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dfbb6f2e59
Sponsored by: Chelsio Communications Differential Revision: https://reviews.freebsd.org/D42931
346 lines
13 KiB
C
346 lines
13 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2003 Silicon Graphics International Corp.
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* Copyright (c) 2014-2017 Alexander Motin <mav@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*
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* $Id: //depot/users/kenm/FreeBSD-test2/sys/cam/ctl/ctl_frontend.h#2 $
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*/
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/*
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* CAM Target Layer front end registration hooks
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*
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* Author: Ken Merry <ken@FreeBSD.org>
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*/
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#ifndef _CTL_FRONTEND_H_
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#define _CTL_FRONTEND_H_
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#include <cam/ctl/ctl_ioctl.h>
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#include <sys/nv.h>
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typedef enum {
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CTL_PORT_STATUS_NONE = 0x00,
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CTL_PORT_STATUS_ONLINE = 0x01,
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CTL_PORT_STATUS_HA_SHARED = 0x02
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} ctl_port_status;
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typedef int (*fe_init_t)(void);
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typedef int (*fe_shutdown_t)(void);
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typedef void (*port_func_t)(void *onoff_arg);
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typedef int (*port_info_func_t)(void *onoff_arg, struct sbuf *sb);
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typedef int (*lun_func_t)(void *arg, int lun_id);
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typedef int (*fe_ioctl_t)(struct cdev *dev, u_long cmd, caddr_t addr, int flag,
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struct thread *td);
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#define CTL_FRONTEND_DECLARE(name, driver) \
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static int name ## _modevent(module_t mod, int type, void *data) \
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{ \
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switch (type) { \
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case MOD_LOAD: \
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return (ctl_frontend_register( \
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(struct ctl_frontend *)data)); \
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break; \
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case MOD_UNLOAD: \
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return (ctl_frontend_deregister( \
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(struct ctl_frontend *)data)); \
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break; \
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default: \
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return EOPNOTSUPP; \
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} \
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return 0; \
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} \
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static moduledata_t name ## _mod = { \
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#name, \
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name ## _modevent, \
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(void *)&driver \
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}; \
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DECLARE_MODULE(name, name ## _mod, SI_SUB_CONFIGURE, SI_ORDER_FOURTH); \
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MODULE_DEPEND(name, ctl, 1, 1, 1); \
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MODULE_DEPEND(name, cam, 1, 1, 1)
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struct ctl_wwpn_iid {
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int in_use;
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time_t last_use;
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uint64_t wwpn;
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char *name;
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};
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/*
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* The ctl_frontend structure is the registration mechanism between a FETD
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* (Front End Target Driver) and the CTL layer. Here is a description of
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* the fields:
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*
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* port_type: This field tells CTL what kind of front end it is
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* dealing with. This field serves two purposes.
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* The first is to let CTL know whether the frontend
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* in question is inside the main CTL module (i.e.
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* the ioctl front end), and therefore its module
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* reference count shouldn't be incremented. The
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* CTL ioctl front end should continue to use the
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* CTL_PORT_IOCTL argument as long as it is part of
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* the main CTL module. The second is to let CTL
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* know what kind of front end it is dealing with, so
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* it can return the proper inquiry data for that
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* particular port.
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*
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* num_requested_ctl_io: This is the number of ctl_io structures that the
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* front end needs for its pool. This should
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* generally be the maximum number of outstanding
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* transactions that the FETD can handle. The CTL
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* layer will add a few to this to account for
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* ctl_io buffers queued for pending sense data.
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* (Pending sense only gets queued if the FETD
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* doesn't support autosense. e.g. non-packetized
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* parallel SCSI doesn't support autosense.)
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*
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* port_name: A string describing the FETD. e.g. "LSI 1030T U320"
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* or whatever you want to use to describe the driver.
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*
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* physical_port: This is the physical port number of this
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* particular port within the driver/hardware. This
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* number is hardware/driver specific.
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* virtual_port: This is the virtual port number of this
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* particular port. This is for things like NP-IV.
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*
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* port_online(): This function is called, with onoff_arg as its
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* argument, by the CTL layer when it wants the FETD
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* to start responding to selections on the specified
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* target ID.
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*
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* port_offline(): This function is called, with onoff_arg as its
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* argument, by the CTL layer when it wants the FETD
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* to stop responding to selection on the specified
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* target ID.
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*
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* onoff_arg: This is supplied as an argument to port_online()
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* and port_offline(). This is specified by the
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* FETD.
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*
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* lun_enable(): This function is called, with targ_lun_arg, a target
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* ID and a LUN ID as its arguments, by CTL when it
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* wants the FETD to enable a particular LUN. If the
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* FETD doesn't really know about LUNs, it should
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* just ignore this call and return 0. If the FETD
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* cannot enable the requested LUN for some reason, the
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* FETD should return non-zero status.
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*
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* lun_disable(): This function is called, with targ_lun_arg, a target
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* ID and LUN ID as its arguments, by CTL when it
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* wants the FETD to disable a particular LUN. If the
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* FETD doesn't really know about LUNs, it should just
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* ignore this call and return 0. If the FETD cannot
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* disable the requested LUN for some reason, the
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* FETD should return non-zero status.
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*
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* targ_lun_arg: This is supplied as an argument to the targ/lun
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* enable/disable() functions. This is specified by
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* the FETD.
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*
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* fe_datamove(): This function is called one or more times per I/O
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* by the CTL layer to tell the FETD to initiate a
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* DMA to or from the data buffer(s) specified by
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* the passed-in ctl_io structure.
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*
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* fe_done(): This function is called by the CTL layer when a
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* particular SCSI I/O or task management command has
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* completed. For SCSI I/O requests (CTL_IO_SCSI),
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* sense data is always supplied if the status is
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* CTL_SCSI_ERROR and the SCSI status byte is
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* SCSI_STATUS_CHECK_COND. If the FETD doesn't
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* support autosense, the sense should be queued
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* back to the CTL layer via ctl_queue_sense().
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*
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* fe_dump(): This function, if it exists, is called by CTL
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* to request a dump of any debugging information or
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* state to the console.
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*
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* targ_port: The CTL layer assigns a "port number" to every
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* FETD. This port number should be passed back in
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* in the header of every ctl_io that is queued to
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* the CTL layer. This enables us to determine
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* which bus the command came in on.
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*
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* ctl_pool_ref: Memory pool reference used by the FETD in calls to
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* ctl_alloc_io().
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*
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* max_initiators: Maximum number of initiators that the FETD is
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* allowed to have. Initiators should be numbered
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* from 0 to max_initiators - 1. This value will
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* typically be 16, and thus not a problem for
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* parallel SCSI. This may present issues for Fibre
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* Channel.
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*
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* wwnn World Wide Node Name to be used by the FETD.
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* Note that this is set *after* registration. It
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* will be set prior to the online function getting
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* called.
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*
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* wwpn World Wide Port Name to be used by the FETD.
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* Note that this is set *after* registration. It
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* will be set prior to the online function getting
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* called.
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*
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* status: Used by CTL to keep track of per-FETD state.
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*
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* links: Linked list pointers, used by CTL. The FETD
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* shouldn't touch this field.
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*/
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struct ctl_port {
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struct ctl_softc *ctl_softc;
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struct ctl_frontend *frontend; /* passed to CTL */
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ctl_port_type port_type; /* passed to CTL */
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int num_requested_ctl_io; /* passed to CTL */
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char *port_name; /* passed to CTL */
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int physical_port; /* passed to CTL */
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int virtual_port; /* passed to CTL */
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port_func_t port_online; /* passed to CTL */
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port_func_t port_offline; /* passed to CTL */
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port_info_func_t port_info; /* passed to CTL */
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void *onoff_arg; /* passed to CTL */
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lun_func_t lun_enable; /* passed to CTL */
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lun_func_t lun_disable; /* passed to CTL */
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int lun_map_size; /* passed to CTL */
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uint32_t *lun_map; /* passed to CTL */
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void *targ_lun_arg; /* passed to CTL */
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void (*fe_datamove)(union ctl_io *io); /* passed to CTL */
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void (*fe_done)(union ctl_io *io); /* passed to CTL */
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int32_t targ_port; /* passed back to FETD */
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void *ctl_pool_ref; /* passed back to FETD */
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uint32_t max_initiators; /* passed back to FETD */
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struct ctl_wwpn_iid *wwpn_iid; /* used by CTL */
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uint64_t wwnn; /* set by CTL before online */
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uint64_t wwpn; /* set by CTL before online */
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ctl_port_status status; /* used by CTL */
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nvlist_t *options; /* passed to CTL */
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struct ctl_devid *port_devid; /* passed to CTL */
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struct ctl_devid *target_devid; /* passed to CTL */
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struct ctl_devid *init_devid; /* passed to CTL */
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struct ctl_io_stats stats; /* used by CTL */
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struct mtx port_lock; /* used by CTL */
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STAILQ_ENTRY(ctl_port) fe_links; /* used by CTL */
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STAILQ_ENTRY(ctl_port) links; /* used by CTL */
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};
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struct ctl_frontend {
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char name[CTL_DRIVER_NAME_LEN]; /* passed to CTL */
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fe_init_t init; /* passed to CTL */
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fe_ioctl_t ioctl; /* passed to CTL */
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void (*fe_dump)(void); /* passed to CTL */
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fe_shutdown_t shutdown; /* passed to CTL */
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STAILQ_HEAD(, ctl_port) port_list; /* used by CTL */
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STAILQ_ENTRY(ctl_frontend) links; /* used by CTL */
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};
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/*
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* This may block until resources are allocated. Called at FETD module load
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* time. Returns 0 for success, non-zero for failure.
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*/
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int ctl_frontend_register(struct ctl_frontend *fe);
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/*
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* Called at FETD module unload time.
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* Returns 0 for success, non-zero for failure.
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*/
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int ctl_frontend_deregister(struct ctl_frontend *fe);
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/*
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* Find the frontend by its name. Returns NULL if not found.
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*/
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struct ctl_frontend * ctl_frontend_find(char *frontend_name);
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/*
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* This may block until resources are allocated. Called at FETD module load
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* time. Returns 0 for success, non-zero for failure.
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*/
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int ctl_port_register(struct ctl_port *port);
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/*
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* Called at FETD module unload time.
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* Returns 0 for success, non-zero for failure.
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*/
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int ctl_port_deregister(struct ctl_port *port);
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/*
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* Called to set the WWNN and WWPN for a particular frontend.
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*/
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void ctl_port_set_wwns(struct ctl_port *port, int wwnn_valid,
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uint64_t wwnn, int wwpn_valid, uint64_t wwpn);
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/*
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* Called to bring a particular frontend online.
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*/
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void ctl_port_online(struct ctl_port *fe);
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/*
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* Called to take a particular frontend offline.
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*/
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void ctl_port_offline(struct ctl_port *fe);
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/*
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* This routine queues I/O and task management requests from the FETD to the
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* CTL layer. Returns immediately. Returns 0 for success, non-zero for
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* failure.
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*/
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int ctl_queue(union ctl_io *io);
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/*
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* This routine starts execution of I/O and task management requests from
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* the FETD to the CTL layer. May sleep. Returns 0 for success, non-zero
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* for failure.
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*/
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int ctl_run(union ctl_io *io);
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/*
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* This routine is used if the front end interface doesn't support
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* autosense (e.g. non-packetized parallel SCSI). This will queue the
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* scsiio structure back to a per-lun pending sense queue. This MUST be
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* called BEFORE any request sense can get queued to the CTL layer -- I
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* need it in the queue in order to service the request. The scsiio
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* structure passed in here will be freed by the CTL layer when sense is
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* retrieved by the initiator. Returns 0 for success, non-zero for failure.
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*/
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int ctl_queue_sense(union ctl_io *io);
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/*
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* This routine adds an initiator to CTL's port database.
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* The iid field should be the same as the iid passed in the nexus of each
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* ctl_io from this initiator.
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* The WWPN should be the FC WWPN, if available.
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*/
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int ctl_add_initiator(struct ctl_port *port, int iid, uint64_t wwpn, char *name);
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/*
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* This routine will remove an initiator from CTL's port database.
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* The iid field should be the same as the iid passed in the nexus of each
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* ctl_io from this initiator.
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*/
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int ctl_remove_initiator(struct ctl_port *port, int iid);
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#endif /* _CTL_FRONTEND_H_ */
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