kernel/fs/sockfs/sodirect.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T     */
  28 /*        All Rights Reserved   */
  29
  30 /*
  31  * University Copyright- Copyright (c) 1982, 1986, 1988
  32  * The Regents of the University of California
  33  * All Rights Reserved
  34  *
  35  * University Acknowledgment- Portions of this document are derived from
  36  * software developed by the University of California, Berkeley, and its
  37  * contributors.
  38  */
  39
  40 #ifndef _SOCKFS_SODIRECT_H
  41 #define _SOCKFS_SODIRECT_H
  42
  43 /*
  44  * Sodirect; used to support asynchronous DMA hardware
  45  * (e.g. Intel's I/OAT).
  46  */
  47
  48 #ifdef  __cplusplus
  49 extern "C" {
  50 #endif
  51
  52 typedef struct sodirect_s {
  53         boolean_t       sod_enabled;    /* sodirect_t enabled */
  54         mblk_t          *sod_uioafh;    /* To be freed list head, or NULL */
  55         mblk_t          *sod_uioaft;    /* To be freed list tail */
  56         uioa_t          sod_uioa;       /* Pending uio_t for uioa_t use */
  57 } sodirect_t;
  58
  59 /*
  60  * Usefull macros:
  61  */
  62 #define SOD_DISABLE(sodp) {             \
  63         (sodp)->sod_enabled = B_FALSE;  \
  64 }
  65
  66 #define SOD_SOTOSODP(so) ((sonode_t *)so)->so_direct
  67
  68 #define SOD_UIOAFINI(sodp) {                                            \
  69         if ((sodp)->sod_uioa.uioa_state & UIOA_ENABLED) {               \
  70                 (sodp)->sod_uioa.uioa_state &= UIOA_CLR;                \
  71                 (sodp)->sod_uioa.uioa_state |= UIOA_FINI;               \
  72         }                                                               \
  73 }
  74
  75 struct sonode;
  76 struct sodirect_s;
  77
  78 extern uio_t    *sod_rcv_init(struct sonode *, int, struct uio **);
  79 extern int      sod_rcv_done(struct sonode *, struct uio *, struct uio *);
  80
  81 extern void     sod_uioa_mblk_init(struct sodirect_s *, mblk_t *, size_t);
  82 extern void     sod_uioa_so_init(struct sonode *, struct sodirect_s *,
  83     struct uio *);
  84 extern ssize_t  sod_uioa_mblk(struct sonode *, mblk_t *);
  85 extern void     sod_uioa_mblk_done(struct sodirect_s *, mblk_t *);
  86
  87 extern int      sod_init(void);
  88 extern void     sod_sock_init(struct sonode *);
  89 extern void     sod_sock_fini(struct sonode *);
  90
  91 #ifdef  __cplusplus
  92 }
  93 #endif
  94
  95 #endif  /* _SOCKFS_SODIRECT_H */