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vhost: try to unroll for each loop

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Create macro for adding unroll pragma before for each loop. Batch
functions will be contained of several small loops which can be
optimized by compilers' loop unrolling pragma.

Signed-off-by: Marvin Liu <yong.liu@intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
This commit is contained in:
Marvin Liu 2019-10-25 00:08:22 +08:00 committed by Ferruh Yigit
parent 93520085ef
commit 934274065a
3 changed files with 49 additions and 0 deletions
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18
lib/librte_vhost/Makefile
View File

@ -16,6 +16,24 @@ CFLAGS += -I vhost_user
CFLAGS += -fno-strict-aliasing
LDLIBS += -lpthread
ifeq ($(RTE_TOOLCHAIN), gcc)
ifeq ($(shell test $(GCC_VERSION) -ge 83 && echo 1), 1)
CFLAGS += -DVHOST_GCC_UNROLL_PRAGMA
endif
endif
ifeq ($(RTE_TOOLCHAIN), clang)
ifeq ($(shell test $(CLANG_MAJOR_VERSION)$(CLANG_MINOR_VERSION) -ge 37 && echo 1), 1)
CFLAGS += -DVHOST_CLANG_UNROLL_PRAGMA
endif
endif
ifeq ($(RTE_TOOLCHAIN), icc)
ifeq ($(shell test $(ICC_MAJOR_VERSION) -ge 16 && echo 1), 1)
CFLAGS += -DVHOST_ICC_UNROLL_PRAGMA
endif
endif
ifeq ($(CONFIG_RTE_LIBRTE_VHOST_NUMA),y)
LDLIBS += -lnuma
endif

7
lib/librte_vhost/meson.build
View File

@ -8,6 +8,13 @@ endif
if has_libnuma == 1
dpdk_conf.set10('RTE_LIBRTE_VHOST_NUMA', true)
endif
if (toolchain == 'gcc' and cc.version().version_compare('>=8.3.0'))
cflags += '-DVHOST_GCC_UNROLL_PRAGMA'
elif (toolchain == 'clang' and cc.version().version_compare('>=3.7.0'))
cflags += '-DVHOST_CLANG_UNROLL_PRAGMA'
elif (toolchain == 'icc' and cc.version().version_compare('>=16.0.0'))
cflags += '-DVHOST_ICC_UNROLL_PRAGMA'
endif
dpdk_conf.set('RTE_LIBRTE_VHOST_POSTCOPY',
cc.has_header('linux/userfaultfd.h'))
version = 4

24
lib/librte_vhost/vhost.h
View File

@ -39,6 +39,30 @@
#define VHOST_LOG_CACHE_NR 32
#define PACKED_BATCH_SIZE (RTE_CACHE_LINE_SIZE / \
sizeof(struct vring_packed_desc))
#define PACKED_BATCH_MASK (PACKED_BATCH_SIZE - 1)
#ifdef VHOST_GCC_UNROLL_PRAGMA
#define vhost_for_each_try_unroll(iter, val, size) _Pragma("GCC unroll 4") \
for (iter = val; iter < size; iter++)
#endif
#ifdef VHOST_CLANG_UNROLL_PRAGMA
#define vhost_for_each_try_unroll(iter, val, size) _Pragma("unroll 4") \
for (iter = val; iter < size; iter++)
#endif
#ifdef VHOST_ICC_UNROLL_PRAGMA
#define vhost_for_each_try_unroll(iter, val, size) _Pragma("unroll (4)") \
for (iter = val; iter < size; iter++)
#endif
#ifndef vhost_for_each_try_unroll
#define vhost_for_each_try_unroll(iter, val, num) \
for (iter = val; iter < num; iter++)
#endif
/**
* Structure contains buffer address, length and descriptor index
* from vring to do scatter RX.