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 43 struct rpcrdma_segment { 44 __be32 rs_handle; /* Registered memory handle */ 45 __be32 rs_length; /* Length of the chunk in bytes */ 46 __be64 rs_offset; /* Chunk virtual address or offset */ 47 }; 48 49 /* 50 * read chunk(s), encoded as a linked list. 51 */ 52 struct rpcrdma_read_chunk { 53 __be32 rc_discrim; /* 1 indicates presence */ 54 __be32 rc_position; /* Position in XDR stream */ 55 struct rpcrdma_segment rc_target; 56 }; 57 58 /* 59 * write chunk, and reply chunk. 60 */ 61 struct rpcrdma_write_chunk { 62 struct rpcrdma_segment wc_target; 63 }; 64 65 /* 66 * write chunk(s), encoded as a counted array. 67 */ 68 struct rpcrdma_write_array { 69 __be32 wc_discrim; /* 1 indicates presence */ 70 __be32 wc_nchunks; /* Array count */ 71 struct rpcrdma_write_chunk wc_array[0]; 72 }; 73 74 struct rpcrdma_msg { 75 __be32 rm_xid; /* Mirrors the RPC header xid */ 76 __be32 rm_vers; /* Version of this protocol */ 77 __be32 rm_credit; /* Buffers requested/granted */ 78 __be32 rm_type; /* Type of message (enum rpcrdma_proc) */ 79 union { 80 81 struct { /* no chunks */ 82 __be32 rm_empty[3]; /* 3 empty chunk lists */ 83 } rm_nochunks; 84 85 struct { /* no chunks and padded */ 86 __be32 rm_align; /* Padding alignment */ 87 __be32 rm_thresh; /* Padding threshold */ 88 __be32 rm_pempty[3]; /* 3 empty chunk lists */ 89 } rm_padded; 90 91 __be32 rm_chunks[0]; /* read, write and reply chunks */ 92 93 } rm_body; 94 }; 95 96 #define RPCRDMA_HDRLEN_MIN 28 97 98 enum rpcrdma_errcode { 99 ERR_VERS = 1, 100 ERR_CHUNK = 2 101 }; 102 103 struct rpcrdma_err_vers { 104 uint32_t rdma_vers_low; /* Version range supported by peer */ 105 uint32_t rdma_vers_high; 106 }; 107 108 enum rpcrdma_proc { 109 RDMA_MSG = 0, /* An RPC call or reply msg */ 110 RDMA_NOMSG = 1, /* An RPC call or reply msg - separate body */ 111 RDMA_MSGP = 2, /* An RPC call or reply msg with padding */ 112 RDMA_DONE = 3, /* Client signals reply completion */ 113 RDMA_ERROR = 4 /* An RPC RDMA encoding error */ 114 }; 115 116 #endif /* _LINUX_SUNRPC_RPC_RDMA_H */ 117