[mirror_ubuntu-artful-kernel.git] / include / linux / sunrpc / rpc_rdma.h

/*
 * 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

#include <linux/types.h>

struct rpcrdma_segment {
	__be32 rs_handle;	/* Registered memory handle */
	__be32 rs_length;	/* Length of the chunk in bytes */
	__be64 rs_offset;	/* Chunk virtual address or offset */
};

/*
 * read chunk(s), encoded as a linked list.
 */
struct rpcrdma_read_chunk {
	__be32 rc_discrim;	/* 1 indicates presence */
	__be32 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 {
	__be32 wc_discrim;	/* 1 indicates presence */
	__be32 wc_nchunks;	/* Array count */
	struct rpcrdma_write_chunk wc_array[0];
};

struct rpcrdma_msg {
	__be32 rm_xid;	/* Mirrors the RPC header xid */
	__be32 rm_vers;	/* Version of this protocol */
	__be32 rm_credit;	/* Buffers requested/granted */
	__be32 rm_type;	/* Type of message (enum rpcrdma_proc) */
	union {

		struct {			/* no chunks */
			__be32 rm_empty[3];	/* 3 empty chunk lists */
		} rm_nochunks;

		struct {			/* no chunks and padded */
			__be32 rm_align;	/* Padding alignment */
			__be32 rm_thresh;	/* Padding threshold */
			__be32 rm_pempty[3];	/* 3 empty chunk lists */
		} rm_padded;

		__be32 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 */
Commit	Line	Data
c3a57ed7 TT	1	/*
	2	* Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
	3	*
	4	* This software is available to you under a choice of one of two
	5	* licenses. You may choose to be licensed under the terms of the GNU
	6	* General Public License (GPL) Version 2, available from the file
	7	* COPYING in the main directory of this source tree, or the BSD-type
	8	* license below:
	9	*
	10	* Redistribution and use in source and binary forms, with or without
	11	* modification, are permitted provided that the following conditions
	12	* are met:
	13	*
	14	* Redistributions of source code must retain the above copyright
	15	* notice, this list of conditions and the following disclaimer.
	16	*
	17	* Redistributions in binary form must reproduce the above
	18	* copyright notice, this list of conditions and the following
	19	* disclaimer in the documentation and/or other materials provided
	20	* with the distribution.
	21	*
	22	* Neither the name of the Network Appliance, Inc. nor the names of
	23	* its contributors may be used to endorse or promote products
	24	* derived from this software without specific prior written
	25	* permission.
	26	*
	27	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	28	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	29	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	30	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	31	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	32	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	33	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	34	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	35	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	36	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	37	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	38	*/
	39
	40	#ifndef _LINUX_SUNRPC_RPC_RDMA_H
	41	#define _LINUX_SUNRPC_RPC_RDMA_H
	42
a600ffcb BH	43	#include <linux/types.h>
a600ffcb BH	44
c3a57ed7	45	struct rpcrdma_segment {
2d8a9726 AV	46	__be32 rs_handle; /* Registered memory handle */
	47	__be32 rs_length; /* Length of the chunk in bytes */
	48	__be64 rs_offset; /* Chunk virtual address or offset */
c3a57ed7 TT	49	};
	50
	51	/*
	52	* read chunk(s), encoded as a linked list.
	53	*/
	54	struct rpcrdma_read_chunk {
2d8a9726 AV	55	__be32 rc_discrim; /* 1 indicates presence */
2d8a9726 AV	56	__be32 rc_position; /* Position in XDR stream */
c3a57ed7 TT	57	struct rpcrdma_segment rc_target;
	58	};
	59
	60	/*
	61	* write chunk, and reply chunk.
	62	*/
	63	struct rpcrdma_write_chunk {
	64	struct rpcrdma_segment wc_target;
	65	};
	66
	67	/*
	68	* write chunk(s), encoded as a counted array.
	69	*/
	70	struct rpcrdma_write_array {
2d8a9726 AV	71	__be32 wc_discrim; /* 1 indicates presence */
2d8a9726 AV	72	__be32 wc_nchunks; /* Array count */
c3a57ed7 TT	73	struct rpcrdma_write_chunk wc_array[0];
	74	};
	75
	76	struct rpcrdma_msg {
2d8a9726 AV	77	__be32 rm_xid; /* Mirrors the RPC header xid */
	78	__be32 rm_vers; /* Version of this protocol */
	79	__be32 rm_credit; /* Buffers requested/granted */
	80	__be32 rm_type; /* Type of message (enum rpcrdma_proc) */
c3a57ed7 TT	81	union {
	82
	83	struct { /* no chunks */
2d8a9726	84	__be32 rm_empty[3]; /* 3 empty chunk lists */
c3a57ed7 TT	85	} rm_nochunks;
	86
	87	struct { /* no chunks and padded */
2d8a9726 AV	88	__be32 rm_align; /* Padding alignment */
	89	__be32 rm_thresh; /* Padding threshold */
	90	__be32 rm_pempty[3]; /* 3 empty chunk lists */
c3a57ed7 TT	91	} rm_padded;
c3a57ed7 TT	92
2d8a9726	93	__be32 rm_chunks[0]; /* read, write and reply chunks */
c3a57ed7 TT	94
	95	} rm_body;
	96	};
	97
	98	#define RPCRDMA_HDRLEN_MIN 28
	99
	100	enum rpcrdma_errcode {
	101	ERR_VERS = 1,
	102	ERR_CHUNK = 2
	103	};
	104
	105	struct rpcrdma_err_vers {
	106	uint32_t rdma_vers_low; /* Version range supported by peer */
	107	uint32_t rdma_vers_high;
	108	};
	109
	110	enum rpcrdma_proc {
	111	RDMA_MSG = 0, /* An RPC call or reply msg */
	112	RDMA_NOMSG = 1, /* An RPC call or reply msg - separate body */
	113	RDMA_MSGP = 2, /* An RPC call or reply msg with padding */
	114	RDMA_DONE = 3, /* Client signals reply completion */
	115	RDMA_ERROR = 4 /* An RPC RDMA encoding error */
	116	};
	117
	118	#endif /* _LINUX_SUNRPC_RPC_RDMA_H */