LXR linux/drivers/infiniband/core/smi.h

   1/*
   2 * Copyright (c) 2004 Mellanox Technologies Ltd.  All rights reserved.
   3 * Copyright (c) 2004 Infinicon Corporation.  All rights reserved.
   4 * Copyright (c) 2004 Intel Corporation.  All rights reserved.
   5 * Copyright (c) 2004 Topspin Corporation.  All rights reserved.
   6 * Copyright (c) 2004-2007 Voltaire Corporation.  All rights reserved.
   7 *
   8 * This software is available to you under a choice of one of two
   9 * licenses.  You may choose to be licensed under the terms of the GNU
  10 * General Public License (GPL) Version 2, available from the file
  11 * COPYING in the main directory of this source tree, or the
  12 * OpenIB.org BSD license below:
  13 *
  14 *     Redistribution and use in source and binary forms, with or
  15 *     without modification, are permitted provided that the following
  16 *     conditions are met:
  17 *
  18 *      - Redistributions of source code must retain the above
  19 *        copyright notice, this list of conditions and the following
  20 *        disclaimer.
  21 *
  22 *      - Redistributions in binary form must reproduce the above
  23 *        copyright notice, this list of conditions and the following
  24 *        disclaimer in the documentation and/or other materials
  25 *        provided with the distribution.
  26 *
  27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  28 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  29 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  30 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  31 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  32 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  33 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  34 * SOFTWARE.
  35 *
  36 */
  37
  38#ifndef __SMI_H_
  39#define __SMI_H_
  40
  41#include <rdma/ib_smi.h>
  42
  43enum smi_action {
  44        IB_SMI_DISCARD,
  45        IB_SMI_HANDLE
  46};
  47
  48enum smi_forward_action {
  49        IB_SMI_LOCAL,   /* SMP should be completed up the stack */
  50        IB_SMI_SEND,    /* received DR SMP should be forwarded to the send queue */
  51        IB_SMI_FORWARD  /* SMP should be forwarded (for switches only) */
  52};
  53
  54enum smi_action smi_handle_dr_smp_recv(struct ib_smp *smp, u8 node_type,
  55                                       int port_num, int phys_port_cnt);
  56int smi_get_fwd_port(struct ib_smp *smp);
  57extern enum smi_forward_action smi_check_forward_dr_smp(struct ib_smp *smp);
  58extern enum smi_action smi_handle_dr_smp_send(struct ib_smp *smp,
  59                                              u8 node_type, int port_num);
  60
  61/*
  62 * Return IB_SMI_HANDLE if the SMP should be handled by the local SMA/SM
  63 * via process_mad
  64 */
  65static inline enum smi_action smi_check_local_smp(struct ib_smp *smp,
  66                                                  struct ib_device *device)
  67{
  68        /* C14-9:3 -- We're at the end of the DR segment of path */
  69        /* C14-9:4 -- Hop Pointer = Hop Count + 1 -> give to SMA/SM */
  70        return ((device->process_mad &&
  71                !ib_get_smp_direction(smp) &&
  72                (smp->hop_ptr == smp->hop_cnt + 1)) ?
  73                IB_SMI_HANDLE : IB_SMI_DISCARD);
  74}
  75
  76/*
  77 * Return IB_SMI_HANDLE if the SMP should be handled by the local SMA/SM
  78 * via process_mad
  79 */
  80static inline enum smi_action smi_check_local_returning_smp(struct ib_smp *smp,
  81                                                   struct ib_device *device)
  82{
  83        /* C14-13:3 -- We're at the end of the DR segment of path */
  84        /* C14-13:4 -- Hop Pointer == 0 -> give to SM */
  85        return ((device->process_mad &&
  86                ib_get_smp_direction(smp) &&
  87                !smp->hop_ptr) ? IB_SMI_HANDLE : IB_SMI_DISCARD);
  88}
  89
  90#endif  /* __SMI_H_ */
  91