ conn->tmf_state = TMF_INITIAL;
spin_unlock(&session->lock);
write_unlock_bh(conn->recv_lock);
iscsi_start_tx(conn);
goto success_unlocked;
- case TMABORT_NOT_FOUND:
- if (!ctask->sc) {
+ case TMF_TIMEDOUT:
+ spin_unlock_bh(&session->lock);
+ iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
+ goto failed_unlocked;
+ case TMF_NOT_FOUND:
+ if (!sc->SCp.ptr) {
+ conn->tmf_state = TMF_INITIAL;
/* ctask completed before tmf abort response */
debug_scsi("sc completed while abort in progress\n");
goto success;
}
/* fall through */
default:
- /* timedout or failed */
- spin_unlock_bh(&session->lock);
- iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
- goto failed_unlocked;
+ conn->tmf_state = TMF_INITIAL;
+ goto failed;
}
success:
failed:
spin_unlock_bh(&session->lock);
failed_unlocked:
- debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
+ debug_scsi("abort failed [sc %p itt 0x%x]\n", sc,
+ ctask ? ctask->itt : 0);
mutex_unlock(&session->eh_mutex);
return FAILED;
}
EXPORT_SYMBOL_GPL(iscsi_eh_abort);
+static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
+{
+ memset(hdr, 0, sizeof(*hdr));
+ hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
+ hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
+ hdr->flags |= ISCSI_FLAG_CMD_FINAL;
+ int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
+ hdr->rtt = RESERVED_ITT;
+}
+
+int iscsi_eh_device_reset(struct scsi_cmnd *sc)
+{
+ struct Scsi_Host *host = sc->device->host;
+ struct iscsi_session *session = iscsi_hostdata(host->hostdata);
+ struct iscsi_conn *conn;
+ struct iscsi_tm *hdr;
+ int rc = FAILED;
+
+ debug_scsi("LU Reset [sc %p lun %u]\n", sc, sc->device->lun);
+
+ mutex_lock(&session->eh_mutex);
+ spin_lock_bh(&session->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 (conn->tmf_state != TMF_INITIAL)
+ goto unlock;
+ conn->tmf_state = TMF_QUEUED;
+
+ hdr = &conn->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 (conn->tmf_state) {
+ case TMF_SUCCESS:
+ break;
+ case TMF_TIMEDOUT:
+ spin_unlock_bh(&session->lock);
+ iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
+ goto done;
+ default:
+ conn->tmf_state = TMF_INITIAL;
+ goto unlock;
+ }
+
+ rc = SUCCESS;
+ spin_unlock_bh(&session->lock);
+
+ iscsi_suspend_tx(conn);
+ /* need to grab the recv lock then session lock */
+ write_lock_bh(conn->recv_lock);
+ spin_lock(&session->lock);
+ fail_all_commands(conn, sc->device->lun);
+ conn->tmf_state = TMF_INITIAL;
+ spin_unlock(&session->lock);
+ write_unlock_bh(conn->recv_lock);
+
+ iscsi_start_tx(conn);
+ goto done;
+
+unlock:
+ spin_unlock_bh(&session->lock);
+done:
+ debug_scsi("iscsi_eh_device_reset %s\n",
+ rc == SUCCESS ? "SUCCESS" : "FAILED");
+ mutex_unlock(&session->eh_mutex);
+ return rc;
+}
+EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
+
+/*
+ * 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_queue *q, int max, void ***items, int item_size)
+iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
{
- int i;
+ int i, num_arrays = 1;
- *items = kmalloc(max * sizeof(void*), GFP_KERNEL);
- if (*items == NULL)
- return -ENOMEM;
+ memset(q, 0, sizeof(*q));
q->max = max;
- q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL);
- if (q->pool == NULL) {
- kfree(*items);
- return -ENOMEM;
- }
+
+ /* If the user passed an items pointer, he wants a copy of
+ * the array. */
+ if (items)
+ num_arrays++;
+ q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL);
+ if (q->pool == NULL)
+ goto enomem;
q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
GFP_KERNEL, NULL);
- if (q->queue == ERR_PTR(-ENOMEM)) {
- kfree(q->pool);
- kfree(*items);
- return -ENOMEM;
- }
+ if (q->queue == ERR_PTR(-ENOMEM))
+ goto enomem;
for (i = 0; i < max; i++) {
- q->pool[i] = kmalloc(item_size, GFP_KERNEL);
+ q->pool[i] = kzalloc(item_size, GFP_KERNEL);
if (q->pool[i] == NULL) {
- int j;
-
- for (j = 0; j < i; j++)
- kfree(q->pool[j]);
-
- kfifo_free(q->queue);
- kfree(q->pool);
- kfree(*items);
- return -ENOMEM;
+ q->max = i;
+ goto enomem;
}
- memset(q->pool[i], 0, item_size);
- (*items)[i] = q->pool[i];
__kfifo_put(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_queue *q, void **items)
+void iscsi_pool_free(struct iscsi_pool *q)
{
int i;
for (i = 0; i < q->max; i++)
- kfree(items[i]);
- kfree(q->pool);
- kfree(items);
+ kfree(q->pool[i]);
+ if (q->pool)
+ kfree(q->pool);
}
EXPORT_SYMBOL_GPL(iscsi_pool_free);
qdepth = ISCSI_DEF_CMD_PER_LUN;
}
- if (cmds_max < 2 || (cmds_max & (cmds_max - 1)) ||
+ if (!is_power_of_2(cmds_max) ||
cmds_max >= ISCSI_MGMT_ITT_OFFSET) {
if (cmds_max != 0)
printk(KERN_ERR "iscsi: invalid can_queue of %d. "
shost->max_cmd_len = iscsit->max_cmd_len;
shost->transportt = scsit;
shost->transportt->create_work_queue = 1;
+ shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out;
*hostno = shost->host_no;
session = iscsi_hostdata(shost->hostdata);
memset(session, 0, sizeof(struct iscsi_session));
session->host = shost;
session->state = ISCSI_STATE_FREE;
+ session->fast_abort = 1;
+ session->lu_reset_timeout = 15;
+ session->abort_timeout = 10;
session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX;
session->cmds_max = cmds_max;
session->queued_cmdsn = session->cmdsn = initial_cmdsn;
cls_session_fail:
scsi_remove_host(shost);
add_host_fail:
- iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
+ iscsi_pool_free(&session->mgmtpool);
mgmtpool_alloc_fail:
- iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
+ iscsi_pool_free(&session->cmdpool);
cmdpool_alloc_fail:
scsi_host_put(shost);
return NULL;
struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
struct module *owner = cls_session->transport->owner;
- iscsi_unblock_session(cls_session);
+ iscsi_remove_session(cls_session);
scsi_remove_host(shost);
- iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
- iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
+ iscsi_pool_free(&session->mgmtpool);
+ iscsi_pool_free(&session->cmdpool);
kfree(session->password);
kfree(session->password_in);
kfree(session->hwaddress);
kfree(session->initiatorname);
- iscsi_destroy_session(cls_session);
+ iscsi_free_session(cls_session);
scsi_host_put(shost);
module_put(owner);
}
conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
conn->id = conn_idx;
conn->exp_statsn = 0;
- conn->tmabort_state = TMABORT_INITIAL;
+ conn->tmf_state = TMF_INITIAL;
+
+ init_timer(&conn->transport_timer);
+ conn->transport_timer.data = (unsigned long)conn;
+ conn->transport_timer.function = iscsi_check_transport_timeouts;
+
INIT_LIST_HEAD(&conn->run_list);
INIT_LIST_HEAD(&conn->mgmt_run_list);
+ INIT_LIST_HEAD(&conn->mgmtqueue);
INIT_LIST_HEAD(&conn->xmitqueue);
-
- /* initialize general immediate & non-immediate PDU commands queue */
- conn->mgmtqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
- GFP_KERNEL, NULL);
- if (conn->mgmtqueue == ERR_PTR(-ENOMEM))
- goto mgmtqueue_alloc_fail;
-
+ INIT_LIST_HEAD(&conn->requeue);
INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
/* allocate login_mtask used for the login/text sequences */
goto login_mtask_data_alloc_fail;
conn->login_mtask->data = conn->data = data;
- init_timer(&conn->tmabort_timer);
+ init_timer(&conn->tmf_timer);
init_waitqueue_head(&conn->ehwait);
return cls_conn;
__kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
sizeof(void*));
login_mtask_alloc_fail:
- kfifo_free(conn->mgmtqueue);
-mgmtqueue_alloc_fail:
iscsi_destroy_conn(cls_conn);
return NULL;
}
struct iscsi_session *session = conn->session;
unsigned long flags;
+ del_timer_sync(&conn->transport_timer);
+
spin_lock_bh(&session->lock);
- set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
if (session->leadconn == conn) {
/*
}
/* flush queued up work because we free the connection below */
- scsi_flush_work(session->host);
+ iscsi_suspend_tx(conn);
spin_lock_bh(&session->lock);
kfree(conn->data);
session->leadconn = NULL;
spin_unlock_bh(&session->lock);
- kfifo_free(conn->mgmtqueue);
-
iscsi_destroy_conn(cls_conn);
}
EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
return -EINVAL;
}
+ if (conn->ping_timeout && !conn->recv_timeout) {
+ printk(KERN_ERR "iscsi: invalid recv timeout of zero "
+ "Using 5 seconds\n.");
+ conn->recv_timeout = 5;
+ }
+
+ if (conn->recv_timeout && !conn->ping_timeout) {
+ printk(KERN_ERR "iscsi: invalid ping timeout of zero "
+ "Using 5 seconds.\n");
+ conn->ping_timeout = 5;
+ }
+
spin_lock_bh(&session->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:
/*
* commands after successful recovery
*/
conn->stop_stage = 0;
- conn->tmabort_state = TMABORT_INITIAL;
+ conn->tmf_state = TMF_INITIAL;
session->age++;
spin_unlock_bh(&session->lock);
struct iscsi_mgmt_task *mtask, *tmp;
/* handle pending */
- while (__kfifo_get(conn->mgmtqueue, (void*)&mtask, sizeof(void*))) {
- if (mtask == conn->login_mtask)
- continue;
+ list_for_each_entry_safe(mtask, tmp, &conn->mgmtqueue, running) {
debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt);
- __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
- sizeof(void*));
+ iscsi_free_mgmt_task(conn, mtask);
}
/* handle running */
list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) {
debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt);
- list_del(&mtask->running);
-
- if (mtask == conn->login_mtask)
- continue;
- __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
- sizeof(void*));
+ iscsi_free_mgmt_task(conn, mtask);
}
conn->mtask = NULL;
}
-/* Fail commands. Mutex and session lock held and recv side suspended */
-static void fail_all_commands(struct iscsi_conn *conn)
-{
- struct iscsi_cmd_task *ctask, *tmp;
-
- /* flush pending */
- list_for_each_entry_safe(ctask, tmp, &conn->xmitqueue, running) {
- debug_scsi("failing pending sc %p itt 0x%x\n", ctask->sc,
- ctask->itt);
- fail_command(conn, ctask, DID_BUS_BUSY << 16);
- }
-
- /* fail all other running */
- list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) {
- debug_scsi("failing in progress sc %p itt 0x%x\n",
- ctask->sc, ctask->itt);
- fail_command(conn, ctask, DID_BUS_BUSY << 16);
- }
-
- conn->ctask = NULL;
-}
-
static void iscsi_start_session_recovery(struct iscsi_session *session,
struct iscsi_conn *conn, int flag)
{
int old_stop_stage;
+ del_timer_sync(&conn->transport_timer);
+
mutex_lock(&session->eh_mutex);
spin_lock_bh(&session->lock);
if (conn->stop_stage == STOP_CONN_TERM) {
* flush queues.
*/
spin_lock_bh(&session->lock);
- fail_all_commands(conn);
+ fail_all_commands(conn, -1);
flush_control_queues(session, conn);
spin_unlock_bh(&session->lock);
mutex_unlock(&session->eh_mutex);
uint32_t value;
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_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;
int len;
switch(param) {
+ case ISCSI_PARAM_FAST_ABORT:
+ len = sprintf(buf, "%d\n", session->fast_abort);
+ break;
+ case ISCSI_PARAM_ABORT_TMO:
+ len = sprintf(buf, "%d\n", session->abort_timeout);
+ break;
+ case ISCSI_PARAM_LU_RESET_TMO:
+ len = sprintf(buf, "%d\n", session->lu_reset_timeout);
+ break;
case ISCSI_PARAM_INITIAL_R2T_EN:
len = sprintf(buf, "%d\n", session->initial_r2t_en);
break;
int len;
switch(param) {
+ case ISCSI_PARAM_PING_TMO:
+ len = sprintf(buf, "%u\n", conn->ping_timeout);
+ break;
+ case ISCSI_PARAM_RECV_TMO:
+ len = sprintf(buf, "%u\n", conn->recv_timeout);
+ break;
case ISCSI_PARAM_MAX_RECV_DLENGTH:
len = sprintf(buf, "%u\n", conn->max_recv_dlength);
break;
projects / linux-2.6-omap-h63xx.git / blobdiff