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| Current File : //sys/cam/ctl/ctl_frontend.h |
/*-
* 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_frontend.h#2 $
* $FreeBSD: release/9.1.0/sys/cam/ctl/ctl_frontend.h 229997 2012-01-12 00:34:33Z ken $
*/
/*
* CAM Target Layer front end registration hooks
*
* Author: Ken Merry <ken@FreeBSD.org>
*/
#ifndef _CTL_FRONTEND_H_
#define _CTL_FRONTEND_H_
typedef enum {
CTL_PORT_STATUS_NONE = 0x00,
CTL_PORT_STATUS_ONLINE = 0x01,
CTL_PORT_STATUS_TARG_ONLINE = 0x02,
CTL_PORT_STATUS_LUN_ONLINE = 0x04
} ctl_port_status;
typedef void (*port_func_t)(void *onoff_arg);
typedef int (*targ_func_t)(void *arg, struct ctl_id targ_id);
typedef int (*lun_func_t)(void *arg, struct ctl_id targ_id, int lun_id);
/*
* The ctl_frontend structure is the registration mechanism between a FETD
* (Front End Target Driver) and the CTL layer. Here is a description of
* the fields:
*
* port_type: This field tells CTL what kind of front end it is
* dealing with. This field serves two purposes.
* The first is to let CTL know whether the frontend
* in question is inside the main CTL module (i.e.
* the ioctl front end), and therefore its module
* reference count shouldn't be incremented. The
* CTL ioctl front end should continue to use the
* CTL_PORT_IOCTL argument as long as it is part of
* the main CTL module. The second is to let CTL
* know what kind of front end it is dealing with, so
* it can return the proper inquiry data for that
* particular port.
*
* num_requested_ctl_io: This is the number of ctl_io structures that the
* front end needs for its pool. This should
* generally be the maximum number of outstanding
* transactions that the FETD can handle. The CTL
* layer will add a few to this to account for
* ctl_io buffers queued for pending sense data.
* (Pending sense only gets queued if the FETD
* doesn't support autosense. e.g. non-packetized
* parallel SCSI doesn't support autosense.)
*
* port_name: A string describing the FETD. e.g. "LSI 1030T U320"
* or whatever you want to use to describe the driver.
*
*
* physical_port: This is the physical port number of this
* particular port within the driver/hardware. This
* number is hardware/driver specific.
* virtual_port: This is the virtual port number of this
* particular port. This is for things like NP-IV.
*
* port_online(): This function is called, with onoff_arg as its
* argument, by the CTL layer when it wants the FETD
* to start responding to selections on the specified
* target ID. (targ_target)
*
* port_offline(): This function is called, with onoff_arg as its
* argument, by the CTL layer when it wants the FETD
* to stop responding to selection on the specified
* target ID. (targ_target)
*
* onoff_arg: This is supplied as an argument to port_online()
* and port_offline(). This is specified by the
* FETD.
*
* targ_enable(): This function is called, with targ_lun_arg and a
* target ID as its arguments, by CTL when it wants
* the FETD to enable a particular target. targ_enable()
* will always be called for a particular target ID
* before any LUN is enabled for that target. If the
* FETD does not support enabling targets, but rather
* LUNs, it should ignore this call and return 0. If
* the FETD does support enabling targets, it should
* return 0 for success and non-zero if it cannot
* enable the given target.
*
* TODO: Add the ability to specify a WWID here.
*
* targ_disable(): This function is called, with targ_lun_arg and a
* target ID as its arguments, by CTL when it wants
* the FETD to disable a particular target.
* targ_disable() will always be called for a
* particular target ID after all LUNs are disabled
* on that particular target. If the FETD does not
* support enabling targets, it should ignore this
* call and return 0. If the FETD does support
* enabling targets, it should return 0 for success,
* and non-zero if it cannot disable the given target.
*
* lun_enable(): This function is called, with targ_lun_arg, a target
* ID and a LUN ID as its arguments, by CTL when it
* wants the FETD to enable a particular LUN. If the
* FETD doesn't really know about LUNs, it should
* just ignore this call and return 0. If the FETD
* cannot enable the requested LUN for some reason, the
* FETD should return non-zero status.
*
* lun_disable(): This function is called, with targ_lun_arg, a target
* ID and LUN ID as its arguments, by CTL when it
* wants the FETD to disable a particular LUN. If the
* FETD doesn't really know about LUNs, it should just
* ignore this call and return 0. If the FETD cannot
* disable the requested LUN for some reason, the
* FETD should return non-zero status.
*
* targ_lun_arg: This is supplied as an argument to the targ/lun
* enable/disable() functions. This is specified by
* the FETD.
*
* fe_datamove(): This function is called one or more times per I/O
* by the CTL layer to tell the FETD to initiate a
* DMA to or from the data buffer(s) specified by
* the passed-in ctl_io structure.
*
* fe_done(): This function is called by the CTL layer when a
* particular SCSI I/O or task management command has
* completed. For SCSI I/O requests (CTL_IO_SCSI),
* sense data is always supplied if the status is
* CTL_SCSI_ERROR and the SCSI status byte is
* SCSI_STATUS_CHECK_COND. If the FETD doesn't
* support autosense, the sense should be queued
* back to the CTL layer via ctl_queue_sense().
*
* fe_dump(): This function, if it exists, is called by CTL
* to request a dump of any debugging information or
* state to the console.
*
* max_targets: The maximum number of targets that we can create
* per-port.
*
* max_target_id: The highest target ID that we can use.
*
* targ_port: The CTL layer assigns a "port number" to every
* FETD. This port number should be passed back in
* in the header of every ctl_io that is queued to
* the CTL layer. This enables us to determine
* which bus the command came in on.
*
* ctl_pool_ref: Memory pool reference used by the FETD in calls to
* ctl_alloc_io().
*
* max_initiators: Maximum number of initiators that the FETD is
* allowed to have. Initiators should be numbered
* from 0 to max_initiators - 1. This value will
* typically be 16, and thus not a problem for
* parallel SCSI. This may present issues for Fibre
* Channel.
*
* wwnn World Wide Node Name to be used by the FETD.
* Note that this is set *after* registration. It
* will be set prior to the online function getting
* called.
*
* wwpn World Wide Port Name to be used by the FETD.
* Note that this is set *after* registration. It
* will be set prior to the online function getting
* called.
*
* status: Used by CTL to keep track of per-FETD state.
*
* links: Linked list pointers, used by CTL. The FETD
* shouldn't touch this field.
*/
struct ctl_frontend {
ctl_port_type port_type; /* passed to CTL */
int num_requested_ctl_io; /* passed to CTL */
char *port_name; /* passed to CTL */
int physical_port; /* passed to CTL */
int virtual_port; /* passed to CTL */
port_func_t port_online; /* passed to CTL */
port_func_t port_offline; /* passed to CTL */
void *onoff_arg; /* passed to CTL */
targ_func_t targ_enable; /* passed to CTL */
targ_func_t targ_disable; /* passed to CTL */
lun_func_t lun_enable; /* passed to CTL */
lun_func_t lun_disable; /* passed to CTL */
void *targ_lun_arg; /* passed to CTL */
void (*fe_datamove)(union ctl_io *io); /* passed to CTL */
void (*fe_done)(union ctl_io *io); /* passed to CTL */
void (*fe_dump)(void); /* passed to CTL */
int max_targets; /* passed to CTL */
int max_target_id; /* passed to CTL */
int32_t targ_port; /* passed back to FETD */
void *ctl_pool_ref; /* passed back to FETD */
uint32_t max_initiators; /* passed back to FETD */
uint64_t wwnn; /* set by CTL before online */
uint64_t wwpn; /* set by CTL before online */
ctl_port_status status; /* used by CTL */
STAILQ_ENTRY(ctl_frontend) links; /* used by CTL */
};
/*
* This may block until resources are allocated. Called at FETD module load
* time. Returns 0 for success, non-zero for failure.
*/
int ctl_frontend_register(struct ctl_frontend *fe, int master_SC);
/*
* Called at FETD module unload time.
* Returns 0 for success, non-zero for failure.
*/
int ctl_frontend_deregister(struct ctl_frontend *fe);
/*
* Called to set the WWNN and WWPN for a particular frontend.
*/
void ctl_frontend_set_wwns(struct ctl_frontend *fe, int wwnn_valid,
uint64_t wwnn, int wwpn_valid, uint64_t wwpn);
/*
* Called to bring a particular frontend online.
*/
void ctl_frontend_online(struct ctl_frontend *fe);
/*
* Called to take a particular frontend offline.
*/
void ctl_frontend_offline(struct ctl_frontend *fe);
/*
* This routine queues I/O and task management requests from the FETD to the
* CTL layer. Returns immediately. Returns 0 for success, non-zero for
* failure.
*/
int ctl_queue(union ctl_io *io);
/*
* This routine is used if the front end interface doesn't support
* autosense (e.g. non-packetized parallel SCSI). This will queue the
* scsiio structure back to a per-lun pending sense queue. This MUST be
* called BEFORE any request sense can get queued to the CTL layer -- I
* need it in the queue in order to service the request. The scsiio
* structure passed in here will be freed by the CTL layer when sense is
* retrieved by the initiator. Returns 0 for success, non-zero for failure.
*/
int ctl_queue_sense(union ctl_io *io);
/*
* This routine adds an initiator to CTL's port database. The WWPN should
* be the FC WWPN, if available. The targ_port field should be the same as
* the targ_port passed back from CTL in the ctl_frontend structure above.
* The iid field should be the same as the iid passed in the nexus of each
* ctl_io from this initiator.
*/
int ctl_add_initiator(uint64_t wwpn, int32_t targ_port, uint32_t iid);
/*
* This routine will remove an initiator from CTL's port database. The
* targ_port field should be the same as the targ_port passed back in the
* ctl_frontend structure above. The iid field should be the same as the
* iid passed in the nexus of each ctl_io from this initiator.
*/
int
ctl_remove_initiator(int32_t targ_port, uint32_t iid);
#endif /* _CTL_FRONTEND_H_ */