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/* $netBSD: iscsi_main.c,v 1.1.1.1 2011/05/02 07:01:11 agc Exp $ */
/*-
* Copyright (c) 2004,2005,2006,2011 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Wasabi Systems, Inc.
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
#include "iscsi_globals.h"
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/kmem.h>
#include <sys/socketvar.h>
/*------------------------- Global Variables ------------------------*/
extern struct cfdriver iscsi_cd;
#if defined(ISCSI_DEBUG)
int iscsi_debug_level = ISCSI_DEBUG;
#endif
#if defined(ISCSI_PERFTEST)
int iscsi_perf_level = 0;
#endif
/* Device Structure */
iscsi_softc_t *sc = NULL;
/* the list of sessions */
session_list_t iscsi_sessions = TAILQ_HEAD_INITIALIZER(iscsi_sessions);
/* connections to clean up */
connection_list_t iscsi_cleanupc_list = TAILQ_HEAD_INITIALIZER(iscsi_cleanupc_list);
session_list_t iscsi_cleanups_list = TAILQ_HEAD_INITIALIZER(iscsi_cleanups_list);
bool iscsi_detaching = FALSE;
struct lwp *iscsi_cleanproc = NULL;
/* the number of active send threads (for cleanup thread) */
uint32_t iscsi_num_send_threads = 0;
/* Our node name, alias, and ISID */
uint8_t iscsi_InitiatorName[ISCSI_STRING_LENGTH] = "";
uint8_t iscsi_InitiatorAlias[ISCSI_STRING_LENGTH] = "";
login_isid_t iscsi_InitiatorISID;
/******************************************************************************/
/*
System interface: autoconf and device structures
*/
void iscsiattach(int);
static void iscsi_attach(device_t parent, device_t self, void *aux);
static int iscsi_match(device_t, cfdata_t, void *);
static int iscsi_detach(device_t, int);
CFATTACH_DECL_NEW(iscsi, sizeof(struct iscsi_softc), iscsi_match, iscsi_attach,
iscsi_detach, NULL);
static dev_type_open(iscsiopen);
static dev_type_close(iscsiclose);
struct cdevsw iscsi_cdevsw = {
iscsiopen, iscsiclose,
noread, nowrite,
iscsiioctl, nostop, notty, nopoll, nommap, nokqfilter, D_OTHER
};
/******************************************************************************/
STATIC void iscsi_scsipi_request(struct scsipi_channel *,
scsipi_adapter_req_t, void *);
STATIC void iscsi_minphys(struct buf *);
/******************************************************************************/
/*******************************************************************************
* Open and Close device interfaces. We don't really need them, because we don't
* have to keep track of device opens and closes from userland. But apps can't
* call ioctl without a handle to the device, and the kernel doesn't hand out
* handles without an open routine in the driver. So here they are in all their
* glory...
*******************************************************************************/
int
iscsiopen(dev_t dev, int flag, int mode, PTHREADOBJ p)
{
DEB(99, ("ISCSI Open\n"));
return 0;
}
int
iscsiclose(dev_t dev, int flag, int mode, PTHREADOBJ p)
{
DEB(99, ("ISCSI Close\n"));
return 0;
}
/******************************************************************************/
/*
* The config Match routine.
* Not much to do here, either - this is a pseudo-device.
*/
static int
iscsi_match(device_t self, cfdata_t cfdata, void *arg)
{
return 1;
}
/*
* iscsiattach:
* Only called when statically configured into a kernel
*/
void
iscsiattach(int n)
{
int err;
cfdata_t cf;
err = config_cfattach_attach(iscsi_cd.cd_name, &iscsi_ca);
if (err) {
aprint_error("%s: couldn't register cfattach: %d\n",
iscsi_cd.cd_name, err);
config_cfdriver_detach(&iscsi_cd);
return;
}
if (n > 1)
aprint_error("%s: only one device supported\n",
iscsi_cd.cd_name);
cf = kmem_alloc(sizeof(struct cfdata), KM_NOSLEEP);
if (cf == NULL) {
aprint_error("%s: couldn't allocate cfdata\n",
iscsi_cd.cd_name);
return;
}
cf->cf_name = iscsi_cd.cd_name;
cf->cf_atname = iscsi_cd.cd_name;
cf->cf_unit = 0;
cf->cf_fstate = FSTATE_NOTFOUND;
(void)config_attach_pseudo(cf);
return;
}
/*
* iscsi_attach:
* One-time inits go here. Not much for now, probably even less later.
*/
static void
iscsi_attach(device_t parent, device_t self, void *aux)
{
DEBOUT(("ISCSI: iscsi_attach, parent=%p, self=%p, aux=%p\n", parent,
self, aux));
sc = (iscsi_softc_t *) device_private(self);
sc->sc_dev = self;
if (kthread_create(PRI_NONE, 0, NULL, iscsi_cleanup_thread,
NULL, &iscsi_cleanproc, "Cleanup") != 0) {
panic("Can't create cleanup thread!");
}
aprint_normal("%s: attached. major = %d\n", iscsi_cd.cd_name,
cdevsw_lookup_major(&iscsi_cdevsw));
}
/*
* iscsi_detach:
* Cleanup.
*/
static int
iscsi_detach(device_t self, int flags)
{
DEBOUT(("ISCSI: detach\n"));
kill_all_sessions();
iscsi_detaching = TRUE;
while (iscsi_cleanproc != NULL) {
wakeup(&iscsi_cleanupc_list);
tsleep(&iscsi_cleanupc_list, PWAIT, "detach_wait", 20 * hz);
}
return 0;
}
/******************************************************************************/
typedef struct quirktab_t {
const char *tgt;
size_t tgtlen;
const char *iqn;
size_t iqnlen;
uint32_t quirks;
} quirktab_t;
static const quirktab_t quirktab[] = {
{ "StarWind", 8,
"iqn.2008-08.com.starwindsoftware", 32,
PQUIRK_ONLYBIG },
{ "UNH", 3,
"iqn.2002-10.edu.unh.", 20,
PQUIRK_NOBIGMODESENSE |
PQUIRK_NOMODESENSE |
PQUIRK_NOSYNCCACHE },
{ "NetBSD", 6,
"iqn.1994-04.org.netbsd.", 23,
0 },
{ "Unknown", 7,
"unknown", 7,
0 },
{ NULL, 0, NULL, 0, 0 }
};
/* loop through the quirktab looking for a match on target name */
static const quirktab_t *
getquirks(const char *iqn)
{
const quirktab_t *qp;
if (iqn == NULL) {
iqn = "unknown";
}
for (qp = quirktab ; qp->iqn ; qp++) {
if (strncmp(qp->iqn, iqn, qp->iqnlen) == 0) {
break;
}
}
return qp;
}
/******************************************************************************/
/*
* map_session
* This (indirectly) maps the existing LUNs for a target to SCSI devices
* by going through config_found to tell any child drivers that there's
* a new adapter.
* Note that each session is equivalent to a SCSI adapter.
*
* Parameter: the session pointer
*
* Returns: 1 on success, 0 on failure
*
* ToDo: Figuring out how to handle more than one LUN. It appears that
* the NetBSD SCSI LUN discovery doesn't use "report LUNs", and instead
* goes through the LUNs sequentially, stopping somewhere on the way if it
* gets an error. We may have to do some LUN mapping in here if this is
* really how things work.
*/
int
map_session(session_t *session)
{
struct scsipi_adapter *adapt = &session->sc_adapter;
struct scsipi_channel *chan = &session->sc_channel;
const quirktab_t *tgt;
if (sc == NULL) {
/* we haven't gone through the config process */
/* (shouldn't happen) */
DEBOUT(("Map: No device pointer!\n"));
return 0;
}
/*
* Fill in the scsipi_adapter.
*/
adapt->adapt_dev = sc->sc_dev;
adapt->adapt_nchannels = 1;
adapt->adapt_request = iscsi_scsipi_request;
adapt->adapt_minphys = iscsi_minphys;
adapt->adapt_openings = CCBS_PER_SESSION;
adapt->adapt_max_periph = CCBS_PER_SESSION;
/*
* Fill in the scsipi_channel.
*/
if ((tgt = getquirks(chan->chan_name)) == NULL) {
tgt = getquirks("unknown");
}
chan->chan_name = tgt->tgt;
chan->chan_defquirks = tgt->quirks;
chan->chan_adapter = adapt;
chan->chan_bustype = &scsi_bustype;
chan->chan_channel = 0;
chan->chan_flags = SCSIPI_CHAN_NOSETTLE;
chan->chan_ntargets = 1;
chan->chan_nluns = 16; /* ToDo: ??? */
chan->chan_id = session->id;
session->child_dev = config_found(sc->sc_dev, chan, scsiprint);
return session->child_dev != NULL;
}
/*
* unmap_session
* This (indirectly) unmaps the existing all LUNs for a target by
* telling the config system that the adapter has detached.
*
* Parameter: the session pointer
*
* Returns: 1 on success, 0 on failure
*/
int
unmap_session(session_t *session)
{
device_t dev;
int rv = 1;
if ((dev = session->child_dev) != NULL) {
session->child_dev = NULL;
if (config_detach(dev, 0))
rv = 0;
}
return rv;
}
/******************************************************************************/
/*****************************************************************************
* SCSI interface routines
*****************************************************************************/
/*
* iscsi_scsipi_request:
* Perform a request for the SCSIPI layer.
*/
void
iscsi_scsipi_request(struct scsipi_channel *chan, scsipi_adapter_req_t req,
void *arg)
{
struct scsipi_adapter *adapt = chan->chan_adapter;
struct scsipi_xfer *xs;
session_t *session;
int flags;
struct scsipi_xfer_mode *xm;
session = (session_t *) adapt; /* adapter is first field in session */
switch (req) {
case ADAPTER_REQ_RUN_XFER:
DEB(9, ("ISCSI: scsipi_request RUN_XFER\n"));
xs = arg;
flags = xs->xs_control;
if ((flags & XS_CTL_POLL) != 0) {
xs->error = XS_DRIVER_STUFFUP;
DEBOUT(("Run Xfer request with polling\n"));
scsipi_done(xs);
return;
}
/*
* NOTE: It appears that XS_CTL_DATA_UIO is not actually used anywhere.
* Since it really would complicate matters to handle offsets
* into scatter-gather lists, and a number of other drivers don't
* handle uio-based data as well, XS_CTL_DATA_UIO isn't
* implemented in this driver (at least for now).
*/
if (flags & XS_CTL_DATA_UIO) {
xs->error = XS_DRIVER_STUFFUP;
DEBOUT(("Run Xfer with data in UIO\n"));
scsipi_done(xs);
return;
}
send_run_xfer(session, xs);
DEB(9, ("scsipi_req returns\n"));
return;
case ADAPTER_REQ_GROW_RESOURCES:
DEBOUT(("ISCSI: scsipi_request GROW_RESOURCES\n"));
return;
case ADAPTER_REQ_SET_XFER_MODE:
DEB(5, ("ISCSI: scsipi_request SET_XFER_MODE\n"));
xm = (struct scsipi_xfer_mode *)arg;
xm->xm_mode = PERIPH_CAP_TQING;
scsipi_async_event(chan, ASYNC_EVENT_XFER_MODE, xm);
return;
default:
break;
}
DEBOUT(("ISCSI: scsipi_request with invalid REQ code %d\n", req));
}
/* cap the transfer at 64K */
#define ISCSI_MAX_XFER 65536
/*
* iscsi_minphys:
* Limit a transfer to our maximum transfer size.
*/
void
iscsi_minphys(struct buf *bp)
{
if (bp->b_bcount > ISCSI_MAX_XFER) {
bp->b_bcount = ISCSI_MAX_XFER;
}
}
/*****************************************************************************
* SCSI job execution helper routines
*****************************************************************************/
/*
* iscsi_done:
*
* A CCB has completed execution. Pass the status back to the
* upper layer.
*/
void
iscsi_done(ccb_t *ccb)
{
struct scsipi_xfer *xs = ccb->xs;
/*DEBOUT (("iscsi_done\n")); */
if (xs != NULL) {
xs->resid = ccb->residual;
switch (ccb->status) {
case ISCSI_STATUS_SUCCESS:
xs->error = 0;
break;
case ISCSI_STATUS_CHECK_CONDITION:
xs->error = XS_SENSE;
#ifdef ISCSI_DEBUG
{
uint8_t *s = (uint8_t *) (&xs->sense);
DEB(5, ("Scsipi_done, error=XS_SENSE, sense data=%02x "
"%02x %02x %02x...\n",
s[0], s[1], s[2], s[3]));
}
#endif
break;
case ISCSI_STATUS_TARGET_BUSY:
xs->error = XS_BUSY;
break;
case ISCSI_STATUS_SOCKET_ERROR:
case ISCSI_STATUS_TIMEOUT:
xs->error = XS_SELTIMEOUT;
break;
default:
xs->error = XS_DRIVER_STUFFUP;
break;
}
DEB(99, ("Calling scsipi_done (%p), err = %d\n", xs, xs->error));
scsipi_done(xs);
DEB(99, ("scsipi_done returned\n"));
}
}
/* Kernel Module support */
#include <sys/module.h>
MODULE(MODULE_CLASS_DRIVER, iscsi, NULL);
static const struct cfiattrdata ibescsi_info = { "scsi", 1,
{{"channel", "-1", -1},}
};
static const struct cfiattrdata *const iscsi_attrs[] = { &ibescsi_info, NULL };
#ifdef _MODULE
CFDRIVER_DECL(iscsi, DV_DULL, iscsi_attrs);
static struct cfdata iscsi_cfdata[] = {
{
.cf_name = "iscsi",
.cf_atname = "iscsi",
.cf_unit = 0, /* Only unit 0 is ever used */
.cf_fstate = FSTATE_NOTFOUND,
.cf_loc = NULL,
.cf_flags = 0,
.cf_pspec = NULL,
},
{ NULL, NULL, 0, 0, NULL, 0, NULL }
};
#endif
static int
iscsi_modcmd(modcmd_t cmd, void *arg)
{
#ifdef _MODULE
devmajor_t cmajor = NODEVMAJOR, bmajor = NODEVMAJOR;
int error;
#endif
switch (cmd) {
case MODULE_CMD_INIT:
#ifdef _MODULE
error = config_cfdriver_attach(&iscsi_cd);
if (error) {
return error;
}
error = config_cfattach_attach(iscsi_cd.cd_name, &iscsi_ca);
if (error) {
config_cfdriver_detach(&iscsi_cd);
aprint_error("%s: unable to register cfattach\n",
iscsi_cd.cd_name);
return error;
}
error = config_cfdata_attach(iscsi_cfdata, 1);
if (error) {
aprint_error("%s: unable to attach cfdata\n",
iscsi_cd.cd_name);
config_cfattach_detach(iscsi_cd.cd_name, &iscsi_ca);
config_cfdriver_detach(&iscsi_cd);
return error;
}
error = devsw_attach(iscsi_cd.cd_name, NULL, &bmajor,
&iscsi_cdevsw, &cmajor);
if (error) {
aprint_error("%s: unable to register devsw\n",
iscsi_cd.cd_name);
config_cfdata_detach(iscsi_cfdata);
config_cfattach_detach(iscsi_cd.cd_name, &iscsi_ca);
config_cfdriver_detach(&iscsi_cd);
return error;
}
if (config_attach_pseudo(iscsi_cfdata) == NULL) {
aprint_error("%s: config_attach_pseudo failed\n",
iscsi_cd.cd_name);
config_cfattach_detach(iscsi_cd.cd_name, &iscsi_ca);
config_cfdriver_detach(&iscsi_cd);
return ENXIO;
}
#endif
return 0;
break;
case MODULE_CMD_FINI:
#ifdef _MODULE
error = config_cfdata_detach(iscsi_cfdata);
if (error)
return error;
config_cfattach_detach(iscsi_cd.cd_name, &iscsi_ca);
config_cfdriver_detach(&iscsi_cd);
devsw_detach(NULL, &iscsi_cdevsw);
#endif
return 0;
break;
case MODULE_CMD_AUTOUNLOAD:
return EBUSY;
break;
default:
return ENOTTY;
break;
}
}
|