#include <linux/kfifo.h>
#include <linux/delay.h>
#include <linux/log2.h>
+#include <linux/slab.h>
#include <asm/unaligned.h>
#include <net/tcp.h>
#include <scsi/scsi_cmnd.h>
}
EXPORT_SYMBOL_GPL(iscsi_conn_queue_work);
-void
-iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
+static void __iscsi_update_cmdsn(struct iscsi_session *session,
+ uint32_t exp_cmdsn, uint32_t max_cmdsn)
{
- uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn);
- uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn);
-
/*
* standard specifies this check for when to update expected and
* max sequence numbers
iscsi_conn_queue_work(session->leadconn);
}
}
+
+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_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_conn *conn = task->conn;
+ struct iscsi_tm *tmf = &conn->tmhdr;
+ unsigned int hdr_lun;
+
+ if (conn->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((struct scsi_lun *)tmf->lun);
+ if (hdr_lun != task->sc->device->lun)
+ return 0;
+ /* fall through */
+ case ISCSI_TM_FUNC_TARGET_WARM_RESET:
+ /*
+ * Fail all SCSI cmd PDUs
+ */
+ if (opcode != ISCSI_OP_SCSI_DATA_OUT) {
+ iscsi_conn_printk(KERN_INFO, conn,
+ "task [op %x/%x itt "
+ "0x%x/0x%x] "
+ "rejected.\n",
+ task->hdr->opcode, opcode,
+ task->itt, task->hdr_itt);
+ return -EACCES;
+ }
+ /*
+ * And also all data-out PDUs in response to R2T
+ * if fast_abort is set.
+ */
+ if (conn->session->fast_abort) {
+ iscsi_conn_printk(KERN_INFO, conn,
+ "task [op %x/%x itt "
+ "0x%x/0x%x] fast abort.\n",
+ task->hdr->opcode, 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(conn->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
*
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)
hdr->flags = ISCSI_ATTR_SIMPLE;
int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
memcpy(task->lun, hdr->lun, sizeof(task->lun));
- hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn);
- session->cmdsn++;
hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
cmd_len = sc->cmd_len;
if (cmd_len < ISCSI_CDB_SIZE)
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 "
if (conn->login_task == task)
return;
- __kfifo_put(session->cmdpool.queue, (void*)&task, sizeof(void*));
+ kfifo_in(&session->cmdpool.queue, (void*)&task, sizeof(void*));
if (sc) {
task->sc = NULL;
__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 lock
+ */
+void iscsi_complete_scsi_task(struct iscsi_task *task,
+ uint32_t exp_cmdsn, uint32_t max_cmdsn)
+{
+ struct iscsi_conn *conn = task->conn;
+
+ ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt);
+
+ conn->last_recv = jiffies;
+ __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn);
+ iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
+}
+EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task);
+
+
/*
* session lock must be held and if not called for a task that is
* still pending or from the xmit thread, then xmit thread must
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 (hdr->opcode != (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) &&
- hdr->opcode != (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
+ 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, so we never hit this.
+ * 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)) {
{
struct iscsi_session *session = conn->session;
struct iscsi_host *ihost = shost_priv(session->host);
+ uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
struct iscsi_task *task;
itt_t itt;
if (session->state == ISCSI_STATE_TERMINATE)
return NULL;
- if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) ||
- hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
+ 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;
+ }
+
task = conn->login_task;
- else {
+ } else {
if (session->state != ISCSI_STATE_LOGGED_IN)
return NULL;
BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
- if (!__kfifo_get(session->cmdpool.queue,
+ if (!kfifo_out(&session->cmdpool.queue,
(void*)&task, sizeof(void*)))
return NULL;
}
}
}
+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 (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 (reject->reason == ISCSI_REASON_DATA_DIGEST_ERROR) {
- if (ntoh24(reject->dlength) > datalen)
- return ISCSI_ERR_PROTO;
+ 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",
+ rejected_pdu.itt, opcode);
+ 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",
+ rejected_pdu.itt, opcode);
+ /*
+ * 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 (ntoh24(reject->dlength) >= sizeof(struct iscsi_hdr)) {
- memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
- iscsi_conn_printk(KERN_ERR, conn,
- "pdu (op 0x%x) rejected "
- "due to DataDigest error.\n",
- rejected_pdu.opcode);
+ if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG))
+ /*
+ * nop-out in response to target's nop-out rejected.
+ * Just resend.
+ */
+ iscsi_send_nopout(conn,
+ (struct iscsi_nopin*)&rejected_pdu);
+ 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.itt,
+ rejected_pdu.opcode, reject->reason);
+ break;
}
- return 0;
+ return rc;
}
/**
}
conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
- if (conn->ping_task != task)
- /*
- * If this is not in response to one of our
- * nops then it must be from userspace.
- */
- goto recv_pdu;
-
- mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout);
- iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
+ rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr,
+ data, datalen);
break;
default:
rc = ISCSI_ERR_BAD_OPCODE;
struct iscsi_task *task = conn->task;
int rc;
+ if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx))
+ return -ENODATA;
+
__iscsi_get_task(task);
spin_unlock_bh(&conn->session->lock);
rc = conn->session->tt->xmit_task(task);
**/
static int iscsi_data_xmit(struct iscsi_conn *conn)
{
+ struct iscsi_task *task;
int rc = 0;
spin_lock_bh(&conn->session->lock);
- if (unlikely(conn->suspend_tx)) {
+ if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n");
spin_unlock_bh(&conn->session->lock);
return -ENODATA;
if (conn->task) {
rc = iscsi_xmit_task(conn);
if (rc)
- goto again;
+ goto done;
}
/*
}
rc = iscsi_xmit_task(conn);
if (rc)
- goto again;
+ goto done;
}
/* process pending command queue */
while (!list_empty(&conn->cmdqueue)) {
- if (conn->tmf_state == TMF_QUEUED)
- break;
-
- conn->task = list_entry(conn->cmdqueue.next,
- struct iscsi_task, running);
+ conn->task = list_entry(conn->cmdqueue.next, struct iscsi_task,
+ running);
list_del_init(&conn->task->running);
if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
fail_scsi_task(conn->task, DID_IMM_RETRY);
}
rc = iscsi_prep_scsi_cmd_pdu(conn->task);
if (rc) {
- if (rc == -ENOMEM) {
+ if (rc == -ENOMEM || rc == -EACCES) {
list_add_tail(&conn->task->running,
&conn->cmdqueue);
conn->task = NULL;
- goto again;
+ goto done;
} else
fail_scsi_task(conn->task, DID_ABORT);
continue;
}
rc = iscsi_xmit_task(conn);
if (rc)
- goto again;
+ goto done;
/*
* we could continuously get new task requests so
* we need to check the mgmt queue for nops that need to
}
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->task = list_entry(conn->requeue.next,
- struct iscsi_task, running);
+ task = list_entry(conn->requeue.next, struct iscsi_task,
+ running);
+ if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT))
+ break;
+
+ conn->task = task;
list_del_init(&conn->task->running);
conn->task->state = ISCSI_TASK_RUNNING;
rc = iscsi_xmit_task(conn);
if (rc)
- goto again;
+ goto done;
if (!list_empty(&conn->mgmtqueue))
goto check_mgmt;
}
spin_unlock_bh(&conn->session->lock);
return -ENODATA;
-again:
- if (unlikely(conn->suspend_tx))
- rc = -ENODATA;
+done:
spin_unlock_bh(&conn->session->lock);
return rc;
}
{
struct iscsi_task *task;
- if (!__kfifo_get(conn->session->cmdpool.queue,
+ if (!kfifo_out(&conn->session->cmdpool.queue,
(void *) &task, sizeof(void *)))
return NULL;
goto fault;
}
+ if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
+ reason = FAILURE_SESSION_IN_RECOVERY;
+ sc->result = DID_REQUEUE;
+ goto fault;
+ }
+
if (iscsi_check_cmdsn_window_closed(conn)) {
reason = FAILURE_WINDOW_CLOSED;
goto reject;
if (!ihost->workq) {
reason = iscsi_prep_scsi_cmd_pdu(task);
if (reason) {
- if (reason == -ENOMEM) {
+ if (reason == -ENOMEM || reason == -EACCES) {
reason = FAILURE_OOM;
goto prepd_reject;
} else {
}
}
if (session->tt->xmit_task(task)) {
+ session->cmdsn--;
reason = FAILURE_SESSION_NOT_READY;
goto prepd_reject;
}
}
EXPORT_SYMBOL_GPL(iscsi_queuecommand);
-int iscsi_change_queue_depth(struct scsi_device *sdev, int depth)
+int iscsi_change_queue_depth(struct scsi_device *sdev, int depth, int reason)
{
- scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
+ switch (reason) {
+ case SCSI_QDEPTH_DEFAULT:
+ scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
+ break;
+ case SCSI_QDEPTH_QFULL:
+ scsi_track_queue_full(sdev, depth);
+ break;
+ case SCSI_QDEPTH_RAMP_UP:
+ scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
+ break;
+ default:
+ return -EOPNOTSUPP;
+ }
return sdev->queue_depth;
}
EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
}
EXPORT_SYMBOL_GPL(iscsi_target_alloc);
-void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
-{
- struct iscsi_session *session = cls_session->dd_data;
-
- spin_lock_bh(&session->lock);
- if (session->state != ISCSI_STATE_LOGGED_IN) {
- session->state = ISCSI_STATE_RECOVERY_FAILED;
- if (session->leadconn)
- wake_up(&session->leadconn->ehwait);
- }
- spin_unlock_bh(&session->lock);
-}
-EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
-
-int iscsi_eh_target_reset(struct scsi_cmnd *sc)
-{
- struct iscsi_cls_session *cls_session;
- struct iscsi_session *session;
- struct iscsi_conn *conn;
-
- cls_session = starget_to_session(scsi_target(sc->device));
- session = cls_session->dd_data;
- conn = session->leadconn;
-
- mutex_lock(&session->eh_mutex);
- spin_lock_bh(&session->lock);
- if (session->state == ISCSI_STATE_TERMINATE) {
-failed:
- ISCSI_DBG_EH(session,
- "failing target reset: Could not log back into "
- "target [age %d]\n",
- session->age);
- spin_unlock_bh(&session->lock);
- mutex_unlock(&session->eh_mutex);
- return FAILED;
- }
-
- 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
- */
- iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
-
- ISCSI_DBG_EH(session, "wait for relogin\n");
- wait_event_interruptible(conn->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->lock);
- if (session->state == ISCSI_STATE_LOGGED_IN) {
- ISCSI_DBG_EH(session,
- "target reset succeeded\n");
- } else
- goto failed;
- spin_unlock_bh(&session->lock);
- mutex_unlock(&session->eh_mutex);
- return SUCCESS;
-}
-EXPORT_SYMBOL_GPL(iscsi_eh_target_reset);
-
static void iscsi_tmf_timedout(unsigned long data)
{
struct iscsi_conn *conn = (struct iscsi_conn *)data;
}
}
+/**
+ * iscsi_suspend_queue - suspend iscsi_queuecommand
+ * @conn: iscsi conn to stop queueing IO on
+ *
+ * This grabs the session 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->lock);
+ set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
+ spin_unlock_bh(&conn->session->lock);
+}
+EXPORT_SYMBOL_GPL(iscsi_suspend_queue);
+
+/**
+ * iscsi_suspend_tx - suspend iscsi_data_xmit
+ * @conn: iscsi conn tp stop processing IO on.
+ *
+ * This function sets the suspend bit to prevent iscsi_data_xmit
+ * from sending new IO, and if work is queued on the xmit thread
+ * it will wait for it to be completed.
+ */
void iscsi_suspend_tx(struct iscsi_conn *conn)
{
struct Scsi_Host *shost = conn->session->host;
static enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc)
{
enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED;
- struct iscsi_task *task = NULL;
+ 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;
}
task = (struct iscsi_task *)sc->SCp.ptr;
- if (!task)
+ if (!task) {
+ /*
+ * Raced with completion. Just reset timer, and let it
+ * complete normally
+ */
+ 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
* we can check if it is the task or connection when we send the
* nop as a ping.
*/
- if (time_after_eq(task->last_xfer, task->last_timeout)) {
+ 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 recv at %lu. Last timeout was at "
+ "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;
}
+ for (i = 0; i < conn->session->cmds_max; i++) {
+ running_task = conn->session->cmds[i];
+ if (!running_task->sc || running_task == task ||
+ running_task->state != ISCSI_TASK_RUNNING)
+ continue;
+
+ /*
+ * Only check if cmds started before this one have made
+ * progress, or this could never fail
+ */
+ if (time_after(running_task->sc->jiffies_at_alloc,
+ task->sc->jiffies_at_alloc))
+ continue;
+
+ if (time_after(running_task->last_xfer, task->last_timeout)) {
+ /*
+ * This task has not made progress, but a task
+ * started before us has transferred data since
+ * we started/last-checked. We could be queueing
+ * too many tasks or the LU is bad.
+ *
+ * If the device is bad the cmds ahead of us on
+ * other devs will complete, and this loop will
+ * eventually fail starting the scsi eh.
+ */
+ ISCSI_DBG_EH(session, "Command has not made progress "
+ "but commands ahead of it have. "
+ "Asking scsi-ml for more time to "
+ "complete. Our last xfer vs running task "
+ "last xfer %lu/%lu. Last check %lu.\n",
+ task->last_xfer, running_task->last_xfer,
+ task->last_timeout);
+ rc = BLK_EH_RESET_TIMER;
+ goto done;
+ }
+ }
+
/* Assumes nop timeout is shorter than scsi cmd timeout */
if (task->have_checked_conn)
goto done;
* good and have never sent us a successful tmf response
* then sent more data for the cmd.
*/
- spin_lock(&session->lock);
+ spin_lock_bh(&session->lock);
fail_scsi_task(task, DID_ABORT);
conn->tmf_state = TMF_INITIAL;
- spin_unlock(&session->lock);
+ memset(hdr, 0, sizeof(*hdr));
+ spin_unlock_bh(&session->lock);
iscsi_start_tx(conn);
goto success_unlocked;
case TMF_TIMEDOUT:
case TMF_NOT_FOUND:
if (!sc->SCp.ptr) {
conn->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");
iscsi_suspend_tx(conn);
spin_lock_bh(&session->lock);
+ memset(hdr, 0, sizeof(*hdr));
fail_scsi_tasks(conn, sc->device->lun, DID_ERROR);
conn->tmf_state = TMF_INITIAL;
spin_unlock_bh(&session->lock);
}
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->lock);
+ if (session->state != ISCSI_STATE_LOGGED_IN) {
+ session->state = ISCSI_STATE_RECOVERY_FAILED;
+ if (session->leadconn)
+ wake_up(&session->leadconn->ehwait);
+ }
+ spin_unlock_bh(&session->lock);
+}
+EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
+
+/**
+ * iscsi_eh_session_reset - drop session and attempt relogin
+ * @sc: scsi command
+ *
+ * This function will wait for a relogin, session termination from
+ * userspace, or a recovery/replacement timeout.
+ */
+int iscsi_eh_session_reset(struct scsi_cmnd *sc)
+{
+ struct iscsi_cls_session *cls_session;
+ struct iscsi_session *session;
+ struct iscsi_conn *conn;
+
+ cls_session = starget_to_session(scsi_target(sc->device));
+ session = cls_session->dd_data;
+ conn = session->leadconn;
+
+ mutex_lock(&session->eh_mutex);
+ spin_lock_bh(&session->lock);
+ if (session->state == ISCSI_STATE_TERMINATE) {
+failed:
+ ISCSI_DBG_EH(session,
+ "failing session reset: Could not log back into "
+ "%s, %s [age %d]\n", session->targetname,
+ conn->persistent_address, session->age);
+ spin_unlock_bh(&session->lock);
+ mutex_unlock(&session->eh_mutex);
+ return FAILED;
+ }
+
+ 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
+ */
+ iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
+
+ ISCSI_DBG_EH(session, "wait for relogin\n");
+ wait_event_interruptible(conn->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->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->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.
+ */
+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->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_tgt_reset_pdu(sc, hdr);
+
+ if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
+ session->tgt_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);
+
+ spin_lock_bh(&session->lock);
+ memset(hdr, 0, sizeof(*hdr));
+ fail_scsi_tasks(conn, -1, DID_ERROR);
+ conn->tmf_state = TMF_INITIAL;
+ spin_unlock_bh(&session->lock);
+
+ iscsi_start_tx(conn);
+ goto done;
+
+unlock:
+ spin_unlock_bh(&session->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;
+}
+EXPORT_SYMBOL_GPL(iscsi_eh_target_reset);
+
+/**
+ * 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.
if (q->pool == NULL)
return -ENOMEM;
- q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
- GFP_KERNEL, NULL);
- if (IS_ERR(q->queue)) {
- q->queue = NULL;
- goto 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);
q->max = i;
goto enomem;
}
- __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
+ kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*));
}
if (items) {
for (i = 0; i < q->max; i++)
kfree(q->pool[i]);
kfree(q->pool);
- kfree(q->queue);
}
EXPORT_SYMBOL_GPL(iscsi_pool_free);
*/
struct iscsi_cls_session *
iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
- uint16_t cmds_max, int cmd_task_size,
+ 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);
scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX;
cls_session = iscsi_alloc_session(shost, iscsit,
- sizeof(struct iscsi_session));
+ sizeof(struct iscsi_session) +
+ dd_size);
if (!cls_session)
goto dec_session_count;
session = cls_session->dd_data;
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->max_cmdsn = initial_cmdsn + 1;
session->max_r2t = 1;
session->tt = iscsit;
+ session->dd_data = cls_session->dd_data + sizeof(*session);
mutex_init(&session->eh_mutex);
spin_lock_init(&session->lock);
/* allocate login_task used for the login/text sequences */
spin_lock_bh(&session->lock);
- if (!__kfifo_get(session->cmdpool.queue,
+ if (!kfifo_out(&session->cmdpool.queue,
(void*)&conn->login_task,
sizeof(void*))) {
spin_unlock_bh(&session->lock);
return cls_conn;
login_task_data_alloc_fail:
- __kfifo_put(session->cmdpool.queue, (void*)&conn->login_task,
+ kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
sizeof(void*));
login_task_alloc_fail:
iscsi_destroy_conn(cls_conn);
free_pages((unsigned long) conn->data,
get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
kfree(conn->persistent_address);
- __kfifo_put(session->cmdpool.queue, (void*)&conn->login_task,
+ kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
sizeof(void*));
if (session->leadconn == conn)
session->leadconn = NULL;
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->lock);
del_timer_sync(&conn->transport_timer);
iscsi_suspend_tx(conn);
spin_lock_bh(&session->lock);
- old_stop_stage = conn->stop_stage;
- conn->stop_stage = flag;
conn->c_stage = ISCSI_CONN_STOPPED;
spin_unlock_bh(&session->lock);
spin_lock_bh(&session->lock);
fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED);
fail_mgmt_tasks(session, conn);
+ memset(&conn->tmhdr, 0, sizeof(conn->tmhdr));
spin_unlock_bh(&session->lock);
mutex_unlock(&session->eh_mutex);
}
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_LU_RESET_TMO:
len = sprintf(buf, "%d\n", session->lu_reset_timeout);
break;
+ case ISCSI_PARAM_TGT_RESET_TMO:
+ len = sprintf(buf, "%d\n", session->tgt_reset_timeout);
+ break;
case ISCSI_PARAM_INITIAL_R2T_EN:
len = sprintf(buf, "%d\n", session->initial_r2t_en);
break;
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff