184 lines
5.1 KiB
C
184 lines
5.1 KiB
C
/*
|
|
* 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,
|
|
};
|
|
|
|
struct rpcrdma_segment {
|
|
__be32 rs_handle; /* Registered memory handle */
|
|
__be32 rs_length; /* Length of the chunk in bytes */
|
|
__be64 rs_offset; /* Chunk virtual address or offset */
|
|
};
|
|
|
|
/*
|
|
* read chunk(s), encoded as a linked list.
|
|
*/
|
|
struct rpcrdma_read_chunk {
|
|
__be32 rc_discrim; /* 1 indicates presence */
|
|
__be32 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 {
|
|
__be32 wc_discrim; /* 1 indicates presence */
|
|
__be32 wc_nchunks; /* Array count */
|
|
struct rpcrdma_write_chunk wc_array[0];
|
|
};
|
|
|
|
struct rpcrdma_msg {
|
|
__be32 rm_xid; /* Mirrors the RPC header xid */
|
|
__be32 rm_vers; /* Version of this protocol */
|
|
__be32 rm_credit; /* Buffers requested/granted */
|
|
__be32 rm_type; /* Type of message (enum rpcrdma_proc) */
|
|
union {
|
|
|
|
struct { /* no chunks */
|
|
__be32 rm_empty[3]; /* 3 empty chunk lists */
|
|
} rm_nochunks;
|
|
|
|
struct { /* no chunks and padded */
|
|
__be32 rm_align; /* Padding alignment */
|
|
__be32 rm_thresh; /* Padding threshold */
|
|
__be32 rm_pempty[3]; /* 3 empty chunk lists */
|
|
} rm_padded;
|
|
|
|
struct {
|
|
__be32 rm_err;
|
|
__be32 rm_vers_low;
|
|
__be32 rm_vers_high;
|
|
} rm_error;
|
|
|
|
__be32 rm_chunks[0]; /* read, write and reply chunks */
|
|
|
|
} rm_body;
|
|
};
|
|
|
|
/*
|
|
* XDR sizes, in quads
|
|
*/
|
|
enum {
|
|
rpcrdma_fixed_maxsz = 4,
|
|
rpcrdma_segment_maxsz = 4,
|
|
rpcrdma_readchunk_maxsz = 2 + rpcrdma_segment_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;
|
|
}
|
|
|
|
#endif /* _LINUX_SUNRPC_RPC_RDMA_H */
|