d/freebsd-nq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
freebsd-nq/sys/dev/iscsi_initiator/iscsi.c
Hans Petter Selasky 3da1cf1e88 Extend the meaning of the CTLFLAG_TUN flag to automatically check if 
there is an environment variable which shall initialize the SYSCTL
during early boot. This works for all SYSCTL types both statically and
dynamically created ones, except for the SYSCTL NODE type and SYSCTLs
which belong to VNETs. A new flag, CTLFLAG_NOFETCH, has been added to
be used in the case a tunable sysctl has a custom initialisation
function allowing the sysctl to still be marked as a tunable. The
kernel SYSCTL API is mostly the same, with a few exceptions for some
special operations like iterating childrens of a static/extern SYSCTL
node. This operation should probably be made into a factored out
common macro, hence some device drivers use this. The reason for
changing the SYSCTL API was the need for a SYSCTL parent OID pointer
and not only the SYSCTL parent OID list pointer in order to quickly
generate the sysctl path. The motivation behind this patch is to avoid
parameter loading cludges inside the OFED driver subsystem. Instead of
adding special code to the OFED driver subsystem to post-load tunables
into dynamically created sysctls, we generalize this in the kernel.

Other changes:
- Corrected a possibly incorrect sysctl name from "hw.cbb.intr_mask"
to "hw.pcic.intr_mask".
- Removed redundant TUNABLE statements throughout the kernel.
- Some minor code rewrites in connection to removing not needed
TUNABLE statements.
- Added a missing SYSCTL_DECL().
- Wrapped two very long lines.
- Avoid malloc()/free() inside sysctl string handling, in case it is
called to initialize a sysctl from a tunable, hence malloc()/free() is
not ready when sysctls from the sysctl dataset are registered.
- Bumped FreeBSD version to indicate SYSCTL API change.

MFC after:	2 weeks
Sponsored by:	Mellanox Technologies
2014-06-27 16:33:43 +00:00

885 lines
21 KiB
C
Raw Blame History

/*-
* Copyright (c) 2005-2011 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.
*
*/
/*
| $Id: iscsi.c 752 2009-08-20 11:23:28Z danny $
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_iscsi_initiator.h"
#include <sys/param.h>
#include <sys/capsicum.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/conf.h>
#include <sys/bus.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/mbuf.h>
#include <sys/syslog.h>
#include <vm/uma.h>
#include <sys/sx.h>
#include <dev/iscsi_initiator/iscsi.h>
#include <dev/iscsi_initiator/iscsivar.h>
static char *iscsi_driver_version = "2.3.1";
static struct isc_softc *isc;
MALLOC_DEFINE(M_ISCSI, "iSCSI", "iSCSI driver");
MALLOC_DEFINE(M_ISCSIBUF, "iSCbuf", "iSCSI buffers");
static MALLOC_DEFINE(M_TMP, "iSCtmp", "iSCSI tmp");
#ifdef ISCSI_INITIATOR_DEBUG
int iscsi_debug = ISCSI_INITIATOR_DEBUG;
SYSCTL_INT(_debug, OID_AUTO, iscsi_initiator, CTLFLAG_RW, &iscsi_debug, 0,
"iSCSI driver debug flag");
struct mtx iscsi_dbg_mtx;
#endif
static int max_sessions = MAX_SESSIONS;
SYSCTL_INT(_net, OID_AUTO, iscsi_initiator_max_sessions, CTLFLAG_RDTUN,
&max_sessions, 0, "Max sessions allowed");
static int max_pdus = MAX_PDUS;
SYSCTL_INT(_net, OID_AUTO, iscsi_initiator_max_pdus, CTLFLAG_RDTUN,
&max_pdus, 0, "Max PDU pool");
static char isid[6+1] = {
0x80,
'D',
'I',
'B',
'0',
'0',
0
};
static int i_create_session(struct cdev *dev, int *ndev);
static int i_ping(struct cdev *dev);
static int i_send(struct cdev *dev, caddr_t arg, struct thread *td);
static int i_recv(struct cdev *dev, caddr_t arg, struct thread *td);
static int i_setsoc(isc_session_t *sp, int fd, struct thread *td);
static int i_fullfeature(struct cdev *dev, int flag);
static d_open_t iscsi_open;
static d_close_t iscsi_close;
static d_ioctl_t iscsi_ioctl;
#ifdef ISCSI_INITIATOR_DEBUG
static d_read_t iscsi_read;
#endif
static struct cdevsw iscsi_cdevsw = {
.d_version = D_VERSION,
.d_open = iscsi_open,
.d_close = iscsi_close,
.d_ioctl = iscsi_ioctl,
#ifdef ISCSI_INITIATOR_DEBUG
.d_read = iscsi_read,
#endif
.d_name = "iSCSI",
};
static int
iscsi_open(struct cdev *dev, int flags, int otype, struct thread *td)
{
debug_called(8);
debug(7, "dev=%d", dev2unit(dev));
if(dev2unit(dev) > max_sessions) {
// should not happen
return ENODEV;
}
return 0;
}
static int
iscsi_close(struct cdev *dev, int flag, int otyp, struct thread *td)
{
isc_session_t *sp;
debug_called(8);
debug(3, "session=%d flag=%x", dev2unit(dev), flag);
if(dev2unit(dev) == max_sessions) {
return 0;
}
sp = dev->si_drv2;
if(sp != NULL) {
sdebug(3, "sp->flags=%x", sp->flags );
/*
| if still in full phase, this probably means
| that something went realy bad.
| it could be a result from 'shutdown', in which case
| we will ignore it (so buffers can be flushed).
| the problem is that there is no way of differentiating
| between a shutdown procedure and 'iscontrol' dying.
*/
if(sp->flags & ISC_FFPHASE)
// delay in case this is a shutdown.
tsleep(sp, PRIBIO, "isc-cls", 60*hz);
ism_stop(sp);
}
debug(2, "done");
return 0;
}
static int
iscsi_ioctl(struct cdev *dev, u_long cmd, caddr_t arg, int mode, struct thread *td)
{
struct isc_softc *sc;
isc_session_t *sp;
isc_opt_t *opt;
int error;
debug_called(8);
error = 0;
if(dev2unit(dev) == max_sessions) {
/*
| non Session commands
*/
sc = dev->si_drv1;
if(sc == NULL)
return ENXIO;
switch(cmd) {
case ISCSISETSES:
error = i_create_session(dev, (int *)arg);
if(error == 0)
break;
default:
error = ENXIO;
}
return error;
}
/*
| session commands
*/
sp = dev->si_drv2;
if(sp == NULL)
return ENXIO;
sdebug(6, "dev=%d cmd=%d", dev2unit(dev), (int)(cmd & 0xff));
switch(cmd) {
case ISCSISETSOC:
error = i_setsoc(sp, *(u_int *)arg, td);
break;
case ISCSISETOPT:
opt = (isc_opt_t *)arg;
error = i_setopt(sp, opt);
break;
case ISCSISEND:
error = i_send(dev, arg, td);
break;
case ISCSIRECV:
error = i_recv(dev, arg, td);
break;
case ISCSIPING:
error = i_ping(dev);
break;
case ISCSISTART:
error = sp->soc == NULL? ENOTCONN: i_fullfeature(dev, 1);
if(error == 0) {
sp->proc = td->td_proc;
SYSCTL_ADD_INT(&sp->clist, SYSCTL_CHILDREN(sp->oid),
OID_AUTO, "pid", CTLFLAG_RD,
&sp->proc->p_pid, sizeof(pid_t), "control process id");
}
break;
case ISCSIRESTART:
error = sp->soc == NULL? ENOTCONN: i_fullfeature(dev, 2);
break;
case ISCSISTOP:
error = i_fullfeature(dev, 0);
break;
case ISCSISIGNAL: {
int sig = *(int *)arg;
if(sig < 0 || sig > _SIG_MAXSIG)
error = EINVAL;
else
sp->signal = sig;
break;
}
case ISCSIGETCAM: {
iscsi_cam_t *cp = (iscsi_cam_t *)arg;
error = ic_getCamVals(sp, cp);
break;
}
default:
error = ENOIOCTL;
}
return error;
}
static int
iscsi_read(struct cdev *dev, struct uio *uio, int ioflag)
{
#ifdef ISCSI_INITIATOR_DEBUG
struct isc_softc *sc;
isc_session_t *sp;
pduq_t *pq;
char buf[1024];
sc = dev->si_drv1;
sp = dev->si_drv2;
if(dev2unit(dev) == max_sessions) {
sprintf(buf, "/----- Session ------/\n");
uiomove(buf, strlen(buf), uio);
int i = 0;
TAILQ_FOREACH(sp, &sc->isc_sess, sp_link) {
if(uio->uio_resid == 0)
return 0;
sprintf(buf, "%03d] '%s' '%s'\n", i++, sp->opt.targetAddress, sp->opt.targetName);
uiomove(buf, strlen(buf), uio);
}
sprintf(buf, "free npdu_alloc=%d, npdu_max=%d\n", sc->npdu_alloc, sc->npdu_max);
uiomove(buf, strlen(buf), uio);
}
else {
int i = 0;
struct socket *so = sp->soc;
#define pukeit(i, pq) do {\
sprintf(buf, "%03d] %06x %02x %06x %06x %jd\n",\
i, ntohl(pq->pdu.ipdu.bhs.CmdSN),\
pq->pdu.ipdu.bhs.opcode, ntohl(pq->pdu.ipdu.bhs.itt),\
ntohl(pq->pdu.ipdu.bhs.ExpStSN),\
(intmax_t)pq->ts.sec);\
} while(0)
sprintf(buf, "%d/%d /---- hld -----/\n", sp->stats.nhld, sp->stats.max_hld);
uiomove(buf, strlen(buf), uio);
TAILQ_FOREACH(pq, &sp->hld, pq_link) {
if(uio->uio_resid == 0)
return 0;
pukeit(i, pq); i++;
uiomove(buf, strlen(buf), uio);
}
sprintf(buf, "%d/%d /---- rsp -----/\n", sp->stats.nrsp, sp->stats.max_rsp);
uiomove(buf, strlen(buf), uio);
i = 0;
TAILQ_FOREACH(pq, &sp->rsp, pq_link) {
if(uio->uio_resid == 0)
return 0;
pukeit(i, pq); i++;
uiomove(buf, strlen(buf), uio);
}
sprintf(buf, "%d/%d /---- csnd -----/\n", sp->stats.ncsnd, sp->stats.max_csnd);
i = 0;
uiomove(buf, strlen(buf), uio);
TAILQ_FOREACH(pq, &sp->csnd, pq_link) {
if(uio->uio_resid == 0)
return 0;
pukeit(i, pq); i++;
uiomove(buf, strlen(buf), uio);
}
sprintf(buf, "%d/%d /---- wsnd -----/\n", sp->stats.nwsnd, sp->stats.max_wsnd);
i = 0;
uiomove(buf, strlen(buf), uio);
TAILQ_FOREACH(pq, &sp->wsnd, pq_link) {
if(uio->uio_resid == 0)
return 0;
pukeit(i, pq); i++;
uiomove(buf, strlen(buf), uio);
}
sprintf(buf, "%d/%d /---- isnd -----/\n", sp->stats.nisnd, sp->stats.max_isnd);
i = 0;
uiomove(buf, strlen(buf), uio);
TAILQ_FOREACH(pq, &sp->isnd, pq_link) {
if(uio->uio_resid == 0)
return 0;
pukeit(i, pq); i++;
uiomove(buf, strlen(buf), uio);
}
sprintf(buf, "/---- Stats ---/\n");
uiomove(buf, strlen(buf), uio);
sprintf(buf, "recv=%d sent=%d\n", sp->stats.nrecv, sp->stats.nsent);
uiomove(buf, strlen(buf), uio);
sprintf(buf, "flags=%x pdus: alloc=%d max=%d\n",
sp->flags, sc->npdu_alloc, sc->npdu_max);
uiomove(buf, strlen(buf), uio);
sprintf(buf, "cws=%d last cmd=%x exp=%x max=%x stat=%x itt=%x\n",
sp->cws, sp->sn.cmd, sp->sn.expCmd, sp->sn.maxCmd, sp->sn.stat, sp->sn.itt);
uiomove(buf, strlen(buf), uio);
sprintf(buf, "/---- socket -----/\nso_count=%d so_state=%x\n", so->so_count, so->so_state);
uiomove(buf, strlen(buf), uio);
}
#endif
return 0;
}
static int
i_ping(struct cdev *dev)
{
return 0;
}
/*
| low level I/O
*/
static int
i_setsoc(isc_session_t *sp, int fd, struct thread *td)
{
cap_rights_t rights;
int error = 0;
if(sp->soc != NULL)
isc_stop_receiver(sp);
error = fget(td, fd, cap_rights_init(&rights, CAP_SOCK_CLIENT), &sp->fp);
if(error)
return error;
error = fgetsock(td, fd, cap_rights_init(&rights, CAP_SOCK_CLIENT),
&sp->soc, 0);
if(error == 0) {
sp->td = td;
isc_start_receiver(sp);
}
else {
fdrop(sp->fp, td);
sp->fp = NULL;
}
return error;
}
static int
i_send(struct cdev *dev, caddr_t arg, struct thread *td)
{
isc_session_t *sp = dev->si_drv2;
caddr_t bp;
pduq_t *pq;
pdu_t *pp;
int n, error;
debug_called(8);
if(sp->soc == NULL)
return ENOTCONN;
if((pq = pdu_alloc(sp->isc, M_NOWAIT)) == NULL)
return EAGAIN;
pp = &pq->pdu;
pq->pdu = *(pdu_t *)arg;
if((error = i_prepPDU(sp, pq)) != 0)
goto out;
bp = NULL;
if((pq->len - sizeof(union ipdu_u)) > 0) {
pq->buf = bp = malloc(pq->len - sizeof(union ipdu_u), M_ISCSIBUF, M_NOWAIT);
if(pq->buf == NULL) {
error = EAGAIN;
goto out;
}
}
else
pq->buf = NULL; // just in case?
sdebug(2, "len=%d ahs_len=%d ds_len=%d buf=%zu@%p",
pq->len, pp->ahs_len, pp->ds_len, pq->len - sizeof(union ipdu_u), bp);
if(pp->ahs_len) {
// XXX: never tested, looks suspicious
n = pp->ahs_len;
error = copyin(pp->ahs_addr, bp, n);
if(error != 0) {
sdebug(3, "copyin ahs: error=%d", error);
goto out;
}
pp->ahs_addr = (ahs_t *)bp;
bp += n;
}
if(pp->ds_len) {
n = pp->ds_len;
error = copyin(pp->ds_addr, bp, n);
if(error != 0) {
sdebug(3, "copyin ds: error=%d", error);
goto out;
}
pp->ds_addr = bp;
bp += n;
while(n & 03) {
n++;
*bp++ = 0;
}
}
error = isc_qout(sp, pq);
if(error == 0)
wakeup(&sp->flags); // XXX: to 'push' proc_out ...
out:
if(error)
pdu_free(sp->isc, pq);
return error;
}
static int
i_recv(struct cdev *dev, caddr_t arg, struct thread *td)
{
isc_session_t *sp = dev->si_drv2;
pduq_t *pq;
pdu_t *pp, *up;
caddr_t bp;
int error, mustfree, cnt;
size_t need, have, n;
debug_called(8);
if(sp == NULL)
return EIO;
if(sp->soc == NULL)
return ENOTCONN;
cnt = 6; // XXX: maybe the user can request a time out?
mtx_lock(&sp->rsp_mtx);
while((pq = TAILQ_FIRST(&sp->rsp)) == NULL) {
msleep(&sp->rsp, &sp->rsp_mtx, PRIBIO, "isc_rsp", hz*10);
if(cnt-- == 0) break; // XXX: for now, needs work
}
if(pq != NULL) {
sp->stats.nrsp--;
TAILQ_REMOVE(&sp->rsp, pq, pq_link);
}
mtx_unlock(&sp->rsp_mtx);
sdebug(6, "cnt=%d", cnt);
if(pq == NULL) {
error = ENOTCONN;
sdebug(3, "error=%d sp->flags=%x ", error, sp->flags);
return error;
}
up = (pdu_t *)arg;
pp = &pq->pdu;
up->ipdu = pp->ipdu;
n = 0;
up->ds_len = 0;
up->ahs_len = 0;
error = 0;
if(pq->mp) {
u_int len;
// Grr...
len = 0;
if(pp->ahs_len) {
len += pp->ahs_len;
}
if(pp->ds_len) {
len += pp->ds_len;
}
mustfree = 0;
if(len > pq->mp->m_len) {
mustfree++;
bp = malloc(len, M_TMP, M_WAITOK);
sdebug(4, "need mbufcopy: %d", len);
i_mbufcopy(pq->mp, bp, len);
}
else
bp = mtod(pq->mp, caddr_t);
if(pp->ahs_len) {
need = pp->ahs_len;
n = MIN(up->ahs_size, need);
error = copyout(bp, (caddr_t)up->ahs_addr, n);
up->ahs_len = n;
bp += need;
}
if(!error && pp->ds_len) {
need = pp->ds_len;
if((have = up->ds_size) == 0) {
have = up->ahs_size - n;
up->ds_addr = (caddr_t)up->ahs_addr + n;
}
n = MIN(have, need);
error = copyout(bp, (caddr_t)up->ds_addr, n);
up->ds_len = n;
}
if(mustfree)
free(bp, M_TMP);
}
sdebug(6, "len=%d ahs_len=%d ds_len=%d", pq->len, pp->ahs_len, pp->ds_len);
pdu_free(sp->isc, pq);
return error;
}
static int
i_fullfeature(struct cdev *dev, int flag)
{
isc_session_t *sp = dev->si_drv2;
int error;
sdebug(2, "flag=%d", flag);
error = 0;
switch(flag) {
case 0: // stop
sp->flags &= ~ISC_FFPHASE;
break;
case 1: // start
sp->flags |= ISC_FFPHASE;
error = ic_init(sp);
break;
case 2: // restart
sp->flags |= ISC_FFPHASE;
ism_restart(sp);
break;
}
return error;
}
static int
i_create_session(struct cdev *dev, int *ndev)
{
struct isc_softc *sc = dev->si_drv1;
isc_session_t *sp;
int error, n;
debug_called(8);
sp = malloc(sizeof(isc_session_t), M_ISCSI, M_WAITOK | M_ZERO);
if(sp == NULL)
return ENOMEM;
sx_xlock(&sc->unit_sx);
if((n = alloc_unr(sc->unit)) < 0) {
sx_unlock(&sc->unit_sx);
free(sp, M_ISCSI);
xdebug("too many sessions!");
return EPERM;
}
sx_unlock(&sc->unit_sx);
mtx_lock(&sc->isc_mtx);
TAILQ_INSERT_TAIL(&sc->isc_sess, sp, sp_link);
isc->nsess++;
mtx_unlock(&sc->isc_mtx);
sp->dev = make_dev(&iscsi_cdevsw, n, UID_ROOT, GID_WHEEL, 0600, "iscsi%d", n);
*ndev = sp->sid = n;
sp->isc = sc;
sp->dev->si_drv1 = sc;
sp->dev->si_drv2 = sp;
sp->opt.maxRecvDataSegmentLength = 8192;
sp->opt.maxXmitDataSegmentLength = 8192;
sp->opt.maxBurstLength = 65536; // 64k
sp->opt.maxluns = ISCSI_MAX_LUNS;
error = ism_start(sp);
return error;
}
#ifdef notused
static void
iscsi_counters(isc_session_t *sp)
{
int h, r, s;
pduq_t *pq;
#define _puke(i, pq) do {\
debug(2, "%03d] %06x %02x %x %ld %jd %x\n",\
i, ntohl( pq->pdu.ipdu.bhs.CmdSN), \
pq->pdu.ipdu.bhs.opcode, ntohl(pq->pdu.ipdu.bhs.itt),\
(long)pq->ts.sec, pq->ts.frac, pq->flags);\
} while(0)
h = r = s = 0;
TAILQ_FOREACH(pq, &sp->hld, pq_link) {
_puke(h, pq);
h++;
}
TAILQ_FOREACH(pq, &sp->rsp, pq_link) r++;
TAILQ_FOREACH(pq, &sp->csnd, pq_link) s++;
TAILQ_FOREACH(pq, &sp->wsnd, pq_link) s++;
TAILQ_FOREACH(pq, &sp->isnd, pq_link) s++;
debug(2, "hld=%d rsp=%d snd=%d", h, r, s);
}
#endif
static void
iscsi_shutdown(void *v)
{
struct isc_softc *sc = v;
isc_session_t *sp;
int n;
debug_called(8);
if(sc == NULL) {
xdebug("sc is NULL!");
return;
}
#ifdef DO_EVENTHANDLER
if(sc->eh == NULL)
debug(2, "sc->eh is NULL");
else {
EVENTHANDLER_DEREGISTER(shutdown_pre_sync, sc->eh);
debug(2, "done n=%d", sc->nsess);
}
#endif
n = 0;
TAILQ_FOREACH(sp, &sc->isc_sess, sp_link) {
debug(2, "%2d] sp->flags=0x%08x", n, sp->flags);
n++;
}
debug(2, "done");
}
static void
free_pdus(struct isc_softc *sc)
{
debug_called(8);
if(sc->pdu_zone != NULL) {
uma_zdestroy(sc->pdu_zone);
sc->pdu_zone = NULL;
}
}
static int
iscsi_start(void)
{
debug_called(8);
isc = malloc(sizeof(struct isc_softc), M_ISCSI, M_ZERO|M_WAITOK);
mtx_init(&isc->isc_mtx, "iscsi-isc", NULL, MTX_DEF);
TAILQ_INIT(&isc->isc_sess);
/*
| now init the free pdu list
*/
isc->pdu_zone = uma_zcreate("pdu", sizeof(pduq_t),
NULL, NULL, NULL, NULL,
0, 0);
uma_zone_set_max(isc->pdu_zone, max_pdus);
isc->unit = new_unrhdr(0, max_sessions-1, NULL);
sx_init(&isc->unit_sx, "iscsi sx");
#ifdef DO_EVENTHANDLER
if((isc->eh = EVENTHANDLER_REGISTER(shutdown_pre_sync, iscsi_shutdown,
sc, SHUTDOWN_PRI_DEFAULT-1)) == NULL)
xdebug("shutdown event registration failed\n");
#endif
/*
| sysctl stuff
*/
sysctl_ctx_init(&isc->clist);
isc->oid = SYSCTL_ADD_NODE(&isc->clist,
SYSCTL_STATIC_CHILDREN(_net),
OID_AUTO,
"iscsi_initiator",
CTLFLAG_RD,
0,
"iSCSI Subsystem");
SYSCTL_ADD_STRING(&isc->clist,
SYSCTL_CHILDREN(isc->oid),
OID_AUTO,
"driver_version",
CTLFLAG_RD,
iscsi_driver_version,
0,
"iscsi driver version");
SYSCTL_ADD_STRING(&isc->clist,
SYSCTL_CHILDREN(isc->oid),
OID_AUTO,
"isid",
CTLFLAG_RW,
isid,
6+1,
"initiator part of the Session Identifier");
SYSCTL_ADD_INT(&isc->clist,
SYSCTL_CHILDREN(isc->oid),
OID_AUTO,
"sessions",
CTLFLAG_RD,
&isc->nsess,
sizeof(isc->nsess),
"number of active session");
#ifdef ISCSI_INITIATOR_DEBUG
mtx_init(&iscsi_dbg_mtx, "iscsi_dbg", NULL, MTX_DEF);
#endif
isc->dev = make_dev_credf(MAKEDEV_CHECKNAME, &iscsi_cdevsw, max_sessions,
NULL, UID_ROOT, GID_WHEEL, 0600, "iscsi");
if (isc->dev == NULL) {
xdebug("iscsi_initiator: make_dev_credf failed");
return (EEXIST);
}
isc->dev->si_drv1 = isc;
printf("iscsi: version %s\n", iscsi_driver_version);
return (0);
}
/*
| Notes:
| unload SHOULD fail if there is activity
| activity: there is/are active session/s
*/
static void
iscsi_stop(void)
{
isc_session_t *sp, *sp_tmp;
debug_called(8);
/*
| go through all the sessions
| Note: close should have done this ...
*/
TAILQ_FOREACH_SAFE(sp, &isc->isc_sess, sp_link, sp_tmp) {
//XXX: check for activity ...
ism_stop(sp);
if(sp->cam_sim != NULL)
ic_destroy(sp);
}
mtx_destroy(&isc->isc_mtx);
sx_destroy(&isc->unit_sx);
free_pdus(isc);
if(isc->dev)
destroy_dev(isc->dev);
if(sysctl_ctx_free(&isc->clist))
xdebug("sysctl_ctx_free failed");
iscsi_shutdown(isc); // XXX: check EVENTHANDLER_ ...
#ifdef ISCSI_INITIATOR_DEBUG
mtx_destroy(&iscsi_dbg_mtx);
#endif
free(isc, M_ISCSI);
}
static int
iscsi_modevent(module_t mod, int what, void *arg)
{
int error = 0;
debug_called(8);
switch(what) {
case MOD_LOAD:
error = iscsi_start();
break;
case MOD_QUIESCE:
if(isc->nsess) {
xdebug("iscsi module busy(nsess=%d), cannot unload", isc->nsess);
log(LOG_ERR, "iscsi module busy, cannot unload");
}
return isc->nsess;
case MOD_SHUTDOWN:
break;
case MOD_UNLOAD:
iscsi_stop();
break;
default:
break;
}
return (error);
}
moduledata_t iscsi_mod = {
"iscsi_initiator",
(modeventhand_t) iscsi_modevent,
0
};
#ifdef ISCSI_ROOT
static void
iscsi_rootconf(void)
{
#if 0
nfs_setup_diskless();
if (nfs_diskless_valid)
rootdevnames[0] = "nfs:";
#endif
printf("** iscsi_rootconf **\n");
}
SYSINIT(cpu_rootconf1, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, iscsi_rootconf, NULL)
#endif
DECLARE_MODULE(iscsi_initiator, iscsi_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
MODULE_DEPEND(iscsi_initiator, cam, 1, 1, 1);
Reference in New Issue View Git Blame Copy Permalink