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freebsd-skq/sys/cam/ctl/ctl_backend.h
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

289 lines
11 KiB
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/*-
* Copyright (c) 2003 Silicon Graphics International Corp.
* 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.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* substantially similar to the "NO WARRANTY" disclaimer below
* ("Disclaimer") and any redistribution must be conditioned upon
* including a substantially similar Disclaimer requirement for further
* binary redistribution.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR 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 DAMAGES.
*
* $Id: //depot/users/kenm/FreeBSD-test2/sys/cam/ctl/ctl_backend.h#2 $
* $FreeBSD$
*/
/*
* CTL backend driver definitions
*
* Author: Ken Merry <ken@FreeBSD.org>
*/
#ifndef _CTL_BACKEND_H_
#define _CTL_BACKEND_H_
/*
* XXX KDM move this to another header file?
*/
#define CTL_BE_NAME_LEN 32
/*
* The ID_REQ flag is used to say that the caller has requested a
* particular LUN ID in the req_lun_id field. If we cannot allocate that
* LUN ID, the ctl_add_lun() call will fail.
*
* The POWERED_OFF flag tells us that the LUN should default to the powered
* off state. It will return 0x04,0x02 until it is powered up. ("Logical
* unit not ready, initializing command required.")
*
* The INOPERABLE flag tells us that this LUN is not operable for whatever
* reason. This means that user data may have been (or has been?) lost.
* We will return 0x31,0x00 ("Medium format corrupted") until the host
* issues a FORMAT UNIT command to clear the error.
*
* The PRIMARY flag tells us that this LUN is registered as a Primary LUN
* which is accessible via the Master shelf controller in an HA. This flag
* being set indicates a Primary LUN. This flag being reset represents a
* Secondary LUN controlled by the Secondary controller in an HA
* configuration. Flag is applicable at this time to T_DIRECT types.
*
* The SERIAL_NUM flag tells us that the serial_num field is filled in and
* valid for use in SCSI INQUIRY VPD page 0x80.
*
* The DEVID flag tells us that the device_id field is filled in and
* valid for use in SCSI INQUIRY VPD page 0x83.
*
* The DEV_TYPE flag tells us that the device_type field is filled in.
*/
typedef enum {
CTL_LUN_FLAG_ID_REQ = 0x01,
CTL_LUN_FLAG_POWERED_OFF = 0x02,
CTL_LUN_FLAG_INOPERABLE = 0x04,
CTL_LUN_FLAG_PRIMARY = 0x08,
CTL_LUN_FLAG_SERIAL_NUM = 0x10,
CTL_LUN_FLAG_DEVID = 0x20,
CTL_LUN_FLAG_DEV_TYPE = 0x40
} ctl_backend_lun_flags;
#ifdef _KERNEL
#define CTL_BACKEND_DECLARE(name, driver) \
static int name ## _modevent(module_t mod, int type, void *data) \
{ \
switch (type) { \
case MOD_LOAD: \
ctl_backend_register( \
(struct ctl_backend_driver *)data); \
break; \
case MOD_UNLOAD: \
printf(#name " module unload - not possible for this module type\n"); \
return EINVAL; \
default: \
return EOPNOTSUPP; \
} \
return 0; \
} \
static moduledata_t name ## _mod = { \
#name, \
name ## _modevent, \
(void *)&driver \
}; \
DECLARE_MODULE(name, name ## _mod, SI_SUB_CONFIGURE, SI_ORDER_FOURTH); \
MODULE_DEPEND(name, ctl, 1, 1, 1); \
MODULE_DEPEND(name, cam, 1, 1, 1)
typedef enum {
CTL_LUN_CONFIG_OK,
CTL_LUN_CONFIG_FAILURE
} ctl_lun_config_status;
typedef void (*be_callback_t)(void *be_lun);
typedef void (*be_lun_config_t)(void *be_lun,
ctl_lun_config_status status);
/*
* The lun_type field is the SCSI device type of this particular LUN. In
* general, this should be T_DIRECT, although backends will want to create
* a processor LUN, typically at LUN 0. See scsi_all.h for the defines for
* the various SCSI device types.
*
* The flags are described above.
*
* The be_lun field is the backend driver's own context that will get
* passsed back so that it can tell which LUN CTL is referencing.
*
* maxlba is the maximum accessible LBA on the LUN. Note that this is
* different from the capacity of the array. capacity = maxlba + 1
*
* blocksize is the size, in bytes, of each LBA on the LUN. In general
* this should be 512. In theory CTL should be able to handle other block
* sizes. Host application software may not deal with it very well, though.
*
* req_lun_id is the requested LUN ID. CTL only pays attention to this
* field if the CTL_LUN_FLAG_ID_REQ flag is set. If the requested LUN ID is
* not available, the LUN addition will fail. If a particular LUN ID isn't
* requested, the first available LUN ID will be allocated.
*
* serial_num is the device serial number returned in the SCSI INQUIRY VPD
* page 0x80. This should be a unique, per-shelf value. The data inside
* this field should be ASCII only, left aligned, and any unused space
* should be padded out with ASCII spaces. This field should NOT be NULL
* terminated.
*
* device_id is the T10 device identifier returned in the SCSI INQUIRY VPD
* page 0x83. This should be a unique, per-LUN value. The data inside
* this field should be ASCII only, left aligned, and any unused space
* should be padded with ASCII spaces. This field should NOT be NULL
* terminated.
*
* The lun_shutdown() method is the callback for the ctl_invalidate_lun()
* call. It is called when all outstanding I/O for that LUN has been
* completed and CTL has deleted the resources for that LUN. When the CTL
* backend gets this call, it can safely free its per-LUN resources.
*
* The lun_config_status() method is the callback for the ctl_add_lun()
* call. It is called when the LUN is successfully added, or when LUN
* addition fails. If the LUN is successfully added, the backend may call
* the ctl_enable_lun() method to enable the LUN.
*
* The be field is a pointer to the ctl_backend_driver structure, which
* contains the backend methods to be called by CTL.
*
* The ctl_lun field is for CTL internal use only, and should not be used
* by the backend.
*
* The links field is for CTL internal use only, and should not be used by
* the backend.
*/
struct ctl_be_lun {
uint8_t lun_type; /* passed to CTL */
ctl_backend_lun_flags flags; /* passed to CTL */
void *be_lun; /* passed to CTL */
uint64_t maxlba; /* passed to CTL */
uint32_t blocksize; /* passed to CTL */
uint32_t req_lun_id; /* passed to CTL */
uint32_t lun_id; /* returned from CTL */
uint8_t serial_num[CTL_SN_LEN]; /* passed to CTL */
uint8_t device_id[CTL_DEVID_LEN];/* passed to CTL */
be_callback_t lun_shutdown; /* passed to CTL */
be_lun_config_t lun_config_status; /* passed to CTL */
struct ctl_backend_driver *be; /* passed to CTL */
void *ctl_lun; /* used by CTL */
STAILQ_ENTRY(ctl_be_lun) links; /* used by CTL */
};
typedef enum {
CTL_BE_FLAG_NONE = 0x00, /* no flags */
CTL_BE_FLAG_HAS_CONFIG = 0x01, /* can do config reads, writes */
CTL_BE_FLAG_INTERNAL = 0x02 /* don't inc mod refcount */
} ctl_backend_flags;
typedef int (*be_init_t)(void);
typedef int (*be_func_t)(union ctl_io *io);
typedef void (*be_vfunc_t)(union ctl_io *io);
typedef int (*be_ioctl_t)(struct cdev *dev, u_long cmd, caddr_t addr, int flag,
struct thread *td);
typedef int (*be_luninfo_t)(void *be_lun, struct sbuf *sb);
struct ctl_backend_driver {
char name[CTL_BE_NAME_LEN]; /* passed to CTL */
ctl_backend_flags flags; /* passed to CTL */
be_init_t init; /* passed to CTL */
be_func_t data_submit; /* passed to CTL */
be_func_t data_move_done; /* passed to CTL */
be_func_t config_read; /* passed to CTL */
be_func_t config_write; /* passed to CTL */
be_ioctl_t ioctl; /* passed to CTL */
be_luninfo_t lun_info; /* passed to CTL */
#ifdef CS_BE_CONFIG_MOVE_DONE_IS_NOT_USED
be_func_t config_move_done; /* passed to backend */
#endif
#if 0
be_vfunc_t config_write_done; /* passed to backend */
#endif
u_int num_luns; /* used by CTL */
STAILQ_ENTRY(ctl_backend_driver) links; /* used by CTL */
};
int ctl_backend_register(struct ctl_backend_driver *be);
int ctl_backend_deregister(struct ctl_backend_driver *be);
struct ctl_backend_driver *ctl_backend_find(char *backend_name);
/*
* To add a LUN, first call ctl_add_lun(). You will get the lun_config_status()
* callback when the LUN addition has either succeeded or failed.
*
* Once you get that callback, you can then call ctl_enable_lun() to enable
* the LUN.
*/
int ctl_add_lun(struct ctl_be_lun *be_lun);
int ctl_enable_lun(struct ctl_be_lun *be_lun);
/*
* To delete a LUN, first call ctl_disable_lun(), then
* ctl_invalidate_lun(). You will get the lun_shutdown() callback when all
* I/O to the LUN has completed and the LUN has been deleted.
*/
int ctl_disable_lun(struct ctl_be_lun *be_lun);
int ctl_invalidate_lun(struct ctl_be_lun *be_lun);
/*
* To start a LUN (transition from powered off to powered on state) call
* ctl_start_lun(). To stop a LUN (transition from powered on to powered
* off state) call ctl_stop_lun().
*/
int ctl_start_lun(struct ctl_be_lun *be_lun);
int ctl_stop_lun(struct ctl_be_lun *be_lun);
/*
* If a LUN is inoperable, call ctl_lun_inoperable(). Generally the LUN
* will become operable once again when the user issues the SCSI FORMAT UNIT
* command. (CTL will automatically clear the inoperable flag.) If we
* need to re-enable the LUN, we can call ctl_lun_operable() to enable it
* without a SCSI command.
*/
int ctl_lun_inoperable(struct ctl_be_lun *be_lun);
int ctl_lun_operable(struct ctl_be_lun *be_lun);
/*
* If a LUN is locked on or unlocked from a power/APS standpoint, call
* ctl_lun_power_lock() to update the current status in CTL's APS subpage.
* Set the lock flag to 1 to lock the LUN, set it to 0 to unlock the LUN.
*/
int ctl_lun_power_lock(struct ctl_be_lun *be_lun, struct ctl_nexus *nexus,
int lock);
/*
* To take a LUN offline, call ctl_lun_offline(). Generally the LUN will
* be online again once the user sends a SCSI START STOP UNIT command with
* the start and on/offline bits set. The backend can bring the LUN back
* online via the ctl_lun_online() function, if necessary.
*/
int ctl_lun_offline(struct ctl_be_lun *be_lun);
int ctl_lun_online(struct ctl_be_lun *be_lun);
#endif /* _KERNEL */
#endif /* _CTL_BACKEND_H_ */
/*
* vim: ts=8
*/
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