drivers/infiniband/hw/mthca/mthca_mcg.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_mcg.c 1349 2004-12-16 21:09:43Z roland $
  33  */
  34
  35 #include <linux/string.h>
  36 #include <linux/slab.h>
  37
  38 #include "mthca_dev.h"
  39 #include "mthca_cmd.h"
  40
  41 struct mthca_mgm {
  42         __be32 next_gid_index;
  43         u32    reserved[3];
  44         u8     gid[16];
  45         __be32 qp[MTHCA_QP_PER_MGM];
  46 };
  47
  48 static const u8 zero_gid[16];   /* automatically initialized to 0 */
  49
  50 /*
  51  * Caller must hold MCG table semaphore.  gid and mgm parameters must
  52  * be properly aligned for command interface.
  53  *
  54  *  Returns 0 unless a firmware command error occurs.
  55  *
  56  * If GID is found in MGM or MGM is empty, *index = *hash, *prev = -1
  57  * and *mgm holds MGM entry.
  58  *
  59  * if GID is found in AMGM, *index = index in AMGM, *prev = index of
  60  * previous entry in hash chain and *mgm holds AMGM entry.
  61  *
  62  * If no AMGM exists for given gid, *index = -1, *prev = index of last
  63  * entry in hash chain and *mgm holds end of hash chain.
  64  */
  65 static int find_mgm(struct mthca_dev *dev,
  66                     u8 *gid, struct mthca_mailbox *mgm_mailbox,
  67                     u16 *hash, int *prev, int *index)
  68 {
  69         struct mthca_mailbox *mailbox;
  70         struct mthca_mgm *mgm = mgm_mailbox->buf;
  71         u8 *mgid;
  72         int err;
  73         u8 status;
  74
  75         mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
  76         if (IS_ERR(mailbox))
  77                 return -ENOMEM;
  78         mgid = mailbox->buf;
  79
  80         memcpy(mgid, gid, 16);
  81
  82         err = mthca_MGID_HASH(dev, mailbox, hash, &status);
  83         if (err)
  84                 goto out;
  85         if (status) {
  86                 mthca_err(dev, "MGID_HASH returned status %02x\n", status);
  87                 err = -EINVAL;
  88                 goto out;
  89         }
  90
  91         if (0)
  92                 mthca_dbg(dev, "Hash for %04x:%04x:%04x:%04x:"
  93                           "%04x:%04x:%04x:%04x is %04x\n",
  94                           be16_to_cpu(((__be16 *) gid)[0]),
  95                           be16_to_cpu(((__be16 *) gid)[1]),
  96                           be16_to_cpu(((__be16 *) gid)[2]),
  97                           be16_to_cpu(((__be16 *) gid)[3]),
  98                           be16_to_cpu(((__be16 *) gid)[4]),
  99                           be16_to_cpu(((__be16 *) gid)[5]),
 100                           be16_to_cpu(((__be16 *) gid)[6]),
 101                           be16_to_cpu(((__be16 *) gid)[7]),
 102                           *hash);
 103
 104         *index = *hash;
 105         *prev  = -1;
 106
 107         do {
 108                 err = mthca_READ_MGM(dev, *index, mgm_mailbox, &status);
 109                 if (err)
 110                         goto out;
 111                 if (status) {
 112                         mthca_err(dev, "READ_MGM returned status %02x\n", status);
 113                         err = -EINVAL;
 114                         goto out;
 115                 }
 116
 117                 if (!memcmp(mgm->gid, zero_gid, 16)) {
 118                         if (*index != *hash) {
 119                                 mthca_err(dev, "Found zero MGID in AMGM.\n");
 120                                 err = -EINVAL;
 121                         }
 122                         goto out;
 123                 }
 124
 125                 if (!memcmp(mgm->gid, gid, 16))
 126                         goto out;
 127
 128                 *prev = *index;
 129                 *index = be32_to_cpu(mgm->next_gid_index) >> 6;
 130         } while (*index);
 131
 132         *index = -1;
 133
 134  out:
 135         mthca_free_mailbox(dev, mailbox);
 136         return err;
 137 }
 138
 139 int mthca_multicast_attach(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
 140 {
 141         struct mthca_dev *dev = to_mdev(ibqp->device);
 142         struct mthca_mailbox *mailbox;
 143         struct mthca_mgm *mgm;
 144         u16 hash;
 145         int index, prev;
 146         int link = 0;
 147         int i;
 148         int err;
 149         u8 status;
 150
 151         mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
 152         if (IS_ERR(mailbox))
 153                 return PTR_ERR(mailbox);
 154         mgm = mailbox->buf;
 155
 156         mutex_lock(&dev->mcg_table.mutex);
 157
 158         err = find_mgm(dev, gid->raw, mailbox, &hash, &prev, &index);
 159         if (err)
 160                 goto out;
 161
 162         if (index != -1) {
 163                 if (!memcmp(mgm->gid, zero_gid, 16))
 164                         memcpy(mgm->gid, gid->raw, 16);
 165         } else {
 166                 link = 1;
 167
 168                 index = mthca_alloc(&dev->mcg_table.alloc);
 169                 if (index == -1) {
 170                         mthca_err(dev, "No AMGM entries left\n");
 171                         err = -ENOMEM;
 172                         goto out;
 173                 }
 174
 175                 err = mthca_READ_MGM(dev, index, mailbox, &status);
 176                 if (err)
 177                         goto out;
 178                 if (status) {
 179                         mthca_err(dev, "READ_MGM returned status %02x\n", status);
 180                         err = -EINVAL;
 181                         goto out;
 182                 }
 183                 memset(mgm, 0, sizeof *mgm);
 184                 memcpy(mgm->gid, gid->raw, 16);
 185         }
 186
 187         for (i = 0; i < MTHCA_QP_PER_MGM; ++i)
 188                 if (mgm->qp[i] == cpu_to_be32(ibqp->qp_num | (1 << 31))) {
 189                         mthca_dbg(dev, "QP %06x already a member of MGM\n",
 190                                   ibqp->qp_num);
 191                         err = 0;
 192                         goto out;
 193                 } else if (!(mgm->qp[i] & cpu_to_be32(1 << 31))) {
 194                         mgm->qp[i] = cpu_to_be32(ibqp->qp_num | (1 << 31));
 195                         break;
 196                 }
 197
 198         if (i == MTHCA_QP_PER_MGM) {
 199                 mthca_err(dev, "MGM at index %x is full.\n", index);
 200                 err = -ENOMEM;
 201                 goto out;
 202         }
 203
 204         err = mthca_WRITE_MGM(dev, index, mailbox, &status);
 205         if (err)
 206                 goto out;
 207         if (status) {
 208                 mthca_err(dev, "WRITE_MGM returned status %02x\n", status);
 209                 err = -EINVAL;
 210                 goto out;
 211         }
 212
 213         if (!link)
 214                 goto out;
 215
 216         err = mthca_READ_MGM(dev, prev, mailbox, &status);
 217         if (err)
 218                 goto out;
 219         if (status) {
 220                 mthca_err(dev, "READ_MGM returned status %02x\n", status);
 221                 err = -EINVAL;
 222                 goto out;
 223         }
 224
 225         mgm->next_gid_index = cpu_to_be32(index << 6);
 226
 227         err = mthca_WRITE_MGM(dev, prev, mailbox, &status);
 228         if (err)
 229                 goto out;
 230         if (status) {
 231                 mthca_err(dev, "WRITE_MGM returned status %02x\n", status);
 232                 err = -EINVAL;
 233         }
 234
 235  out:
 236         if (err && link && index != -1) {
 237                 BUG_ON(index < dev->limits.num_mgms);
 238                 mthca_free(&dev->mcg_table.alloc, index);
 239         }
 240         mutex_unlock(&dev->mcg_table.mutex);
 241
 242         mthca_free_mailbox(dev, mailbox);
 243         return err;
 244 }
 245
 246 int mthca_multicast_detach(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
 247 {
 248         struct mthca_dev *dev = to_mdev(ibqp->device);
 249         struct mthca_mailbox *mailbox;
 250         struct mthca_mgm *mgm;
 251         u16 hash;
 252         int prev, index;
 253         int i, loc;
 254         int err;
 255         u8 status;
 256
 257         mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
 258         if (IS_ERR(mailbox))
 259                 return PTR_ERR(mailbox);
 260         mgm = mailbox->buf;
 261
 262         mutex_lock(&dev->mcg_table.mutex);
 263
 264         err = find_mgm(dev, gid->raw, mailbox, &hash, &prev, &index);
 265         if (err)
 266                 goto out;
 267
 268         if (index == -1) {
 269                 mthca_err(dev, "MGID %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x "
 270                           "not found\n",
 271                           be16_to_cpu(((__be16 *) gid->raw)[0]),
 272                           be16_to_cpu(((__be16 *) gid->raw)[1]),
 273                           be16_to_cpu(((__be16 *) gid->raw)[2]),
 274                           be16_to_cpu(((__be16 *) gid->raw)[3]),
 275                           be16_to_cpu(((__be16 *) gid->raw)[4]),
 276                           be16_to_cpu(((__be16 *) gid->raw)[5]),
 277                           be16_to_cpu(((__be16 *) gid->raw)[6]),
 278                           be16_to_cpu(((__be16 *) gid->raw)[7]));
 279                 err = -EINVAL;
 280                 goto out;
 281         }
 282
 283         for (loc = -1, i = 0; i < MTHCA_QP_PER_MGM; ++i) {
 284                 if (mgm->qp[i] == cpu_to_be32(ibqp->qp_num | (1 << 31)))
 285                         loc = i;
 286                 if (!(mgm->qp[i] & cpu_to_be32(1 << 31)))
 287                         break;
 288         }
 289
 290         if (loc == -1) {
 291                 mthca_err(dev, "QP %06x not found in MGM\n", ibqp->qp_num);
 292                 err = -EINVAL;
 293                 goto out;
 294         }
 295
 296         mgm->qp[loc]   = mgm->qp[i - 1];
 297         mgm->qp[i - 1] = 0;
 298
 299         err = mthca_WRITE_MGM(dev, index, mailbox, &status);
 300         if (err)
 301                 goto out;
 302         if (status) {
 303                 mthca_err(dev, "WRITE_MGM returned status %02x\n", status);
 304                 err = -EINVAL;
 305                 goto out;
 306         }
 307
 308         if (i != 1)
 309                 goto out;
 310
 311         if (prev == -1) {
 312                 /* Remove entry from MGM */
 313                 int amgm_index_to_free = be32_to_cpu(mgm->next_gid_index) >> 6;
 314                 if (amgm_index_to_free) {
 315                         err = mthca_READ_MGM(dev, amgm_index_to_free,
 316                                              mailbox, &status);
 317                         if (err)
 318                                 goto out;
 319                         if (status) {
 320                                 mthca_err(dev, "READ_MGM returned status %02x\n",
 321                                           status);
 322                                 err = -EINVAL;
 323                                 goto out;
 324                         }
 325                 } else
 326                         memset(mgm->gid, 0, 16);
 327
 328                 err = mthca_WRITE_MGM(dev, index, mailbox, &status);
 329                 if (err)
 330                         goto out;
 331                 if (status) {
 332                         mthca_err(dev, "WRITE_MGM returned status %02x\n", status);
 333                         err = -EINVAL;
 334                         goto out;
 335                 }
 336                 if (amgm_index_to_free) {
 337                         BUG_ON(amgm_index_to_free < dev->limits.num_mgms);
 338                         mthca_free(&dev->mcg_table.alloc, amgm_index_to_free);
 339                 }
 340         } else {
 341                 /* Remove entry from AMGM */
 342                 int curr_next_index = be32_to_cpu(mgm->next_gid_index) >> 6;
 343                 err = mthca_READ_MGM(dev, prev, mailbox, &status);
 344                 if (err)
 345                         goto out;
 346                 if (status) {
 347                         mthca_err(dev, "READ_MGM returned status %02x\n", status);
 348                         err = -EINVAL;
 349                         goto out;
 350                 }
 351
 352                 mgm->next_gid_index = cpu_to_be32(curr_next_index << 6);
 353
 354                 err = mthca_WRITE_MGM(dev, prev, mailbox, &status);
 355                 if (err)
 356                         goto out;
 357                 if (status) {
 358                         mthca_err(dev, "WRITE_MGM returned status %02x\n", status);
 359                         err = -EINVAL;
 360                         goto out;
 361                 }
 362                 BUG_ON(index < dev->limits.num_mgms);
 363                 mthca_free(&dev->mcg_table.alloc, index);
 364         }
 365
 366  out:
 367         mutex_unlock(&dev->mcg_table.mutex);
 368
 369         mthca_free_mailbox(dev, mailbox);
 370         return err;
 371 }
 372
 373 int mthca_init_mcg_table(struct mthca_dev *dev)
 374 {
 375         int err;
 376         int table_size = dev->limits.num_mgms + dev->limits.num_amgms;
 377
 378         err = mthca_alloc_init(&dev->mcg_table.alloc,
 379                                table_size,
 380                                table_size - 1,
 381                                dev->limits.num_mgms);
 382         if (err)
 383                 return err;
 384
 385         mutex_init(&dev->mcg_table.mutex);
 386
 387         return 0;
 388 }
 389
 390 void mthca_cleanup_mcg_table(struct mthca_dev *dev)
 391 {
 392         mthca_alloc_cleanup(&dev->mcg_table.alloc);
 393 }