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 #include <linux/types.h> 44 45 struct rpcrdma_segment { 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 */ 49 }; 50 51 /* 52 * read chunk(s), encoded as a linked list. 53 */ 54 struct rpcrdma_read_chunk { 55 __be32 rc_discrim; /* 1 indicates presence */ 56 __be32 rc_position; /* Position in XDR stream */ 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 { 71 __be32 wc_discrim; /* 1 indicates presence */ 72 __be32 wc_nchunks; /* Array count */ 73 struct rpcrdma_write_chunk wc_array[0]; 74 }; 75 76 struct rpcrdma_msg { 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) */ 81 union { 82 83 struct { /* no chunks */ 84 __be32 rm_empty[3]; /* 3 empty chunk lists */ 85 } rm_nochunks; 86 87 struct { /* no chunks and padded */ 88 __be32 rm_align; /* Padding alignment */ 89 __be32 rm_thresh; /* Padding threshold */ 90 __be32 rm_pempty[3]; /* 3 empty chunk lists */ 91 } rm_padded; 92 93 __be32 rm_chunks[0]; /* read, write and reply chunks */ 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 */ 119