mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
201 lines
6.1 KiB
C
201 lines
6.1 KiB
C
/* 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 */
|