sys/dev/disk/iscsi/initiator/isc_sm.c

root/sys/dev/disk/iscsi/initiator/isc_sm.c
/*-
 * Copyright (c) 2005-2008 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: src/sys/dev/iscsi/initiator/isc_sm.c,v 1.3 2008/11/25 07:17:11 scottl Exp $
 */
/*
 | iSCSI - Session Manager
 | $Id: isc_sm.c,v 1.30 2007/04/22 09:53:09 danny Exp danny $
 */

#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/queue.h>
#include <sys/kthread.h>
#include <sys/syslog.h>
#include <sys/mbuf.h>
#include <sys/bus.h>
#include <sys/eventhandler.h>

#include <sys/mutex2.h>
#include <sys/mplock2.h>

#include <bus/cam/cam.h>
#include <bus/cam/cam_ccb.h>
#include <bus/cam/cam_sim.h>
#include <bus/cam/cam_xpt_sim.h>
#include <bus/cam/cam_periph.h>

#include <dev/disk/iscsi/initiator/iscsi.h>
#include <dev/disk/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);
     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(sp->hdrDigest)
          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(sp->dataDigest)
               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);

     iscsi_lock_ex(&sp->io_mtx);
     sp->flags |= ISC_OQNOTEMPTY;
     if(sp->flags & ISC_OWAITING)
          wakeup(&sp->flags);
     iscsi_unlock_ex(&sp->io_mtx);

     return error;
}
/*
 | called when a fullPhase is restarted
 */
static 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
     iscsi_lock_ex(&sp->io_mtx);
     if(sp->flags & ISC_OWAITING) {
          wakeup(&sp->flags);
     }
     iscsi_unlock_ex(&sp->io_mtx);

     sdebug(2, "restarted lastcmd=0x%x", lastcmd);
}

int
ism_fullfeature(struct cdev *dev, int flag)
{
     isc_session_t *sp = (isc_session_t *)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
          error = ic_fullfeature(dev);
          break;
     case 2: // restart
          ism_restart(sp);
          break;
     }
     return error;
}

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]);
#if 0
     {
          /*
           | this code is only for debugging.
           */
          sn_t  *sn = &sp->sn;
          if(sp->cws == 0) {
               if((sp->flags & ISC_STALLED) == 0) {
                    sdebug(4, "window closed: max=0x%x exp=0x%x opcode=0x%x cmd=0x%x cws=%d.",
                           sn->maxCmd, sn->expCmd, bhs->opcode, sn->cmd, sp->cws);
                    sp->flags |= ISC_STALLED;
               } else
               if(sp->flags & ISC_STALLED) {
                    sdebug(4, "window opened: max=0x%x exp=0x%x opcode=0x%x cmd=0x%x cws=%d.",
                           sn->maxCmd, sn->expCmd, bhs->opcode, sn->cmd, sp->cws);
                    sp->flags &= ~ISC_STALLED;
               }
          }
     }
#endif

#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, ndone;
     int        which;

     debug_called(8);
     error = ndone = 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);
               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(pq->ccb)
               i_nqueue_hld(sp, pq);

          if((error = isc_sendPDU(sp, pq)) == 0) {
               ndone++;
               if(pq->ccb == NULL)
                    pdu_free(sp->isc, pq);
          }
          else {
               xdebug("error=%d ndone=%d opcode=0x%x ccb=%p itt=%x",
                      error, ndone, bhs->opcode, pq->ccb, ntohl(bhs->itt));
               if(pq->ccb)
                    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->isc, pq->ccb);
                         pdu_free(sp->isc, pq);
               }
                    else
                         xdebug("we lost it!");
               }
          }
     }
     return error;
}

/*
 | survives link breakdowns.
 */
static void
ism_proc(void *vp)
{
     isc_session_t      *sp = (isc_session_t *)vp;
     int                error;

     get_mplock();
     debug_called(8);

     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);
               }
          }
          iscsi_lock_ex(&sp->io_mtx);
          if((sp->flags & ISC_LINK_UP) == 0) {
               wakeup(&sp->soc);
          }

          if((sp->flags & (ISC_OQNOTEMPTY | ISC_SM_RUN)) == ISC_SM_RUN) {
               sp->flags |= ISC_OWAITING;
               if(issleep(&sp->flags, &sp->io_mtx, 0, "iscproc", hz*30) == EWOULDBLOCK) {
                    if(sp->flags & ISC_CON_RUNNING)
                    _nop_out(sp);
               }
               sp->flags &= ~ISC_OWAITING;
          }
          sp->flags &= ~ISC_OQNOTEMPTY;
          iscsi_unlock_ex(&sp->io_mtx);
     } while(sp->flags & ISC_SM_RUN);

     sp->flags &= ~ISC_SM_RUNNING;
     sdebug(3, "dropped ISC_SM_RUNNING");

     wakeup(sp);

     debug(3, "terminated sp=%p sp->sid=%d", sp, sp->sid);

     rel_mplock();
}

#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;
     ksprintf(bp, "targetname='%s'", sp->opt.targetName);
     bp += strlen(bp);
     ksprintf(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);
     ksnprintf(bp, n, "recv=%d sent=%d", sp->stats.nrecv, sp->stats.nsent);
     bp += strlen(bp);
     n -= strlen(bp);
     ksnprintf(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);
     ksnprintf(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;
     ksnprintf(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;
     ksnprintf(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, sp->dev->si_name);

     sysctl_ctx_init(&sp->clist);
     sp->oid = SYSCTL_ADD_NODE(&sp->clist,
                               SYSCTL_CHILDREN(sp->isc->oid),
                               OID_AUTO,
                               sp->dev->si_name+5, // iscsi0
                               CTLFLAG_RD,
                               0,
                               "initiator");
     SYSCTL_ADD_PROC(&sp->clist,
                     SYSCTL_CHILDREN(sp->oid),
                     OID_AUTO,
                     "targetname",
                     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",
                     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",
                     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;
     cdev_t     dev;

     debug_called(8);
     sdebug(2, "terminating");
     /*
      | first stop the receiver
      */
     isc_stop_receiver(sp);

     /*
      | now stop the xmitter
      */
     sp->flags &= ~ISC_SM_RUN;
     while(sp->flags & ISC_SM_RUNNING) {
          sdebug(2, "waiting for ism to stop");
          wakeup(&sp->flags);
          tsleep(sp, 0, "-", hz);
     }
     sdebug(2, "ism stopped");
     sp->flags &= ~ISC_FFPHASE;

     iscsi_cleanup(sp);

     (void)i_pdu_flush(sp);

     ic_lost_target(sp, sp->sid);

     lockmgr(&sc->lock, LK_EXCLUSIVE);
     TAILQ_REMOVE(&sc->isc_sess, sp, sp_link);
     sc->nsess--;
     lockmgr(&sc->lock, LK_RELEASE);

     dev = sp->dev;
     sp->dev = NULL;

     release_dev(dev);
     destroy_dev(dev);

     mtx_uninit(&sp->rsp_mtx);
     mtx_uninit(&sp->rsv_mtx);
     mtx_uninit(&sp->hld_mtx);
     mtx_uninit(&sp->snd_mtx);
     mtx_uninit(&sp->io_mtx);

     i_freeopt(&sp->opt);
     sc->sessions[sp->sid] = NULL;

     if(sysctl_ctx_free(&sp->clist))
          xdebug("sysctl_ctx_free failed");

     kfree(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, "irsv");
     mtx_init(&sp->rsp_mtx, "irsp");
     mtx_init(&sp->snd_mtx, "isnd");
     mtx_init(&sp->hld_mtx, "ihld");

     mtx_init(&sp->io_mtx, "isio");

     isc_add_sysctls(sp);

     sp->flags |= ISC_SM_RUN;
     sp->flags |= ISC_SM_RUNNING;

     debug(4, "starting ism_proc: sp->sid=%d", sp->sid);
     return kthread_create(ism_proc, sp, &sp->stp, "ism_%d", sp->sid);
}
DragonflyBSD
