drivers/infiniband/hw/ehca/ehca_av.c

   1 /*
   2  *  IBM eServer eHCA Infiniband device driver for Linux on POWER
   3  *
   4  *  adress vector functions
   5  *
   6  *  Authors: Hoang-Nam Nguyen <hnguyen@de.ibm.com>
   7  *           Khadija Souissi <souissik@de.ibm.com>
   8  *           Reinhard Ernst <rernst@de.ibm.com>
   9  *           Christoph Raisch <raisch@de.ibm.com>
  10  *
  11  *  Copyright (c) 2005 IBM Corporation
  12  *
  13  *  All rights reserved.
  14  *
  15  *  This source code is distributed under a dual license of GPL v2.0 and OpenIB
  16  *  BSD.
  17  *
  18  * OpenIB BSD License
  19  *
  20  * Redistribution and use in source and binary forms, with or without
  21  * modification, are permitted provided that the following conditions are met:
  22  *
  23  * Redistributions of source code must retain the above copyright notice, this
  24  * list of conditions and the following disclaimer.
  25  *
  26  * Redistributions in binary form must reproduce the above copyright notice,
  27  * this list of conditions and the following disclaimer in the documentation
  28  * and/or other materials
  29  * provided with the distribution.
  30  *
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  32  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  33  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  34  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  35  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  36  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  37  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  38  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  39  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  40  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGE.
  42  */
  43
  44
  45 #include <asm/current.h>
  46
  47 #include "ehca_tools.h"
  48 #include "ehca_iverbs.h"
  49 #include "hcp_if.h"
  50
  51 static struct kmem_cache *av_cache;
  52
  53 struct ib_ah *ehca_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr)
  54 {
  55         int ret;
  56         struct ehca_av *av;
  57         struct ehca_shca *shca = container_of(pd->device, struct ehca_shca,
  58                                               ib_device);
  59
  60         av = kmem_cache_alloc(av_cache, SLAB_KERNEL);
  61         if (!av) {
  62                 ehca_err(pd->device, "Out of memory pd=%p ah_attr=%p",
  63                          pd, ah_attr);
  64                 return ERR_PTR(-ENOMEM);
  65         }
  66
  67         av->av.sl = ah_attr->sl;
  68         av->av.dlid = ah_attr->dlid;
  69         av->av.slid_path_bits = ah_attr->src_path_bits;
  70
  71         if (ehca_static_rate < 0) {
  72                 int ah_mult = ib_rate_to_mult(ah_attr->static_rate);
  73                 int ehca_mult =
  74                         ib_rate_to_mult(shca->sport[ah_attr->port_num].rate );
  75
  76                 if (ah_mult >= ehca_mult)
  77                         av->av.ipd = 0;
  78                 else
  79                         av->av.ipd = (ah_mult > 0) ?
  80                                 ((ehca_mult - 1) / ah_mult) : 0;
  81         } else
  82                 av->av.ipd = ehca_static_rate;
  83
  84         av->av.lnh = ah_attr->ah_flags;
  85         av->av.grh.word_0 = EHCA_BMASK_SET(GRH_IPVERSION_MASK, 6);
  86         av->av.grh.word_0 |= EHCA_BMASK_SET(GRH_TCLASS_MASK,
  87                                             ah_attr->grh.traffic_class);
  88         av->av.grh.word_0 |= EHCA_BMASK_SET(GRH_FLOWLABEL_MASK,
  89                                             ah_attr->grh.flow_label);
  90         av->av.grh.word_0 |= EHCA_BMASK_SET(GRH_HOPLIMIT_MASK,
  91                                             ah_attr->grh.hop_limit);
  92         av->av.grh.word_0 |= EHCA_BMASK_SET(GRH_NEXTHEADER_MASK, 0x1B);
  93         /* set sgid in grh.word_1 */
  94         if (ah_attr->ah_flags & IB_AH_GRH) {
  95                 int rc;
  96                 struct ib_port_attr port_attr;
  97                 union ib_gid gid;
  98                 memset(&port_attr, 0, sizeof(port_attr));
  99                 rc = ehca_query_port(pd->device, ah_attr->port_num,
 100                                      &port_attr);
 101                 if (rc) { /* invalid port number */
 102                         ret = -EINVAL;
 103                         ehca_err(pd->device, "Invalid port number "
 104                                  "ehca_query_port() returned %x "
 105                                  "pd=%p ah_attr=%p", rc, pd, ah_attr);
 106                         goto create_ah_exit1;
 107                 }
 108                 memset(&gid, 0, sizeof(gid));
 109                 rc = ehca_query_gid(pd->device,
 110                                     ah_attr->port_num,
 111                                     ah_attr->grh.sgid_index, &gid);
 112                 if (rc) {
 113                         ret = -EINVAL;
 114                         ehca_err(pd->device, "Failed to retrieve sgid "
 115                                  "ehca_query_gid() returned %x "
 116                                  "pd=%p ah_attr=%p", rc, pd, ah_attr);
 117                         goto create_ah_exit1;
 118                 }
 119                 memcpy(&av->av.grh.word_1, &gid, sizeof(gid));
 120         }
 121         /* for the time being we use a hard coded PMTU of 2048 Bytes */
 122         av->av.pmtu = 4;
 123
 124         /* dgid comes in grh.word_3 */
 125         memcpy(&av->av.grh.word_3, &ah_attr->grh.dgid,
 126                sizeof(ah_attr->grh.dgid));
 127
 128         return &av->ib_ah;
 129
 130 create_ah_exit1:
 131         kmem_cache_free(av_cache, av);
 132
 133         return ERR_PTR(ret);
 134 }
 135
 136 int ehca_modify_ah(struct ib_ah *ah, struct ib_ah_attr *ah_attr)
 137 {
 138         struct ehca_av *av;
 139         struct ehca_ud_av new_ehca_av;
 140         struct ehca_pd *my_pd = container_of(ah->pd, struct ehca_pd, ib_pd);
 141         u32 cur_pid = current->tgid;
 142
 143         if (my_pd->ib_pd.uobject && my_pd->ib_pd.uobject->context &&
 144             my_pd->ownpid != cur_pid) {
 145                 ehca_err(ah->device, "Invalid caller pid=%x ownpid=%x",
 146                          cur_pid, my_pd->ownpid);
 147                 return -EINVAL;
 148         }
 149
 150         memset(&new_ehca_av, 0, sizeof(new_ehca_av));
 151         new_ehca_av.sl = ah_attr->sl;
 152         new_ehca_av.dlid = ah_attr->dlid;
 153         new_ehca_av.slid_path_bits = ah_attr->src_path_bits;
 154         new_ehca_av.ipd = ah_attr->static_rate;
 155         new_ehca_av.lnh = EHCA_BMASK_SET(GRH_FLAG_MASK,
 156                                          (ah_attr->ah_flags & IB_AH_GRH) > 0);
 157         new_ehca_av.grh.word_0 = EHCA_BMASK_SET(GRH_TCLASS_MASK,
 158                                                 ah_attr->grh.traffic_class);
 159         new_ehca_av.grh.word_0 |= EHCA_BMASK_SET(GRH_FLOWLABEL_MASK,
 160                                                  ah_attr->grh.flow_label);
 161         new_ehca_av.grh.word_0 |= EHCA_BMASK_SET(GRH_HOPLIMIT_MASK,
 162                                                  ah_attr->grh.hop_limit);
 163         new_ehca_av.grh.word_0 |= EHCA_BMASK_SET(GRH_NEXTHEADER_MASK, 0x1b);
 164
 165         /* set sgid in grh.word_1 */
 166         if (ah_attr->ah_flags & IB_AH_GRH) {
 167                 int rc;
 168                 struct ib_port_attr port_attr;
 169                 union ib_gid gid;
 170                 memset(&port_attr, 0, sizeof(port_attr));
 171                 rc = ehca_query_port(ah->device, ah_attr->port_num,
 172                                      &port_attr);
 173                 if (rc) { /* invalid port number */
 174                         ehca_err(ah->device, "Invalid port number "
 175                                  "ehca_query_port() returned %x "
 176                                  "ah=%p ah_attr=%p port_num=%x",
 177                                  rc, ah, ah_attr, ah_attr->port_num);
 178                         return -EINVAL;
 179                 }
 180                 memset(&gid, 0, sizeof(gid));
 181                 rc = ehca_query_gid(ah->device,
 182                                     ah_attr->port_num,
 183                                     ah_attr->grh.sgid_index, &gid);
 184                 if (rc) {
 185                         ehca_err(ah->device, "Failed to retrieve sgid "
 186                                  "ehca_query_gid() returned %x "
 187                                  "ah=%p ah_attr=%p port_num=%x "
 188                                  "sgid_index=%x",
 189                                  rc, ah, ah_attr, ah_attr->port_num,
 190                                  ah_attr->grh.sgid_index);
 191                         return -EINVAL;
 192                 }
 193                 memcpy(&new_ehca_av.grh.word_1, &gid, sizeof(gid));
 194         }
 195
 196         new_ehca_av.pmtu = 4; /* see also comment in create_ah() */
 197
 198         memcpy(&new_ehca_av.grh.word_3, &ah_attr->grh.dgid,
 199                sizeof(ah_attr->grh.dgid));
 200
 201         av = container_of(ah, struct ehca_av, ib_ah);
 202         av->av = new_ehca_av;
 203
 204         return 0;
 205 }
 206
 207 int ehca_query_ah(struct ib_ah *ah, struct ib_ah_attr *ah_attr)
 208 {
 209         struct ehca_av *av = container_of(ah, struct ehca_av, ib_ah);
 210         struct ehca_pd *my_pd = container_of(ah->pd, struct ehca_pd, ib_pd);
 211         u32 cur_pid = current->tgid;
 212
 213         if (my_pd->ib_pd.uobject && my_pd->ib_pd.uobject->context &&
 214             my_pd->ownpid != cur_pid) {
 215                 ehca_err(ah->device, "Invalid caller pid=%x ownpid=%x",
 216                          cur_pid, my_pd->ownpid);
 217                 return -EINVAL;
 218         }
 219
 220         memcpy(&ah_attr->grh.dgid, &av->av.grh.word_3,
 221                sizeof(ah_attr->grh.dgid));
 222         ah_attr->sl = av->av.sl;
 223
 224         ah_attr->dlid = av->av.dlid;
 225
 226         ah_attr->src_path_bits = av->av.slid_path_bits;
 227         ah_attr->static_rate = av->av.ipd;
 228         ah_attr->ah_flags = EHCA_BMASK_GET(GRH_FLAG_MASK, av->av.lnh);
 229         ah_attr->grh.traffic_class = EHCA_BMASK_GET(GRH_TCLASS_MASK,
 230                                                     av->av.grh.word_0);
 231         ah_attr->grh.hop_limit = EHCA_BMASK_GET(GRH_HOPLIMIT_MASK,
 232                                                 av->av.grh.word_0);
 233         ah_attr->grh.flow_label = EHCA_BMASK_GET(GRH_FLOWLABEL_MASK,
 234                                                  av->av.grh.word_0);
 235
 236         return 0;
 237 }
 238
 239 int ehca_destroy_ah(struct ib_ah *ah)
 240 {
 241         struct ehca_pd *my_pd = container_of(ah->pd, struct ehca_pd, ib_pd);
 242         u32 cur_pid = current->tgid;
 243
 244         if (my_pd->ib_pd.uobject && my_pd->ib_pd.uobject->context &&
 245             my_pd->ownpid != cur_pid) {
 246                 ehca_err(ah->device, "Invalid caller pid=%x ownpid=%x",
 247                          cur_pid, my_pd->ownpid);
 248                 return -EINVAL;
 249         }
 250
 251         kmem_cache_free(av_cache, container_of(ah, struct ehca_av, ib_ah));
 252
 253         return 0;
 254 }
 255
 256 int ehca_init_av_cache(void)
 257 {
 258         av_cache = kmem_cache_create("ehca_cache_av",
 259                                    sizeof(struct ehca_av), 0,
 260                                    SLAB_HWCACHE_ALIGN,
 261                                    NULL, NULL);
 262         if (!av_cache)
 263                 return -ENOMEM;
 264         return 0;
 265 }
 266
 267 void ehca_cleanup_av_cache(void)
 268 {
 269         if (av_cache)
 270                 kmem_cache_destroy(av_cache);
 271 }