module/zfs/gzip.c

   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 2007 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27
  28
  29 #include <sys/debug.h>
  30 #include <sys/types.h>
  31 #include <sys/strings.h>
  32 #include "qat.h"
  33
  34 #ifdef _KERNEL
  35
  36 #include <sys/zmod.h>
  37 typedef size_t zlen_t;
  38 #define compress_func   z_compress_level
  39 #define uncompress_func z_uncompress
  40
  41 #else /* _KERNEL */
  42
  43 #include <zlib.h>
  44 typedef uLongf zlen_t;
  45 #define compress_func   compress2
  46 #define uncompress_func uncompress
  47
  48 #endif
  49
  50 size_t
  51 gzip_compress(void *s_start, void *d_start, size_t s_len, size_t d_len, int n)
  52 {
  53         int ret;
  54         zlen_t dstlen = d_len;
  55
  56         ASSERT(d_len <= s_len);
  57
  58         /* check if hardware accelerator can be used */
  59         if (qat_dc_use_accel(s_len)) {
  60                 ret = qat_compress(QAT_COMPRESS, s_start, s_len, d_start,
  61                     d_len, &dstlen);
  62                 if (ret == CPA_STATUS_SUCCESS) {
  63                         return ((size_t)dstlen);
  64                 } else if (ret == CPA_STATUS_INCOMPRESSIBLE) {
  65                         if (d_len != s_len)
  66                                 return (s_len);
  67
  68                         bcopy(s_start, d_start, s_len);
  69                         return (s_len);
  70                 }
  71                 /* if hardware compression fails, do it again with software */
  72         }
  73
  74         if (compress_func(d_start, &dstlen, s_start, s_len, n) != Z_OK) {
  75                 if (d_len != s_len)
  76                         return (s_len);
  77
  78                 bcopy(s_start, d_start, s_len);
  79                 return (s_len);
  80         }
  81
  82         return ((size_t)dstlen);
  83 }
  84
  85 /*ARGSUSED*/
  86 int
  87 gzip_decompress(void *s_start, void *d_start, size_t s_len, size_t d_len, int n)
  88 {
  89         zlen_t dstlen = d_len;
  90
  91         ASSERT(d_len >= s_len);
  92
  93         /* check if hardware accelerator can be used */
  94         if (qat_dc_use_accel(d_len)) {
  95                 if (qat_compress(QAT_DECOMPRESS, s_start, s_len,
  96                     d_start, d_len, &dstlen) == CPA_STATUS_SUCCESS)
  97                         return (0);
  98                 /* if hardware de-compress fail, do it again with software */
  99         }
 100
 101         if (uncompress_func(d_start, &dstlen, s_start, s_len) != Z_OK)
 102                 return (-1);
 103
 104         return (0);
 105 }