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

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