From: Qiaowei Ren <qiaowei.ren@intel.com>
Date: Fri, 29 Dec 2017 04:50:20 +0000 (+0800)
Subject: compressor: add QAT support
X-Git-Tag: v14.0.0~222^2
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=9f3965aef3f1ddf706119d7b2f5540c799f2da0e;p=ceph.git

compressor: add QAT support

This patch adds new QATzip plugin to support QAT for compression.

QATZip is a user space library which builds on top of the Intel
QAT (QuickAssist Technology) user space library, to provide extended
accelerated compression and decompression services by offloading the
actual compression and decompression request(s) to the hardware
QAT accelerators, which are more efficient in terms of cost and power
than general purpose CPUs for those specific compute-intensive
workloads.

Based on QAT accelerators, QATZip can support several compression
algorithm, including deflate, snappy, lz4, etc..

Signed-off-by: Qiaowei Ren <qiaowei.ren@intel.com>
---

diff --git a/CMakeLists.txt b/CMakeLists.txt
index bc4cb19bce0..d86acfd68b6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -258,6 +258,12 @@ endif()
 
 option(WITH_BLUEFS "libbluefs library" OFF)
 
+option(WITH_QATZIP "Enable QATZIP" OFF)
+if(WITH_QATZIP)
+  find_package(qatzip REQUIRED)
+  set(HAVE_QATZIP ${QATZIP_FOUND})
+endif(WITH_QATZIP)
+
 # needs mds and? XXX
 option(WITH_LIBCEPHFS "libcephfs client library" ON)
 
diff --git a/cmake/modules/Findqatzip.cmake b/cmake/modules/Findqatzip.cmake
new file mode 100644
index 00000000000..3a593228dd0
--- /dev/null
+++ b/cmake/modules/Findqatzip.cmake
@@ -0,0 +1,17 @@
+# - Find Qatzip
+# Find the qatzip compression library and includes
+#
+# QATZIP_INCLUDE_DIR - where to find qatzip.h, etc.
+# QATZIP_LIBRARIES - List of libraries when using qatzip.
+# QATZIP_FOUND - True if qatzip found.
+
+find_path(QATZIP_INCLUDE_DIR NAMES qatzip.h)
+
+find_library(QATZIP_LIBRARIES NAMES qatzip)
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(qatzip DEFAULT_MSG QATZIP_LIBRARIES QATZIP_INCLUDE_DIR)
+
+mark_as_advanced(
+  QATZIP_LIBRARIES
+  QATZIP_INCLUDE_DIR)
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 874e7f3ae12..a5b975e66a0 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -648,6 +648,9 @@ endif()
 if(NOT WITH_SYSTEM_BOOST)
   list(APPEND ceph_common_deps ${ZLIB_LIBRARIES})
 endif()
+if(HAVE_QATZIP)
+  list(APPEND ceph_common_deps ${QATZIP_LIBRARIES})
+endif()
 
 set_source_files_properties(${CMAKE_SOURCE_DIR}/src/ceph_ver.c
   ${CMAKE_SOURCE_DIR}/src/common/version.cc
diff --git a/src/common/legacy_config_opts.h b/src/common/legacy_config_opts.h
index 69fbc51c193..981bd201972 100644
--- a/src/common/legacy_config_opts.h
+++ b/src/common/legacy_config_opts.h
@@ -94,6 +94,8 @@ OPTION(xio_max_send_inline, OPT_INT) // xio maximum threshold to send inline
 OPTION(compressor_zlib_isal, OPT_BOOL)
 OPTION(compressor_zlib_level, OPT_INT) //regular zlib compression level, not applicable to isa-l optimized version
 
+OPTION(qat_compressor_enabled, OPT_BOOL)
+
 OPTION(plugin_crypto_accelerator, OPT_STR)
 
 OPTION(mempool_debug, OPT_BOOL)
diff --git a/src/common/options.cc b/src/common/options.cc
index e5b3d2de839..8ad7db20fb8 100644
--- a/src/common/options.cc
+++ b/src/common/options.cc
@@ -776,6 +776,10 @@ std::vector<Option> get_global_options() {
     .set_default(5)
     .set_description(""),
 
+    Option("qat_compressor_enabled", Option::TYPE_BOOL, Option::LEVEL_ADVANCED)
+    .set_default(false)
+    .set_description("enable qat acceleration support for compression"),
+
     Option("plugin_crypto_accelerator", Option::TYPE_STR, Option::LEVEL_ADVANCED)
     .set_default("crypto_isal")
     .set_description(""),
diff --git a/src/compressor/CMakeLists.txt b/src/compressor/CMakeLists.txt
index 4caa3fca725..6a401679092 100644
--- a/src/compressor/CMakeLists.txt
+++ b/src/compressor/CMakeLists.txt
@@ -1,6 +1,9 @@
 
-set(compressor_srcs 
+set(compressor_srcs
   Compressor.cc)
+if (HAVE_QATZIP)
+  list(APPEND compressor_srcs QatAccel.cc)
+endif()
 add_library(compressor_objs OBJECT ${compressor_srcs})
 
 ## compressor plugins
@@ -38,6 +41,9 @@ add_custom_target(compressor_plugins DEPENDS
 if(WITH_EMBEDDED)
   include(MergeStaticLibraries)
   add_library(cephd_compressor_base STATIC ${compressor_srcs})
+  if(HAVE_QATZIP)
+    target_link_libraries(cephd_compressor_base ${QATZIP_LIBRARIES})
+  endif()
   set_target_properties(cephd_compressor_base PROPERTIES COMPILE_DEFINITIONS BUILDING_FOR_EMBEDDED)
   set(cephd_compressor_libs
       cephd_compressor_base
diff --git a/src/compressor/Compressor.h b/src/compressor/Compressor.h
index cf3c40d4520..c78e215ce96 100644
--- a/src/compressor/Compressor.h
+++ b/src/compressor/Compressor.h
@@ -23,6 +23,9 @@
 #include "include/assert.h"    // boost clobbers this
 #include "include/buffer.h"
 #include "include/int_types.h"
+#ifdef HAVE_QATZIP
+  #include "QatAccel.h"
+#endif
 
 class Compressor;
 typedef std::shared_ptr<Compressor> CompressorRef;
@@ -65,6 +68,11 @@ public:
     COMP_FORCE                  ///< compress always
   };
 
+#ifdef HAVE_QATZIP
+  bool qat_enabled;
+  QatAccel qat_accel;
+#endif
+
   static std::string get_comp_alg_name(int a);
   static boost::optional<CompressionAlgorithm> get_comp_alg_type(const std::string &s);
 
diff --git a/src/compressor/QatAccel.cc b/src/compressor/QatAccel.cc
new file mode 100644
index 00000000000..fe2ed4a5636
--- /dev/null
+++ b/src/compressor/QatAccel.cc
@@ -0,0 +1,141 @@
+/*
+ * 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(&params);
+  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(&params);
+  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, &params);
+  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_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) {
+  bufferlist::iterator i = const_cast<bufferlist&>(in).begin();
+  return decompress(i, in.length(), out);
+}
+
+int QatAccel::decompress(bufferlist::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_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;
+}
diff --git a/src/compressor/QatAccel.h b/src/compressor/QatAccel.h
new file mode 100644
index 00000000000..b64f7845c09
--- /dev/null
+++ b/src/compressor/QatAccel.h
@@ -0,0 +1,35 @@
+/*
+ * 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.
+ *
+ */
+
+#ifndef CEPH_QATACCEL_H
+#define CEPH_QATACCEL_H
+
+#include <qatzip.h>
+#include "include/buffer.h"
+
+class QatAccel {
+  QzSession_T session;
+
+ public:
+  QatAccel() : session({0}) {}
+  ~QatAccel();
+
+  bool init(const std::string &alg);
+
+  int compress(const bufferlist &in, bufferlist &out);
+  int decompress(const bufferlist &in, bufferlist &out);
+  int decompress(bufferlist::iterator &p, size_t compressed_len, bufferlist &dst);
+};
+
+#endif
diff --git a/src/compressor/lz4/CompressionPluginLZ4.h b/src/compressor/lz4/CompressionPluginLZ4.h
index 82227ae1659..7e8cdf676cf 100644
--- a/src/compressor/lz4/CompressionPluginLZ4.h
+++ b/src/compressor/lz4/CompressionPluginLZ4.h
@@ -30,7 +30,7 @@ public:
 
   int factory(CompressorRef *cs, std::ostream *ss) override {
     if (compressor == 0) {
-      LZ4Compressor *interface = new LZ4Compressor();
+      LZ4Compressor *interface = new LZ4Compressor(cct);
       compressor = CompressorRef(interface);
     }
     *cs = compressor;
diff --git a/src/compressor/lz4/LZ4Compressor.h b/src/compressor/lz4/LZ4Compressor.h
index b81eafc4d72..5441c7cbf24 100644
--- a/src/compressor/lz4/LZ4Compressor.h
+++ b/src/compressor/lz4/LZ4Compressor.h
@@ -20,14 +20,26 @@
 #include "compressor/Compressor.h"
 #include "include/buffer.h"
 #include "include/encoding.h"
+#include "common/config.h"
 #include "common/Tub.h"
 
 
 class LZ4Compressor : public Compressor {
  public:
-  LZ4Compressor() : Compressor(COMP_ALG_LZ4, "lz4") {}
+  LZ4Compressor(CephContext* cct) : Compressor(COMP_ALG_LZ4, "lz4") {
+#ifdef HAVE_QATZIP
+    if (cct->_conf->qat_compressor_enabled && qat_accel.init("lz4"))
+      qat_enabled = true;
+    else
+      qat_enabled = false;
+#endif
+  }
 
   int compress(const bufferlist &src, bufferlist &dst) override {
+#ifdef HAVE_QATZIP
+    if (qat_enabled)
+      return qat_accel.compress(src, dst);
+#endif
     bufferptr outptr = buffer::create_page_aligned(
       LZ4_compressBound(src.length()));
     LZ4_stream_t lz4_stream;
@@ -60,6 +72,10 @@ class LZ4Compressor : public Compressor {
   }
 
   int decompress(const bufferlist &src, bufferlist &dst) override {
+#ifdef HAVE_QATZIP
+    if (qat_enabled)
+      return qat_accel.decompress(src, dst);
+#endif
     bufferlist::iterator i = const_cast<bufferlist&>(src).begin();
     return decompress(i, src.length(), dst);
   }
@@ -67,6 +83,10 @@ class LZ4Compressor : public Compressor {
   int decompress(bufferlist::iterator &p,
 		 size_t compressed_len,
 		 bufferlist &dst) override {
+#ifdef HAVE_QATZIP
+    if (qat_enabled)
+      return qat_accel.decompress(p, compressed_len, dst);
+#endif
     uint32_t count;
     std::vector<std::pair<uint32_t, uint32_t> > compressed_pairs;
     decode(count, p);
diff --git a/src/compressor/snappy/CompressionPluginSnappy.h b/src/compressor/snappy/CompressionPluginSnappy.h
index 758d606e0e6..19b69765c6e 100644
--- a/src/compressor/snappy/CompressionPluginSnappy.h
+++ b/src/compressor/snappy/CompressionPluginSnappy.h
@@ -31,7 +31,7 @@ public:
                       std::ostream *ss) override
   {
     if (compressor == 0) {
-      SnappyCompressor *interface = new SnappyCompressor();
+      SnappyCompressor *interface = new SnappyCompressor(cct);
       compressor = CompressorRef(interface);
     }
     *cs = compressor;
diff --git a/src/compressor/snappy/SnappyCompressor.h b/src/compressor/snappy/SnappyCompressor.h
index 44348f72bb9..7c3d46a1481 100644
--- a/src/compressor/snappy/SnappyCompressor.h
+++ b/src/compressor/snappy/SnappyCompressor.h
@@ -17,6 +17,7 @@
 
 #include <snappy.h>
 #include <snappy-sinksource.h>
+#include "common/config.h"
 #include "compressor/Compressor.h"
 #include "include/buffer.h"
 
@@ -56,9 +57,20 @@ class CEPH_BUFFER_API BufferlistSource : public snappy::Source {
 
 class SnappyCompressor : public Compressor {
  public:
-  SnappyCompressor() : Compressor(COMP_ALG_SNAPPY, "snappy") {}
+  SnappyCompressor(CephContext* cct) : Compressor(COMP_ALG_SNAPPY, "snappy") {
+#ifdef HAVE_QATZIP
+    if (cct->_conf->qat_compressor_enabled && qat_accel.init("snappy"))
+      qat_enabled = true;
+    else
+      qat_enabled = false;
+#endif
+  }
 
   int compress(const bufferlist &src, bufferlist &dst) override {
+#ifdef HAVE_QATZIP
+    if (qat_enabled)
+      return qat_accel.compress(src, dst);
+#endif
     BufferlistSource source(const_cast<bufferlist&>(src).begin(), src.length());
     bufferptr ptr = buffer::create_page_aligned(
       snappy::MaxCompressedLength(src.length()));
@@ -69,6 +81,10 @@ class SnappyCompressor : public Compressor {
   }
 
   int decompress(const bufferlist &src, bufferlist &dst) override {
+#ifdef HAVE_QATZIP
+    if (qat_enabled)
+      return qat_accel.decompress(src, dst);
+#endif
     bufferlist::iterator i = const_cast<bufferlist&>(src).begin();
     return decompress(i, src.length(), dst);
   }
@@ -76,6 +92,10 @@ class SnappyCompressor : public Compressor {
   int decompress(bufferlist::iterator &p,
 		 size_t compressed_len,
 		 bufferlist &dst) override {
+#ifdef HAVE_QATZIP
+    if (qat_enabled)
+      return qat_accel.decompress(p, compressed_len, dst);
+#endif
     snappy::uint32 res_len = 0;
     BufferlistSource source_1(p, compressed_len);
     if (!snappy::GetUncompressedLength(&source_1, &res_len)) {
diff --git a/src/compressor/zlib/CompressionPluginZlib.h b/src/compressor/zlib/CompressionPluginZlib.h
index 4515f2bba05..38320c0c0a1 100644
--- a/src/compressor/zlib/CompressionPluginZlib.h
+++ b/src/compressor/zlib/CompressionPluginZlib.h
@@ -19,7 +19,6 @@
 #include "arch/probe.h"
 #include "arch/intel.h"
 #include "arch/arm.h"
-#include "common/config.h"
 #include "compressor/CompressionPlugin.h"
 #include "ZlibCompressor.h"
 
diff --git a/src/compressor/zlib/ZlibCompressor.cc b/src/compressor/zlib/ZlibCompressor.cc
index a6a9722bfc6..e3553240f2a 100644
--- a/src/compressor/zlib/ZlibCompressor.cc
+++ b/src/compressor/zlib/ZlibCompressor.cc
@@ -163,6 +163,10 @@ int ZlibCompressor::isal_compress(const bufferlist &in, bufferlist &out)
 
 int ZlibCompressor::compress(const bufferlist &in, bufferlist &out)
 {
+#ifdef HAVE_QATZIP
+  if (qat_enabled)
+    return qat_accel.compress(in, out);
+#endif
 #if __x86_64__ && defined(HAVE_BETTER_YASM_ELF64)
   if (isal_enabled)
     return isal_compress(in, out);
@@ -175,6 +179,11 @@ int ZlibCompressor::compress(const bufferlist &in, bufferlist &out)
 
 int ZlibCompressor::decompress(bufferlist::iterator &p, size_t compressed_size, bufferlist &out)
 {
+#ifdef HAVE_QATZIP
+  if (qat_enabled)
+    return qat_accel.decompress(p, compressed_size, out);
+#endif
+
   int ret;
   unsigned have;
   z_stream strm;
@@ -228,6 +237,10 @@ int ZlibCompressor::decompress(bufferlist::iterator &p, size_t compressed_size,
 
 int ZlibCompressor::decompress(const bufferlist &in, bufferlist &out)
 {
+#ifdef HAVE_QATZIP
+  if (qat_enabled)
+    return qat_accel.decompress(in, out);
+#endif
   bufferlist::iterator i = const_cast<bufferlist&>(in).begin();
   return decompress(i, in.length(), out);
 }
diff --git a/src/compressor/zlib/ZlibCompressor.h b/src/compressor/zlib/ZlibCompressor.h
index 198450dc01f..f1e614d5f04 100644
--- a/src/compressor/zlib/ZlibCompressor.h
+++ b/src/compressor/zlib/ZlibCompressor.h
@@ -17,6 +17,7 @@
 #ifndef CEPH_COMPRESSION_ZLIB_H
 #define CEPH_COMPRESSION_ZLIB_H
 
+#include "common/config.h"
 #include "compressor/Compressor.h"
 
 class ZlibCompressor : public Compressor {
@@ -24,7 +25,14 @@ class ZlibCompressor : public Compressor {
   CephContext *const cct;
 public:
   ZlibCompressor(CephContext *cct, bool isal)
-    : Compressor(COMP_ALG_ZLIB, "zlib"), isal_enabled(isal), cct(cct) {}
+    : Compressor(COMP_ALG_ZLIB, "zlib"), isal_enabled(isal), cct(cct) {
+#ifdef HAVE_QATZIP
+    if (cct->_conf->qat_compressor_enabled && qat_accel.init("zlib"))
+      qat_enabled = true;
+    else
+      qat_enabled = false;
+#endif
+  }
 
   int compress(const bufferlist &in, bufferlist &out) override;
   int decompress(const bufferlist &in, bufferlist &out) override;
diff --git a/src/include/config-h.in.cmake b/src/include/config-h.in.cmake
index ba3d27b2c92..40eb1792a99 100644
--- a/src/include/config-h.in.cmake
+++ b/src/include/config-h.in.cmake
@@ -342,4 +342,7 @@
 /* Defined if std::map::merge() is supported */
 #cmakedefine HAVE_STDLIB_MAP_SPLICING
 
+/* Defined if Intel QAT compress/decompress is supported */
+#cmakedefine HAVE_QATZIP
+
 #endif /* CONFIG_H */
diff --git a/src/test/compressor/test_compression.cc b/src/test/compressor/test_compression.cc
index 3da8592d81c..ad377c80511 100644
--- a/src/test/compressor/test_compression.cc
+++ b/src/test/compressor/test_compression.cc
@@ -480,3 +480,78 @@ TEST(ZlibCompressor, isal_compress_zlib_decompress_walk)
 }
 
 #endif	// __x86_64__
+
+#ifdef HAVE_QATZIP
+TEST(QAT, enc_qat_dec_noqat) {
+#ifdef HAVE_LZ4
+  const char* alg_collection[] = {"zlib", "lz4", "snappy"}; 
+#else
+  const char* alg_collection[] = {"zlib", "snappy"}; 
+#endif
+  for (auto alg : alg_collection) {
+    g_conf->set_val("qat_compressor_enabled", "true");
+    CompressorRef q = Compressor::create(g_ceph_context, alg);
+    g_conf->set_val("qat_compressor_enabled", "false");
+    CompressorRef noq = Compressor::create(g_ceph_context, alg);
+
+    // generate random buffer
+    for (int cnt=0; cnt<100; cnt++) {
+      srand(cnt + 1000);
+      int log2 = (rand()%18) + 1;
+      int size = (rand() % (1 << log2)) + 1;
+  
+      char test[size];
+      for (int i=0; i<size; ++i)
+        test[i] = rand()%256;
+      bufferlist in, out;
+      in.append(test, size);
+  
+      int res = q->compress(in, out);
+      EXPECT_EQ(res, 0);
+      bufferlist after;
+      res = noq->decompress(out, after);
+      EXPECT_EQ(res, 0);
+      bufferlist exp;
+      exp.append(test, size);
+      EXPECT_TRUE(exp.contents_equal(after));
+    }
+  }
+}
+
+TEST(QAT, enc_noqat_dec_qat) {
+#ifdef HAVE_LZ4
+  const char* alg_collection[] = {"zlib", "lz4", "snappy"}; 
+#else
+  const char* alg_collection[] = {"zlib", "snappy"}; 
+#endif
+  for (auto alg : alg_collection) {
+    g_conf->set_val("qat_compressor_enabled", "true");
+    CompressorRef q = Compressor::create(g_ceph_context, alg);
+    g_conf->set_val("qat_compressor_enabled", "false");
+    CompressorRef noq = Compressor::create(g_ceph_context, alg);
+
+    // generate random buffer
+    for (int cnt=0; cnt<100; cnt++) {
+      srand(cnt + 1000);
+      int log2 = (rand()%18) + 1;
+      int size = (rand() % (1 << log2)) + 1;
+  
+      char test[size];
+      for (int i=0; i<size; ++i)
+        test[i] = rand()%256;
+      bufferlist in, out;
+      in.append(test, size);
+  
+      int res = noq->compress(in, out);
+      EXPECT_EQ(res, 0);
+      bufferlist after;
+      res = q->decompress(out, after);
+      EXPECT_EQ(res, 0);
+      bufferlist exp;
+      exp.append(test, size);
+      EXPECT_TRUE(exp.contents_equal(after));
+    }
+  }
+}
+
+#endif	// HAVE_QATZIP