src/net/infiniband/ib_smc.c

   1 /*
   2  * Copyright (C) 2008 Michael Brown <mbrown@fensystems.co.uk>.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation; either version 2 of the
   7  * License, or any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17  */
  18
  19 FILE_LICENCE ( GPL2_OR_LATER );
  20
  21 #include <stdint.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <errno.h>
  25 #include <unistd.h>
  26 #include <byteswap.h>
  27 #include <gpxe/infiniband.h>
  28 #include <gpxe/ib_smc.h>
  29
  30 /**
  31  * @file
  32  *
  33  * Infiniband Subnet Management Client
  34  *
  35  */
  36
  37 /**
  38  * Get port information
  39  *
  40  * @v ibdev             Infiniband device
  41  * @v local_mad         Method for issuing local MADs
  42  * @v mad               Management datagram to fill in
  43  * @ret rc              Return status code
  44  */
  45 static int ib_smc_get_port_info ( struct ib_device *ibdev,
  46                                   ib_local_mad_t local_mad,
  47                                   union ib_mad *mad ) {
  48         int rc;
  49
  50         /* Construct MAD */
  51         memset ( mad, 0, sizeof ( *mad ) );
  52         mad->hdr.base_version = IB_MGMT_BASE_VERSION;
  53         mad->hdr.mgmt_class = IB_MGMT_CLASS_SUBN_LID_ROUTED;
  54         mad->hdr.class_version = 1;
  55         mad->hdr.method = IB_MGMT_METHOD_GET;
  56         mad->hdr.attr_id = htons ( IB_SMP_ATTR_PORT_INFO );
  57         mad->hdr.attr_mod = htonl ( ibdev->port );
  58
  59         if ( ( rc = local_mad ( ibdev, mad ) ) != 0 ) {
  60                 DBGC ( ibdev, "IBDEV %p could not get port info: %s\n",
  61                        ibdev, strerror ( rc ) );
  62                 return rc;
  63         }
  64         return 0;
  65 }
  66
  67 /**
  68  * Get GUID information
  69  *
  70  * @v ibdev             Infiniband device
  71  * @v local_mad         Method for issuing local MADs
  72  * @v mad               Management datagram to fill in
  73  * @ret rc              Return status code
  74  */
  75 static int ib_smc_get_guid_info ( struct ib_device *ibdev,
  76                                   ib_local_mad_t local_mad,
  77                                   union ib_mad *mad ) {
  78         int rc;
  79
  80         /* Construct MAD */
  81         memset ( mad, 0, sizeof ( *mad ) );
  82         mad->hdr.base_version = IB_MGMT_BASE_VERSION;
  83         mad->hdr.mgmt_class = IB_MGMT_CLASS_SUBN_LID_ROUTED;
  84         mad->hdr.class_version = 1;
  85         mad->hdr.method = IB_MGMT_METHOD_GET;
  86         mad->hdr.attr_id = htons ( IB_SMP_ATTR_GUID_INFO );
  87
  88         if ( ( rc = local_mad ( ibdev, mad ) ) != 0 ) {
  89                 DBGC ( ibdev, "IBDEV %p could not get GUID info: %s\n",
  90                        ibdev, strerror ( rc ) );
  91                 return rc;
  92         }
  93         return 0;
  94 }
  95
  96 /**
  97  * Get partition key table
  98  *
  99  * @v ibdev             Infiniband device
 100  * @v local_mad         Method for issuing local MADs
 101  * @v mad               Management datagram to fill in
 102  * @ret rc              Return status code
 103  */
 104 static int ib_smc_get_pkey_table ( struct ib_device *ibdev,
 105                                    ib_local_mad_t local_mad,
 106                                    union ib_mad *mad ) {
 107         int rc;
 108
 109         /* Construct MAD */
 110         memset ( mad, 0, sizeof ( *mad ) );
 111         mad->hdr.base_version = IB_MGMT_BASE_VERSION;
 112         mad->hdr.mgmt_class = IB_MGMT_CLASS_SUBN_LID_ROUTED;
 113         mad->hdr.class_version = 1;
 114         mad->hdr.method = IB_MGMT_METHOD_GET;
 115         mad->hdr.attr_id = htons ( IB_SMP_ATTR_PKEY_TABLE );
 116
 117         if ( ( rc = local_mad ( ibdev, mad ) ) != 0 ) {
 118                 DBGC ( ibdev, "IBDEV %p could not get pkey table: %s\n",
 119                        ibdev, strerror ( rc ) );
 120                 return rc;
 121         }
 122         return 0;
 123 }
 124
 125 /**
 126  * Get MAD parameters
 127  *
 128  * @v ibdev             Infiniband device
 129  * @v local_mad         Method for issuing local MADs
 130  * @ret rc              Return status code
 131  */
 132 int ib_smc_update ( struct ib_device *ibdev, ib_local_mad_t local_mad ) {
 133         union ib_mad mad;
 134         struct ib_port_info *port_info = &mad.smp.smp_data.port_info;
 135         struct ib_guid_info *guid_info = &mad.smp.smp_data.guid_info;
 136         struct ib_pkey_table *pkey_table = &mad.smp.smp_data.pkey_table;
 137         int rc;
 138
 139         /* Port info gives us the link state, the first half of the
 140          * port GID and the SM LID.
 141          */
 142         if ( ( rc = ib_smc_get_port_info ( ibdev, local_mad, &mad ) ) != 0 )
 143                 return rc;
 144         memcpy ( &ibdev->gid.u.half[0], port_info->gid_prefix,
 145                  sizeof ( ibdev->gid.u.half[0] ) );
 146         ibdev->lid = ntohs ( port_info->lid );
 147         ibdev->sm_lid = ntohs ( port_info->mastersm_lid );
 148         ibdev->link_width_enabled = port_info->link_width_enabled;
 149         ibdev->link_width_supported = port_info->link_width_supported;
 150         ibdev->link_width_active = port_info->link_width_active;
 151         ibdev->link_speed_supported =
 152                 ( port_info->link_speed_supported__port_state >> 4 );
 153         ibdev->port_state =
 154                 ( port_info->link_speed_supported__port_state & 0xf );
 155         ibdev->link_speed_active =
 156                 ( port_info->link_speed_active__link_speed_enabled >> 4 );
 157         ibdev->link_speed_enabled =
 158                 ( port_info->link_speed_active__link_speed_enabled & 0xf );
 159         ibdev->sm_sl = ( port_info->neighbour_mtu__mastersm_sl & 0xf );
 160
 161         /* GUID info gives us the second half of the port GID */
 162         if ( ( rc = ib_smc_get_guid_info ( ibdev, local_mad, &mad ) ) != 0 )
 163                 return rc;
 164         memcpy ( &ibdev->gid.u.half[1], guid_info->guid[0],
 165                  sizeof ( ibdev->gid.u.half[1] ) );
 166
 167         /* Get partition key */
 168         if ( ( rc = ib_smc_get_pkey_table ( ibdev, local_mad, &mad ) ) != 0 )
 169                 return rc;
 170         ibdev->pkey = ntohs ( pkey_table->pkey[0] );
 171
 172         DBGC ( ibdev, "IBDEV %p port GID is %08x:%08x:%08x:%08x\n", ibdev,
 173                htonl ( ibdev->gid.u.dwords[0] ),
 174                htonl ( ibdev->gid.u.dwords[1] ),
 175                htonl ( ibdev->gid.u.dwords[2] ),
 176                htonl ( ibdev->gid.u.dwords[3] ) );
 177
 178         return 0;
 179 }