drivers/infiniband/hw/mthca/mthca_av.c

   1 /*
   2  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the
   9  * OpenIB.org BSD license below:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      - Redistributions of source code must retain the above
  16  *        copyright notice, this list of conditions and the following
  17  *        disclaimer.
  18  *
  19  *      - Redistributions in binary form must reproduce the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer in the documentation and/or other materials
  22  *        provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  */
  33
  34 #include <linux/string.h>
  35 #include <linux/slab.h>
  36
  37 #include <rdma/ib_verbs.h>
  38 #include <rdma/ib_cache.h>
  39
  40 #include "mthca_dev.h"
  41
  42 enum {
  43       MTHCA_RATE_TAVOR_FULL   = 0,
  44       MTHCA_RATE_TAVOR_1X     = 1,
  45       MTHCA_RATE_TAVOR_4X     = 2,
  46       MTHCA_RATE_TAVOR_1X_DDR = 3
  47 };
  48
  49 enum {
  50       MTHCA_RATE_MEMFREE_FULL    = 0,
  51       MTHCA_RATE_MEMFREE_QUARTER = 1,
  52       MTHCA_RATE_MEMFREE_EIGHTH  = 2,
  53       MTHCA_RATE_MEMFREE_HALF    = 3
  54 };
  55
  56 struct mthca_av {
  57         __be32 port_pd;
  58         u8     reserved1;
  59         u8     g_slid;
  60         __be16 dlid;
  61         u8     reserved2;
  62         u8     gid_index;
  63         u8     msg_sr;
  64         u8     hop_limit;
  65         __be32 sl_tclass_flowlabel;
  66         __be32 dgid[4];
  67 };
  68
  69 static enum ib_rate memfree_rate_to_ib(u8 mthca_rate, u8 port_rate)
  70 {
  71         switch (mthca_rate) {
  72         case MTHCA_RATE_MEMFREE_EIGHTH:
  73                 return mult_to_ib_rate(port_rate >> 3);
  74         case MTHCA_RATE_MEMFREE_QUARTER:
  75                 return mult_to_ib_rate(port_rate >> 2);
  76         case MTHCA_RATE_MEMFREE_HALF:
  77                 return mult_to_ib_rate(port_rate >> 1);
  78         case MTHCA_RATE_MEMFREE_FULL:
  79         default:
  80                 return mult_to_ib_rate(port_rate);
  81         }
  82 }
  83
  84 static enum ib_rate tavor_rate_to_ib(u8 mthca_rate, u8 port_rate)
  85 {
  86         switch (mthca_rate) {
  87         case MTHCA_RATE_TAVOR_1X:     return IB_RATE_2_5_GBPS;
  88         case MTHCA_RATE_TAVOR_1X_DDR: return IB_RATE_5_GBPS;
  89         case MTHCA_RATE_TAVOR_4X:     return IB_RATE_10_GBPS;
  90         default:                      return mult_to_ib_rate(port_rate);
  91         }
  92 }
  93
  94 enum ib_rate mthca_rate_to_ib(struct mthca_dev *dev, u8 mthca_rate, u8 port)
  95 {
  96         if (mthca_is_memfree(dev)) {
  97                 /* Handle old Arbel FW */
  98                 if (dev->limits.stat_rate_support == 0x3 && mthca_rate)
  99                         return IB_RATE_2_5_GBPS;
 100
 101                 return memfree_rate_to_ib(mthca_rate, dev->rate[port - 1]);
 102         } else
 103                 return tavor_rate_to_ib(mthca_rate, dev->rate[port - 1]);
 104 }
 105
 106 static u8 ib_rate_to_memfree(u8 req_rate, u8 cur_rate)
 107 {
 108         if (cur_rate <= req_rate)
 109                 return 0;
 110
 111         /*
 112          * Inter-packet delay (IPD) to get from rate X down to a rate
 113          * no more than Y is (X - 1) / Y.
 114          */
 115         switch ((cur_rate - 1) / req_rate) {
 116         case 0:  return MTHCA_RATE_MEMFREE_FULL;
 117         case 1:  return MTHCA_RATE_MEMFREE_HALF;
 118         case 2:  /* fall through */
 119         case 3:  return MTHCA_RATE_MEMFREE_QUARTER;
 120         default: return MTHCA_RATE_MEMFREE_EIGHTH;
 121         }
 122 }
 123
 124 static u8 ib_rate_to_tavor(u8 static_rate)
 125 {
 126         switch (static_rate) {
 127         case IB_RATE_2_5_GBPS: return MTHCA_RATE_TAVOR_1X;
 128         case IB_RATE_5_GBPS:   return MTHCA_RATE_TAVOR_1X_DDR;
 129         case IB_RATE_10_GBPS:  return MTHCA_RATE_TAVOR_4X;
 130         default:               return MTHCA_RATE_TAVOR_FULL;
 131         }
 132 }
 133
 134 u8 mthca_get_rate(struct mthca_dev *dev, int static_rate, u8 port)
 135 {
 136         u8 rate;
 137
 138         if (!static_rate || ib_rate_to_mult(static_rate) >= dev->rate[port - 1])
 139                 return 0;
 140
 141         if (mthca_is_memfree(dev))
 142                 rate = ib_rate_to_memfree(ib_rate_to_mult(static_rate),
 143                                           dev->rate[port - 1]);
 144         else
 145                 rate = ib_rate_to_tavor(static_rate);
 146
 147         if (!(dev->limits.stat_rate_support & (1 << rate)))
 148                 rate = 1;
 149
 150         return rate;
 151 }
 152
 153 int mthca_create_ah(struct mthca_dev *dev,
 154                     struct mthca_pd *pd,
 155                     struct rdma_ah_attr *ah_attr,
 156                     struct mthca_ah *ah)
 157 {
 158         u32 index = -1;
 159         struct mthca_av *av = NULL;
 160
 161         ah->type = MTHCA_AH_PCI_POOL;
 162
 163         if (mthca_is_memfree(dev)) {
 164                 ah->av   = kmalloc(sizeof *ah->av, GFP_ATOMIC);
 165                 if (!ah->av)
 166                         return -ENOMEM;
 167
 168                 ah->type = MTHCA_AH_KMALLOC;
 169                 av       = ah->av;
 170         } else if (!atomic_read(&pd->sqp_count) &&
 171                  !(dev->mthca_flags & MTHCA_FLAG_DDR_HIDDEN)) {
 172                 index = mthca_alloc(&dev->av_table.alloc);
 173
 174                 /* fall back to allocate in host memory */
 175                 if (index == -1)
 176                         goto on_hca_fail;
 177
 178                 av = kmalloc(sizeof *av, GFP_ATOMIC);
 179                 if (!av)
 180                         goto on_hca_fail;
 181
 182                 ah->type = MTHCA_AH_ON_HCA;
 183                 ah->avdma  = dev->av_table.ddr_av_base +
 184                         index * MTHCA_AV_SIZE;
 185         }
 186
 187 on_hca_fail:
 188         if (ah->type == MTHCA_AH_PCI_POOL) {
 189                 ah->av = dma_pool_zalloc(dev->av_table.pool,
 190                                          GFP_ATOMIC, &ah->avdma);
 191                 if (!ah->av)
 192                         return -ENOMEM;
 193
 194                 av = ah->av;
 195         }
 196
 197         ah->key = pd->ntmr.ibmr.lkey;
 198
 199         av->port_pd = cpu_to_be32(pd->pd_num |
 200                                   (rdma_ah_get_port_num(ah_attr) << 24));
 201         av->g_slid  = rdma_ah_get_path_bits(ah_attr);
 202         av->dlid    = cpu_to_be16(rdma_ah_get_dlid(ah_attr));
 203         av->msg_sr  = (3 << 4) | /* 2K message */
 204                 mthca_get_rate(dev, rdma_ah_get_static_rate(ah_attr),
 205                                rdma_ah_get_port_num(ah_attr));
 206         av->sl_tclass_flowlabel = cpu_to_be32(rdma_ah_get_sl(ah_attr) << 28);
 207         if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) {
 208                 const struct ib_global_route *grh = rdma_ah_read_grh(ah_attr);
 209
 210                 av->g_slid |= 0x80;
 211                 av->gid_index = (rdma_ah_get_port_num(ah_attr) - 1) *
 212                                   dev->limits.gid_table_len +
 213                                   grh->sgid_index;
 214                 av->hop_limit = grh->hop_limit;
 215                 av->sl_tclass_flowlabel |=
 216                         cpu_to_be32((grh->traffic_class << 20) |
 217                                     grh->flow_label);
 218                 memcpy(av->dgid, grh->dgid.raw, 16);
 219         } else {
 220                 /* Arbel workaround -- low byte of GID must be 2 */
 221                 av->dgid[3] = cpu_to_be32(2);
 222         }
 223
 224         if (0) {
 225                 int j;
 226
 227                 mthca_dbg(dev, "Created UDAV at %p/%08lx:\n",
 228                           av, (unsigned long) ah->avdma);
 229                 for (j = 0; j < 8; ++j)
 230                         printk(KERN_DEBUG "  [%2x] %08x\n",
 231                                j * 4, be32_to_cpu(((__be32 *) av)[j]));
 232         }
 233
 234         if (ah->type == MTHCA_AH_ON_HCA) {
 235                 memcpy_toio(dev->av_table.av_map + index * MTHCA_AV_SIZE,
 236                             av, MTHCA_AV_SIZE);
 237                 kfree(av);
 238         }
 239
 240         return 0;
 241 }
 242
 243 int mthca_destroy_ah(struct mthca_dev *dev, struct mthca_ah *ah)
 244 {
 245         switch (ah->type) {
 246         case MTHCA_AH_ON_HCA:
 247                 mthca_free(&dev->av_table.alloc,
 248                            (ah->avdma - dev->av_table.ddr_av_base) /
 249                            MTHCA_AV_SIZE);
 250                 break;
 251
 252         case MTHCA_AH_PCI_POOL:
 253                 dma_pool_free(dev->av_table.pool, ah->av, ah->avdma);
 254                 break;
 255
 256         case MTHCA_AH_KMALLOC:
 257                 kfree(ah->av);
 258                 break;
 259         }
 260
 261         return 0;
 262 }
 263
 264 int mthca_ah_grh_present(struct mthca_ah *ah)
 265 {
 266         return !!(ah->av->g_slid & 0x80);
 267 }
 268
 269 int mthca_read_ah(struct mthca_dev *dev, struct mthca_ah *ah,
 270                   struct ib_ud_header *header)
 271 {
 272         if (ah->type == MTHCA_AH_ON_HCA)
 273                 return -EINVAL;
 274
 275         header->lrh.service_level   = be32_to_cpu(ah->av->sl_tclass_flowlabel) >> 28;
 276         header->lrh.destination_lid = ah->av->dlid;
 277         header->lrh.source_lid      = cpu_to_be16(ah->av->g_slid & 0x7f);
 278         if (mthca_ah_grh_present(ah)) {
 279                 header->grh.traffic_class =
 280                         (be32_to_cpu(ah->av->sl_tclass_flowlabel) >> 20) & 0xff;
 281                 header->grh.flow_label    =
 282                         ah->av->sl_tclass_flowlabel & cpu_to_be32(0xfffff);
 283                 header->grh.hop_limit     = ah->av->hop_limit;
 284                 header->grh.source_gid = ah->ibah.sgid_attr->gid;
 285                 memcpy(header->grh.destination_gid.raw,
 286                        ah->av->dgid, 16);
 287         }
 288
 289         return 0;
 290 }
 291
 292 int mthca_ah_query(struct ib_ah *ibah, struct rdma_ah_attr *attr)
 293 {
 294         struct mthca_ah *ah   = to_mah(ibah);
 295         struct mthca_dev *dev = to_mdev(ibah->device);
 296         u8 port_num = be32_to_cpu(ah->av->port_pd) >> 24;
 297
 298         /* Only implement for MAD and memfree ah for now. */
 299         if (ah->type == MTHCA_AH_ON_HCA)
 300                 return -ENOSYS;
 301
 302         memset(attr, 0, sizeof *attr);
 303         attr->type = ibah->type;
 304         rdma_ah_set_dlid(attr, be16_to_cpu(ah->av->dlid));
 305         rdma_ah_set_sl(attr, be32_to_cpu(ah->av->sl_tclass_flowlabel) >> 28);
 306         rdma_ah_set_port_num(attr, port_num);
 307         rdma_ah_set_static_rate(attr,
 308                                 mthca_rate_to_ib(dev, ah->av->msg_sr & 0x7,
 309                                                  port_num));
 310         rdma_ah_set_path_bits(attr, ah->av->g_slid & 0x7F);
 311         if (mthca_ah_grh_present(ah)) {
 312                 u32 tc_fl = be32_to_cpu(ah->av->sl_tclass_flowlabel);
 313
 314                 rdma_ah_set_grh(attr, NULL,
 315                                 tc_fl & 0xfffff,
 316                                 ah->av->gid_index &
 317                                 (dev->limits.gid_table_len - 1),
 318                                 ah->av->hop_limit,
 319                                 (tc_fl >> 20) & 0xff);
 320                 rdma_ah_set_dgid_raw(attr, ah->av->dgid);
 321         }
 322
 323         return 0;
 324 }
 325
 326 int mthca_init_av_table(struct mthca_dev *dev)
 327 {
 328         int err;
 329
 330         if (mthca_is_memfree(dev))
 331                 return 0;
 332
 333         err = mthca_alloc_init(&dev->av_table.alloc,
 334                                dev->av_table.num_ddr_avs,
 335                                dev->av_table.num_ddr_avs - 1,
 336                                0);
 337         if (err)
 338                 return err;
 339
 340         dev->av_table.pool = dma_pool_create("mthca_av", &dev->pdev->dev,
 341                                              MTHCA_AV_SIZE,
 342                                              MTHCA_AV_SIZE, 0);
 343         if (!dev->av_table.pool)
 344                 goto out_free_alloc;
 345
 346         if (!(dev->mthca_flags & MTHCA_FLAG_DDR_HIDDEN)) {
 347                 dev->av_table.av_map = ioremap(pci_resource_start(dev->pdev, 4) +
 348                                                dev->av_table.ddr_av_base -
 349                                                dev->ddr_start,
 350                                                dev->av_table.num_ddr_avs *
 351                                                MTHCA_AV_SIZE);
 352                 if (!dev->av_table.av_map)
 353                         goto out_free_pool;
 354         } else
 355                 dev->av_table.av_map = NULL;
 356
 357         return 0;
 358
 359  out_free_pool:
 360         dma_pool_destroy(dev->av_table.pool);
 361
 362  out_free_alloc:
 363         mthca_alloc_cleanup(&dev->av_table.alloc);
 364         return -ENOMEM;
 365 }
 366
 367 void mthca_cleanup_av_table(struct mthca_dev *dev)
 368 {
 369         if (mthca_is_memfree(dev))
 370                 return;
 371
 372         if (dev->av_table.av_map)
 373                 iounmap(dev->av_table.av_map);
 374         dma_pool_destroy(dev->av_table.pool);
 375         mthca_alloc_cleanup(&dev->av_table.alloc);
 376 }