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freebsd-skq/sys/dev/iscsi/initiator/isc_sm.c
Ed Schouten 7870adb640 Remove direct access to si_name. 
Code should just use the devtoname() function to obtain the name of a
character device. Also add const keywords to pieces of code that need it
to build properly.

MFC after:	2 weeks
2012-02-10 12:35:57 +00:00

787 lines
18 KiB
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Raw Blame History

/*-
* Copyright (c) 2005-2010 Daniel Braniss <danny@cs.huji.ac.il>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
/*
| iSCSI - Session Manager
| $Id: isc_sm.c 743 2009-08-08 10:54:53Z danny $
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_iscsi_initiator.h"
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/conf.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/ctype.h>
#include <sys/errno.h>
#include <sys/sysctl.h>
#include <sys/file.h>
#include <sys/uio.h>
#include <sys/socketvar.h>
#include <sys/socket.h>
#include <sys/protosw.h>
#include <sys/proc.h>
#include <sys/ioccom.h>
#include <sys/queue.h>
#include <sys/kthread.h>
#include <sys/syslog.h>
#include <sys/mbuf.h>
#include <sys/bus.h>
#include <sys/sx.h>
#include <cam/cam.h>
#include <cam/cam_ccb.h>
#include <cam/cam_sim.h>
#include <cam/cam_xpt_sim.h>
#include <cam/cam_periph.h>
#include <dev/iscsi/initiator/iscsi.h>
#include <dev/iscsi/initiator/iscsivar.h>
static void
_async(isc_session_t *sp, pduq_t *pq)
{
debug_called(8);
iscsi_async(sp, pq);
pdu_free(sp->isc, pq);
}
static void
_reject(isc_session_t *sp, pduq_t *pq)
{
pduq_t *opq;
pdu_t *pdu;
reject_t *reject;
int itt;
debug_called(8);
pdu = mtod(pq->mp, pdu_t *);
itt = pdu->ipdu.bhs.itt;
reject = &pq->pdu.ipdu.reject;
sdebug(2, "itt=%x reason=0x%x", ntohl(itt), reject->reason);
opq = i_search_hld(sp, itt, 0);
if(opq != NULL)
iscsi_reject(sp, opq, pq);
else {
switch(pq->pdu.ipdu.bhs.opcode) {
case ISCSI_LOGOUT_CMD: // XXX: wasabi does this - can't figure out why
sdebug(2, "ISCSI_LOGOUT_CMD ...");
break;
default:
xdebug("%d] we lost something itt=%x",
sp->sid, ntohl(pq->pdu.ipdu.bhs.itt));
}
}
pdu_free(sp->isc, pq);
}
static void
_r2t(isc_session_t *sp, pduq_t *pq)
{
pduq_t *opq;
debug_called(8);
opq = i_search_hld(sp, pq->pdu.ipdu.bhs.itt, 1);
if(opq != NULL) {
iscsi_r2t(sp, opq, pq);
}
else {
r2t_t *r2t = &pq->pdu.ipdu.r2t;
xdebug("%d] we lost something itt=%x r2tSN=%d bo=%x ddtl=%x",
sp->sid, ntohl(pq->pdu.ipdu.bhs.itt),
ntohl(r2t->r2tSN), ntohl(r2t->bo), ntohl(r2t->ddtl));
}
pdu_free(sp->isc, pq);
}
static void
_scsi_rsp(isc_session_t *sp, pduq_t *pq)
{
pduq_t *opq;
debug_called(8);
opq = i_search_hld(sp, pq->pdu.ipdu.bhs.itt, 0);
debug(5, "itt=%x pq=%p opq=%p", ntohl(pq->pdu.ipdu.bhs.itt), pq, opq);
if(opq != NULL) {
iscsi_done(sp, opq, pq);
i_acked_hld(sp, &pq->pdu);
}
else
xdebug("%d] we lost something itt=%x",
sp->sid, ntohl(pq->pdu.ipdu.bhs.itt));
pdu_free(sp->isc, pq);
}
static void
_read_data(isc_session_t *sp, pduq_t *pq)
{
pduq_t *opq;
debug_called(8);
opq = i_search_hld(sp, pq->pdu.ipdu.bhs.itt, 1);
if(opq != NULL) {
if(scsi_decap(sp, opq, pq) != 1) {
i_remove_hld(sp, opq); // done
pdu_free(sp->isc, opq);
}
}
else
xdebug("%d] we lost something itt=%x",
sp->sid, ntohl(pq->pdu.ipdu.bhs.itt));
pdu_free(sp->isc, pq);
}
/*
| this is a kludge,
| the jury is not back with a veredict, user or kernel
*/
static void
_nop_out(isc_session_t *sp)
{
pduq_t *pq;
nop_out_t *nop_out;
debug_called(8);
sdebug(4, "cws=%d", sp->cws);
if(sp->cws == 0) {
/*
| only send a nop if window is closed.
*/
if((pq = pdu_alloc(sp->isc, M_NOWAIT)) == NULL)
// I guess we ran out of resources
return;
nop_out = &pq->pdu.ipdu.nop_out;
nop_out->opcode = ISCSI_NOP_OUT;
nop_out->itt = htonl(sp->sn.itt);
nop_out->ttt = -1;
nop_out->I = 1;
nop_out->F = 1;
if(isc_qout(sp, pq) != 0) {
sdebug(1, "failed");
pdu_free(sp->isc, pq);
}
}
}
static void
_nop_in(isc_session_t *sp, pduq_t *pq)
{
pdu_t *pp = &pq->pdu;
nop_in_t *nop_in = &pp->ipdu.nop_in;
bhs_t *bhs = &pp->ipdu.bhs;
debug_called(8);
sdebug(5, "itt=%x ttt=%x", htonl(nop_in->itt), htonl(nop_in->ttt));
if(nop_in->itt == -1) {
if(pp->ds_len != 0) {
/*
| according to RFC 3720 this should be zero
| what to do if not?
*/
xdebug("%d] dslen not zero", sp->sid);
}
if(nop_in->ttt != -1) {
nop_out_t *nop_out;
/*
| target wants a nop_out
*/
bhs->opcode = ISCSI_NOP_OUT;
bhs->I = 1;
bhs->F = 1;
/*
| we are reusing the pdu, so bhs->ttt == nop_in->ttt;
| and need to zero out 'Reserved'
| small cludge here.
*/
nop_out = &pp->ipdu.nop_out;
nop_out->sn.maxcmd = 0;
memset(nop_out->mbz, 0, sizeof(nop_out->mbz));
(void)isc_qout(sp, pq); //XXX: should check return?
return;
}
//else {
// just making noise?
// see 10.9.1: target does not want and answer.
//}
} else
if(nop_in->ttt == -1) {
/*
| it is an answer to a nop_in from us
*/
if(nop_in->itt != -1) {
#ifdef ISC_WAIT4PING
// XXX: MUTEX please
if(sp->flags & ISC_WAIT4PING) {
i_nqueue_rsp(sp, pq);
wakeup(&sp->rsp);
return;
}
#endif
}
}
/*
| drop it
*/
pdu_free(sp->isc, pq);
return;
}
int
i_prepPDU(isc_session_t *sp, pduq_t *pq)
{
size_t len, n;
pdu_t *pp = &pq->pdu;
bhs_t *bhp = &pp->ipdu.bhs;
len = sizeof(bhs_t);
if(pp->ahs_len) {
len += pp->ahs_len;
bhp->AHSLength = pp->ahs_len / 4;
}
if(ISOK2DIG(sp->hdrDigest, pp))
len += 4;
if(pp->ds_len) {
n = pp->ds_len;
len += n;
#if BYTE_ORDER == LITTLE_ENDIAN
bhp->DSLength = ((n & 0x00ff0000) >> 16)
| (n & 0x0000ff00)
| ((n & 0x000000ff) << 16);
#else
bhp->DSLength = n;
#endif
if(len & 03) {
n = 4 - (len & 03);
len += n;
}
if(ISOK2DIG(sp->dataDigest, pp))
len += 4;
}
pq->len = len;
len -= sizeof(bhs_t);
if(sp->opt.maxBurstLength && (len > sp->opt.maxBurstLength)) {
xdebug("%d] pdu len=%zd > %d",
sp->sid, len, sp->opt.maxBurstLength);
// XXX: when this happens it used to hang ...
return E2BIG;
}
return 0;
}
int
isc_qout(isc_session_t *sp, pduq_t *pq)
{
int error = 0;
debug_called(8);
if(pq->len == 0 && (error = i_prepPDU(sp, pq)))
return error;
if(pq->pdu.ipdu.bhs.I)
i_nqueue_isnd(sp, pq);
else
if(pq->pdu.ipdu.data_out.opcode == ISCSI_WRITE_DATA)
i_nqueue_wsnd(sp, pq);
else
i_nqueue_csnd(sp, pq);
sdebug(5, "enqued: pq=%p", pq);
mtx_lock(&sp->io_mtx);
sp->flags |= ISC_OQNOTEMPTY;
if(sp->flags & ISC_OWAITING)
wakeup(&sp->flags);
mtx_unlock(&sp->io_mtx);
return error;
}
/*
| called when a fullPhase is restarted
*/
void
ism_restart(isc_session_t *sp)
{
int lastcmd;
sdebug(2, "restart ...");
lastcmd = iscsi_requeue(sp);
#if 0
if(lastcmd != sp->sn.cmd) {
sdebug(1, "resetting CmdSN to=%d (from %d)", lastcmd, sp->sn.cmd);
sp->sn.cmd = lastcmd;
}
#endif
mtx_lock(&sp->io_mtx);
if(sp->flags & ISC_OWAITING) {
wakeup(&sp->flags);
}
mtx_unlock(&sp->io_mtx);
sdebug(2, "restarted sn.cmd=0x%x lastcmd=0x%x", sp->sn.cmd, lastcmd);
}
void
ism_recv(isc_session_t *sp, pduq_t *pq)
{
bhs_t *bhs;
int statSN;
debug_called(8);
bhs = &pq->pdu.ipdu.bhs;
statSN = ntohl(bhs->OpcodeSpecificFields[1]);
#ifdef notyet
if(sp->sn.expCmd != sn->cmd) {
sdebug(1, "we lost something ... exp=0x%x cmd=0x%x",
sn->expCmd, sn->cmd);
}
#endif
sdebug(5, "opcode=0x%x itt=0x%x stat#0x%x maxcmd=0x%0x",
bhs->opcode, ntohl(bhs->itt), statSN, sp->sn.maxCmd);
switch(bhs->opcode) {
case ISCSI_READ_DATA: {
data_in_t *cmd = &pq->pdu.ipdu.data_in;
if(cmd->S == 0)
break;
}
default:
if(statSN > (sp->sn.stat + 1)) {
sdebug(1, "we lost some rec=0x%x exp=0x%x",
statSN, sp->sn.stat);
// XXX: must do some error recovery here.
}
sp->sn.stat = statSN;
}
switch(bhs->opcode) {
case ISCSI_LOGIN_RSP:
case ISCSI_TEXT_RSP:
case ISCSI_LOGOUT_RSP:
i_nqueue_rsp(sp, pq);
wakeup(&sp->rsp);
sdebug(3, "wakeup rsp");
break;
case ISCSI_NOP_IN: _nop_in(sp, pq); break;
case ISCSI_SCSI_RSP: _scsi_rsp(sp, pq); break;
case ISCSI_READ_DATA: _read_data(sp, pq); break;
case ISCSI_R2T: _r2t(sp, pq); break;
case ISCSI_REJECT: _reject(sp, pq); break;
case ISCSI_ASYNC: _async(sp, pq); break;
case ISCSI_TASK_RSP:
default:
sdebug(1, "opcode=0x%x itt=0x%x not implemented yet",
bhs->opcode, ntohl(bhs->itt));
break;
}
}
/*
| go through the out queues looking for work
| if either nothing to do, or window is closed
| return.
*/
static int
proc_out(isc_session_t *sp)
{
sn_t *sn = &sp->sn;
pduq_t *pq;
int error, which;
debug_called(8);
error = 0;
while(sp->flags & ISC_LINK_UP) {
pdu_t *pp;
bhs_t *bhs;
/*
| check if there is outstanding work in:
| 1- the Immediate queue
| 2- the R2T queue
| 3- the cmd queue, only if the command window allows it.
*/
which = BIT(0) | BIT(1);
if(SNA_GT(sn->cmd, sn->maxCmd) == 0) // if(sn->maxCmd - sn->smc + 1) > 0
which |= BIT(2);
sdebug(4, "which=%d sn->maxCmd=%d sn->cmd=%d", which, sn->maxCmd, sn->cmd);
if((pq = i_dqueue_snd(sp, which)) == NULL)
break;
sdebug(4, "pq=%p", pq);
pp = &pq->pdu;
bhs = &pp->ipdu.bhs;
switch(bhs->opcode) {
case ISCSI_SCSI_CMD:
sn->itt++;
bhs->itt = htonl(sn->itt);
case ISCSI_LOGIN_CMD:
case ISCSI_TEXT_CMD:
case ISCSI_LOGOUT_CMD:
case ISCSI_SNACK:
case ISCSI_NOP_OUT:
case ISCSI_TASK_CMD:
bhs->CmdSN = htonl(sn->cmd);
if(bhs->I == 0)
sn->cmd++;
case ISCSI_WRITE_DATA:
bhs->ExpStSN = htonl(sn->stat + 1);
break;
default:
// XXX: can this happen?
xdebug("bad opcode=0x%x sn(cmd=0x%x expCmd=0x%x maxCmd=0x%x expStat=0x%x itt=0x%x)",
bhs->opcode,
sn->cmd, sn->expCmd, sn->maxCmd, sn->expStat, sn->itt);
// XXX: and now?
}
sdebug(4, "opcode=0x%x sn(cmd=0x%x expCmd=0x%x maxCmd=0x%x expStat=0x%x itt=0x%x)",
bhs->opcode,
sn->cmd, sn->expCmd, sn->maxCmd, sn->expStat, sn->itt);
if(bhs->opcode != ISCSI_NOP_OUT)
/*
| enqued till ack is received
| note: sosend(...) does not mean the packet left
| the host so that freeing resources has to wait
*/
i_nqueue_hld(sp, pq);
error = isc_sendPDU(sp, pq);
if(bhs->opcode == ISCSI_NOP_OUT)
pdu_free(sp->isc, pq);
if(error) {
xdebug("error=%d opcode=0x%x ccb=%p itt=%x",
error, bhs->opcode, pq->ccb, ntohl(bhs->itt));
i_remove_hld(sp, pq);
switch(error) {
case EPIPE:
sp->flags &= ~ISC_LINK_UP;
case EAGAIN:
xdebug("requed");
i_rqueue_pdu(sp, pq);
break;
default:
if(pq->ccb) {
xdebug("back to cam");
pq->ccb->ccb_h.status |= CAM_REQUEUE_REQ; // some better error?
XPT_DONE(sp, pq->ccb);
pdu_free(sp->isc, pq);
}
else
xdebug("we lost it!");
}
}
}
return error;
}
/*
| survives link breakdowns.
*/
static void
ism_out(void *vp)
{
isc_session_t *sp = (isc_session_t *)vp;
int error;
debug_called(8);
sp->flags |= ISC_SM_RUNNING;
sdebug(3, "started sp->flags=%x", sp->flags);
do {
if((sp->flags & ISC_HOLD) == 0) {
error = proc_out(sp);
if(error) {
sdebug(3, "error=%d", error);
}
}
mtx_lock(&sp->io_mtx);
if((sp->flags & ISC_LINK_UP) == 0) {
sdebug(3, "ISC_LINK_UP==0, sp->flags=%x ", sp->flags);
if(sp->soc != NULL)
sdebug(3, "so_state=%x", sp->soc->so_state);
wakeup(&sp->soc);
}
if(!(sp->flags & ISC_OQNOTEMPTY)) {
sp->flags |= ISC_OWAITING;
if(msleep(&sp->flags, &sp->io_mtx, PRIBIO, "isc_proc", hz*30) == EWOULDBLOCK) {
if(sp->flags & ISC_CON_RUNNING)
_nop_out(sp);
}
sp->flags &= ~ISC_OWAITING;
}
sp->flags &= ~ISC_OQNOTEMPTY;
mtx_unlock(&sp->io_mtx);
} while(sp->flags & ISC_SM_RUN);
sp->flags &= ~ISC_SM_RUNNING;
sdebug(3, "dropped ISC_SM_RUNNING");
wakeup(&sp->soc);
wakeup(sp); // XXX: do we need this one?
#if __FreeBSD_version >= 700000
destroy_dev(sp->dev);
#endif
debug(3, "terminated sp=%p sp->sid=%d", sp, sp->sid);
#if __FreeBSD_version >= 800000
kproc_exit(0);
#else
kthread_exit(0);
#endif
}
#if 0
static int
isc_dump_options(SYSCTL_HANDLER_ARGS)
{
int error;
isc_session_t *sp;
char buf[1024], *bp;
sp = (isc_session_t *)arg1;
bp = buf;
sprintf(bp, "targetname='%s'", sp->opt.targetName);
bp += strlen(bp);
sprintf(bp, " targetname='%s'", sp->opt.targetAddress);
error = SYSCTL_OUT(req, buf, strlen(buf));
return error;
}
#endif
static int
isc_dump_stats(SYSCTL_HANDLER_ARGS)
{
isc_session_t *sp;
struct isc_softc *sc;
char buf[1024], *bp;
int error, n;
sp = (isc_session_t *)arg1;
sc = sp->isc;
bp = buf;
n = sizeof(buf);
snprintf(bp, n, "recv=%d sent=%d", sp->stats.nrecv, sp->stats.nsent);
bp += strlen(bp);
n -= strlen(bp);
snprintf(bp, n, " flags=0x%08x pdus-alloc=%d pdus-max=%d",
sp->flags, sc->npdu_alloc, sc->npdu_max);
bp += strlen(bp);
n -= strlen(bp);
snprintf(bp, n, " cws=%d cmd=%x exp=%x max=%x stat=%x itt=%x",
sp->cws, sp->sn.cmd, sp->sn.expCmd, sp->sn.maxCmd, sp->sn.stat, sp->sn.itt);
error = SYSCTL_OUT(req, buf, strlen(buf));
return error;
}
static int
isc_sysctl_targetName(SYSCTL_HANDLER_ARGS)
{
char buf[128], **cp;
int error;
cp = (char **)arg1;
snprintf(buf, sizeof(buf), "%s", *cp);
error = SYSCTL_OUT(req, buf, strlen(buf));
return error;
}
static int
isc_sysctl_targetAddress(SYSCTL_HANDLER_ARGS)
{
char buf[128], **cp;
int error;
cp = (char **)arg1;
snprintf(buf, sizeof(buf), "%s", *cp);
error = SYSCTL_OUT(req, buf, strlen(buf));
return error;
}
static void
isc_add_sysctls(isc_session_t *sp)
{
debug_called(8);
sdebug(6, "sid=%d %s", sp->sid, devtoname(sp->dev));
sysctl_ctx_init(&sp->clist);
sp->oid = SYSCTL_ADD_NODE(&sp->clist,
SYSCTL_CHILDREN(sp->isc->oid),
OID_AUTO,
devtoname(sp->dev) + 5, // iscsi0
CTLFLAG_RD,
0,
"initiator");
SYSCTL_ADD_PROC(&sp->clist,
SYSCTL_CHILDREN(sp->oid),
OID_AUTO,
"targetname",
CTLTYPE_STRING | CTLFLAG_RD,
(void *)&sp->opt.targetName, 0,
isc_sysctl_targetName, "A", "target name");
SYSCTL_ADD_PROC(&sp->clist,
SYSCTL_CHILDREN(sp->oid),
OID_AUTO,
"targeaddress",
CTLTYPE_STRING | CTLFLAG_RD,
(void *)&sp->opt.targetAddress, 0,
isc_sysctl_targetAddress, "A", "target address");
SYSCTL_ADD_PROC(&sp->clist,
SYSCTL_CHILDREN(sp->oid),
OID_AUTO,
"stats",
CTLTYPE_STRING | CTLFLAG_RD,
(void *)sp, 0,
isc_dump_stats, "A", "statistics");
SYSCTL_ADD_INT(&sp->clist,
SYSCTL_CHILDREN(sp->oid),
OID_AUTO,
"douio",
CTLFLAG_RW,
&sp->douio, 0, "enable uio on read");
}
void
ism_stop(isc_session_t *sp)
{
struct isc_softc *sc = sp->isc;
int n;
debug_called(8);
sdebug(2, "terminating");
/*
| first stop the receiver
*/
isc_stop_receiver(sp);
/*
| now stop the xmitter
*/
n = 5;
sp->flags &= ~ISC_SM_RUN;
while(n-- && (sp->flags & ISC_SM_RUNNING)) {
sdebug(2, "n=%d", n);
wakeup(&sp->flags);
tsleep(sp, PRIBIO, "-", 5*hz);
}
sdebug(2, "final n=%d", n);
sp->flags &= ~ISC_FFPHASE;
iscsi_cleanup(sp);
(void)i_pdu_flush(sp);
ic_destroy(sp);
sx_xlock(&sc->unit_sx);
free_unr(sc->unit, sp->sid);
sx_xunlock(&sc->unit_sx);
mtx_lock(&sc->isc_mtx);
TAILQ_REMOVE(&sc->isc_sess, sp, sp_link);
sc->nsess--;
mtx_unlock(&sc->isc_mtx);
#if __FreeBSD_version < 700000
destroy_dev(sp->dev);
#endif
mtx_destroy(&sp->rsp_mtx);
mtx_destroy(&sp->rsv_mtx);
mtx_destroy(&sp->hld_mtx);
mtx_destroy(&sp->snd_mtx);
mtx_destroy(&sp->io_mtx);
i_freeopt(&sp->opt);
if(sysctl_ctx_free(&sp->clist))
xdebug("sysctl_ctx_free failed");
free(sp, M_ISCSI);
}
int
ism_start(isc_session_t *sp)
{
debug_called(8);
/*
| now is a good time to do some initialization
*/
TAILQ_INIT(&sp->rsp);
TAILQ_INIT(&sp->rsv);
TAILQ_INIT(&sp->csnd);
TAILQ_INIT(&sp->isnd);
TAILQ_INIT(&sp->wsnd);
TAILQ_INIT(&sp->hld);
mtx_init(&sp->rsv_mtx, "iscsi-rsv", NULL, MTX_DEF);
mtx_init(&sp->rsp_mtx, "iscsi-rsp", NULL, MTX_DEF);
mtx_init(&sp->snd_mtx, "iscsi-snd", NULL, MTX_DEF);
mtx_init(&sp->hld_mtx, "iscsi-hld", NULL, MTX_DEF);
mtx_init(&sp->io_mtx, "iscsi-io", NULL, MTX_DEF);
isc_add_sysctls(sp);
sp->flags |= ISC_SM_RUN;
debug(4, "starting ism_proc: sp->sid=%d", sp->sid);
#if __FreeBSD_version >= 800000
return kproc_create(ism_out, sp, &sp->stp, 0, 0, "isc_out %d", sp->sid);
#else
return kthread_create(ism_out, sp, &sp->stp, 0, 0, "isc_out %d", sp->sid);
#endif
}
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