LXR linux/include/linux/sunrpc/xprtrdma.h

   1/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
   2/*
   3 * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
   4 *
   5 * This software is available to you under a choice of one of two
   6 * licenses.  You may choose to be licensed under the terms of the GNU
   7 * General Public License (GPL) Version 2, available from the file
   8 * COPYING in the main directory of this source tree, or the BSD-type
   9 * license below:
  10 *
  11 * Redistribution and use in source and binary forms, with or without
  12 * modification, are permitted provided that the following conditions
  13 * are met:
  14 *
  15 *      Redistributions of source code must retain the above copyright
  16 *      notice, this list of conditions and the following disclaimer.
  17 *
  18 *      Redistributions in binary form must reproduce the above
  19 *      copyright notice, this list of conditions and the following
  20 *      disclaimer in the documentation and/or other materials provided
  21 *      with the distribution.
  22 *
  23 *      Neither the name of the Network Appliance, Inc. nor the names of
  24 *      its contributors may be used to endorse or promote products
  25 *      derived from this software without specific prior written
  26 *      permission.
  27 *
  28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  39 */
  40
  41#ifndef _LINUX_SUNRPC_XPRTRDMA_H
  42#define _LINUX_SUNRPC_XPRTRDMA_H
  43
  44/*
  45 * Constants. Max RPC/NFS header is big enough to account for
  46 * additional marshaling buffers passed down by Linux client.
  47 *
  48 * RDMA header is currently fixed max size, and is big enough for a
  49 * fully-chunked NFS message (read chunks are the largest). Note only
  50 * a single chunk type per message is supported currently.
  51 */
  52#define RPCRDMA_MIN_SLOT_TABLE  (2U)
  53#define RPCRDMA_DEF_SLOT_TABLE  (128U)
  54#define RPCRDMA_MAX_SLOT_TABLE  (256U)
  55
  56#define RPCRDMA_MIN_INLINE  (1024)      /* min inline thresh */
  57#define RPCRDMA_DEF_INLINE  (4096)      /* default inline thresh */
  58#define RPCRDMA_MAX_INLINE  (65536)     /* max inline thresh */
  59
  60/* Memory registration strategies, by number.
  61 * This is part of a kernel / user space API. Do not remove. */
  62enum rpcrdma_memreg {
  63        RPCRDMA_BOUNCEBUFFERS = 0,
  64        RPCRDMA_REGISTER,
  65        RPCRDMA_MEMWINDOWS,
  66        RPCRDMA_MEMWINDOWS_ASYNC,
  67        RPCRDMA_MTHCAFMR,
  68        RPCRDMA_FRWR,
  69        RPCRDMA_ALLPHYSICAL,
  70        RPCRDMA_LAST
  71};
  72
  73#endif /* _LINUX_SUNRPC_XPRTRDMA_H */
  74