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freebsd-skq/sys/dev/iscsi_initiator/iscsi_subr.c

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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.
*
*/
/*
| $Id: iscsi_subr.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/callout.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/kthread.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/uio.h>
#include <sys/sysctl.h>
#include <sys/sx.h>
#include <vm/uma.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 <cam/scsi/scsi_message.h>
#include <sys/eventhandler.h>
#include <dev/iscsi_initiator/iscsi.h>
#include <dev/iscsi_initiator/iscsivar.h>
/*
| Interface to the SCSI layer
*/
void
iscsi_r2t(isc_session_t *sp, pduq_t *opq, pduq_t *pq)
{
union ccb *ccb = opq->ccb;
struct ccb_scsiio *csio = &ccb->csio;
pdu_t *opp = &opq->pdu;
bhs_t *bhp = &opp->ipdu.bhs;
r2t_t *r2t = &pq->pdu.ipdu.r2t;
pduq_t *wpq;
int error;
debug_called(8);
sdebug(4, "itt=%x r2tSN=%d bo=%x ddtl=%x W=%d", ntohl(r2t->itt),
ntohl(r2t->r2tSN), ntohl(r2t->bo), ntohl(r2t->ddtl), opp->ipdu.scsi_req.W);
switch(bhp->opcode) {
case ISCSI_SCSI_CMD:
if(opp->ipdu.scsi_req.W) {
data_out_t *cmd;
u_int ddtl = ntohl(r2t->ddtl);
u_int edtl = ntohl(opp->ipdu.scsi_req.edtlen);
u_int bleft, bs, dsn, bo;
caddr_t bp = csio->data_ptr;
bo = ntohl(r2t->bo);
bp += MIN(bo, edtl - ddtl);
bleft = ddtl;
if(sp->opt.maxXmitDataSegmentLength > 0) // danny's RFC
bs = MIN(sp->opt.maxXmitDataSegmentLength, ddtl);
else
bs = ddtl;
dsn = 0;
sdebug(4, "edtl=%x ddtl=%x bo=%x dsn=%x bs=%x maxX=%x",
edtl, ddtl, bo, dsn, bs, sp->opt.maxXmitDataSegmentLength);
while(bleft > 0) {
wpq = pdu_alloc(sp->isc, M_NOWAIT); // testing ...
if(wpq == NULL) {
sdebug(3, "itt=%x r2tSN=%d bo=%x ddtl=%x W=%d", ntohl(r2t->itt),
ntohl(r2t->r2tSN), ntohl(r2t->bo), ntohl(r2t->ddtl), opp->ipdu.scsi_req.W);
sdebug(1, "npdu_max=%d npdu_alloc=%d", sp->isc->npdu_max, sp->isc->npdu_alloc);
while((wpq = pdu_alloc(sp->isc, M_NOWAIT)) == NULL) {
sdebug(2, "waiting...");
#if __FreeBSD_version >= 700000
pause("isc_r2t", 5*hz);
#else
tsleep(sp->isc, 0, "isc_r2t", 5*hz);
#endif
}
}
cmd = &wpq->pdu.ipdu.data_out;
cmd->opcode = ISCSI_WRITE_DATA;
cmd->lun[0] = r2t->lun[0];
cmd->lun[1] = r2t->lun[1];
cmd->ttt = r2t->ttt;
cmd->itt = r2t->itt;
cmd->dsn = htonl(dsn);
cmd->bo = htonl(bo);
cmd->F = (bs < bleft)? 0: 1; // is this the last one?
bs = MIN(bs, bleft);
wpq->pdu.ds_len = bs;
wpq->pdu.ds_addr = bp;
error = isc_qout(sp, wpq);
sdebug(6, "bs=%x bo=%x bp=%p dsn=%x error=%d", bs, bo, bp, dsn, error);
if(error)
break;
bo += bs;
bp += bs;
bleft -= bs;
dsn++;
}
}
break;
default:
// XXX: should not happen ...
xdebug("huh? opcode=0x%x", bhp->opcode);
}
}
static int
getSenseData(u_int status, union ccb *ccb, pduq_t *pq)
{
pdu_t *pp = &pq->pdu;
struct ccb_scsiio *scsi = (struct ccb_scsiio *)ccb;
struct scsi_sense_data *sense = &scsi->sense_data;
struct mbuf *m = pq->mp;
scsi_rsp_t *cmd = &pp->ipdu.scsi_rsp;
caddr_t bp;
int sense_len, mustfree = 0;
int error_code, sense_key, asc, ascq;
bp = mtod(pq->mp, caddr_t);
if((sense_len = scsi_2btoul(bp)) == 0)
return 0;
debug(4, "sense_len=%d", sense_len);
/*
| according to the specs, the sense data cannot
| be larger than 252 ...
*/
if(sense_len > m->m_len) {
bp = malloc(sense_len, M_ISCSI, M_WAITOK);
debug(3, "calling i_mbufcopy(len=%d)", sense_len);
i_mbufcopy(pq->mp, bp, sense_len);
mustfree++;
}
scsi->scsi_status = status;
bcopy(bp+2, sense, min(sense_len, scsi->sense_len));
scsi->sense_resid = 0;
if(cmd->flag & (BIT(1)|BIT(2)))
scsi->sense_resid = ntohl(pp->ipdu.scsi_rsp.rcnt);
scsi_extract_sense_len(sense, scsi->sense_len - scsi->sense_resid,
&error_code, &sense_key, &asc, &ascq, /*show_errors*/ 1);
debug(3, "sense_len=%d rcnt=%d sense_resid=%d dsl=%d error_code=%x flags=%x",
sense_len,
ntohl(pp->ipdu.scsi_rsp.rcnt), scsi->sense_resid,
pp->ds_len, error_code, sense_key);
if(mustfree)
free(bp, M_ISCSI);
return 1;
}
/*
| Some information is from SAM draft.
*/
static void
_scsi_done(isc_session_t *sp, u_int response, u_int status, union ccb *ccb, pduq_t *pq)
{
struct ccb_hdr *ccb_h = &ccb->ccb_h;
debug_called(8);
if(status || response) {
sdebug(3, "response=%x status=%x ccb=%p pq=%p", response, status, ccb, pq);
if(pq != NULL)
sdebug(3, "mp=%p buf=%p len=%d", pq->mp, pq->buf, pq->len);
}
ccb_h->status = 0;
switch(response) {
case 0: // Command Completed at Target
switch(status) {
case 0: // Good, all is ok
ccb_h->status = CAM_REQ_CMP;
break;
case 0x02: // Check Condition
if((pq != NULL) && (pq->mp != NULL) && getSenseData(status, ccb, pq))
ccb_h->status |= CAM_AUTOSNS_VALID;
case 0x14: // Intermediate-Condition Met
case 0x10: // Intermediate
case 0x04: // Condition Met
ccb_h->status |= CAM_SCSI_STATUS_ERROR;
break;
case 0x08:
ccb_h->status = CAM_BUSY;
break;
case 0x18: // Reservation Conflict
case 0x28: // Task Set Full
ccb_h->status = CAM_REQUEUE_REQ;
break;
default:
//case 0x22: // Command Terminated
//case 0x30: // ACA Active
//case 0x40: // Task Aborted
ccb_h->status = CAM_REQ_CMP_ERR; //CAM_REQ_ABORTED;
}
break;
default:
if((response >= 0x80) && (response <= 0xFF)) {
// Vendor specific ...
}
case 1: // target failure
ccb_h->status = CAM_REQ_CMP_ERR; //CAM_REQ_ABORTED;
break;
}
sdebug(5, "ccb_h->status=%x", ccb_h->status);
XPT_DONE(sp, ccb);
}
/*
| returns the lowest cmdseq that was not acked
*/
int
iscsi_requeue(isc_session_t *sp)
{
pduq_t *pq;
u_int i, n, last;
debug_called(8);
i = last = 0;
sp->flags |= ISC_HOLD;
while((pq = i_dqueue_hld(sp)) != NULL) {
i++;
if(pq->ccb != NULL) {
_scsi_done(sp, 0, 0x28, pq->ccb, NULL);
n = ntohl(pq->pdu.ipdu.bhs.CmdSN);
if(last==0 || (last > n))
last = n;
sdebug(2, "last=%x n=%x", last, n);
}
pdu_free(sp->isc, pq);
}
sp->flags &= ~ISC_HOLD;
return i? last: sp->sn.cmd;
}
int
i_pdu_flush(isc_session_t *sp)
{
int n = 0;
pduq_t *pq;
debug_called(8);
while((pq = i_dqueue_rsp(sp)) != NULL) {
pdu_free(sp->isc, pq);
n++;
}
while((pq = i_dqueue_rsv(sp)) != NULL) {
pdu_free(sp->isc, pq);
n++;
}
while((pq = i_dqueue_snd(sp, -1)) != NULL) {
pdu_free(sp->isc, pq);
n++;
}
while((pq = i_dqueue_hld(sp)) != NULL) {
pdu_free(sp->isc, pq);
n++;
}
while((pq = i_dqueue_wsnd(sp)) != NULL) {
pdu_free(sp->isc, pq);
n++;
}
if(n != 0)
xdebug("%d pdus recovered, should have been ZERO!", n);
return n;
}
/*
| called from ism_destroy.
*/
void
iscsi_cleanup(isc_session_t *sp)
{
pduq_t *pq, *pqtmp;
debug_called(8);
TAILQ_FOREACH_SAFE(pq, &sp->hld, pq_link, pqtmp) {
sdebug(3, "hld pq=%p", pq);
if(pq->ccb)
_scsi_done(sp, 1, 0x40, pq->ccb, NULL);
TAILQ_REMOVE(&sp->hld, pq, pq_link);
if(pq->buf) {
free(pq->buf, M_ISCSIBUF);
pq->buf = NULL;
}
pdu_free(sp->isc, pq);
}
while((pq = i_dqueue_snd(sp, BIT(0)|BIT(1)|BIT(2))) != NULL) {
sdebug(3, "pq=%p", pq);
if(pq->ccb)
_scsi_done(sp, 1, 0x40, pq->ccb, NULL);
if(pq->buf) {
free(pq->buf, M_ISCSIBUF);
pq->buf = NULL;
}
pdu_free(sp->isc, pq);
}
wakeup(&sp->rsp);
}
void
iscsi_done(isc_session_t *sp, pduq_t *opq, pduq_t *pq)
{
pdu_t *pp = &pq->pdu;
scsi_rsp_t *cmd = &pp->ipdu.scsi_rsp;
debug_called(8);
_scsi_done(sp, cmd->response, cmd->status, opq->ccb, pq);
pdu_free(sp->isc, opq);
}
// see RFC 3720, 10.9.1 page 146
/*
| NOTE:
| the call to isc_stop_receiver is a kludge,
| instead, it should be handled by the userland controller,
| but that means that there should be a better way, other than
| sending a signal. Somehow, this packet should be supplied to
| the userland via read.
*/
void
iscsi_async(isc_session_t *sp, pduq_t *pq)
{
pdu_t *pp = &pq->pdu;
async_t *cmd = &pp->ipdu.async;
debug_called(8);
sdebug(3, "asyncevent=0x%x asyncVCode=0x%0x", cmd->asyncEvent, cmd->asyncVCode);
switch(cmd->asyncEvent) {
case 0: // check status ...
break;
case 1: // target request logout
isc_stop_receiver(sp); // XXX: temporary solution
break;
case 2: // target indicates it wants to drop connection
isc_stop_receiver(sp); // XXX: temporary solution
break;
case 3: // target indicates it will drop all connections.
isc_stop_receiver(sp); // XXX: temporary solution
break;
case 4: // target request parameter negotiation
break;
default:
break;
}
}
void
iscsi_reject(isc_session_t *sp, pduq_t *opq, pduq_t *pq)
{
union ccb *ccb = opq->ccb;
//reject_t *reject = &pq->pdu.ipdu.reject;
debug_called(8);
//XXX: check RFC 10.17.1 (page 176)
ccb->ccb_h.status = CAM_REQ_ABORTED;
XPT_DONE(sp, ccb);
pdu_free(sp->isc, opq);
}
/*
| deal with lun
*/
static int
dwl(isc_session_t *sp, int lun, u_char *lp)
{
debug_called(8);
sdebug(4, "lun=%d", lun);
/*
| mapping LUN to iSCSI LUN
| check the SAM-2 specs
| hint: maxLUNS is a small number, cam's LUN is 32bits
| iSCSI is 64bits, scsi is ?
*/
// XXX: check if this will pass the endian test
if(lun < 256) {
lp[0] = 0;
lp[1] = lun;
} else
if(lun < 16384) {
lp[0] = (1 << 5) | ((lun >> 8) & 0x3f);
lp[1] = lun & 0xff;
}
else {
xdebug("lun %d: is unsupported!", lun);
return -1;
}
return 0;
}
/*
| encapsulate the scsi command and
*/
int
scsi_encap(struct cam_sim *sim, union ccb *ccb)
{
isc_session_t *sp = cam_sim_softc(sim);
struct ccb_scsiio *csio = &ccb->csio;
struct ccb_hdr *ccb_h = &ccb->ccb_h;
pduq_t *pq;
scsi_req_t *cmd;
debug_called(8);
debug(4, "ccb->sp=%p", ccb_h->spriv_ptr0);
sp = ccb_h->spriv_ptr0;
if((pq = pdu_alloc(sp->isc, M_NOWAIT)) == NULL) {
debug(2, "ccb->sp=%p", ccb_h->spriv_ptr0);
sdebug(1, "pdu_alloc failed sc->npdu_max=%d npdu_alloc=%d",
sp->isc->npdu_max, sp->isc->npdu_alloc);
while((pq = pdu_alloc(sp->isc, M_NOWAIT)) == NULL) {
sdebug(2, "waiting...");
#if __FreeBSD_version >= 700000
pause("isc_encap", 5*hz);
#else
tsleep(sp->isc, 0, "isc_encap", 5*hz);
#endif
}
}
cmd = &pq->pdu.ipdu.scsi_req;
cmd->opcode = ISCSI_SCSI_CMD;
cmd->F = 1;
#if 0
// this breaks at least Isilon's iscsi target.
/*
| map tag option, default is UNTAGGED
*/
switch(csio->tag_action) {
case MSG_SIMPLE_Q_TAG: cmd->attr = iSCSI_TASK_SIMPLE; break;
case MSG_HEAD_OF_Q_TAG: cmd->attr = iSCSI_TASK_HOFQ; break;
case MSG_ORDERED_Q_TAG: cmd->attr = iSCSI_TASK_ORDER; break;
case MSG_ACA_TASK: cmd->attr = iSCSI_TASK_ACA; break;
}
#else
cmd->attr = iSCSI_TASK_SIMPLE;
#endif
dwl(sp, ccb_h->target_lun, (u_char *)&cmd->lun);
if((ccb_h->flags & CAM_CDB_POINTER) != 0) {
if((ccb_h->flags & CAM_CDB_PHYS) == 0) {
if(csio->cdb_len > 16) {
sdebug(3, "oversize cdb %d > 16", csio->cdb_len);
goto invalid;
}
}
else {
sdebug(3, "not phys");
goto invalid;
}
}
if(csio->cdb_len > sizeof(cmd->cdb))
xdebug("guevalt! %d > %ld", csio->cdb_len, (long)sizeof(cmd->cdb));
memcpy(cmd->cdb,
ccb_h->flags & CAM_CDB_POINTER? csio->cdb_io.cdb_ptr: csio->cdb_io.cdb_bytes,
csio->cdb_len);
cmd->W = (ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_OUT;
cmd->R = (ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN;
cmd->edtlen = htonl(csio->dxfer_len);
pq->ccb = ccb;
/*
| place it in the out queue
*/
if(isc_qout(sp, pq) == 0)
return 1;
invalid:
ccb->ccb_h.status = CAM_REQ_INVALID;
pdu_free(sp->isc, pq);
return 0;
}
int
scsi_decap(isc_session_t *sp, pduq_t *opq, pduq_t *pq)
{
union ccb *ccb = opq->ccb;
struct ccb_scsiio *csio = &ccb->csio;
pdu_t *opp = &opq->pdu;
bhs_t *bhp = &opp->ipdu.bhs;
debug_called(8);
sdebug(6, "pq=%p opq=%p bhp->opcode=0x%x len=%d",
pq, opq, bhp->opcode, pq->pdu.ds_len);
if(ccb == NULL) {
sdebug(1, "itt=0x%x pq=%p opq=%p bhp->opcode=0x%x len=%d",
ntohl(pq->pdu.ipdu.bhs.itt),
pq, opq, bhp->opcode, pq->pdu.ds_len);
xdebug("%d] ccb == NULL!", sp->sid);
return 0;
}
if(pq->pdu.ds_len != 0) {
switch(bhp->opcode) {
case ISCSI_SCSI_CMD: {
scsi_req_t *cmd = &opp->ipdu.scsi_req;
sdebug(5, "itt=0x%x opcode=%x R=%d",
ntohl(pq->pdu.ipdu.bhs.itt),
pq->pdu.ipdu.bhs.opcode, cmd->R);
switch(pq->pdu.ipdu.bhs.opcode) {
case ISCSI_READ_DATA: // SCSI Data in
{
caddr_t bp = NULL; // = mtod(pq->mp, caddr_t);
data_in_t *rcmd = &pq->pdu.ipdu.data_in;
if(cmd->R) {
sdebug(5, "copy to=%p from=%p l1=%d l2=%d mp@%p",
csio->data_ptr, bp? mtod(pq->mp, caddr_t): 0,
ntohl(cmd->edtlen), pq->pdu.ds_len, pq->mp);
if(ntohl(cmd->edtlen) >= pq->pdu.ds_len) {
int offset, len = pq->pdu.ds_len;
if(pq->mp != NULL) {
caddr_t dp;
offset = ntohl(rcmd->bo);
dp = csio->data_ptr + offset;
i_mbufcopy(pq->mp, dp, len);
}
}
else {
xdebug("edtlen=%d < ds_len=%d",
ntohl(cmd->edtlen), pq->pdu.ds_len);
}
}
if(rcmd->S) {
/*
| contains also the SCSI Status
*/
_scsi_done(sp, 0, rcmd->status, opq->ccb, NULL);
return 0;
} else
return 1;
}
break;
}
}
default:
sdebug(3, "opcode=%02x", bhp->opcode);
break;
}
}
/*
| XXX: error ...
*/
return 1;
}
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