Use of RTE ring buffer API from DPDK in vdev disk AIO back-end (openz…

…fs#42)

* Use of RTE ring buffer API from DPDK in vdev disk AIO backend

Makefile.am

@@ -51,7 +51,7 @@ commitcheck:
 
 cstyle:
 	@find ${top_srcdir} -name '*.[hc]' ! -name 'zfs_config.*' \
-		! -name '*.mod.c' -type f -exec scripts/cstyle.pl -cpP {} \+
+		! -name '*.mod.c' ! -name 'rte_*.[hc]' -type f -exec scripts/cstyle.pl -cpP {} \+
 
 shellcheck:
 	@if type shellcheck > /dev/null 2>&1; then \

include/Makefile.am

@@ -23,7 +23,14 @@ USER_H = \
 	$(top_srcdir)/include/libzfs_core.h \
 	$(top_srcdir)/include/libzfs_impl.h \
 	$(top_srcdir)/include/uzfs_io.h \
-	$(top_srcdir)/include/uzfs_mgmt.h
+	$(top_srcdir)/include/uzfs_mgmt.h \
+	$(top_srcdir)/include/rte_ring.h \
+	$(top_srcdir)/include/rte_atomic_64.h \
+	$(top_srcdir)/include/rte_atomic_generic.h \
+	$(top_srcdir)/include/rte_atomic.h \
+	$(top_srcdir)/include/rte_common.h \
+	$(top_srcdir)/include/rte_memory.h \
+	$(top_srcdir)/include/rte_pause.h
 
 EXTRA_DIST = $(COMMON_H) $(KERNEL_H) $(USER_H)
 

include/rte_atomic.h

@@ -0,0 +1,229 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _RTE_ATOMIC_X86_H_
+#define _RTE_ATOMIC_X86_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+#include <rte_common.h>
+#include <emmintrin.h>
+
+#if RTE_MAX_LCORE == 1
+#define MPLOCKED                        /**< No need to insert MP lock prefix. */
+#else
+#define MPLOCKED        "lock ; "       /**< Insert MP lock prefix. */
+#endif
+
+#define	rte_mb() _mm_mfence()
+
+#define	rte_wmb() _mm_sfence()
+
+#define	rte_rmb() _mm_lfence()
+
+#define rte_smp_mb() rte_mb()
+
+#define rte_smp_wmb() rte_compiler_barrier()
+
+#define rte_smp_rmb() rte_compiler_barrier()
+
+#define rte_io_mb() rte_mb()
+
+#define rte_io_wmb() rte_compiler_barrier()
+
+#define rte_io_rmb() rte_compiler_barrier()
+
+/*------------------------- 16 bit atomic operations -------------------------*/
+
+#ifndef RTE_FORCE_INTRINSICS
+static inline int
+rte_atomic16_cmpset(volatile uint16_t *dst, uint16_t exp, uint16_t src)
+{
+	uint8_t res;
+
+	asm volatile(
+			MPLOCKED
+			"cmpxchgw %[src], %[dst];"
+			"sete %[res];"
+			: [res] "=a" (res),     /* output */
+			  [dst] "=m" (*dst)
+			: [src] "r" (src),      /* input */
+			  "a" (exp),
+			  "m" (*dst)
+			: "memory");            /* no-clobber list */
+	return res;
+}
+
+static inline int rte_atomic16_test_and_set(rte_atomic16_t *v)
+{
+	return rte_atomic16_cmpset((volatile uint16_t *)&v->cnt, 0, 1);
+}
+
+static inline void
+rte_atomic16_inc(rte_atomic16_t *v)
+{
+	asm volatile(
+			MPLOCKED
+			"incw %[cnt]"
+			: [cnt] "=m" (v->cnt)   /* output */
+			: "m" (v->cnt)          /* input */
+			);
+}
+
+static inline void
+rte_atomic16_dec(rte_atomic16_t *v)
+{
+	asm volatile(
+			MPLOCKED
+			"decw %[cnt]"
+			: [cnt] "=m" (v->cnt)   /* output */
+			: "m" (v->cnt)          /* input */
+			);
+}
+
+static inline int rte_atomic16_inc_and_test(rte_atomic16_t *v)
+{
+	uint8_t ret;
+
+	asm volatile(
+			MPLOCKED
+			"incw %[cnt] ; "
+			"sete %[ret]"
+			: [cnt] "+m" (v->cnt),  /* output */
+			  [ret] "=qm" (ret)
+			);
+	return ret != 0;
+}
+
+static inline int rte_atomic16_dec_and_test(rte_atomic16_t *v)
+{
+	uint8_t ret;
+
+	asm volatile(MPLOCKED
+			"decw %[cnt] ; "
+			"sete %[ret]"
+			: [cnt] "+m" (v->cnt),  /* output */
+			  [ret] "=qm" (ret)
+			);
+	return ret != 0;
+}
+
+/*------------------------- 32 bit atomic operations -------------------------*/
+
+static inline int
+rte_atomic32_cmpset(volatile uint32_t *dst, uint32_t exp, uint32_t src)
+{
+	uint8_t res;
+
+	asm volatile(
+			MPLOCKED
+			"cmpxchgl %[src], %[dst];"
+			"sete %[res];"
+			: [res] "=a" (res),     /* output */
+			  [dst] "=m" (*dst)
+			: [src] "r" (src),      /* input */
+			  "a" (exp),
+			  "m" (*dst)
+			: "memory");            /* no-clobber list */
+	return res;
+}
+
+static inline int rte_atomic32_test_and_set(rte_atomic32_t *v)
+{
+	return rte_atomic32_cmpset((volatile uint32_t *)&v->cnt, 0, 1);
+}
+
+static inline void
+rte_atomic32_inc(rte_atomic32_t *v)
+{
+	asm volatile(
+			MPLOCKED
+			"incl %[cnt]"
+			: [cnt] "=m" (v->cnt)   /* output */
+			: "m" (v->cnt)          /* input */
+			);
+}
+
+static inline void
+rte_atomic32_dec(rte_atomic32_t *v)
+{
+	asm volatile(
+			MPLOCKED
+			"decl %[cnt]"
+			: [cnt] "=m" (v->cnt)   /* output */
+			: "m" (v->cnt)          /* input */
+			);
+}
+
+static inline int rte_atomic32_inc_and_test(rte_atomic32_t *v)
+{
+	uint8_t ret;
+
+	asm volatile(
+			MPLOCKED
+			"incl %[cnt] ; "
+			"sete %[ret]"
+			: [cnt] "+m" (v->cnt),  /* output */
+			  [ret] "=qm" (ret)
+			);
+	return ret != 0;
+}
+
+static inline int rte_atomic32_dec_and_test(rte_atomic32_t *v)
+{
+	uint8_t ret;
+
+	asm volatile(MPLOCKED
+			"decl %[cnt] ; "
+			"sete %[ret]"
+			: [cnt] "+m" (v->cnt),  /* output */
+			  [ret] "=qm" (ret)
+			);
+	return ret != 0;
+}
+#endif
+
+#ifdef RTE_ARCH_I686
+#include "rte_atomic_32.h"
+#else
+#include "rte_atomic_64.h"
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RTE_ATOMIC_X86_H_ */