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/*-
* 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.
*
* $FreeBSD: release/9.1.0/sys/dev/iscsi/initiator/iscsivar.h 212149 2010-09-02 14:13:43Z des $
*/
/*
| $Id: iscsivar.h 743 2009-08-08 10:54:53Z danny $
*/
#define ISCSI_MAX_LUNS 128 // don't touch this
#if ISCSI_MAX_LUNS > 8
/*
| for this to work
| sysctl kern.cam.cam_srch_hi=1
*/
#endif
#ifndef ISCSI_INITIATOR_DEBUG
#define ISCSI_INITIATOR_DEBUG 1
#endif
#ifdef ISCSI_INITIATOR_DEBUG
extern int iscsi_debug;
#define debug(level, fmt, args...) do {if(level <= iscsi_debug)\
printf("%s: " fmt "\n", __func__ , ##args);} while(0)
#define sdebug(level, fmt, args...) do {if(level <= iscsi_debug)\
printf("%d] %s: " fmt "\n", sp->sid, __func__ , ##args);} while(0)
#define debug_called(level) do {if(level <= iscsi_debug)\
printf("%s: called\n", __func__);} while(0)
#else
#define debug(level, fmt, args...)
#define debug_called(level)
#define sdebug(level, fmt, args...)
#endif /* ISCSI_INITIATOR_DEBUG */
#define xdebug(fmt, args...) printf(">>> %s: " fmt "\n", __func__ , ##args)
#define MAX_SESSIONS ISCSI_MAX_TARGETS
#define MAX_PDUS (MAX_SESSIONS*256) // XXX: at the moment this is arbitrary
typedef uint32_t digest_t(const void *, int len, uint32_t ocrc);
MALLOC_DECLARE(M_ISCSI);
MALLOC_DECLARE(M_ISCSIBUF);
MALLOC_DECLARE(M_PDU);
#define ISOK2DIG(dig, pp) ((dig != NULL) && ((pp->ipdu.bhs.opcode & 0x1f) != ISCSI_LOGIN_CMD))
#ifndef BIT
#define BIT(n) (1 <<(n))
#endif
#define ISC_SM_RUN BIT(0)
#define ISC_SM_RUNNING BIT(1)
#define ISC_LINK_UP BIT(2)
#define ISC_CON_RUN BIT(3)
#define ISC_CON_RUNNING BIT(4)
#define ISC_KILL BIT(5)
#define ISC_OQNOTEMPTY BIT(6)
#define ISC_OWAITING BIT(7)
#define ISC_FFPHASE BIT(8)
#define ISC_CAMDEVS BIT(9)
#define ISC_SCANWAIT BIT(10)
#define ISC_MEMWAIT BIT(11)
#define ISC_SIGNALED BIT(12)
#define ISC_HOLD BIT(15)
#define ISC_HOLDED BIT(16)
#define ISC_SHUTDOWN BIT(31)
/*
| some stats
*/
struct i_stats {
int npdu; // number of pdus malloc'ed.
int nrecv; // unprocessed received pdus
int nsent; // sent pdus
int nrsp, max_rsp;
int nrsv, max_rsv;
int ncsnd, max_csnd;
int nisnd, max_isnd;
int nwsnd, max_wsnd;
int nhld, max_hld;
struct bintime t_sent;
struct bintime t_recv;
};
/*
| one per 'session'
*/
typedef TAILQ_HEAD(, pduq) queue_t;
typedef struct isc_session {
TAILQ_ENTRY(isc_session) sp_link;
int flags;
struct cdev *dev;
struct socket *soc;
struct file *fp;
struct thread *td;
struct proc *proc; // the userland process
int signal;
struct proc *soc_proc;
struct proc *stp; // the sm thread
struct isc_softc *isc;
digest_t *hdrDigest; // the digest alg. if any
digest_t *dataDigest; // the digest alg. if any
int sid; // Session ID
sn_t sn; // sequence number stuff;
int cws; // current window size
int target_nluns; // this and target_lun are
// hopefully temporal till I
// figure out a better way.
int target_lun[ISCSI_MAX_LUNS/(sizeof(int)*8) + 1];
struct mtx rsp_mtx;
struct mtx rsv_mtx;
struct mtx snd_mtx;
struct mtx hld_mtx;
struct mtx io_mtx;
queue_t rsp;
queue_t rsv;
queue_t csnd;
queue_t isnd;
queue_t wsnd;
queue_t hld;
isc_opt_t opt; // negotiable values
struct i_stats stats;
bhs_t bhs;
struct uio uio;
struct iovec iov;
/*
| cam stuff
*/
struct cam_sim *cam_sim;
struct cam_path *cam_path;
struct mtx cam_mtx;
/*
| sysctl stuff
*/
struct sysctl_ctx_list clist;
struct sysctl_oid *oid;
int douio; //XXX: turn on/off uio on read
} isc_session_t;
typedef struct pduq {
TAILQ_ENTRY(pduq) pq_link;
caddr_t buf;
u_int len; // the total length of the pdu
pdu_t pdu;
union ccb *ccb;
struct uio uio;
struct iovec iov[5]; // XXX: careful ...
struct mbuf *mp;
struct bintime ts;
queue_t *pduq;
} pduq_t;
/*
*/
struct isc_softc {
struct mtx isc_mtx;
TAILQ_HEAD(,isc_session) isc_sess;
int nsess;
struct cdev *dev;
char isid[6]; // Initiator Session ID (48 bits)
struct unrhdr *unit;
struct sx unit_sx;
uma_zone_t pdu_zone; // pool of free pdu's
#ifdef ISCSI_INITIATOR_DEBUG
int npdu_alloc, npdu_max; // for instrumentation
#endif
#ifdef DO_EVENTHANDLER
eventhandler_tag eh;
#endif
/*
| sysctl stuff
*/
struct sysctl_ctx_list clist;
struct sysctl_oid *oid;
};
#ifdef ISCSI_INITIATOR_DEBUG
extern struct mtx iscsi_dbg_mtx;
#endif
void isc_start_receiver(isc_session_t *sp);
void isc_stop_receiver(isc_session_t *sp);
int isc_sendPDU(isc_session_t *sp, pduq_t *pq);
int isc_qout(isc_session_t *sp, pduq_t *pq);
int i_prepPDU(isc_session_t *sp, pduq_t *pq);
int ism_fullfeature(struct cdev *dev, int flag);
int i_pdu_flush(isc_session_t *sc);
int i_setopt(isc_session_t *sp, isc_opt_t *opt);
void i_freeopt(isc_opt_t *opt);
int ic_init(isc_session_t *sp);
void ic_destroy(isc_session_t *sp);
void ic_lost_target(isc_session_t *sp, int target);
int ic_getCamVals(isc_session_t *sp, iscsi_cam_t *cp);
void ism_recv(isc_session_t *sp, pduq_t *pq);
int ism_start(isc_session_t *sp);
void ism_restart(isc_session_t *sp);
void ism_stop(isc_session_t *sp);
int scsi_encap(struct cam_sim *sim, union ccb *ccb);
int scsi_decap(isc_session_t *sp, pduq_t *opq, pduq_t *pq);
void iscsi_r2t(isc_session_t *sp, pduq_t *opq, pduq_t *pq);
void iscsi_done(isc_session_t *sp, pduq_t *opq, pduq_t *pq);
void iscsi_reject(isc_session_t *sp, pduq_t *opq, pduq_t *pq);
void iscsi_async(isc_session_t *sp, pduq_t *pq);
void iscsi_cleanup(isc_session_t *sp);
int iscsi_requeue(isc_session_t *sp);
// Serial Number Arithmetic
#define _MAXINCR 0x7FFFFFFF // 2 ^ 31 - 1
#define SNA_GT(i1, i2) ((i1 != i2) && (\
(i1 < i2 && i2 - i1 > _MAXINCR) ||\
(i1 > i2 && i1 - i2 < _MAXINCR))?1: 0)
/*
| inlines
*/
#ifdef _CAM_CAM_XPT_SIM_H
#if __FreeBSD_version < 600000
#define CAM_LOCK(arg)
#define CAM_ULOCK(arg)
static __inline void
XPT_DONE(isc_session_t *sp, union ccb *ccb)
{
mtx_lock(&Giant);
xpt_done(ccb);
mtx_unlock(&Giant);
}
#elif __FreeBSD_version >= 700000
#define CAM_LOCK(arg) mtx_lock(&arg->cam_mtx)
#define CAM_UNLOCK(arg) mtx_unlock(&arg->cam_mtx)
static __inline void
XPT_DONE(isc_session_t *sp, union ccb *ccb)
{
CAM_LOCK(sp);
xpt_done(ccb);
CAM_UNLOCK(sp);
}
#else
//__FreeBSD_version >= 600000
#define CAM_LOCK(arg)
#define CAM_UNLOCK(arg)
#define XPT_DONE(ignore, arg) xpt_done(arg)
#endif
#endif /* _CAM_CAM_XPT_SIM_H */
static __inline pduq_t *
pdu_alloc(struct isc_softc *isc, int wait)
{
pduq_t *pq;
pq = (pduq_t *)uma_zalloc(isc->pdu_zone, wait /* M_WAITOK or M_NOWAIT*/);
if(pq == NULL) {
debug(7, "out of mem");
return NULL;
}
#ifdef ISCSI_INITIATOR_DEBUG
isc->npdu_alloc++;
if(isc->npdu_alloc > isc->npdu_max)
isc->npdu_max = isc->npdu_alloc;
#endif
memset(pq, 0, sizeof(pduq_t));
return pq;
}
static __inline void
pdu_free(struct isc_softc *isc, pduq_t *pq)
{
if(pq->mp)
m_freem(pq->mp);
#ifdef NO_USE_MBUF
if(pq->buf != NULL)
free(pq->buf, M_ISCSIBUF);
#endif
#ifdef ISCSI_INITIATOR_DEBUG
isc->npdu_alloc--;
#endif
uma_zfree(isc->pdu_zone, pq);
}
static __inline void
i_nqueue_rsp(isc_session_t *sp, pduq_t *pq)
{
mtx_lock(&sp->rsp_mtx);
if(++sp->stats.nrsp > sp->stats.max_rsp)
sp->stats.max_rsp = sp->stats.nrsp;
TAILQ_INSERT_TAIL(&sp->rsp, pq, pq_link);
mtx_unlock(&sp->rsp_mtx);
}
static __inline pduq_t *
i_dqueue_rsp(isc_session_t *sp)
{
pduq_t *pq;
mtx_lock(&sp->rsp_mtx);
if((pq = TAILQ_FIRST(&sp->rsp)) != NULL) {
sp->stats.nrsp--;
TAILQ_REMOVE(&sp->rsp, pq, pq_link);
}
mtx_unlock(&sp->rsp_mtx);
return pq;
}
static __inline void
i_nqueue_rsv(isc_session_t *sp, pduq_t *pq)
{
mtx_lock(&sp->rsv_mtx);
if(++sp->stats.nrsv > sp->stats.max_rsv)
sp->stats.max_rsv = sp->stats.nrsv;
TAILQ_INSERT_TAIL(&sp->rsv, pq, pq_link);
mtx_unlock(&sp->rsv_mtx);
}
static __inline pduq_t *
i_dqueue_rsv(isc_session_t *sp)
{
pduq_t *pq;
mtx_lock(&sp->rsv_mtx);
if((pq = TAILQ_FIRST(&sp->rsv)) != NULL) {
sp->stats.nrsv--;
TAILQ_REMOVE(&sp->rsv, pq, pq_link);
}
mtx_unlock(&sp->rsv_mtx);
return pq;
}
static __inline void
i_nqueue_csnd(isc_session_t *sp, pduq_t *pq)
{
mtx_lock(&sp->snd_mtx);
if(++sp->stats.ncsnd > sp->stats.max_csnd)
sp->stats.max_csnd = sp->stats.ncsnd;
TAILQ_INSERT_TAIL(&sp->csnd, pq, pq_link);
mtx_unlock(&sp->snd_mtx);
}
static __inline pduq_t *
i_dqueue_csnd(isc_session_t *sp)
{
pduq_t *pq;
mtx_lock(&sp->snd_mtx);
if((pq = TAILQ_FIRST(&sp->csnd)) != NULL) {
sp->stats.ncsnd--;
TAILQ_REMOVE(&sp->csnd, pq, pq_link);
}
mtx_unlock(&sp->snd_mtx);
return pq;
}
static __inline void
i_nqueue_isnd(isc_session_t *sp, pduq_t *pq)
{
mtx_lock(&sp->snd_mtx);
if(++sp->stats.nisnd > sp->stats.max_isnd)
sp->stats.max_isnd = sp->stats.nisnd;
TAILQ_INSERT_TAIL(&sp->isnd, pq, pq_link);
mtx_unlock(&sp->snd_mtx);
}
static __inline pduq_t *
i_dqueue_isnd(isc_session_t *sp)
{
pduq_t *pq;
mtx_lock(&sp->snd_mtx);
if((pq = TAILQ_FIRST(&sp->isnd)) != NULL) {
sp->stats.nisnd--;
TAILQ_REMOVE(&sp->isnd, pq, pq_link);
}
mtx_unlock(&sp->snd_mtx);
return pq;
}
static __inline void
i_nqueue_wsnd(isc_session_t *sp, pduq_t *pq)
{
mtx_lock(&sp->snd_mtx);
if(++sp->stats.nwsnd > sp->stats.max_wsnd)
sp->stats.max_wsnd = sp->stats.nwsnd;
TAILQ_INSERT_TAIL(&sp->wsnd, pq, pq_link);
mtx_unlock(&sp->snd_mtx);
}
static __inline pduq_t *
i_dqueue_wsnd(isc_session_t *sp)
{
pduq_t *pq;
mtx_lock(&sp->snd_mtx);
if((pq = TAILQ_FIRST(&sp->wsnd)) != NULL) {
sp->stats.nwsnd--;
TAILQ_REMOVE(&sp->wsnd, pq, pq_link);
}
mtx_unlock(&sp->snd_mtx);
return pq;
}
static __inline pduq_t *
i_dqueue_snd(isc_session_t *sp, int which)
{
pduq_t *pq;
pq = NULL;
mtx_lock(&sp->snd_mtx);
if((which & BIT(0)) && (pq = TAILQ_FIRST(&sp->isnd)) != NULL) {
sp->stats.nisnd--;
TAILQ_REMOVE(&sp->isnd, pq, pq_link);
pq->pduq = &sp->isnd; // remember where you came from
} else
if((which & BIT(1)) && (pq = TAILQ_FIRST(&sp->wsnd)) != NULL) {
sp->stats.nwsnd--;
TAILQ_REMOVE(&sp->wsnd, pq, pq_link);
pq->pduq = &sp->wsnd; // remember where you came from
} else
if((which & BIT(2)) && (pq = TAILQ_FIRST(&sp->csnd)) != NULL) {
sp->stats.ncsnd--;
TAILQ_REMOVE(&sp->csnd, pq, pq_link);
pq->pduq = &sp->csnd; // remember where you came from
}
mtx_unlock(&sp->snd_mtx);
return pq;
}
static __inline void
i_rqueue_pdu(isc_session_t *sp, pduq_t *pq)
{
mtx_lock(&sp->snd_mtx);
KASSERT(pq->pduq != NULL, ("pq->pduq is NULL"));
TAILQ_INSERT_TAIL(pq->pduq, pq, pq_link);
mtx_unlock(&sp->snd_mtx);
}
/*
| Waiting for ACK (or something :-)
*/
static __inline void
i_nqueue_hld(isc_session_t *sp, pduq_t *pq)
{
getbintime(&pq->ts);
mtx_lock(&sp->hld_mtx);
if(++sp->stats.nhld > sp->stats.max_hld)
sp->stats.max_hld = sp->stats.nhld;
TAILQ_INSERT_TAIL(&sp->hld, pq, pq_link);
mtx_unlock(&sp->hld_mtx);
return;
}
static __inline void
i_remove_hld(isc_session_t *sp, pduq_t *pq)
{
mtx_lock(&sp->hld_mtx);
sp->stats.nhld--;
TAILQ_REMOVE(&sp->hld, pq, pq_link);
mtx_unlock(&sp->hld_mtx);
}
static __inline pduq_t *
i_dqueue_hld(isc_session_t *sp)
{
pduq_t *pq;
mtx_lock(&sp->hld_mtx);
if((pq = TAILQ_FIRST(&sp->hld)) != NULL) {
sp->stats.nhld--;
TAILQ_REMOVE(&sp->hld, pq, pq_link);
}
mtx_unlock(&sp->hld_mtx);
return pq;
}
static __inline pduq_t *
i_search_hld(isc_session_t *sp, int itt, int keep)
{
pduq_t *pq, *tmp;
pq = NULL;
mtx_lock(&sp->hld_mtx);
TAILQ_FOREACH_SAFE(pq, &sp->hld, pq_link, tmp) {
if(pq->pdu.ipdu.bhs.itt == itt) {
if(!keep) {
sp->stats.nhld--;
TAILQ_REMOVE(&sp->hld, pq, pq_link);
}
break;
}
}
mtx_unlock(&sp->hld_mtx);
return pq;
}
static __inline void
i_acked_hld(isc_session_t *sp, pdu_t *op)
{
pduq_t *pq, *tmp;
u_int exp = sp->sn.expCmd;
pq = NULL;
mtx_lock(&sp->hld_mtx);
TAILQ_FOREACH_SAFE(pq, &sp->hld, pq_link, tmp) {
if((op && op->ipdu.bhs.itt == pq->pdu.ipdu.bhs.itt)
|| (pq->ccb == NULL
&& (pq->pdu.ipdu.bhs.opcode != ISCSI_WRITE_DATA)
&& SNA_GT(exp, ntohl(pq->pdu.ipdu.bhs.ExpStSN)))) {
sp->stats.nhld--;
TAILQ_REMOVE(&sp->hld, pq, pq_link);
pdu_free(sp->isc, pq);
}
}
mtx_unlock(&sp->hld_mtx);
}
static __inline void
i_mbufcopy(struct mbuf *mp, caddr_t dp, int len)
{
struct mbuf *m;
caddr_t bp;
for(m = mp; m != NULL; m = m->m_next) {
bp = mtod(m, caddr_t);
/*
| the pdu is word (4 octed) aligned
| so len <= packet
*/
memcpy(dp, bp, MIN(len, m->m_len));
dp += m->m_len;
len -= m->m_len;
if(len <= 0)
break;
}
}