drivers/infiniband/hw/ehca/ehca_av.c

   1 /*
   2  *  IBM eServer eHCA Infiniband device driver for Linux on POWER
   3  *
   4  *  address 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 #include "ehca_tools.h"
  45 #include "ehca_iverbs.h"
  46 #include "hcp_if.h"
  47
  48 static struct kmem_cache *av_cache;
  49
  50 int ehca_calc_ipd(struct ehca_shca *shca, int port,
  51                   enum ib_rate path_rate, u32 *ipd)
  52 {
  53         int path = ib_rate_to_mult(path_rate);
  54         int link, ret;
  55         struct ib_port_attr pa;
  56
  57         if (path_rate == IB_RATE_PORT_CURRENT) {
  58                 *ipd = 0;
  59                 return 0;
  60         }
  61
  62         if (unlikely(path < 0)) {
  63                 ehca_err(&shca->ib_device, "Invalid static rate! path_rate=%x",
  64                          path_rate);
  65                 return -EINVAL;
  66         }
  67
  68         ret = ehca_query_port(&shca->ib_device, port, &pa);
  69         if (unlikely(ret < 0)) {
  70                 ehca_err(&shca->ib_device, "Failed to query port  ret=%i", ret);
  71                 return ret;
  72         }
  73
  74         link = ib_width_enum_to_int(pa.active_width) * pa.active_speed;
  75
  76         if (path >= link)
  77                 /* no need to throttle if path faster than link */
  78                 *ipd = 0;
  79         else
  80                 /* IPD = round((link / path) - 1) */
  81                 *ipd = ((link + (path >> 1)) / path) - 1;
  82
  83         return 0;
  84 }
  85
  86 struct ib_ah *ehca_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr)
  87 {
  88         int ret;
  89         struct ehca_av *av;
  90         struct ehca_shca *shca = container_of(pd->device, struct ehca_shca,
  91                                               ib_device);
  92
  93         av = kmem_cache_alloc(av_cache, GFP_KERNEL);
  94         if (!av) {
  95                 ehca_err(pd->device, "Out of memory pd=%p ah_attr=%p",
  96                          pd, ah_attr);
  97                 return ERR_PTR(-ENOMEM);
  98         }
  99
 100         av->av.sl = ah_attr->sl;
 101         av->av.dlid = ah_attr->dlid;
 102         av->av.slid_path_bits = ah_attr->src_path_bits;
 103
 104         if (ehca_static_rate < 0) {
 105                 u32 ipd;
 106                 if (ehca_calc_ipd(shca, ah_attr->port_num,
 107                                   ah_attr->static_rate, &ipd)) {
 108                         ret = -EINVAL;
 109                         goto create_ah_exit1;
 110                 }
 111                 av->av.ipd = ipd;
 112         } else
 113                 av->av.ipd = ehca_static_rate;
 114
 115         av->av.lnh = ah_attr->ah_flags;
 116         av->av.grh.word_0 = EHCA_BMASK_SET(GRH_IPVERSION_MASK, 6);
 117         av->av.grh.word_0 |= EHCA_BMASK_SET(GRH_TCLASS_MASK,
 118                                             ah_attr->grh.traffic_class);
 119         av->av.grh.word_0 |= EHCA_BMASK_SET(GRH_FLOWLABEL_MASK,
 120                                             ah_attr->grh.flow_label);
 121         av->av.grh.word_0 |= EHCA_BMASK_SET(GRH_HOPLIMIT_MASK,
 122                                             ah_attr->grh.hop_limit);
 123         av->av.grh.word_0 |= EHCA_BMASK_SET(GRH_NEXTHEADER_MASK, 0x1B);
 124         /* set sgid in grh.word_1 */
 125         if (ah_attr->ah_flags & IB_AH_GRH) {
 126                 int rc;
 127                 struct ib_port_attr port_attr;
 128                 union ib_gid gid;
 129                 memset(&port_attr, 0, sizeof(port_attr));
 130                 rc = ehca_query_port(pd->device, ah_attr->port_num,
 131                                      &port_attr);
 132                 if (rc) { /* invalid port number */
 133                         ret = -EINVAL;
 134                         ehca_err(pd->device, "Invalid port number "
 135                                  "ehca_query_port() returned %x "
 136                                  "pd=%p ah_attr=%p", rc, pd, ah_attr);
 137                         goto create_ah_exit1;
 138                 }
 139                 memset(&gid, 0, sizeof(gid));
 140                 rc = ehca_query_gid(pd->device,
 141                                     ah_attr->port_num,
 142                                     ah_attr->grh.sgid_index, &gid);
 143                 if (rc) {
 144                         ret = -EINVAL;
 145                         ehca_err(pd->device, "Failed to retrieve sgid "
 146                                  "ehca_query_gid() returned %x "
 147                                  "pd=%p ah_attr=%p", rc, pd, ah_attr);
 148                         goto create_ah_exit1;
 149                 }
 150                 memcpy(&av->av.grh.word_1, &gid, sizeof(gid));
 151         }
 152         av->av.pmtu = shca->max_mtu;
 153
 154         /* dgid comes in grh.word_3 */
 155         memcpy(&av->av.grh.word_3, &ah_attr->grh.dgid,
 156                sizeof(ah_attr->grh.dgid));
 157
 158         return &av->ib_ah;
 159
 160 create_ah_exit1:
 161         kmem_cache_free(av_cache, av);
 162
 163         return ERR_PTR(ret);
 164 }
 165
 166 int ehca_modify_ah(struct ib_ah *ah, struct ib_ah_attr *ah_attr)
 167 {
 168         struct ehca_av *av;
 169         struct ehca_ud_av new_ehca_av;
 170         struct ehca_shca *shca = container_of(ah->pd->device, struct ehca_shca,
 171                                               ib_device);
 172
 173         memset(&new_ehca_av, 0, sizeof(new_ehca_av));
 174         new_ehca_av.sl = ah_attr->sl;
 175         new_ehca_av.dlid = ah_attr->dlid;
 176         new_ehca_av.slid_path_bits = ah_attr->src_path_bits;
 177         new_ehca_av.ipd = ah_attr->static_rate;
 178         new_ehca_av.lnh = EHCA_BMASK_SET(GRH_FLAG_MASK,
 179                                          (ah_attr->ah_flags & IB_AH_GRH) > 0);
 180         new_ehca_av.grh.word_0 = EHCA_BMASK_SET(GRH_TCLASS_MASK,
 181                                                 ah_attr->grh.traffic_class);
 182         new_ehca_av.grh.word_0 |= EHCA_BMASK_SET(GRH_FLOWLABEL_MASK,
 183                                                  ah_attr->grh.flow_label);
 184         new_ehca_av.grh.word_0 |= EHCA_BMASK_SET(GRH_HOPLIMIT_MASK,
 185                                                  ah_attr->grh.hop_limit);
 186         new_ehca_av.grh.word_0 |= EHCA_BMASK_SET(GRH_NEXTHEADER_MASK, 0x1b);
 187
 188         /* set sgid in grh.word_1 */
 189         if (ah_attr->ah_flags & IB_AH_GRH) {
 190                 int rc;
 191                 struct ib_port_attr port_attr;
 192                 union ib_gid gid;
 193                 memset(&port_attr, 0, sizeof(port_attr));
 194                 rc = ehca_query_port(ah->device, ah_attr->port_num,
 195                                      &port_attr);
 196                 if (rc) { /* invalid port number */
 197                         ehca_err(ah->device, "Invalid port number "
 198                                  "ehca_query_port() returned %x "
 199                                  "ah=%p ah_attr=%p port_num=%x",
 200                                  rc, ah, ah_attr, ah_attr->port_num);
 201                         return -EINVAL;
 202                 }
 203                 memset(&gid, 0, sizeof(gid));
 204                 rc = ehca_query_gid(ah->device,
 205                                     ah_attr->port_num,
 206                                     ah_attr->grh.sgid_index, &gid);
 207                 if (rc) {
 208                         ehca_err(ah->device, "Failed to retrieve sgid "
 209                                  "ehca_query_gid() returned %x "
 210                                  "ah=%p ah_attr=%p port_num=%x "
 211                                  "sgid_index=%x",
 212                                  rc, ah, ah_attr, ah_attr->port_num,
 213                                  ah_attr->grh.sgid_index);
 214                         return -EINVAL;
 215                 }
 216                 memcpy(&new_ehca_av.grh.word_1, &gid, sizeof(gid));
 217         }
 218
 219         new_ehca_av.pmtu = shca->max_mtu;
 220
 221         memcpy(&new_ehca_av.grh.word_3, &ah_attr->grh.dgid,
 222                sizeof(ah_attr->grh.dgid));
 223
 224         av = container_of(ah, struct ehca_av, ib_ah);
 225         av->av = new_ehca_av;
 226
 227         return 0;
 228 }
 229
 230 int ehca_query_ah(struct ib_ah *ah, struct ib_ah_attr *ah_attr)
 231 {
 232         struct ehca_av *av = container_of(ah, struct ehca_av, ib_ah);
 233
 234         memcpy(&ah_attr->grh.dgid, &av->av.grh.word_3,
 235                sizeof(ah_attr->grh.dgid));
 236         ah_attr->sl = av->av.sl;
 237
 238         ah_attr->dlid = av->av.dlid;
 239
 240         ah_attr->src_path_bits = av->av.slid_path_bits;
 241         ah_attr->static_rate = av->av.ipd;
 242         ah_attr->ah_flags = EHCA_BMASK_GET(GRH_FLAG_MASK, av->av.lnh);
 243         ah_attr->grh.traffic_class = EHCA_BMASK_GET(GRH_TCLASS_MASK,
 244                                                     av->av.grh.word_0);
 245         ah_attr->grh.hop_limit = EHCA_BMASK_GET(GRH_HOPLIMIT_MASK,
 246                                                 av->av.grh.word_0);
 247         ah_attr->grh.flow_label = EHCA_BMASK_GET(GRH_FLOWLABEL_MASK,
 248                                                  av->av.grh.word_0);
 249
 250         return 0;
 251 }
 252
 253 int ehca_destroy_ah(struct ib_ah *ah)
 254 {
 255         kmem_cache_free(av_cache, container_of(ah, struct ehca_av, ib_ah));
 256
 257         return 0;
 258 }
 259
 260 int ehca_init_av_cache(void)
 261 {
 262         av_cache = kmem_cache_create("ehca_cache_av",
 263                                    sizeof(struct ehca_av), 0,
 264                                    SLAB_HWCACHE_ALIGN,
 265                                    NULL);
 266         if (!av_cache)
 267                 return -ENOMEM;
 268         return 0;
 269 }
 270
 271 void ehca_cleanup_av_cache(void)
 272 {
 273         if (av_cache)
 274                 kmem_cache_destroy(av_cache);
 275 }