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