drivers/net/ethernet/chelsio/cxgb4/cudbg_zlib.c

   1 /*
   2  *  Copyright (C) 2018 Chelsio Communications.  All rights reserved.
   3  *
   4  *  This program is free software; you can redistribute it and/or modify it
   5  *  under the terms and conditions of the GNU General Public License,
   6  *  version 2, as published by the Free Software Foundation.
   7  *
   8  *  This program is distributed in the hope it will be useful, but WITHOUT
   9  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  *  more details.
  12  *
  13  *  The full GNU General Public License is included in this distribution in
  14  *  the file called "COPYING".
  15  *
  16  */
  17
  18 #include <linux/zlib.h>
  19
  20 #include "cxgb4.h"
  21 #include "cudbg_if.h"
  22 #include "cudbg_lib_common.h"
  23 #include "cudbg_zlib.h"
  24
  25 static int cudbg_get_compress_hdr(struct cudbg_buffer *pdbg_buff,
  26                                   struct cudbg_buffer *pin_buff)
  27 {
  28         if (pdbg_buff->offset + sizeof(struct cudbg_compress_hdr) >
  29             pdbg_buff->size)
  30                 return CUDBG_STATUS_NO_MEM;
  31
  32         pin_buff->data = (char *)pdbg_buff->data + pdbg_buff->offset;
  33         pin_buff->offset = 0;
  34         pin_buff->size = sizeof(struct cudbg_compress_hdr);
  35         pdbg_buff->offset += sizeof(struct cudbg_compress_hdr);
  36         return 0;
  37 }
  38
  39 int cudbg_compress_buff(struct cudbg_init *pdbg_init,
  40                         struct cudbg_buffer *pin_buff,
  41                         struct cudbg_buffer *pout_buff)
  42 {
  43         struct cudbg_buffer temp_buff = { 0 };
  44         struct z_stream_s compress_stream;
  45         struct cudbg_compress_hdr *c_hdr;
  46         int rc;
  47
  48         /* Write compression header to output buffer before compression */
  49         rc = cudbg_get_compress_hdr(pout_buff, &temp_buff);
  50         if (rc)
  51                 return rc;
  52
  53         c_hdr = (struct cudbg_compress_hdr *)temp_buff.data;
  54         c_hdr->compress_id = CUDBG_ZLIB_COMPRESS_ID;
  55
  56         memset(&compress_stream, 0, sizeof(struct z_stream_s));
  57         compress_stream.workspace = pdbg_init->workspace;
  58         rc = zlib_deflateInit2(&compress_stream, Z_DEFAULT_COMPRESSION,
  59                                Z_DEFLATED, CUDBG_ZLIB_WIN_BITS,
  60                                CUDBG_ZLIB_MEM_LVL, Z_DEFAULT_STRATEGY);
  61         if (rc != Z_OK)
  62                 return CUDBG_SYSTEM_ERROR;
  63
  64         compress_stream.next_in = pin_buff->data;
  65         compress_stream.avail_in = pin_buff->size;
  66         compress_stream.next_out = pout_buff->data + pout_buff->offset;
  67         compress_stream.avail_out = pout_buff->size - pout_buff->offset;
  68
  69         rc = zlib_deflate(&compress_stream, Z_FINISH);
  70         if (rc != Z_STREAM_END)
  71                 return CUDBG_SYSTEM_ERROR;
  72
  73         rc = zlib_deflateEnd(&compress_stream);
  74         if (rc != Z_OK)
  75                 return CUDBG_SYSTEM_ERROR;
  76
  77         c_hdr->compress_size = compress_stream.total_out;
  78         c_hdr->decompress_size = pin_buff->size;
  79         pout_buff->offset += compress_stream.total_out;
  80
  81         return 0;
  82 }