/* 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.
*
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* 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
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#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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