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/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2018 Intel Corporation
*
* Author: Qiaowei Ren <qiaowei.ren@intel.com>
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#include "QatAccel.h"
/* Estimate data expansion after decompression */
static const unsigned int expansion_ratio[] = {5, 20, 50, 100, 200};
QatAccel::~QatAccel() {
if (NULL != session.internal) {
qzTeardownSession(&session);
qzClose(&session);
}
}
bool QatAccel::init(const std::string &alg) {
QzSessionParams_T params = {(QzHuffmanHdr_T)0,};
int rc;
rc = qzGetDefaults(¶ms);
if (rc != QZ_OK)
return false;
params.direction = QZ_DIR_BOTH;
if (alg == "snappy")
params.comp_algorithm = QZ_SNAPPY;
else if (alg == "zlib")
params.comp_algorithm = QZ_DEFLATE;
else if (alg == "lz4")
params.comp_algorithm = QZ_LZ4;
else
return false;
rc = qzSetDefaults(¶ms);
if (rc != QZ_OK)
return false;
rc = qzInit(&session, QZ_SW_BACKUP_DEFAULT);
if (rc != QZ_OK && rc != QZ_DUPLICATE && rc != QZ_NO_HW)
return false;
rc = qzSetupSession(&session, ¶ms);
if (rc != QZ_OK && rc != QZ_DUPLICATE && rc != QZ_NO_HW ) {
qzTeardownSession(&session);
qzClose(&session);
return false;
}
return true;
}
int QatAccel::compress(const bufferlist &in, bufferlist &out) {
for (auto &i : in.buffers()) {
const unsigned char* c_in = (unsigned char*) i.c_str();
unsigned int len = i.length();
unsigned int out_len = qzMaxCompressedLength(len);
bufferptr ptr = buffer::create_small_page_aligned(out_len);
int rc = qzCompress(&session, c_in, &len, (unsigned char *)ptr.c_str(), &out_len, 1);
if (rc != QZ_OK)
return -1;
out.append(ptr, 0, out_len);
}
return 0;
}
int QatAccel::decompress(const bufferlist &in, bufferlist &out) {
auto i = in.begin();
return decompress(i, in.length(), out);
}
int QatAccel::decompress(bufferlist::const_iterator &p,
size_t compressed_len,
bufferlist &dst) {
unsigned int ratio_idx = 0;
bool read_more = false;
bool joint = false;
int rc = 0;
bufferlist tmp;
size_t remaining = MIN(p.get_remaining(), compressed_len);
while (remaining) {
if (p.end()) {
return -1;
}
bufferptr cur_ptr = p.get_current_ptr();
unsigned int len = cur_ptr.length();
if (joint) {
if (read_more)
tmp.append(cur_ptr.c_str(), len);
len = tmp.length();
}
unsigned int out_len = len * expansion_ratio[ratio_idx];
bufferptr ptr = buffer::create_small_page_aligned(out_len);
if (joint)
rc = qzDecompress(&session, (const unsigned char*)tmp.c_str(), &len, (unsigned char*)ptr.c_str(), &out_len);
else
rc = qzDecompress(&session, (const unsigned char*)cur_ptr.c_str(), &len, (unsigned char*)ptr.c_str(), &out_len);
if (rc == QZ_DATA_ERROR) {
if (!joint) {
tmp.append(cur_ptr.c_str(), cur_ptr.length());
p.advance(remaining);
joint = true;
}
read_more = true;
continue;
} else if (rc == QZ_BUF_ERROR) {
if (ratio_idx == std::size(expansion_ratio))
return -1;
if (joint)
read_more = false;
ratio_idx++;
continue;
} else if (rc != QZ_OK) {
return -1;
} else {
ratio_idx = 0;
joint = false;
read_more = false;
}
p.advance(remaining);
remaining -= len;
dst.append(ptr, 0, out_len);
}
return 0;
}
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