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
  43 enum smi_action {
  44         IB_SMI_DISCARD,
  45         IB_SMI_HANDLE
  46 };
  47
  48 enum 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
  54 enum smi_action smi_handle_dr_smp_recv(struct ib_smp *smp, bool is_switch,
  55                                        int port_num, int phys_port_cnt);
  56 int smi_get_fwd_port(struct ib_smp *smp);
  57 extern enum smi_forward_action smi_check_forward_dr_smp(struct ib_smp *smp);
  58 extern enum smi_action smi_handle_dr_smp_send(struct ib_smp *smp,
  59                                               bool is_switch, 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  */
  65 static 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  */
  80 static 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_ */