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freebsd-skq/sys/dev/iscsi/initiator/isc_soc.c
Scott Long 3f3137fee5 Big update to the iSCSI initiator code. Highlights include IPv6 support, 
many bugs fixes, many more performance improvements.

Submitted by:	Danny Braniss

M    sbin/iscontrol/iscsi.conf.5
M    sbin/iscontrol/iscontrol.8
M    sbin/iscontrol/iscontrol.h
M    sbin/iscontrol/config.c
M    sbin/iscontrol/fsm.c
M    sbin/iscontrol/login.c
M    sbin/iscontrol/pdu.c
M    sbin/iscontrol/misc.c
M    sbin/iscontrol/auth_subr.c
M    sbin/iscontrol/iscontrol.c
M    sys/dev/iscsi/initiator/isc_cam.c
M    sys/dev/iscsi/initiator/iscsi.h
M    sys/dev/iscsi/initiator/isc_soc.c
M    sys/dev/iscsi/initiator/iscsi_subr.c
M    sys/dev/iscsi/initiator/iscsivar.h
M    sys/dev/iscsi/initiator/isc_subr.c
M    sys/dev/iscsi/initiator/iscsi.c
M    sys/dev/iscsi/initiator/isc_sm.c
2008-11-25 07:17:11 +00:00

643 lines
17 KiB
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/*-
* 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.
*
*/
/*
| iSCSI
| $Id: isc_soc.c,v 1.26 2007/05/19 06:09:01 danny Exp danny $
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#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/ioccom.h>
#include <sys/queue.h>
#include <sys/kthread.h>
#include <sys/syslog.h>
#include <sys/mbuf.h>
#include <sys/user.h>
#include <cam/cam.h>
#include <cam/cam_ccb.h>
#include <dev/iscsi/initiator/iscsi.h>
#include <dev/iscsi/initiator/iscsivar.h>
#ifndef NO_USE_MBUF
#define USE_MBUF
#endif
#ifdef USE_MBUF
static int ou_refcnt = 0;
/*
| function for freeing external storage for mbuf
*/
static void
ext_free(void *a, void *b)
{
pduq_t *pq = b;
if(pq->buf != NULL) {
debug(3, "ou_refcnt=%d a=%p b=%p", ou_refcnt, a, pq->buf);
free(pq->buf, M_ISCSI);
pq->buf = NULL;
}
}
int
isc_sendPDU(isc_session_t *sp, pduq_t *pq)
{
struct mbuf *mh, **mp;
pdu_t *pp = &pq->pdu;
int len, error;
debug_called(8);
/*
| mbuf for the iSCSI header
*/
MGETHDR(mh, M_TRYWAIT, MT_DATA);
mh->m_len = mh->m_pkthdr.len = sizeof(union ipdu_u);
mh->m_pkthdr.rcvif = NULL;
MH_ALIGN(mh, sizeof(union ipdu_u));
bcopy(&pp->ipdu, mh->m_data, sizeof(union ipdu_u));
mh->m_next = NULL;
if(sp->hdrDigest)
pq->pdu.hdr_dig = sp->hdrDigest(&pp->ipdu, sizeof(union ipdu_u), 0);
if(pp->ahs_len) {
/*
| Add any AHS to the iSCSI hdr mbuf
| XXX Assert: (mh->m_pkthdr.len + pp->ahs_len) < MHLEN
*/
bcopy(pp->ahs, (mh->m_data + mh->m_len), pp->ahs_len);
mh->m_len += pp->ahs_len;
mh->m_pkthdr.len += pp->ahs_len;
if(sp->hdrDigest)
pq->pdu.hdr_dig = sp->hdrDigest(&pp->ahs, pp->ahs_len, pq->pdu.hdr_dig);
}
if(sp->hdrDigest) {
debug(2, "hdr_dig=%x", pq->pdu.hdr_dig);
/*
| Add header digest to the iSCSI hdr mbuf
| XXX Assert: (mh->m_pkthdr.len + 4) < MHLEN
*/
bcopy(&pp->hdr_dig, (mh->m_data + mh->m_len), sizeof(int));
mh->m_len += sizeof(int);
mh->m_pkthdr.len += sizeof(int);
}
mp = &mh->m_next;
if(pq->pdu.ds) {
struct mbuf *md;
int off = 0;
len = pp->ds_len;
while(len & 03) // the specs say it must be int alligned
len++;
while(len > 0) {
int l;
MGET(md, M_TRYWAIT, MT_DATA);
md->m_ext.ref_cnt = &ou_refcnt;
l = min(MCLBYTES, len);
debug(5, "setting ext_free(arg=%p len/l=%d/%d)", pq->buf, len, l);
MEXTADD(md, pp->ds + off, l, ext_free, pp->ds + off, pq, 0, EXT_EXTREF);
md->m_len = l;
md->m_next = NULL;
mh->m_pkthdr.len += l;
*mp = md;
mp = &md->m_next;
len -= l;
off += l;
}
}
if(sp->dataDigest) {
struct mbuf *me;
pp->ds_dig = sp->dataDigest(pp->ds, pp->ds_len, 0);
MGET(me, M_TRYWAIT, MT_DATA);
me->m_len = sizeof(int);
MH_ALIGN(mh, sizeof(int));
bcopy(&pp->ds_dig, me->m_data, sizeof(int));
me->m_next = NULL;
mh->m_pkthdr.len += sizeof(int);
*mp = me;
}
if((error = sosend(sp->soc, NULL, NULL, mh, 0, 0, sp->td)) != 0) {
sdebug(3, "error=%d", error);
return error;
}
sp->stats.nsent++;
getbintime(&sp->stats.t_sent);
return 0;
}
#else /* NO_USE_MBUF */
int
isc_sendPDU(isc_session_t *sp, pduq_t *pq)
{
struct uio *uio = &pq->uio;
struct iovec *iv;
pdu_t *pp = &pq->pdu;
int len, error;
debug_called(8);
bzero(uio, sizeof(struct uio));
uio->uio_rw = UIO_WRITE;
uio->uio_segflg = UIO_SYSSPACE;
uio->uio_td = sp->td;
uio->uio_iov = iv = pq->iov;
iv->iov_base = &pp->ipdu;
iv->iov_len = sizeof(union ipdu_u);
uio->uio_resid = pq->len;
iv++;
if(sp->hdrDigest)
pq->pdu.hdr_dig = sp->hdrDigest(&pp->ipdu, sizeof(union ipdu_u), 0);
if(pp->ahs_len) {
iv->iov_base = pp->ahs;
iv->iov_len = pp->ahs_len;
iv++;
if(sp->hdrDigest)
pq->pdu.hdr_dig = sp->hdrDigest(&pp->ahs, pp->ahs_len, pq->pdu.hdr_dig);
}
if(sp->hdrDigest) {
debug(2, "hdr_dig=%x", pq->pdu.hdr_dig);
iv->iov_base = &pp->hdr_dig;
iv->iov_len = sizeof(int);
iv++;
}
if(pq->pdu.ds) {
iv->iov_base = pp->ds;
iv->iov_len = pp->ds_len;
while(iv->iov_len & 03) // the specs say it must be int alligned
iv->iov_len++;
iv++;
}
if(sp->dataDigest) {
pp->ds_dig = sp->dataDigest(pp->ds, pp->ds_len, 0);
iv->iov_base = &pp->ds_dig;
iv->iov_len = sizeof(int);
iv++;
}
uio->uio_iovcnt = iv - pq->iov;
sdebug(5, "opcode=%x iovcnt=%d uio_resid=%d itt=%x",
pp->ipdu.bhs.opcode, uio->uio_iovcnt, uio->uio_resid,
ntohl(pp->ipdu.bhs.itt));
sdebug(5, "sp=%p sp->soc=%p uio=%p sp->td=%p",
sp, sp->soc, uio, sp->td);
do {
len = uio->uio_resid;
error = sosend(sp->soc, NULL, uio, 0, 0, 0, sp->td);
if(uio->uio_resid == 0 || error || len == uio->uio_resid) {
if(uio->uio_resid) {
sdebug(2, "uio->uio_resid=%d uio->uio_iovcnt=%d error=%d len=%d",
uio->uio_resid, uio->uio_iovcnt, error, len);
if(error == 0)
error = EAGAIN; // 35
}
break;
}
/*
| XXX: untested code
*/
sdebug(1, "uio->uio_resid=%d uio->uio_iovcnt=%d",
uio->uio_resid, uio->uio_iovcnt);
iv = uio->uio_iov;
len -= uio->uio_resid;
while(uio->uio_iovcnt > 0) {
if(iv->iov_len > len) {
caddr_t bp = (caddr_t)iv->iov_base;
iv->iov_len -= len;
iv->iov_base = (void *)&bp[len];
break;
}
len -= iv->iov_len;
uio->uio_iovcnt--;
uio->uio_iov++;
iv++;
}
} while(uio->uio_resid);
if(error == 0) {
sp->stats.nsent++;
getbintime(&sp->stats.t_sent);
}
return error;
}
#endif /* USE_MBUF */
/*
| wait till a PDU header is received
| from the socket.
*/
/*
The format of the BHS is:
Byte/ 0 | 1 | 2 | 3 |
/ | | | |
|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|
+---------------+---------------+---------------+---------------+
0|.|I| Opcode |F| Opcode-specific fields |
+---------------+---------------+---------------+---------------+
4|TotalAHSLength | DataSegmentLength |
+---------------+---------------+---------------+---------------+
8| LUN or Opcode-specific fields |
+ +
12| |
+---------------+---------------+---------------+---------------+
16| Initiator Task Tag |
+---------------+---------------+---------------+---------------+
20/ Opcode-specific fields /
+/ /
+---------------+---------------+---------------+---------------+
48
*/
static __inline int
so_getbhs(isc_session_t *sp)
{
bhs_t *bhs = &sp->bhs;
struct uio *uio = &sp->uio;
struct iovec *iov = &sp->iov;
int error, flags;
debug_called(8);
iov->iov_base = bhs;
iov->iov_len = sizeof(bhs_t);
uio->uio_iov = iov;
uio->uio_iovcnt = 1;
uio->uio_rw = UIO_READ;
uio->uio_segflg = UIO_SYSSPACE;
uio->uio_td = curthread; // why ...
uio->uio_resid = sizeof(bhs_t);
flags = MSG_WAITALL;
error = soreceive(sp->soc, NULL, uio, 0, 0, &flags);
if(error)
debug(2, "error=%d so_error=%d uio->uio_resid=%d iov.iov_len=%zd",
error,
sp->soc->so_error, uio->uio_resid, iov->iov_len);
if(!error && (uio->uio_resid > 0)) {
error = EPIPE; // was EAGAIN
debug(2, "error=%d so_error=%d uio->uio_resid=%d iov.iov_len=%zd so_state=%x",
error,
sp->soc->so_error, uio->uio_resid, iov->iov_len, sp->soc->so_state);
}
return error;
}
/*
| so_recv gets called when there is at least
| an iSCSI header in the queue
*/
static int
so_recv(isc_session_t *sp, pduq_t *pq)
{
struct socket *so = sp->soc;
sn_t *sn = &sp->sn;
struct uio *uio = &pq->uio;
pdu_t *pp;
int error;
size_t n, len;
bhs_t *bhs;
u_int max, exp;
debug_called(8);
/*
| now calculate how much data should be in the buffer
| NOTE: digest is not verified/calculated - yet
*/
pp = &pq->pdu;
bhs = &pp->ipdu.bhs;
len = 0;
if(bhs->AHSLength) {
pp->ahs_len = bhs->AHSLength * 4;
len += pp->ahs_len;
}
if(sp->hdrDigest)
len += 4;
if(bhs->DSLength) {
n = bhs->DSLength;
#if BYTE_ORDER == LITTLE_ENDIAN
pp->ds_len = ((n & 0x00ff0000) >> 16)
| (n & 0x0000ff00)
| ((n & 0x000000ff) << 16);
#else
pp->ds_len = n;
#endif
len += pp->ds_len;
while(len & 03)
len++;
if(sp->dataDigest)
len += 4;
}
if((sp->opt.maxRecvDataSegmentLength > 0) && (len > sp->opt.maxRecvDataSegmentLength)) {
#if 0
xdebug("impossible PDU length(%d) opt.maxRecvDataSegmentLength=%d",
len, sp->opt.maxRecvDataSegmentLength);
// deep trouble here, probably all we can do is
// force a disconnect, XXX: check RFC ...
log(LOG_ERR,
"so_recv: impossible PDU length(%ld) from iSCSI %s/%s\n",
len, sp->opt.targetAddress, sp->opt.targetName);
#endif
/*
| XXX: this will really screwup the stream.
| should clear up the buffer till a valid header
| is found, or just close connection ...
| should read the RFC.
*/
error = E2BIG;
goto out;
}
if(len) {
int flags = MSG_WAITALL;
struct mbuf **mp;
mp = &pq->mp;
uio->uio_resid = len;
uio->uio_td = curthread; // why ...
if(sp->douio) {
// it's more efficient to use mbufs -- why?
if(bhs->opcode == ISCSI_READ_DATA) {
pduq_t *opq;
opq = i_search_hld(sp, pq->pdu.ipdu.bhs.itt, 1);
if(opq != NULL) {
union ccb *ccb = opq->ccb;
struct ccb_scsiio *csio = &ccb->csio;
pdu_t *opp = &opq->pdu;
scsi_req_t *cmd = &opp->ipdu.scsi_req;
data_in_t *rcmd = &pq->pdu.ipdu.data_in;
bhs_t *bhp = &opp->ipdu.bhs;
int r;
if(bhp->opcode == ISCSI_SCSI_CMD
&& cmd->R
&& (ntohl(cmd->edtlen) >= pq->pdu.ds_len)) {
struct iovec *iov = pq->iov;
iov->iov_base = csio->data_ptr + ntohl(rcmd->bo);
iov->iov_len = pq->pdu.ds_len;
uio->uio_rw = UIO_READ;
uio->uio_segflg = UIO_SYSSPACE;
uio->uio_iov = iov;
uio->uio_iovcnt = 1;
if(len > pq->pdu.ds_len) {
pq->iov[1].iov_base = &r;
pq->iov[1].iov_len = len - pq->pdu.ds_len;
uio->uio_iovcnt++;
}
mp = NULL;
sdebug(4, "uio_resid=0x%x itt=0x%x bp=%p bo=%x len=%x/%x",
uio->uio_resid,
ntohl(pq->pdu.ipdu.bhs.itt),
csio->data_ptr, ntohl(rcmd->bo), ntohl(cmd->edtlen), pq->pdu.ds_len);
}
}
}
}
error = soreceive(so, NULL, uio, mp, NULL, &flags);
//if(error == EAGAIN)
// XXX: this needs work! it hangs iscontrol
if(error || uio->uio_resid)
goto out;
}
pq->len += len;
sdebug(6, "len=%d] opcode=0x%x ahs_len=0x%x ds_len=0x%x",
pq->len, bhs->opcode, pp->ahs_len, pp->ds_len);
max = ntohl(bhs->MaxCmdSN);
exp = ntohl(bhs->ExpStSN);
if(max < exp - 1 &&
max > exp - _MAXINCR) {
sdebug(2, "bad cmd window size");
error = EIO; // XXX: for now;
goto out; // error
}
if(SNA_GT(max, sn->maxCmd))
sn->maxCmd = max;
if(SNA_GT(exp, sn->expCmd))
sn->expCmd = exp;
sp->cws = sn->maxCmd - sn->expCmd + 1;
return 0;
out:
// XXX: need some work here
xdebug("have a problem, error=%d", error);
pdu_free(sp->isc, pq);
if(!error && uio->uio_resid > 0)
error = EPIPE;
return error;
}
/*
| wait for something to arrive.
| and if the pdu is without errors, process it.
*/
static int
so_input(isc_session_t *sp)
{
pduq_t *pq;
int error;
debug_called(8);
/*
| first read in the iSCSI header
*/
error = so_getbhs(sp);
if(error == 0) {
/*
| now read the rest.
*/
pq = pdu_alloc(sp->isc, M_NOWAIT);
if(pq == NULL) { // XXX: might cause a deadlock ...
debug(3, "out of pdus, wait");
pq = pdu_alloc(sp->isc, M_NOWAIT); // OK to WAIT
}
pq->pdu.ipdu.bhs = sp->bhs;
pq->len = sizeof(bhs_t); // so far only the header was read
error = so_recv(sp, pq);
if(error != 0) {
error += 0x800; // XXX: just to see the error.
// terminal error
// XXX: close connection and exit
}
else {
sp->stats.nrecv++;
getbintime(&sp->stats.t_recv);
ism_recv(sp, pq);
}
}
return error;
}
/*
| one per active (connected) session.
| this thread is responsible for reading
| in packets from the target.
*/
static void
isc_soc(void *vp)
{
isc_session_t *sp = (isc_session_t *)vp;
struct socket *so = sp->soc;
int error;
debug_called(8);
sp->flags |= ISC_CON_RUNNING;
if(sp->cam_path)
ic_release(sp);
error = 0;
while((sp->flags & (ISC_CON_RUN | ISC_LINK_UP)) == (ISC_CON_RUN | ISC_LINK_UP)) {
// XXX: hunting ...
if(sp->soc == NULL || !(so->so_state & SS_ISCONNECTED)) {
debug(2, "sp->soc=%p", sp->soc);
break;
}
error = so_input(sp);
if(error == 0) {
mtx_lock(&sp->io_mtx);
if(sp->flags & ISC_OWAITING) {
wakeup(&sp->flags);
}
mtx_unlock(&sp->io_mtx);
} else if(error == EPIPE) {
break;
}
else if(error == EAGAIN) {
if(so->so_state & SS_ISCONNECTED)
// there seems to be a problem in 6.0 ...
tsleep(sp, PRIBIO, "isc_soc", 2*hz);
}
}
sdebug(2, "terminated, flags=%x so_count=%d so_state=%x error=%d proc=%p",
sp->flags, so->so_count, so->so_state, error, sp->proc);
if((sp->proc != NULL) && sp->signal) {
PROC_LOCK(sp->proc);
psignal(sp->proc, sp->signal);
PROC_UNLOCK(sp->proc);
sp->flags |= ISC_SIGNALED;
sdebug(2, "pid=%d signaled(%d)", sp->proc->p_pid, sp->signal);
}
else {
// we have to do something ourselves
// like closing this session ...
}
/*
| we've been terminated
*/
// do we need this mutex ...?
mtx_lock(&sp->io_mtx);
sp->flags &= ~(ISC_CON_RUNNING | ISC_LINK_UP);
wakeup(&sp->soc);
mtx_unlock(&sp->io_mtx);
sdebug(2, "dropped ISC_CON_RUNNING");
kproc_exit(0);
}
void
isc_stop_receiver(isc_session_t *sp)
{
int n;
debug_called(8);
sdebug(3, "sp=%p sp->soc=%p", sp, sp? sp->soc: 0);
mtx_lock(&sp->io_mtx);
sp->flags &= ~ISC_LINK_UP;
msleep(&sp->soc, &sp->io_mtx, PRIBIO|PDROP, "isc_stpc", 5*hz);
soshutdown(sp->soc, SHUT_RD);
mtx_lock(&sp->io_mtx);
sdebug(3, "soshutdown");
sp->flags &= ~ISC_CON_RUN;
n = 2;
while(n-- && (sp->flags & ISC_CON_RUNNING)) {
sdebug(3, "waiting n=%d... flags=%x", n, sp->flags);
msleep(&sp->soc, &sp->io_mtx, PRIBIO, "isc_stpc", 5*hz);
}
mtx_unlock(&sp->io_mtx);
if(sp->fp != NULL)
fdrop(sp->fp, sp->td);
fputsock(sp->soc);
sp->soc = NULL;
sp->fp = NULL;
sdebug(3, "done");
}
void
isc_start_receiver(isc_session_t *sp)
{
debug_called(8);
sp->flags |= ISC_CON_RUN | ISC_LINK_UP;
kproc_create(isc_soc, sp, &sp->soc_proc, 0, 0, "iscsi%d", sp->sid);
}
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