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usr
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linux-headers-6.8.0-83
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include
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linux
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sunrpc
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rpc_rdma.h
/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */ /* * Copyright (c) 2015-2017 Oracle. All rights reserved. * 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 #include <linux/types.h> #include <linux/bitops.h> #define RPCRDMA_VERSION 1 #define rpcrdma_version cpu_to_be32(RPCRDMA_VERSION) enum { RPCRDMA_V1_DEF_INLINE_SIZE = 1024, }; /* * XDR sizes, in quads */ enum { rpcrdma_fixed_maxsz = 4, rpcrdma_segment_maxsz = 4, rpcrdma_readseg_maxsz = 1 + rpcrdma_segment_maxsz, rpcrdma_readchunk_maxsz = 1 + rpcrdma_readseg_maxsz, }; /* * Smallest RPC/RDMA header: rm_xid through rm_type, then rm_nochunks */ #define RPCRDMA_HDRLEN_MIN (sizeof(__be32) * 7) #define RPCRDMA_HDRLEN_ERR (sizeof(__be32) * 5) enum rpcrdma_errcode { ERR_VERS = 1, ERR_CHUNK = 2 }; 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 */ }; #define rdma_msg cpu_to_be32(RDMA_MSG) #define rdma_nomsg cpu_to_be32(RDMA_NOMSG) #define rdma_msgp cpu_to_be32(RDMA_MSGP) #define rdma_done cpu_to_be32(RDMA_DONE) #define rdma_error cpu_to_be32(RDMA_ERROR) #define err_vers cpu_to_be32(ERR_VERS) #define err_chunk cpu_to_be32(ERR_CHUNK) /* * Private extension to RPC-over-RDMA Version One. * Message passed during RDMA-CM connection set-up. * * Add new fields at the end, and don't permute existing * fields. */ struct rpcrdma_connect_private { __be32 cp_magic; u8 cp_version; u8 cp_flags; u8 cp_send_size; u8 cp_recv_size; } __packed; #define rpcrdma_cmp_magic __cpu_to_be32(0xf6ab0e18) enum { RPCRDMA_CMP_VERSION = 1, RPCRDMA_CMP_F_SND_W_INV_OK = BIT(0), }; static inline u8 rpcrdma_encode_buffer_size(unsigned int size) { return (size >> 10) - 1; } static inline unsigned int rpcrdma_decode_buffer_size(u8 val) { return ((unsigned int)val + 1) << 10; } /** * xdr_encode_rdma_segment - Encode contents of an RDMA segment * @p: Pointer into a send buffer * @handle: The RDMA handle to encode * @length: The RDMA length to encode * @offset: The RDMA offset to encode * * Return value: * Pointer to the XDR position that follows the encoded RDMA segment */ static inline __be32 *xdr_encode_rdma_segment(__be32 *p, u32 handle, u32 length, u64 offset) { *p++ = cpu_to_be32(handle); *p++ = cpu_to_be32(length); return xdr_encode_hyper(p, offset); } /** * xdr_encode_read_segment - Encode contents of a Read segment * @p: Pointer into a send buffer * @position: The position to encode * @handle: The RDMA handle to encode * @length: The RDMA length to encode * @offset: The RDMA offset to encode * * Return value: * Pointer to the XDR position that follows the encoded Read segment */ static inline __be32 *xdr_encode_read_segment(__be32 *p, u32 position, u32 handle, u32 length, u64 offset) { *p++ = cpu_to_be32(position); return xdr_encode_rdma_segment(p, handle, length, offset); } /** * xdr_decode_rdma_segment - Decode contents of an RDMA segment * @p: Pointer to the undecoded RDMA segment * @handle: Upon return, the RDMA handle * @length: Upon return, the RDMA length * @offset: Upon return, the RDMA offset * * Return value: * Pointer to the XDR item that follows the RDMA segment */ static inline __be32 *xdr_decode_rdma_segment(__be32 *p, u32 *handle, u32 *length, u64 *offset) { *handle = be32_to_cpup(p++); *length = be32_to_cpup(p++); return xdr_decode_hyper(p, offset); } /** * xdr_decode_read_segment - Decode contents of a Read segment * @p: Pointer to the undecoded Read segment * @position: Upon return, the segment's position * @handle: Upon return, the RDMA handle * @length: Upon return, the RDMA length * @offset: Upon return, the RDMA offset * * Return value: * Pointer to the XDR item that follows the Read segment */ static inline __be32 *xdr_decode_read_segment(__be32 *p, u32 *position, u32 *handle, u32 *length, u64 *offset) { *position = be32_to_cpup(p++); return xdr_decode_rdma_segment(p, handle, length, offset); } #endif /* _LINUX_SUNRPC_RPC_RDMA_H */
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