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Diffstat (limited to 'include/linux/sunrpc/rpc_rdma.h')
| -rw-r--r-- | include/linux/sunrpc/rpc_rdma.h | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/include/linux/sunrpc/rpc_rdma.h b/include/linux/sunrpc/rpc_rdma.h new file mode 100644 index 000000000000..0013a0d8dc6b --- /dev/null +++ b/include/linux/sunrpc/rpc_rdma.h @@ -0,0 +1,116 @@ +/* + * 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 */ |