drivers/infiniband/core/smi.c

   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 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  * $Id: smi.c 1389 2004-12-27 22:56:47Z roland $
  37  */
  38
  39 #include <ib_smi.h>
  40 #include "smi.h"
  41
  42 /*
  43  * Fixup a directed route SMP for sending
  44  * Return 0 if the SMP should be discarded
  45  */
  46 int smi_handle_dr_smp_send(struct ib_smp *smp,
  47                            u8 node_type,
  48                            int port_num)
  49 {
  50         u8 hop_ptr, hop_cnt;
  51
  52         hop_ptr = smp->hop_ptr;
  53         hop_cnt = smp->hop_cnt;
  54
  55         /* See section 14.2.2.2, Vol 1 IB spec */
  56         if (!ib_get_smp_direction(smp)) {
  57                 /* C14-9:1 */
  58                 if (hop_cnt && hop_ptr == 0) {
  59                         smp->hop_ptr++;
  60                         return (smp->initial_path[smp->hop_ptr] ==
  61                                 port_num);
  62                 }
  63
  64                 /* C14-9:2 */
  65                 if (hop_ptr && hop_ptr < hop_cnt) {
  66                         if (node_type != IB_NODE_SWITCH)
  67                                 return 0;
  68
  69                         /* smp->return_path set when received */
  70                         smp->hop_ptr++;
  71                         return (smp->initial_path[smp->hop_ptr] ==
  72                                 port_num);
  73                 }
  74
  75                 /* C14-9:3 -- We're at the end of the DR segment of path */
  76                 if (hop_ptr == hop_cnt) {
  77                         /* smp->return_path set when received */
  78                         smp->hop_ptr++;
  79                         return (node_type == IB_NODE_SWITCH ||
  80                                 smp->dr_dlid == IB_LID_PERMISSIVE);
  81                 }
  82
  83                 /* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */
  84                 /* C14-9:5 -- Fail unreasonable hop pointer */
  85                 return (hop_ptr == hop_cnt + 1);
  86
  87         } else {
  88                 /* C14-13:1 */
  89                 if (hop_cnt && hop_ptr == hop_cnt + 1) {
  90                         smp->hop_ptr--;
  91                         return (smp->return_path[smp->hop_ptr] ==
  92                                 port_num);
  93                 }
  94
  95                 /* C14-13:2 */
  96                 if (2 <= hop_ptr && hop_ptr <= hop_cnt) {
  97                         if (node_type != IB_NODE_SWITCH)
  98                                 return 0;
  99
 100                         smp->hop_ptr--;
 101                         return (smp->return_path[smp->hop_ptr] ==
 102                                 port_num);
 103                 }
 104
 105                 /* C14-13:3 -- at the end of the DR segment of path */
 106                 if (hop_ptr == 1) {
 107                         smp->hop_ptr--;
 108                         /* C14-13:3 -- SMPs destined for SM shouldn't be here */
 109                         return (node_type == IB_NODE_SWITCH ||
 110                                 smp->dr_slid == IB_LID_PERMISSIVE);
 111                 }
 112
 113                 /* C14-13:4 -- hop_ptr = 0 -> should have gone to SM */
 114                 if (hop_ptr == 0)
 115                         return 1;
 116
 117                 /* C14-13:5 -- Check for unreasonable hop pointer */
 118                 return 0;
 119         }
 120 }
 121
 122 /*
 123  * Adjust information for a received SMP
 124  * Return 0 if the SMP should be dropped
 125  */
 126 int smi_handle_dr_smp_recv(struct ib_smp *smp,
 127                            u8 node_type,
 128                            int port_num,
 129                            int phys_port_cnt)
 130 {
 131         u8 hop_ptr, hop_cnt;
 132
 133         hop_ptr = smp->hop_ptr;
 134         hop_cnt = smp->hop_cnt;
 135
 136         /* See section 14.2.2.2, Vol 1 IB spec */
 137         if (!ib_get_smp_direction(smp)) {
 138                 /* C14-9:1 -- sender should have incremented hop_ptr */
 139                 if (hop_cnt && hop_ptr == 0)
 140                         return 0;
 141
 142                 /* C14-9:2 -- intermediate hop */
 143                 if (hop_ptr && hop_ptr < hop_cnt) {
 144                         if (node_type != IB_NODE_SWITCH)
 145                                 return 0;
 146
 147                         smp->return_path[hop_ptr] = port_num;
 148                         /* smp->hop_ptr updated when sending */
 149                         return (smp->initial_path[hop_ptr+1] <= phys_port_cnt);
 150                 }
 151
 152                 /* C14-9:3 -- We're at the end of the DR segment of path */
 153                 if (hop_ptr == hop_cnt) {
 154                         if (hop_cnt)
 155                                 smp->return_path[hop_ptr] = port_num;
 156                         /* smp->hop_ptr updated when sending */
 157
 158                         return (node_type == IB_NODE_SWITCH ||
 159                                 smp->dr_dlid == IB_LID_PERMISSIVE);
 160                 }
 161
 162                 /* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */
 163                 /* C14-9:5 -- fail unreasonable hop pointer */
 164                 return (hop_ptr == hop_cnt + 1);
 165
 166         } else {
 167
 168                 /* C14-13:1 */
 169                 if (hop_cnt && hop_ptr == hop_cnt + 1) {
 170                         smp->hop_ptr--;
 171                         return (smp->return_path[smp->hop_ptr] ==
 172                                 port_num);
 173                 }
 174
 175                 /* C14-13:2 */
 176                 if (2 <= hop_ptr && hop_ptr <= hop_cnt) {
 177                         if (node_type != IB_NODE_SWITCH)
 178                                 return 0;
 179
 180                         /* smp->hop_ptr updated when sending */
 181                         return (smp->return_path[hop_ptr-1] <= phys_port_cnt);
 182                 }
 183
 184                 /* C14-13:3 -- We're at the end of the DR segment of path */
 185                 if (hop_ptr == 1) {
 186                         if (smp->dr_slid == IB_LID_PERMISSIVE) {
 187                                 /* giving SMP to SM - update hop_ptr */
 188                                 smp->hop_ptr--;
 189                                 return 1;
 190                         }
 191                         /* smp->hop_ptr updated when sending */
 192                         return (node_type == IB_NODE_SWITCH);
 193                 }
 194
 195                 /* C14-13:4 -- hop_ptr = 0 -> give to SM */
 196                 /* C14-13:5 -- Check for unreasonable hop pointer */
 197                 return (hop_ptr == 0);
 198         }
 199 }
 200
 201 /*
 202  * Return 1 if the received DR SMP should be forwarded to the send queue
 203  * Return 0 if the SMP should be completed up the stack
 204  */
 205 int smi_check_forward_dr_smp(struct ib_smp *smp)
 206 {
 207         u8 hop_ptr, hop_cnt;
 208
 209         hop_ptr = smp->hop_ptr;
 210         hop_cnt = smp->hop_cnt;
 211
 212         if (!ib_get_smp_direction(smp)) {
 213                 /* C14-9:2 -- intermediate hop */
 214                 if (hop_ptr && hop_ptr < hop_cnt)
 215                         return 1;
 216
 217                 /* C14-9:3 -- at the end of the DR segment of path */
 218                 if (hop_ptr == hop_cnt)
 219                         return (smp->dr_dlid == IB_LID_PERMISSIVE);
 220
 221                 /* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */
 222                 if (hop_ptr == hop_cnt + 1)
 223                         return 1;
 224         } else {
 225                 /* C14-13:2 */
 226                 if (2 <= hop_ptr && hop_ptr <= hop_cnt)
 227                         return 1;
 228
 229                 /* C14-13:3 -- at the end of the DR segment of path */
 230                 if (hop_ptr == 1)
 231                         return (smp->dr_slid != IB_LID_PERMISSIVE);
 232         }
 233         return 0;
 234 }