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   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 int ehca_calc_ipd(struct ehca_shca *shca, int port,
  54                   enum ib_rate path_rate, u32 *ipd)
  55 {
  56         int path = ib_rate_to_mult(path_rate);
  57         int link, ret;
  58         struct ib_port_attr pa;
  59
  60         if (path_rate == IB_RATE_PORT_CURRENT) {
  61                 *ipd = 0;
  62                 return 0;
  63         }
  64
  65         if (unlikely(path < 0)) {
  66                 ehca_err(&shca->ib_device, "Invalid static rate! path_rate=%x",
  67                          path_rate);
  68                 return -EINVAL;
  69         }
  70
  71         ret = ehca_query_port(&shca->ib_device, port, &pa);
  72         if (unlikely(ret < 0)) {
  73                 ehca_err(&shca->ib_device, "Failed to query port  ret=%i", ret);
  74                 return ret;
  75         }
  76
  77         link = ib_width_enum_to_int(pa.active_width) * pa.active_speed;
  78
  79         /* IPD = round((link / path) - 1) */
  80         *ipd = ((link + (path >> 1)) / path) - 1;
  81
  82         return 0;
  83 }
  84
  85 struct ib_ah *ehca_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr)
  86 {
  87         int ret;
  88         struct ehca_av *av;
  89         struct ehca_shca *shca = container_of(pd->device, struct ehca_shca,
  90                                               ib_device);
  91
  92         av = kmem_cache_alloc(av_cache, GFP_KERNEL);
  93         if (!av) {
  94                 ehca_err(pd->device, "Out of memory pd=%p ah_attr=%p",
  95                          pd, ah_attr);
  96                 return ERR_PTR(-ENOMEM);
  97         }
  98
  99         av->av.sl = ah_attr->sl;
 100         av->av.dlid = ah_attr->dlid;
 101         av->av.slid_path_bits = ah_attr->src_path_bits;
 102
 103         if (ehca_static_rate < 0) {
 104                 u32 ipd;
 105                 if (ehca_calc_ipd(shca, ah_attr->port_num,
 106                                   ah_attr->static_rate, &ipd)) {
 107                         ret = -EINVAL;
 108                         goto create_ah_exit1;
 109                 }
 110                 av->av.ipd = ipd;
 111         } else
 112                 av->av.ipd = ehca_static_rate;
 113
 114         av->av.lnh = ah_attr->ah_flags;
 115         av->av.grh.word_0 = EHCA_BMASK_SET(GRH_IPVERSION_MASK, 6);
 116         av->av.grh.word_0 |= EHCA_BMASK_SET(GRH_TCLASS_MASK,
 117                                             ah_attr->grh.traffic_class);
 118         av->av.grh.word_0 |= EHCA_BMASK_SET(GRH_FLOWLABEL_MASK,
 119                                             ah_attr->grh.flow_label);
 120         av->av.grh.word_0 |= EHCA_BMASK_SET(GRH_HOPLIMIT_MASK,
 121                                             ah_attr->grh.hop_limit);
 122         av->av.grh.word_0 |= EHCA_BMASK_SET(GRH_NEXTHEADER_MASK, 0x1B);
 123         /* set sgid in grh.word_1 */
 124         if (ah_attr->ah_flags & IB_AH_GRH) {
 125                 int rc;
 126                 struct ib_port_attr port_attr;
 127                 union ib_gid gid;
 128                 memset(&port_attr, 0, sizeof(port_attr));
 129                 rc = ehca_query_port(pd->device, ah_attr->port_num,
 130                                      &port_attr);
 131                 if (rc) { /* invalid port number */
 132                         ret = -EINVAL;
 133                         ehca_err(pd->device, "Invalid port number "
 134                                  "ehca_query_port() returned %x "
 135                                  "pd=%p ah_attr=%p", rc, pd, ah_attr);
 136                         goto create_ah_exit1;
 137                 }
 138                 memset(&gid, 0, sizeof(gid));
 139                 rc = ehca_query_gid(pd->device,
 140                                     ah_attr->port_num,
 141                                     ah_attr->grh.sgid_index, &gid);
 142                 if (rc) {
 143                         ret = -EINVAL;
 144                         ehca_err(pd->device, "Failed to retrieve sgid "
 145                                  "ehca_query_gid() returned %x "
 146                                  "pd=%p ah_attr=%p", rc, pd, ah_attr);
 147                         goto create_ah_exit1;
 148                 }
 149                 memcpy(&av->av.grh.word_1, &gid, sizeof(gid));
 150         }
 151         av->av.pmtu = shca->max_mtu;
 152
 153         /* dgid comes in grh.word_3 */
 154         memcpy(&av->av.grh.word_3, &ah_attr->grh.dgid,
 155                sizeof(ah_attr->grh.dgid));
 156
 157         return &av->ib_ah;
 158
 159 create_ah_exit1:
 160         kmem_cache_free(av_cache, av);
 161
 162         return ERR_PTR(ret);
 163 }
 164
 165 int ehca_modify_ah(struct ib_ah *ah, struct ib_ah_attr *ah_attr)
 166 {
 167         struct ehca_av *av;
 168         struct ehca_ud_av new_ehca_av;
 169         struct ehca_pd *my_pd = container_of(ah->pd, struct ehca_pd, ib_pd);
 170         struct ehca_shca *shca = container_of(ah->pd->device, struct ehca_shca,
 171                                               ib_device);
 172         u32 cur_pid = current->tgid;
 173
 174         if (my_pd->ib_pd.uobject && my_pd->ib_pd.uobject->context &&
 175             my_pd->ownpid != cur_pid) {
 176                 ehca_err(ah->device, "Invalid caller pid=%x ownpid=%x",
 177                          cur_pid, my_pd->ownpid);
 178                 return -EINVAL;
 179         }
 180
 181         memset(&new_ehca_av, 0, sizeof(new_ehca_av));
 182         new_ehca_av.sl = ah_attr->sl;
 183         new_ehca_av.dlid = ah_attr->dlid;
 184         new_ehca_av.slid_path_bits = ah_attr->src_path_bits;
 185         new_ehca_av.ipd = ah_attr->static_rate;
 186         new_ehca_av.lnh = EHCA_BMASK_SET(GRH_FLAG_MASK,
 187                                          (ah_attr->ah_flags & IB_AH_GRH) > 0);
 188         new_ehca_av.grh.word_0 = EHCA_BMASK_SET(GRH_TCLASS_MASK,
 189                                                 ah_attr->grh.traffic_class);
 190         new_ehca_av.grh.word_0 |= EHCA_BMASK_SET(GRH_FLOWLABEL_MASK,
 191                                                  ah_attr->grh.flow_label);
 192         new_ehca_av.grh.word_0 |= EHCA_BMASK_SET(GRH_HOPLIMIT_MASK,
 193                                                  ah_attr->grh.hop_limit);
 194         new_ehca_av.grh.word_0 |= EHCA_BMASK_SET(GRH_NEXTHEADER_MASK, 0x1b);
 195
 196         /* set sgid in grh.word_1 */
 197         if (ah_attr->ah_flags & IB_AH_GRH) {
 198                 int rc;
 199                 struct ib_port_attr port_attr;
 200                 union ib_gid gid;
 201                 memset(&port_attr, 0, sizeof(port_attr));
 202                 rc = ehca_query_port(ah->device, ah_attr->port_num,
 203                                      &port_attr);
 204                 if (rc) { /* invalid port number */
 205                         ehca_err(ah->device, "Invalid port number "
 206                                  "ehca_query_port() returned %x "
 207                                  "ah=%p ah_attr=%p port_num=%x",
 208                                  rc, ah, ah_attr, ah_attr->port_num);
 209                         return -EINVAL;
 210                 }
 211                 memset(&gid, 0, sizeof(gid));
 212                 rc = ehca_query_gid(ah->device,
 213                                     ah_attr->port_num,
 214                                     ah_attr->grh.sgid_index, &gid);
 215                 if (rc) {
 216                         ehca_err(ah->device, "Failed to retrieve sgid "
 217                                  "ehca_query_gid() returned %x "
 218                                  "ah=%p ah_attr=%p port_num=%x "
 219                                  "sgid_index=%x",
 220                                  rc, ah, ah_attr, ah_attr->port_num,
 221                                  ah_attr->grh.sgid_index);
 222                         return -EINVAL;
 223                 }
 224                 memcpy(&new_ehca_av.grh.word_1, &gid, sizeof(gid));
 225         }
 226
 227         new_ehca_av.pmtu = shca->max_mtu;
 228
 229         memcpy(&new_ehca_av.grh.word_3, &ah_attr->grh.dgid,
 230                sizeof(ah_attr->grh.dgid));
 231
 232         av = container_of(ah, struct ehca_av, ib_ah);
 233         av->av = new_ehca_av;
 234
 235         return 0;
 236 }
 237
 238 int ehca_query_ah(struct ib_ah *ah, struct ib_ah_attr *ah_attr)
 239 {
 240         struct ehca_av *av = container_of(ah, struct ehca_av, ib_ah);
 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         memcpy(&ah_attr->grh.dgid, &av->av.grh.word_3,
 252                sizeof(ah_attr->grh.dgid));
 253         ah_attr->sl = av->av.sl;
 254
 255         ah_attr->dlid = av->av.dlid;
 256
 257         ah_attr->src_path_bits = av->av.slid_path_bits;
 258         ah_attr->static_rate = av->av.ipd;
 259         ah_attr->ah_flags = EHCA_BMASK_GET(GRH_FLAG_MASK, av->av.lnh);
 260         ah_attr->grh.traffic_class = EHCA_BMASK_GET(GRH_TCLASS_MASK,
 261                                                     av->av.grh.word_0);
 262         ah_attr->grh.hop_limit = EHCA_BMASK_GET(GRH_HOPLIMIT_MASK,
 263                                                 av->av.grh.word_0);
 264         ah_attr->grh.flow_label = EHCA_BMASK_GET(GRH_FLOWLABEL_MASK,
 265                                                  av->av.grh.word_0);
 266
 267         return 0;
 268 }
 269
 270 int ehca_destroy_ah(struct ib_ah *ah)
 271 {
 272         struct ehca_pd *my_pd = container_of(ah->pd, struct ehca_pd, ib_pd);
 273         u32 cur_pid = current->tgid;
 274
 275         if (my_pd->ib_pd.uobject && my_pd->ib_pd.uobject->context &&
 276             my_pd->ownpid != cur_pid) {
 277                 ehca_err(ah->device, "Invalid caller pid=%x ownpid=%x",
 278                          cur_pid, my_pd->ownpid);
 279                 return -EINVAL;
 280         }
 281
 282         kmem_cache_free(av_cache, container_of(ah, struct ehca_av, ib_ah));
 283
 284         return 0;
 285 }
 286
 287 int ehca_init_av_cache(void)
 288 {
 289         av_cache = kmem_cache_create("ehca_cache_av",
 290                                    sizeof(struct ehca_av), 0,
 291                                    SLAB_HWCACHE_ALIGN,
 292                                    NULL);
 293         if (!av_cache)
 294                 return -ENOMEM;
 295         return 0;
 296 }
 297
 298 void ehca_cleanup_av_cache(void)
 299 {
 300         if (av_cache)
 301                 kmem_cache_destroy(av_cache);
 302 }