forked from mirrors/linux
201 lines
6.1 KiB
C
201 lines
6.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
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/*
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* Copyright (c) 2015-2017 Oracle. All rights reserved.
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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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#include <linux/types.h>
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#include <linux/bitops.h>
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#define RPCRDMA_VERSION 1
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#define rpcrdma_version cpu_to_be32(RPCRDMA_VERSION)
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enum {
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RPCRDMA_V1_DEF_INLINE_SIZE = 1024,
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};
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/*
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* XDR sizes, in quads
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*/
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enum {
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rpcrdma_fixed_maxsz = 4,
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rpcrdma_segment_maxsz = 4,
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rpcrdma_readseg_maxsz = 1 + rpcrdma_segment_maxsz,
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rpcrdma_readchunk_maxsz = 1 + rpcrdma_readseg_maxsz,
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};
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/*
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* Smallest RPC/RDMA header: rm_xid through rm_type, then rm_nochunks
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*/
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#define RPCRDMA_HDRLEN_MIN (sizeof(__be32) * 7)
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#define RPCRDMA_HDRLEN_ERR (sizeof(__be32) * 5)
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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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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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#define rdma_msg cpu_to_be32(RDMA_MSG)
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#define rdma_nomsg cpu_to_be32(RDMA_NOMSG)
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#define rdma_msgp cpu_to_be32(RDMA_MSGP)
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#define rdma_done cpu_to_be32(RDMA_DONE)
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#define rdma_error cpu_to_be32(RDMA_ERROR)
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#define err_vers cpu_to_be32(ERR_VERS)
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#define err_chunk cpu_to_be32(ERR_CHUNK)
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/*
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* Private extension to RPC-over-RDMA Version One.
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* Message passed during RDMA-CM connection set-up.
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*
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* Add new fields at the end, and don't permute existing
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* fields.
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*/
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struct rpcrdma_connect_private {
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__be32 cp_magic;
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u8 cp_version;
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u8 cp_flags;
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u8 cp_send_size;
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u8 cp_recv_size;
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} __packed;
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#define rpcrdma_cmp_magic __cpu_to_be32(0xf6ab0e18)
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enum {
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RPCRDMA_CMP_VERSION = 1,
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RPCRDMA_CMP_F_SND_W_INV_OK = BIT(0),
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};
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static inline u8
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rpcrdma_encode_buffer_size(unsigned int size)
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{
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return (size >> 10) - 1;
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}
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static inline unsigned int
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rpcrdma_decode_buffer_size(u8 val)
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{
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return ((unsigned int)val + 1) << 10;
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}
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/**
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* xdr_encode_rdma_segment - Encode contents of an RDMA segment
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* @p: Pointer into a send buffer
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* @handle: The RDMA handle to encode
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* @length: The RDMA length to encode
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* @offset: The RDMA offset to encode
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*
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* Return value:
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* Pointer to the XDR position that follows the encoded RDMA segment
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*/
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static inline __be32 *xdr_encode_rdma_segment(__be32 *p, u32 handle,
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u32 length, u64 offset)
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{
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*p++ = cpu_to_be32(handle);
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*p++ = cpu_to_be32(length);
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return xdr_encode_hyper(p, offset);
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}
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/**
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* xdr_encode_read_segment - Encode contents of a Read segment
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* @p: Pointer into a send buffer
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* @position: The position to encode
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* @handle: The RDMA handle to encode
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* @length: The RDMA length to encode
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* @offset: The RDMA offset to encode
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*
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* Return value:
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* Pointer to the XDR position that follows the encoded Read segment
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*/
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static inline __be32 *xdr_encode_read_segment(__be32 *p, u32 position,
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u32 handle, u32 length,
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u64 offset)
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{
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*p++ = cpu_to_be32(position);
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return xdr_encode_rdma_segment(p, handle, length, offset);
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}
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/**
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* xdr_decode_rdma_segment - Decode contents of an RDMA segment
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* @p: Pointer to the undecoded RDMA segment
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* @handle: Upon return, the RDMA handle
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* @length: Upon return, the RDMA length
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* @offset: Upon return, the RDMA offset
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*
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* Return value:
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* Pointer to the XDR item that follows the RDMA segment
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*/
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static inline __be32 *xdr_decode_rdma_segment(__be32 *p, u32 *handle,
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u32 *length, u64 *offset)
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{
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*handle = be32_to_cpup(p++);
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*length = be32_to_cpup(p++);
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return xdr_decode_hyper(p, offset);
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}
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/**
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* xdr_decode_read_segment - Decode contents of a Read segment
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* @p: Pointer to the undecoded Read segment
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* @position: Upon return, the segment's position
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* @handle: Upon return, the RDMA handle
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* @length: Upon return, the RDMA length
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* @offset: Upon return, the RDMA offset
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*
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* Return value:
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* Pointer to the XDR item that follows the Read segment
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*/
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static inline __be32 *xdr_decode_read_segment(__be32 *p, u32 *position,
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u32 *handle, u32 *length,
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u64 *offset)
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{
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*position = be32_to_cpup(p++);
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return xdr_decode_rdma_segment(p, handle, length, offset);
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}
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#endif /* _LINUX_SUNRPC_RPC_RDMA_H */
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