RPCRDMA: Kconfig and header file with rpcrdma protocol definitions (c3a57ed7) · Commits · 戴 / test

fs/Kconfig

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		@@ -1728,6 +1728,14 @@ config SUNRPC
		config SUNRPC_GSS
		tristate

		config SUNRPC_XPRT_RDMA
		tristate "RDMA transport for sunrpc (EXPERIMENTAL)"
		depends on SUNRPC && EXPERIMENTAL
		default m
		help
		Adds a client RPC transport for supporting kernel NFS over RDMA
		mounts, including Infiniband and iWARP. Experimental.

		config SUNRPC_BIND34
		bool "Support for rpcbind versions 3 & 4 (EXPERIMENTAL)"
		depends on SUNRPC && EXPERIMENTAL

include/linux/sunrpc/rpc_rdma.h

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		/*
		* Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
		*
		* This software is available to you under a choice of one of two
		* licenses. You may choose to be licensed under the terms of the GNU
		* General Public License (GPL) Version 2, available from the file
		* COPYING in the main directory of this source tree, or the BSD-type
		* license below:
		*
		* 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 the Network Appliance, Inc. 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 _LINUX_SUNRPC_RPC_RDMA_H
		#define _LINUX_SUNRPC_RPC_RDMA_H

		struct rpcrdma_segment {
		uint32_t rs_handle; /* Registered memory handle */
		uint32_t rs_length; /* Length of the chunk in bytes */
		uint64_t rs_offset; /* Chunk virtual address or offset */
		};

		/*
		* read chunk(s), encoded as a linked list.
		*/
		struct rpcrdma_read_chunk {
		uint32_t rc_discrim; /* 1 indicates presence */
		uint32_t rc_position; /* Position in XDR stream */
		struct rpcrdma_segment rc_target;
		};

		/*
		* write chunk, and reply chunk.
		*/
		struct rpcrdma_write_chunk {
		struct rpcrdma_segment wc_target;
		};

		/*
		* write chunk(s), encoded as a counted array.
		*/
		struct rpcrdma_write_array {
		uint32_t wc_discrim; /* 1 indicates presence */
		uint32_t wc_nchunks; /* Array count */
		struct rpcrdma_write_chunk wc_array[0];
		};

		struct rpcrdma_msg {
		uint32_t rm_xid; /* Mirrors the RPC header xid */
		uint32_t rm_vers; /* Version of this protocol */
		uint32_t rm_credit; /* Buffers requested/granted */
		uint32_t rm_type; /* Type of message (enum rpcrdma_proc) */
		union {

		struct { /* no chunks */
		uint32_t rm_empty[3]; /* 3 empty chunk lists */
		} rm_nochunks;

		struct { /* no chunks and padded */
		uint32_t rm_align; /* Padding alignment */
		uint32_t rm_thresh; /* Padding threshold */
		uint32_t rm_pempty[3]; /* 3 empty chunk lists */
		} rm_padded;

		uint32_t rm_chunks[0]; /* read, write and reply chunks */

		} rm_body;
		};

		#define RPCRDMA_HDRLEN_MIN 28

		enum rpcrdma_errcode {
		ERR_VERS = 1,
		ERR_CHUNK = 2
		};

		struct rpcrdma_err_vers {
		uint32_t rdma_vers_low; /* Version range supported by peer */
		uint32_t rdma_vers_high;
		};

		enum rpcrdma_proc {
		RDMA_MSG = 0, /* An RPC call or reply msg */
		RDMA_NOMSG = 1, /* An RPC call or reply msg - separate body */
		RDMA_MSGP = 2, /* An RPC call or reply msg with padding */
		RDMA_DONE = 3, /* Client signals reply completion */
		RDMA_ERROR = 4 /* An RPC RDMA encoding error */
		};

		#endif /* _LINUX_SUNRPC_RPC_RDMA_H */

include/linux/sunrpc/xprtrdma.h

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		/*
		* Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
		*
		* This software is available to you under a choice of one of two
		* licenses. You may choose to be licensed under the terms of the GNU
		* General Public License (GPL) Version 2, available from the file
		* COPYING in the main directory of this source tree, or the BSD-type
		* license below:
		*
		* 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 the Network Appliance, Inc. 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 _LINUX_SUNRPC_XPRTRDMA_H
		#define _LINUX_SUNRPC_XPRTRDMA_H

		/*
		* RPC transport identifier for RDMA
		*/
		#define XPRT_TRANSPORT_RDMA 256

		/*
		* rpcbind (v3+) RDMA netid.
		*/
		#define RPCBIND_NETID_RDMA "rdma"

		/*
		* Constants. Max RPC/NFS header is big enough to account for
		* additional marshaling buffers passed down by Linux client.
		*
		* RDMA header is currently fixed max size, and is big enough for a
		* fully-chunked NFS message (read chunks are the largest). Note only
		* a single chunk type per message is supported currently.
		*/
		#define RPCRDMA_MIN_SLOT_TABLE (2U)
		#define RPCRDMA_DEF_SLOT_TABLE (32U)
		#define RPCRDMA_MAX_SLOT_TABLE (256U)

		#define RPCRDMA_DEF_INLINE (1024) /* default inline max */

		#define RPCRDMA_INLINE_PAD_THRESH (512)/* payload threshold to pad (bytes) */

		#define RDMA_RESOLVE_TIMEOUT (5HZ) / TBD 5 seconds */
		#define RDMA_CONNECT_RETRY_MAX (2) /* retries if no listener backlog */

		/* memory registration strategies */
		#define RPCRDMA_PERSISTENT_REGISTRATION (1)

		enum rpcrdma_memreg {
		RPCRDMA_BOUNCEBUFFERS = 0,
		RPCRDMA_REGISTER,
		RPCRDMA_MEMWINDOWS,
		RPCRDMA_MEMWINDOWS_ASYNC,
		RPCRDMA_MTHCAFMR,
		RPCRDMA_ALLPHYSICAL,
		RPCRDMA_LAST
		};

		#endif /* _LINUX_SUNRPC_XPRTRDMA_H */

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