freebsd-skq/sys/cam/scsi/scsi_targ_bh.c
ken fce645c153 Add the CAM Target Layer (CTL).
CTL is a disk and processor device emulation subsystem originally written
for Copan Systems under Linux starting in 2003.  It has been shipping in
Copan (now SGI) products since 2005.

It was ported to FreeBSD in 2008, and thanks to an agreement between SGI
(who acquired Copan's assets in 2010) and Spectra Logic in 2010, CTL is
available under a BSD-style license.  The intent behind the agreement was
that Spectra would work to get CTL into the FreeBSD tree.

Some CTL features:

 - Disk and processor device emulation.
 - Tagged queueing
 - SCSI task attribute support (ordered, head of queue, simple tags)
 - SCSI implicit command ordering support.  (e.g. if a read follows a mode
   select, the read will be blocked until the mode select completes.)
 - Full task management support (abort, LUN reset, target reset, etc.)
 - Support for multiple ports
 - Support for multiple simultaneous initiators
 - Support for multiple simultaneous backing stores
 - Persistent reservation support
 - Mode sense/select support
 - Error injection support
 - High Availability support (1)
 - All I/O handled in-kernel, no userland context switch overhead.

(1) HA Support is just an API stub, and needs much more to be fully
    functional.

ctl.c:			The core of CTL.  Command handlers and processing,
			character driver, and HA support are here.

ctl.h:			Basic function declarations and data structures.

ctl_backend.c,
ctl_backend.h:		The basic CTL backend API.

ctl_backend_block.c,
ctl_backend_block.h:	The block and file backend.  This allows for using
			a disk or a file as the backing store for a LUN.
			Multiple threads are started to do I/O to the
			backing device, primarily because the VFS API
			requires that to get any concurrency.

ctl_backend_ramdisk.c:	A "fake" ramdisk backend.  It only allocates a
			small amount of memory to act as a source and sink
			for reads and writes from an initiator.  Therefore
			it cannot be used for any real data, but it can be
			used to test for throughput.  It can also be used
			to test initiators' support for extremely large LUNs.

ctl_cmd_table.c:	This is a table with all 256 possible SCSI opcodes,
			and command handler functions defined for supported
			opcodes.

ctl_debug.h:		Debugging support.

ctl_error.c,
ctl_error.h:		CTL-specific wrappers around the CAM sense building
			functions.

ctl_frontend.c,
ctl_frontend.h:		These files define the basic CTL frontend port API.

ctl_frontend_cam_sim.c:	This is a CTL frontend port that is also a CAM SIM.
			This frontend allows for using CTL without any
			target-capable hardware.  So any LUNs you create in
			CTL are visible in CAM via this port.

ctl_frontend_internal.c,
ctl_frontend_internal.h:
			This is a frontend port written for Copan to do
			some system-specific tasks that required sending
			commands into CTL from inside the kernel.  This
			isn't entirely relevant to FreeBSD in general,
			but can perhaps be repurposed.

ctl_ha.h:		This is a stubbed-out High Availability API.  Much
			more is needed for full HA support.  See the
			comments in the header and the description of what
			is needed in the README.ctl.txt file for more
			details.

ctl_io.h:		This defines most of the core CTL I/O structures.
			union ctl_io is conceptually very similar to CAM's
			union ccb.

ctl_ioctl.h:		This defines all ioctls available through the CTL
			character device, and the data structures needed
			for those ioctls.

ctl_mem_pool.c,
ctl_mem_pool.h:		Generic memory pool implementation used by the
			internal frontend.

ctl_private.h:		Private data structres (e.g. CTL softc) and
			function prototypes.  This also includes the SCSI
			vendor and product names used by CTL.

ctl_scsi_all.c,
ctl_scsi_all.h:		CTL wrappers around CAM sense printing functions.

ctl_ser_table.c:	Command serialization table.  This defines what
			happens when one type of command is followed by
			another type of command.

ctl_util.c,
ctl_util.h:		CTL utility functions, primarily designed to be
			used from userland.  See ctladm for the primary
			consumer of these functions.  These include CDB
			building functions.

scsi_ctl.c:		CAM target peripheral driver and CTL frontend port.
			This is the path into CTL for commands from
			target-capable hardware/SIMs.

README.ctl.txt:		CTL code features, roadmap, to-do list.

usr.sbin/Makefile:	Add ctladm.

ctladm/Makefile,
ctladm/ctladm.8,
ctladm/ctladm.c,
ctladm/ctladm.h,
ctladm/util.c:		ctladm(8) is the CTL management utility.
			It fills a role similar to camcontrol(8).
			It allow configuring LUNs, issuing commands,
			injecting errors and various other control
			functions.

usr.bin/Makefile:	Add ctlstat.

ctlstat/Makefile
ctlstat/ctlstat.8,
ctlstat/ctlstat.c:	ctlstat(8) fills a role similar to iostat(8).
			It reports I/O statistics for CTL.

sys/conf/files:		Add CTL files.

sys/conf/NOTES:		Add device ctl.

sys/cam/scsi_all.h:	To conform to more recent specs, the inquiry CDB
			length field is now 2 bytes long.

			Add several mode page definitions for CTL.

sys/cam/scsi_all.c:	Handle the new 2 byte inquiry length.

sys/dev/ciss/ciss.c,
sys/dev/ata/atapi-cam.c,
sys/cam/scsi/scsi_targ_bh.c,
scsi_target/scsi_cmds.c,
mlxcontrol/interface.c:	Update for 2 byte inquiry length field.

scsi_da.h:		Add versions of the format and rigid disk pages
			that are in a more reasonable format for CTL.

amd64/conf/GENERIC,
i386/conf/GENERIC,
ia64/conf/GENERIC,
sparc64/conf/GENERIC:	Add device ctl.

i386/conf/PAE:		The CTL frontend SIM at least does not compile
			cleanly on PAE.

Sponsored by:	Copan Systems, SGI and Spectra Logic
MFC after:	1 month
2012-01-12 00:34:33 +00:00

782 lines
21 KiB
C

/*-
* Implementation of the Target Mode 'Black Hole device' for CAM.
*
* Copyright (c) 1999 Justin T. Gibbs.
* 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,
* without modification, immediately at the beginning of the file.
* 2. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/queue.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/types.h>
#include <sys/bio.h>
#include <sys/conf.h>
#include <sys/devicestat.h>
#include <sys/malloc.h>
#include <sys/uio.h>
#include <cam/cam.h>
#include <cam/cam_ccb.h>
#include <cam/cam_periph.h>
#include <cam/cam_queue.h>
#include <cam/cam_xpt_periph.h>
#include <cam/cam_debug.h>
#include <cam/cam_sim.h>
#include <cam/scsi/scsi_all.h>
#include <cam/scsi/scsi_message.h>
static MALLOC_DEFINE(M_SCSIBH, "SCSI bh", "SCSI blackhole buffers");
typedef enum {
TARGBH_STATE_NORMAL,
TARGBH_STATE_EXCEPTION,
TARGBH_STATE_TEARDOWN
} targbh_state;
typedef enum {
TARGBH_FLAG_NONE = 0x00,
TARGBH_FLAG_LUN_ENABLED = 0x01
} targbh_flags;
typedef enum {
TARGBH_CCB_WORKQ,
TARGBH_CCB_WAITING
} targbh_ccb_types;
#define MAX_ACCEPT 8
#define MAX_IMMEDIATE 16
#define MAX_BUF_SIZE 256 /* Max inquiry/sense/mode page transfer */
/* Offsets into our private CCB area for storing accept information */
#define ccb_type ppriv_field0
#define ccb_descr ppriv_ptr1
/* We stick a pointer to the originating accept TIO in each continue I/O CCB */
#define ccb_atio ppriv_ptr1
TAILQ_HEAD(ccb_queue, ccb_hdr);
struct targbh_softc {
struct ccb_queue pending_queue;
struct ccb_queue work_queue;
struct ccb_queue unknown_atio_queue;
struct devstat device_stats;
targbh_state state;
targbh_flags flags;
u_int init_level;
u_int inq_data_len;
struct ccb_accept_tio *accept_tio_list;
struct ccb_hdr_slist immed_notify_slist;
};
struct targbh_cmd_desc {
struct ccb_accept_tio* atio_link;
u_int data_resid; /* How much left to transfer */
u_int data_increment;/* Amount to send before next disconnect */
void* data; /* The data. Can be from backing_store or not */
void* backing_store;/* Backing store allocated for this descriptor*/
u_int max_size; /* Size of backing_store */
u_int32_t timeout;
u_int8_t status; /* Status to return to initiator */
};
static struct scsi_inquiry_data no_lun_inq_data =
{
T_NODEVICE | (SID_QUAL_BAD_LU << 5), 0,
/* version */2, /* format version */2
};
static struct scsi_sense_data_fixed no_lun_sense_data =
{
SSD_CURRENT_ERROR|SSD_ERRCODE_VALID,
0,
SSD_KEY_NOT_READY,
{ 0, 0, 0, 0 },
/*extra_len*/offsetof(struct scsi_sense_data_fixed, fru)
- offsetof(struct scsi_sense_data_fixed, extra_len),
{ 0, 0, 0, 0 },
/* Logical Unit Not Supported */
/*ASC*/0x25, /*ASCQ*/0
};
static const int request_sense_size = offsetof(struct scsi_sense_data_fixed, fru);
static periph_init_t targbhinit;
static void targbhasync(void *callback_arg, u_int32_t code,
struct cam_path *path, void *arg);
static cam_status targbhenlun(struct cam_periph *periph);
static cam_status targbhdislun(struct cam_periph *periph);
static periph_ctor_t targbhctor;
static periph_dtor_t targbhdtor;
static periph_start_t targbhstart;
static void targbhdone(struct cam_periph *periph,
union ccb *done_ccb);
#ifdef NOTYET
static int targbherror(union ccb *ccb, u_int32_t cam_flags,
u_int32_t sense_flags);
#endif
static struct targbh_cmd_desc* targbhallocdescr(void);
static void targbhfreedescr(struct targbh_cmd_desc *buf);
static struct periph_driver targbhdriver =
{
targbhinit, "targbh",
TAILQ_HEAD_INITIALIZER(targbhdriver.units), /* generation */ 0
};
PERIPHDRIVER_DECLARE(targbh, targbhdriver);
static void
targbhinit(void)
{
cam_status status;
/*
* Install a global async callback. This callback will
* receive async callbacks like "new path registered".
*/
status = xpt_register_async(AC_PATH_REGISTERED | AC_PATH_DEREGISTERED,
targbhasync, NULL, NULL);
if (status != CAM_REQ_CMP) {
printf("targbh: Failed to attach master async callback "
"due to status 0x%x!\n", status);
}
}
static void
targbhasync(void *callback_arg, u_int32_t code,
struct cam_path *path, void *arg)
{
struct cam_path *new_path;
struct ccb_pathinq *cpi;
path_id_t bus_path_id;
cam_status status;
cpi = (struct ccb_pathinq *)arg;
if (code == AC_PATH_REGISTERED)
bus_path_id = cpi->ccb_h.path_id;
else
bus_path_id = xpt_path_path_id(path);
/*
* Allocate a peripheral instance for
* this target instance.
*/
status = xpt_create_path(&new_path, NULL,
bus_path_id,
CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
if (status != CAM_REQ_CMP) {
printf("targbhasync: Unable to create path "
"due to status 0x%x\n", status);
return;
}
switch (code) {
case AC_PATH_REGISTERED:
{
/* Only attach to controllers that support target mode */
if ((cpi->target_sprt & PIT_PROCESSOR) == 0)
break;
status = cam_periph_alloc(targbhctor, NULL, targbhdtor,
targbhstart,
"targbh", CAM_PERIPH_BIO,
new_path, targbhasync,
AC_PATH_REGISTERED,
cpi);
break;
}
case AC_PATH_DEREGISTERED:
{
struct cam_periph *periph;
if ((periph = cam_periph_find(new_path, "targbh")) != NULL)
cam_periph_invalidate(periph);
break;
}
default:
break;
}
xpt_free_path(new_path);
}
/* Attempt to enable our lun */
static cam_status
targbhenlun(struct cam_periph *periph)
{
union ccb immed_ccb;
struct targbh_softc *softc;
cam_status status;
int i;
softc = (struct targbh_softc *)periph->softc;
if ((softc->flags & TARGBH_FLAG_LUN_ENABLED) != 0)
return (CAM_REQ_CMP);
xpt_setup_ccb(&immed_ccb.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
immed_ccb.ccb_h.func_code = XPT_EN_LUN;
/* Don't need support for any vendor specific commands */
immed_ccb.cel.grp6_len = 0;
immed_ccb.cel.grp7_len = 0;
immed_ccb.cel.enable = 1;
xpt_action(&immed_ccb);
status = immed_ccb.ccb_h.status;
if (status != CAM_REQ_CMP) {
xpt_print(periph->path,
"targbhenlun - Enable Lun Rejected with status 0x%x\n",
status);
return (status);
}
softc->flags |= TARGBH_FLAG_LUN_ENABLED;
/*
* Build up a buffer of accept target I/O
* operations for incoming selections.
*/
for (i = 0; i < MAX_ACCEPT; i++) {
struct ccb_accept_tio *atio;
atio = (struct ccb_accept_tio*)malloc(sizeof(*atio), M_SCSIBH,
M_NOWAIT);
if (atio == NULL) {
status = CAM_RESRC_UNAVAIL;
break;
}
atio->ccb_h.ccb_descr = targbhallocdescr();
if (atio->ccb_h.ccb_descr == NULL) {
free(atio, M_SCSIBH);
status = CAM_RESRC_UNAVAIL;
break;
}
xpt_setup_ccb(&atio->ccb_h, periph->path, CAM_PRIORITY_NORMAL);
atio->ccb_h.func_code = XPT_ACCEPT_TARGET_IO;
atio->ccb_h.cbfcnp = targbhdone;
xpt_action((union ccb *)atio);
status = atio->ccb_h.status;
if (status != CAM_REQ_INPROG) {
targbhfreedescr(atio->ccb_h.ccb_descr);
free(atio, M_SCSIBH);
break;
}
((struct targbh_cmd_desc*)atio->ccb_h.ccb_descr)->atio_link =
softc->accept_tio_list;
softc->accept_tio_list = atio;
}
if (i == 0) {
xpt_print(periph->path,
"targbhenlun - Could not allocate accept tio CCBs: status "
"= 0x%x\n", status);
targbhdislun(periph);
return (CAM_REQ_CMP_ERR);
}
/*
* Build up a buffer of immediate notify CCBs
* so the SIM can tell us of asynchronous target mode events.
*/
for (i = 0; i < MAX_ACCEPT; i++) {
struct ccb_immed_notify *inot;
inot = (struct ccb_immed_notify*)malloc(sizeof(*inot), M_SCSIBH,
M_NOWAIT);
if (inot == NULL) {
status = CAM_RESRC_UNAVAIL;
break;
}
xpt_setup_ccb(&inot->ccb_h, periph->path, CAM_PRIORITY_NORMAL);
inot->ccb_h.func_code = XPT_IMMED_NOTIFY;
inot->ccb_h.cbfcnp = targbhdone;
xpt_action((union ccb *)inot);
status = inot->ccb_h.status;
if (status != CAM_REQ_INPROG) {
free(inot, M_SCSIBH);
break;
}
SLIST_INSERT_HEAD(&softc->immed_notify_slist, &inot->ccb_h,
periph_links.sle);
}
if (i == 0) {
xpt_print(periph->path,
"targbhenlun - Could not allocate immediate notify "
"CCBs: status = 0x%x\n", status);
targbhdislun(periph);
return (CAM_REQ_CMP_ERR);
}
return (CAM_REQ_CMP);
}
static cam_status
targbhdislun(struct cam_periph *periph)
{
union ccb ccb;
struct targbh_softc *softc;
struct ccb_accept_tio* atio;
struct ccb_hdr *ccb_h;
softc = (struct targbh_softc *)periph->softc;
if ((softc->flags & TARGBH_FLAG_LUN_ENABLED) == 0)
return CAM_REQ_CMP;
/* XXX Block for Continue I/O completion */
/* Kill off all ACCECPT and IMMEDIATE CCBs */
while ((atio = softc->accept_tio_list) != NULL) {
softc->accept_tio_list =
((struct targbh_cmd_desc*)atio->ccb_h.ccb_descr)->atio_link;
xpt_setup_ccb(&ccb.cab.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
ccb.cab.ccb_h.func_code = XPT_ABORT;
ccb.cab.abort_ccb = (union ccb *)atio;
xpt_action(&ccb);
}
while ((ccb_h = SLIST_FIRST(&softc->immed_notify_slist)) != NULL) {
SLIST_REMOVE_HEAD(&softc->immed_notify_slist, periph_links.sle);
xpt_setup_ccb(&ccb.cab.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
ccb.cab.ccb_h.func_code = XPT_ABORT;
ccb.cab.abort_ccb = (union ccb *)ccb_h;
xpt_action(&ccb);
}
/*
* Dissable this lun.
*/
xpt_setup_ccb(&ccb.cel.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
ccb.cel.ccb_h.func_code = XPT_EN_LUN;
ccb.cel.enable = 0;
xpt_action(&ccb);
if (ccb.cel.ccb_h.status != CAM_REQ_CMP)
printf("targbhdislun - Disabling lun on controller failed "
"with status 0x%x\n", ccb.cel.ccb_h.status);
else
softc->flags &= ~TARGBH_FLAG_LUN_ENABLED;
return (ccb.cel.ccb_h.status);
}
static cam_status
targbhctor(struct cam_periph *periph, void *arg)
{
struct targbh_softc *softc;
/* Allocate our per-instance private storage */
softc = (struct targbh_softc *)malloc(sizeof(*softc),
M_SCSIBH, M_NOWAIT);
if (softc == NULL) {
printf("targctor: unable to malloc softc\n");
return (CAM_REQ_CMP_ERR);
}
bzero(softc, sizeof(*softc));
TAILQ_INIT(&softc->pending_queue);
TAILQ_INIT(&softc->work_queue);
softc->accept_tio_list = NULL;
SLIST_INIT(&softc->immed_notify_slist);
softc->state = TARGBH_STATE_NORMAL;
periph->softc = softc;
softc->init_level++;
return (targbhenlun(periph));
}
static void
targbhdtor(struct cam_periph *periph)
{
struct targbh_softc *softc;
softc = (struct targbh_softc *)periph->softc;
softc->state = TARGBH_STATE_TEARDOWN;
targbhdislun(periph);
switch (softc->init_level) {
case 0:
panic("targdtor - impossible init level");
case 1:
/* FALLTHROUGH */
default:
/* XXX Wait for callback of targbhdislun() */
msleep(softc, periph->sim->mtx, PRIBIO, "targbh", hz/2);
free(softc, M_SCSIBH);
break;
}
}
static void
targbhstart(struct cam_periph *periph, union ccb *start_ccb)
{
struct targbh_softc *softc;
struct ccb_hdr *ccbh;
struct ccb_accept_tio *atio;
struct targbh_cmd_desc *desc;
struct ccb_scsiio *csio;
ccb_flags flags;
softc = (struct targbh_softc *)periph->softc;
ccbh = TAILQ_FIRST(&softc->work_queue);
if (periph->immediate_priority <= periph->pinfo.priority) {
start_ccb->ccb_h.ccb_type = TARGBH_CCB_WAITING;
SLIST_INSERT_HEAD(&periph->ccb_list, &start_ccb->ccb_h,
periph_links.sle);
periph->immediate_priority = CAM_PRIORITY_NONE;
wakeup(&periph->ccb_list);
} else if (ccbh == NULL) {
xpt_release_ccb(start_ccb);
} else {
TAILQ_REMOVE(&softc->work_queue, ccbh, periph_links.tqe);
TAILQ_INSERT_HEAD(&softc->pending_queue, ccbh,
periph_links.tqe);
atio = (struct ccb_accept_tio*)ccbh;
desc = (struct targbh_cmd_desc *)atio->ccb_h.ccb_descr;
/* Is this a tagged request? */
flags = atio->ccb_h.flags &
(CAM_DIS_DISCONNECT|CAM_TAG_ACTION_VALID|CAM_DIR_MASK);
csio = &start_ccb->csio;
/*
* If we are done with the transaction, tell the
* controller to send status and perform a CMD_CMPLT.
* If we have associated sense data, see if we can
* send that too.
*/
if (desc->data_resid == desc->data_increment) {
flags |= CAM_SEND_STATUS;
if (atio->sense_len) {
csio->sense_len = atio->sense_len;
csio->sense_data = atio->sense_data;
flags |= CAM_SEND_SENSE;
}
}
cam_fill_ctio(csio,
/*retries*/2,
targbhdone,
flags,
(flags & CAM_TAG_ACTION_VALID)?
MSG_SIMPLE_Q_TAG : 0,
atio->tag_id,
atio->init_id,
desc->status,
/*data_ptr*/desc->data_increment == 0
? NULL : desc->data,
/*dxfer_len*/desc->data_increment,
/*timeout*/desc->timeout);
/* Override our wildcard attachment */
start_ccb->ccb_h.target_id = atio->ccb_h.target_id;
start_ccb->ccb_h.target_lun = atio->ccb_h.target_lun;
start_ccb->ccb_h.ccb_type = TARGBH_CCB_WORKQ;
start_ccb->ccb_h.ccb_atio = atio;
CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
("Sending a CTIO\n"));
xpt_action(start_ccb);
/*
* If the queue was frozen waiting for the response
* to this ATIO (for instance disconnection was disallowed),
* then release it now that our response has been queued.
*/
if ((atio->ccb_h.status & CAM_DEV_QFRZN) != 0) {
cam_release_devq(periph->path,
/*relsim_flags*/0,
/*reduction*/0,
/*timeout*/0,
/*getcount_only*/0);
atio->ccb_h.status &= ~CAM_DEV_QFRZN;
}
ccbh = TAILQ_FIRST(&softc->work_queue);
}
if (ccbh != NULL)
xpt_schedule(periph, CAM_PRIORITY_NORMAL);
}
static void
targbhdone(struct cam_periph *periph, union ccb *done_ccb)
{
struct targbh_softc *softc;
softc = (struct targbh_softc *)periph->softc;
if (done_ccb->ccb_h.ccb_type == TARGBH_CCB_WAITING) {
/* Caller will release the CCB */
wakeup(&done_ccb->ccb_h.cbfcnp);
return;
}
switch (done_ccb->ccb_h.func_code) {
case XPT_ACCEPT_TARGET_IO:
{
struct ccb_accept_tio *atio;
struct targbh_cmd_desc *descr;
u_int8_t *cdb;
int priority;
atio = &done_ccb->atio;
descr = (struct targbh_cmd_desc*)atio->ccb_h.ccb_descr;
cdb = atio->cdb_io.cdb_bytes;
if (softc->state == TARGBH_STATE_TEARDOWN
|| atio->ccb_h.status == CAM_REQ_ABORTED) {
targbhfreedescr(descr);
xpt_free_ccb(done_ccb);
return;
}
/*
* Determine the type of incoming command and
* setup our buffer for a response.
*/
switch (cdb[0]) {
case INQUIRY:
{
struct scsi_inquiry *inq;
inq = (struct scsi_inquiry *)cdb;
CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
("Saw an inquiry!\n"));
/*
* Validate the command. We don't
* support any VPD pages, so complain
* if EVPD is set.
*/
if ((inq->byte2 & SI_EVPD) != 0
|| inq->page_code != 0) {
atio->ccb_h.flags &= ~CAM_DIR_MASK;
atio->ccb_h.flags |= CAM_DIR_NONE;
/*
* This needs to have other than a
* no_lun_sense_data response.
*/
bcopy(&no_lun_sense_data, &atio->sense_data,
min(sizeof(no_lun_sense_data),
sizeof(atio->sense_data)));
atio->sense_len = sizeof(no_lun_sense_data);
descr->data_resid = 0;
descr->data_increment = 0;
descr->status = SCSI_STATUS_CHECK_COND;
break;
}
/*
* Direction is always relative
* to the initator.
*/
atio->ccb_h.flags &= ~CAM_DIR_MASK;
atio->ccb_h.flags |= CAM_DIR_IN;
descr->data = &no_lun_inq_data;
descr->data_resid = MIN(sizeof(no_lun_inq_data),
scsi_2btoul(inq->length));
descr->data_increment = descr->data_resid;
descr->timeout = 5 * 1000;
descr->status = SCSI_STATUS_OK;
break;
}
case REQUEST_SENSE:
{
struct scsi_request_sense *rsense;
rsense = (struct scsi_request_sense *)cdb;
/* Refer to static sense data */
atio->ccb_h.flags &= ~CAM_DIR_MASK;
atio->ccb_h.flags |= CAM_DIR_IN;
descr->data = &no_lun_sense_data;
descr->data_resid = request_sense_size;
descr->data_resid = MIN(descr->data_resid,
SCSI_CDB6_LEN(rsense->length));
descr->data_increment = descr->data_resid;
descr->timeout = 5 * 1000;
descr->status = SCSI_STATUS_OK;
break;
}
default:
/* Constant CA, tell initiator */
/* Direction is always relative to the initator */
atio->ccb_h.flags &= ~CAM_DIR_MASK;
atio->ccb_h.flags |= CAM_DIR_NONE;
bcopy(&no_lun_sense_data, &atio->sense_data,
min(sizeof(no_lun_sense_data),
sizeof(atio->sense_data)));
atio->sense_len = sizeof (no_lun_sense_data);
descr->data_resid = 0;
descr->data_increment = 0;
descr->timeout = 5 * 1000;
descr->status = SCSI_STATUS_CHECK_COND;
break;
}
/* Queue us up to receive a Continue Target I/O ccb. */
if ((atio->ccb_h.flags & CAM_DIS_DISCONNECT) != 0) {
TAILQ_INSERT_HEAD(&softc->work_queue, &atio->ccb_h,
periph_links.tqe);
priority = 0;
} else {
TAILQ_INSERT_TAIL(&softc->work_queue, &atio->ccb_h,
periph_links.tqe);
priority = CAM_PRIORITY_NORMAL;
}
xpt_schedule(periph, priority);
break;
}
case XPT_CONT_TARGET_IO:
{
struct ccb_accept_tio *atio;
struct targbh_cmd_desc *desc;
CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
("Received completed CTIO\n"));
atio = (struct ccb_accept_tio*)done_ccb->ccb_h.ccb_atio;
desc = (struct targbh_cmd_desc *)atio->ccb_h.ccb_descr;
TAILQ_REMOVE(&softc->pending_queue, &atio->ccb_h,
periph_links.tqe);
/*
* We could check for CAM_SENT_SENSE bein set here,
* but since we're not maintaining any CA/UA state,
* there's no point.
*/
atio->sense_len = 0;
done_ccb->ccb_h.flags &= ~CAM_SEND_SENSE;
done_ccb->ccb_h.status &= ~CAM_SENT_SENSE;
/*
* Any errors will not change the data we return,
* so make sure the queue is not left frozen.
* XXX - At some point there may be errors that
* leave us in a connected state with the
* initiator...
*/
if ((done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0) {
printf("Releasing Queue\n");
cam_release_devq(done_ccb->ccb_h.path,
/*relsim_flags*/0,
/*reduction*/0,
/*timeout*/0,
/*getcount_only*/0);
done_ccb->ccb_h.status &= ~CAM_DEV_QFRZN;
}
desc->data_resid -= desc->data_increment;
xpt_release_ccb(done_ccb);
if (softc->state != TARGBH_STATE_TEARDOWN) {
/*
* Send the original accept TIO back to the
* controller to handle more work.
*/
CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
("Returning ATIO to target\n"));
/* Restore wildcards */
atio->ccb_h.target_id = CAM_TARGET_WILDCARD;
atio->ccb_h.target_lun = CAM_LUN_WILDCARD;
xpt_action((union ccb *)atio);
break;
} else {
targbhfreedescr(desc);
free(atio, M_SCSIBH);
}
break;
}
case XPT_IMMED_NOTIFY:
{
int frozen;
frozen = (done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0;
if (softc->state == TARGBH_STATE_TEARDOWN
|| done_ccb->ccb_h.status == CAM_REQ_ABORTED) {
printf("Freed an immediate notify\n");
xpt_free_ccb(done_ccb);
} else {
/* Requeue for another immediate event */
xpt_action(done_ccb);
}
if (frozen != 0)
cam_release_devq(periph->path,
/*relsim_flags*/0,
/*opening reduction*/0,
/*timeout*/0,
/*getcount_only*/0);
break;
}
default:
panic("targbhdone: Unexpected ccb opcode");
break;
}
}
#ifdef NOTYET
static int
targbherror(union ccb *ccb, u_int32_t cam_flags, u_int32_t sense_flags)
{
return 0;
}
#endif
static struct targbh_cmd_desc*
targbhallocdescr()
{
struct targbh_cmd_desc* descr;
/* Allocate the targbh_descr structure */
descr = (struct targbh_cmd_desc *)malloc(sizeof(*descr),
M_SCSIBH, M_NOWAIT);
if (descr == NULL)
return (NULL);
bzero(descr, sizeof(*descr));
/* Allocate buffer backing store */
descr->backing_store = malloc(MAX_BUF_SIZE, M_SCSIBH, M_NOWAIT);
if (descr->backing_store == NULL) {
free(descr, M_SCSIBH);
return (NULL);
}
descr->max_size = MAX_BUF_SIZE;
return (descr);
}
static void
targbhfreedescr(struct targbh_cmd_desc *descr)
{
free(descr->backing_store, M_SCSIBH);
free(descr, M_SCSIBH);
}