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marcus.erl |
/*
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* Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the BSD-type
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* license below:
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* Neither the name of the Network Appliance, Inc. nor the names of
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* its contributors may be used to endorse or promote products
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* derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _LINUX_SUNRPC_RPC_RDMA_H
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#define _LINUX_SUNRPC_RPC_RDMA_H
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struct rpcrdma_segment {
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__be32 rs_handle; /* Registered memory handle */
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__be32 rs_length; /* Length of the chunk in bytes */
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__be64 rs_offset; /* Chunk virtual address or offset */
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};
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/*
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* read chunk(s), encoded as a linked list.
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*/
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struct rpcrdma_read_chunk {
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__be32 rc_discrim; /* 1 indicates presence */
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__be32 rc_position; /* Position in XDR stream */
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struct rpcrdma_segment rc_target;
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};
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/*
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* write chunk, and reply chunk.
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*/
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struct rpcrdma_write_chunk {
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struct rpcrdma_segment wc_target;
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};
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/*
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* write chunk(s), encoded as a counted array.
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*/
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struct rpcrdma_write_array {
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__be32 wc_discrim; /* 1 indicates presence */
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__be32 wc_nchunks; /* Array count */
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struct rpcrdma_write_chunk wc_array[0];
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};
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struct rpcrdma_msg {
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__be32 rm_xid; /* Mirrors the RPC header xid */
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__be32 rm_vers; /* Version of this protocol */
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__be32 rm_credit; /* Buffers requested/granted */
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__be32 rm_type; /* Type of message (enum rpcrdma_proc) */
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union {
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struct { /* no chunks */
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__be32 rm_empty[3]; /* 3 empty chunk lists */
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} rm_nochunks;
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struct { /* no chunks and padded */
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__be32 rm_align; /* Padding alignment */
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__be32 rm_thresh; /* Padding threshold */
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__be32 rm_pempty[3]; /* 3 empty chunk lists */
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} rm_padded;
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__be32 rm_chunks[0]; /* read, write and reply chunks */
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} rm_body;
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};
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#define RPCRDMA_HDRLEN_MIN 28
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enum rpcrdma_errcode {
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ERR_VERS = 1,
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ERR_CHUNK = 2
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};
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struct rpcrdma_err_vers {
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uint32_t rdma_vers_low; /* Version range supported by peer */
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uint32_t rdma_vers_high;
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};
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enum rpcrdma_proc {
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RDMA_MSG = 0, /* An RPC call or reply msg */
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RDMA_NOMSG = 1, /* An RPC call or reply msg - separate body */
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RDMA_MSGP = 2, /* An RPC call or reply msg with padding */
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RDMA_DONE = 3, /* Client signals reply completion */
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RDMA_ERROR = 4 /* An RPC RDMA encoding error */
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};
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#endif /* _LINUX_SUNRPC_RPC_RDMA_H */
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