SIMD implementation of vdev_raidz generate and reconstruct routines

This is a new implementation of RAIDZ1/2/3 routines using x86_64
scalar, SSE, and AVX2 instruction sets. Included are 3 parity
generation routines (P, PQ, and PQR) and 7 reconstruction routines,
for all RAIDZ level. On module load, a quick benchmark of supported
routines will select the fastest for each operation and they will
be used at runtime. Original implementation is still present and
can be selected via module parameter.

Patch contains:
- specialized gen/rec routines for all RAIDZ levels,
- new scalar raidz implementation (unrolled),
- two x86_64 SIMD implementations (SSE and AVX2 instructions sets),
- fastest routines selected on module load (benchmark).
- cmd/raidz_test - verify and benchmark all implementations
- added raidz_test to the ZFS Test Suite

New zfs module parameters:
- zfs_vdev_raidz_impl (str): selects the implementation to use. On
  module load, the parameter will only accept first 3 options, and
  the other implementations can be set once module is finished
  loading. Possible values for this option are:
    "fastest" - use the fastest math available
    "original" - use the original raidz code
    "scalar" - new scalar impl
    "sse" - new SSE impl if available
    "avx2" - new AVX2 impl if available

See contents of `/sys/module/zfs/parameters/zfs_vdev_raidz_impl` to
get the list of supported values. If an implementation is not supported
on the system, it will not be shown. Currently selected option is
enclosed in `[]`.

Signed-off-by: Gvozden Neskovic <[email protected]>
Signed-off-by: Brian Behlendorf <[email protected]>
Closes #4328

1 files changed, 64 insertions, 0 deletions

diff --git a/include/sys/vdev_raidz.h b/include/sys/vdev_raidz.h
new file mode 100644
index 000000000..d0c682ee4
--- /dev/null
+++ b/include/sys/vdev_raidz.h
@@ -0,0 +1,64 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright (C) 2016 Gvozden Neskovic <[email protected]>.
+ */
+
+#ifndef _SYS_VDEV_RAIDZ_H
+#define	_SYS_VDEV_RAIDZ_H
+
+#include <sys/types.h>
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+struct zio;
+struct raidz_map;
+#if !defined(_KERNEL)
+struct kernel_param {};
+#endif
+
+/*
+ * vdev_raidz interface
+ */
+struct raidz_map *	vdev_raidz_map_alloc(struct zio *, uint64_t, uint64_t,
+			    uint64_t);
+void		vdev_raidz_map_free(struct raidz_map *);
+void 		vdev_raidz_generate_parity(struct raidz_map *);
+int 		vdev_raidz_reconstruct(struct raidz_map *, const int *, int);
+
+/*
+ * vdev_raidz_math interface
+ */
+void	vdev_raidz_math_init(void);
+void	vdev_raidz_math_fini(void);
+void	vdev_raidz_math_get_ops(struct raidz_map *);
+void	vdev_raidz_math_generate(struct raidz_map *);
+int	vdev_raidz_math_reconstruct(struct raidz_map *, const int *,
+	    const int *, const int);
+int	vdev_raidz_impl_set(const char *);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif /* _SYS_VDEV_RAIDZ_H */