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  * RPC transport identifier for RDMA
  45  */
  46 #define XPRT_TRANSPORT_RDMA     256
  47
  48 /*
  49  * rpcbind (v3+) RDMA netid.
  50  */
  51 #define RPCBIND_NETID_RDMA      "rdma"
  52
  53 /*
  54  * Constants. Max RPC/NFS header is big enough to account for
  55  * additional marshaling buffers passed down by Linux client.
  56  *
  57  * RDMA header is currently fixed max size, and is big enough for a
  58  * fully-chunked NFS message (read chunks are the largest). Note only
  59  * a single chunk type per message is supported currently.
  60  */
  61 #define RPCRDMA_MIN_SLOT_TABLE  (2U)
  62 #define RPCRDMA_DEF_SLOT_TABLE  (32U)
  63 #define RPCRDMA_MAX_SLOT_TABLE  (256U)
  64
  65 #define RPCRDMA_DEF_INLINE  (1024)      /* default inline max */
  66
  67 #define RPCRDMA_INLINE_PAD_THRESH  (512)/* payload threshold to pad (bytes) */
  68
  69 #define RDMA_RESOLVE_TIMEOUT    (5*HZ)  /* TBD 5 seconds */
  70 #define RDMA_CONNECT_RETRY_MAX  (2)     /* retries if no listener backlog */
  71
  72 /* memory registration strategies */
  73 #define RPCRDMA_PERSISTENT_REGISTRATION (1)
  74
  75 enum rpcrdma_memreg {
  76         RPCRDMA_BOUNCEBUFFERS = 0,
  77         RPCRDMA_REGISTER,
  78         RPCRDMA_MEMWINDOWS,
  79         RPCRDMA_MEMWINDOWS_ASYNC,
  80         RPCRDMA_MTHCAFMR,
  81         RPCRDMA_ALLPHYSICAL,
  82         RPCRDMA_LAST
  83 };
  84
  85 #endif /* _LINUX_SUNRPC_XPRTRDMA_H */