315 lines
9.0 KiB
C
315 lines
9.0 KiB
C
/* $NetBSD: dmovervar.h,v 1.10 2005/12/24 20:27:29 perry Exp $ */
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/*
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* Copyright (c) 2002, 2003 Wasabi Systems, Inc.
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* All rights reserved.
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*
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* Written by Jason R. Thorpe for Wasabi Systems, Inc.
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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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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed for the NetBSD Project by
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* Wasabi Systems, Inc.
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* 4. The name of Wasabi Systems, Inc. may not be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _DMOVER_DMOVERVAR_H_
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#define _DMOVER_DMOVERVAR_H_
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#include <sys/lock.h>
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#include <sys/queue.h>
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/*
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* Types of buffers the dmover-api can handle.
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*/
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typedef enum {
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DMOVER_BUF_NONE = 0,
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DMOVER_BUF_LINEAR = 1,
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DMOVER_BUF_UIO = 2
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} dmover_buffer_type;
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typedef struct {
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void *l_addr;
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size_t l_len;
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} dmover_buf_linear;
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typedef union {
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dmover_buf_linear dmbuf_linear;
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struct uio *dmbuf_uio;
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} dmover_buffer;
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/*
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* dmover_algdesc:
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*
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* This structure describes an dmover algorithm.
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*
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* All members of this structure are public.
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*/
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struct dmover_algdesc {
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const char *dad_name; /* algorithm name */
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void *dad_data; /* opaque algorithm description */
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int dad_ninputs; /* number of inputs */
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};
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/*
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* dmover_assignment:
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*
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* This structure contains the information necessary to assign
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* a request to a back-end.
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*
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* All members of this structure are public.
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*/
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struct dmover_assignment {
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struct dmover_backend *das_backend;
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const struct dmover_algdesc *das_algdesc;
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};
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/*
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* dmover_session:
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*
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* State for a dmover session.
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*/
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struct dmover_session {
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/*
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* PUBLIC MEMBERS
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*/
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void *dses_cookie; /* for client */
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int dses_ninputs; /* number of inputs for function */
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/*
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* PRIVATE MEMBERS
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*/
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LIST_ENTRY(dmover_session) __dses_list;
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/*
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* XXX Assignment is static when a session is
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* XXX created, for now.
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*/
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struct dmover_assignment __dses_assignment;
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/* List of active requests on this session. */
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TAILQ_HEAD(, dmover_request) __dses_pendreqs;
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int __dses_npendreqs;
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};
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#define dmover_session_insque(dses, dreq) \
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do { \
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TAILQ_INSERT_TAIL(&(dses)->__dses_pendreqs, (dreq), dreq_sesq); \
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(dses)->__dses_npendreqs++; \
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} while (/*CONSTCOND*/0)
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#define dmover_session_remque(dses, dreq) \
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do { \
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TAILQ_REMOVE(&(dses)->__dses_pendreqs, (dreq), dreq_sesq); \
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(dses)->__dses_npendreqs--; \
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} while (/*CONSTCOND*/0)
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/*
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* dmover_request:
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*
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* A data dmover request.
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*/
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struct dmover_request {
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/*
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* PUBLIC MEMBERS
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*/
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/* Links on session and back-end queues. */
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TAILQ_ENTRY(dmover_request) dreq_sesq;
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TAILQ_ENTRY(dmover_request) dreq_dmbq;
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/* Pointer to our session. */
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struct dmover_session *dreq_session;
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/* Our current back-end assignment. */
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struct dmover_assignment *dreq_assignment;
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/* Function to call when processing is complete. */
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void (*dreq_callback)(struct dmover_request *);
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void *dreq_cookie; /* for client */
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volatile int dreq_flags; /* flags; see below */
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int dreq_error; /* valid if DMOVER_REQ_ERROR is set */
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/*
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* General purpose immediate value. Can be used as an
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* input, output, or both, depending on the function.
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*/
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uint8_t dreq_immediate[8];
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/* Output buffer. */
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dmover_buffer_type dreq_outbuf_type;
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dmover_buffer dreq_outbuf;
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/* Input buffer. */
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dmover_buffer_type dreq_inbuf_type;
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dmover_buffer *dreq_inbuf;
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};
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/* dreq_flags */
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#define DMOVER_REQ_DONE 0x0001 /* request is completed */
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#define DMOVER_REQ_ERROR 0x0002 /* error occurred */
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#define DMOVER_REQ_RUNNING 0x0004 /* request is being executed */
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#define DMOVER_REQ_WAIT 0x0008 /* wait for completion */
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#define __DMOVER_REQ_INBUF_FREE 0x01000000 /* need to free input buffer */
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#define __DMOVER_REQ_FLAGS_PRESERVE \
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(DMOVER_REQ_WAIT | __DMOVER_REQ_INBUF_FREE)
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/*
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* dmover_backend:
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*
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* Glue between the dmover-api middle layer and the dmover
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* backends.
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*
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* All members of this structure are public.
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*/
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struct dmover_backend {
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TAILQ_ENTRY(dmover_backend) dmb_list;
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const char *dmb_name; /* name of back-end */
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u_int dmb_speed; /* est. KB/s throughput */
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void *dmb_cookie; /* for back-end */
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/* List of algorithms this back-ends supports. */
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const struct dmover_algdesc *dmb_algdescs;
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int dmb_nalgdescs;
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/* Back-end functions. */
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void (*dmb_process)(struct dmover_backend *);
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/* List of sessions currently on this back-end. */
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LIST_HEAD(, dmover_session) dmb_sessions;
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int dmb_nsessions; /* current number of sessions */
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/* List of active requests on this back-end. */
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TAILQ_HEAD(, dmover_request) dmb_pendreqs;
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int dmb_npendreqs;
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};
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#define dmover_backend_insque(dmb, dreq) \
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do { \
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TAILQ_INSERT_TAIL(&(dmb)->dmb_pendreqs, (dreq), dreq_dmbq); \
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(dmb)->dmb_npendreqs++; \
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} while (/*CONSTCOND*/0)
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#define dmover_backend_remque(dmb, dreq) \
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do { \
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TAILQ_REMOVE(&(dmb)->dmb_pendreqs, (dreq), dreq_dmbq); \
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(dmb)->dmb_npendreqs--; \
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} while (/*CONSTCOND*/0)
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/*
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* Well-known data mover functions. Using these for the function name
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* saves space.
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*/
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extern const char dmover_funcname_zero[];
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#define DMOVER_FUNC_ZERO dmover_funcname_zero
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extern const char dmover_funcname_fill8[];
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#define DMOVER_FUNC_FILL8 dmover_funcname_fill8
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extern const char dmover_funcname_copy[];
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#define DMOVER_FUNC_COPY dmover_funcname_copy
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extern const char dmover_funcname_iscsi_crc32c[];
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#define DMOVER_FUNC_ISCSI_CRC32C dmover_funcname_iscsi_crc32c
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extern const char dmover_funcname_xor2[];
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#define DMOVER_FUNC_XOR2 dmover_funcname_xor2
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extern const char dmover_funcname_xor3[];
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#define DMOVER_FUNC_XOR3 dmover_funcname_xor3
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extern const char dmover_funcname_xor4[];
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#define DMOVER_FUNC_XOR4 dmover_funcname_xor4
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extern const char dmover_funcname_xor5[];
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#define DMOVER_FUNC_XOR5 dmover_funcname_xor5
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extern const char dmover_funcname_xor6[];
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#define DMOVER_FUNC_XOR6 dmover_funcname_xor6
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extern const char dmover_funcname_xor7[];
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#define DMOVER_FUNC_XOR7 dmover_funcname_xor7
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extern const char dmover_funcname_xor8[];
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#define DMOVER_FUNC_XOR8 dmover_funcname_xor8
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extern const char dmover_funcname_xor9[];
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#define DMOVER_FUNC_XOR9 dmover_funcname_xor9
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extern const char dmover_funcname_xor10[];
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#define DMOVER_FUNC_XOR10 dmover_funcname_xor10
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extern const char dmover_funcname_xor11[];
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#define DMOVER_FUNC_XOR11 dmover_funcname_xor11
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extern const char dmover_funcname_xor12[];
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#define DMOVER_FUNC_XOR12 dmover_funcname_xor12
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extern const char dmover_funcname_xor13[];
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#define DMOVER_FUNC_XOR13 dmover_funcname_xor13
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extern const char dmover_funcname_xor14[];
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#define DMOVER_FUNC_XOR14 dmover_funcname_xor14
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extern const char dmover_funcname_xor15[];
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#define DMOVER_FUNC_XOR15 dmover_funcname_xor15
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extern const char dmover_funcname_xor16[];
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#define DMOVER_FUNC_XOR16 dmover_funcname_xor16
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/* Back-end management functions. */
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void dmover_backend_register(struct dmover_backend *);
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void dmover_backend_unregister(struct dmover_backend *);
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int dmover_backend_alloc(struct dmover_session *, const char *);
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void dmover_backend_release(struct dmover_session *);
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/* Session management functions. */
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void dmover_session_initialize(void);
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int dmover_session_create(const char *, struct dmover_session **);
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void dmover_session_destroy(struct dmover_session *);
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/* Request management functions. */
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void dmover_request_initialize(void);
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struct dmover_request *dmover_request_alloc(struct dmover_session *,
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dmover_buffer *);
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void dmover_request_free(struct dmover_request *);
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/* Processing engine functions. */
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void dmover_process_initialize(void);
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void dmover_process(struct dmover_request *);
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void dmover_done(struct dmover_request *);
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/* Utility functions. */
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const struct dmover_algdesc *
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dmover_algdesc_lookup(const struct dmover_algdesc *, int,
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const char *);
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#endif /* _DMOVER_DMOVERVAR_H_ */
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