drivers/infiniband/hw/mthca/mthca_av.c

   1 /*
   2  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  *
  32  * $Id: mthca_av.c 1349 2004-12-16 21:09:43Z roland $
  33  */
  34
  35 #include <linux/init.h>
  36
  37 #include <ib_verbs.h>
  38 #include <ib_cache.h>
  39
  40 #include "mthca_dev.h"
  41
  42 struct mthca_av {
  43         u32 port_pd;
  44         u8  reserved1;
  45         u8  g_slid;
  46         u16 dlid;
  47         u8  reserved2;
  48         u8  gid_index;
  49         u8  msg_sr;
  50         u8  hop_limit;
  51         u32 sl_tclass_flowlabel;
  52         u32 dgid[4];
  53 };
  54
  55 int mthca_create_ah(struct mthca_dev *dev,
  56                     struct mthca_pd *pd,
  57                     struct ib_ah_attr *ah_attr,
  58                     struct mthca_ah *ah)
  59 {
  60         u32 index = -1;
  61         struct mthca_av *av = NULL;
  62
  63         ah->type = MTHCA_AH_PCI_POOL;
  64
  65         if (mthca_is_memfree(dev)) {
  66                 ah->av   = kmalloc(sizeof *ah->av, GFP_ATOMIC);
  67                 if (!ah->av)
  68                         return -ENOMEM;
  69
  70                 ah->type = MTHCA_AH_KMALLOC;
  71                 av       = ah->av;
  72         } else if (!atomic_read(&pd->sqp_count) &&
  73                  !(dev->mthca_flags & MTHCA_FLAG_DDR_HIDDEN)) {
  74                 index = mthca_alloc(&dev->av_table.alloc);
  75
  76                 /* fall back to allocate in host memory */
  77                 if (index == -1)
  78                         goto on_hca_fail;
  79
  80                 av = kmalloc(sizeof *av, GFP_ATOMIC);
  81                 if (!av)
  82                         goto on_hca_fail;
  83
  84                 ah->type = MTHCA_AH_ON_HCA;
  85                 ah->avdma  = dev->av_table.ddr_av_base +
  86                         index * MTHCA_AV_SIZE;
  87         }
  88
  89 on_hca_fail:
  90         if (ah->type == MTHCA_AH_PCI_POOL) {
  91                 ah->av = pci_pool_alloc(dev->av_table.pool,
  92                                         SLAB_ATOMIC, &ah->avdma);
  93                 if (!ah->av)
  94                         return -ENOMEM;
  95
  96                 av = ah->av;
  97         }
  98
  99         ah->key = pd->ntmr.ibmr.lkey;
 100
 101         memset(av, 0, MTHCA_AV_SIZE);
 102
 103         av->port_pd = cpu_to_be32(pd->pd_num | (ah_attr->port_num << 24));
 104         av->g_slid  = ah_attr->src_path_bits;
 105         av->dlid    = cpu_to_be16(ah_attr->dlid);
 106         av->msg_sr  = (3 << 4) | /* 2K message */
 107                 ah_attr->static_rate;
 108         av->sl_tclass_flowlabel = cpu_to_be32(ah_attr->sl << 28);
 109         if (ah_attr->ah_flags & IB_AH_GRH) {
 110                 av->g_slid |= 0x80;
 111                 av->gid_index = (ah_attr->port_num - 1) * dev->limits.gid_table_len +
 112                         ah_attr->grh.sgid_index;
 113                 av->hop_limit = ah_attr->grh.hop_limit;
 114                 av->sl_tclass_flowlabel |=
 115                         cpu_to_be32((ah_attr->grh.traffic_class << 20) |
 116                                     ah_attr->grh.flow_label);
 117                 memcpy(av->dgid, ah_attr->grh.dgid.raw, 16);
 118         } else {
 119                 /* Arbel workaround -- low byte of GID must be 2 */
 120                 av->dgid[3] = cpu_to_be32(2);
 121         }
 122
 123         if (0) {
 124                 int j;
 125
 126                 mthca_dbg(dev, "Created UDAV at %p/%08lx:\n",
 127                           av, (unsigned long) ah->avdma);
 128                 for (j = 0; j < 8; ++j)
 129                         printk(KERN_DEBUG "  [%2x] %08x\n",
 130                                j * 4, be32_to_cpu(((u32 *) av)[j]));
 131         }
 132
 133         if (ah->type == MTHCA_AH_ON_HCA) {
 134                 memcpy_toio(dev->av_table.av_map + index * MTHCA_AV_SIZE,
 135                             av, MTHCA_AV_SIZE);
 136                 kfree(av);
 137         }
 138
 139         return 0;
 140 }
 141
 142 int mthca_destroy_ah(struct mthca_dev *dev, struct mthca_ah *ah)
 143 {
 144         switch (ah->type) {
 145         case MTHCA_AH_ON_HCA:
 146                 mthca_free(&dev->av_table.alloc,
 147                            (ah->avdma - dev->av_table.ddr_av_base) /
 148                            MTHCA_AV_SIZE);
 149                 break;
 150
 151         case MTHCA_AH_PCI_POOL:
 152                 pci_pool_free(dev->av_table.pool, ah->av, ah->avdma);
 153                 break;
 154
 155         case MTHCA_AH_KMALLOC:
 156                 kfree(ah->av);
 157                 break;
 158         }
 159
 160         return 0;
 161 }
 162
 163 int mthca_read_ah(struct mthca_dev *dev, struct mthca_ah *ah,
 164                   struct ib_ud_header *header)
 165 {
 166         if (ah->type == MTHCA_AH_ON_HCA)
 167                 return -EINVAL;
 168
 169         header->lrh.service_level   = be32_to_cpu(ah->av->sl_tclass_flowlabel) >> 28;
 170         header->lrh.destination_lid = ah->av->dlid;
 171         header->lrh.source_lid      = ah->av->g_slid & 0x7f;
 172         if (ah->av->g_slid & 0x80) {
 173                 header->grh_present = 1;
 174                 header->grh.traffic_class =
 175                         (be32_to_cpu(ah->av->sl_tclass_flowlabel) >> 20) & 0xff;
 176                 header->grh.flow_label    =
 177                         ah->av->sl_tclass_flowlabel & cpu_to_be32(0xfffff);
 178                 ib_get_cached_gid(&dev->ib_dev,
 179                                   be32_to_cpu(ah->av->port_pd) >> 24,
 180                                   ah->av->gid_index,
 181                                   &header->grh.source_gid);
 182                 memcpy(header->grh.destination_gid.raw,
 183                        ah->av->dgid, 16);
 184         } else {
 185                 header->grh_present = 0;
 186         }
 187
 188         return 0;
 189 }
 190
 191 int __devinit mthca_init_av_table(struct mthca_dev *dev)
 192 {
 193         int err;
 194
 195         if (mthca_is_memfree(dev))
 196                 return 0;
 197
 198         err = mthca_alloc_init(&dev->av_table.alloc,
 199                                dev->av_table.num_ddr_avs,
 200                                dev->av_table.num_ddr_avs - 1,
 201                                0);
 202         if (err)
 203                 return err;
 204
 205         dev->av_table.pool = pci_pool_create("mthca_av", dev->pdev,
 206                                              MTHCA_AV_SIZE,
 207                                              MTHCA_AV_SIZE, 0);
 208         if (!dev->av_table.pool)
 209                 goto out_free_alloc;
 210
 211         if (!(dev->mthca_flags & MTHCA_FLAG_DDR_HIDDEN)) {
 212                 dev->av_table.av_map = ioremap(pci_resource_start(dev->pdev, 4) +
 213                                                dev->av_table.ddr_av_base -
 214                                                dev->ddr_start,
 215                                                dev->av_table.num_ddr_avs *
 216                                                MTHCA_AV_SIZE);
 217                 if (!dev->av_table.av_map)
 218                         goto out_free_pool;
 219         } else
 220                 dev->av_table.av_map = NULL;
 221
 222         return 0;
 223
 224  out_free_pool:
 225         pci_pool_destroy(dev->av_table.pool);
 226
 227  out_free_alloc:
 228         mthca_alloc_cleanup(&dev->av_table.alloc);
 229         return -ENOMEM;
 230 }
 231
 232 void __devexit mthca_cleanup_av_table(struct mthca_dev *dev)
 233 {
 234         if (mthca_is_memfree(dev))
 235                 return;
 236
 237         if (dev->av_table.av_map)
 238                 iounmap(dev->av_table.av_map);
 239         pci_pool_destroy(dev->av_table.pool);
 240         mthca_alloc_cleanup(&dev->av_table.alloc);
 241 }