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/gfp.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 %pI6 is %04x\n", gid, *hash);
  91
  92         *index = *hash;
  93         *prev  = -1;
  94
  95         do {
  96                 err = mthca_READ_MGM(dev, *index, mgm_mailbox, &status);
  97                 if (err)
  98                         goto out;
  99                 if (status) {
 100                         mthca_err(dev, "READ_MGM returned status %02x\n", status);
 101                         err = -EINVAL;
 102                         goto out;
 103                 }
 104
 105                 if (!memcmp(mgm->gid, zero_gid, 16)) {
 106                         if (*index != *hash) {
 107                                 mthca_err(dev, "Found zero MGID in AMGM.\n");
 108                                 err = -EINVAL;
 109                         }
 110                         goto out;
 111                 }
 112
 113                 if (!memcmp(mgm->gid, gid, 16))
 114                         goto out;
 115
 116                 *prev = *index;
 117                 *index = be32_to_cpu(mgm->next_gid_index) >> 6;
 118         } while (*index);
 119
 120         *index = -1;
 121
 122  out:
 123         mthca_free_mailbox(dev, mailbox);
 124         return err;
 125 }
 126
 127 int mthca_multicast_attach(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
 128 {
 129         struct mthca_dev *dev = to_mdev(ibqp->device);
 130         struct mthca_mailbox *mailbox;
 131         struct mthca_mgm *mgm;
 132         u16 hash;
 133         int index, prev;
 134         int link = 0;
 135         int i;
 136         int err;
 137         u8 status;
 138
 139         mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
 140         if (IS_ERR(mailbox))
 141                 return PTR_ERR(mailbox);
 142         mgm = mailbox->buf;
 143
 144         mutex_lock(&dev->mcg_table.mutex);
 145
 146         err = find_mgm(dev, gid->raw, mailbox, &hash, &prev, &index);
 147         if (err)
 148                 goto out;
 149
 150         if (index != -1) {
 151                 if (!memcmp(mgm->gid, zero_gid, 16))
 152                         memcpy(mgm->gid, gid->raw, 16);
 153         } else {
 154                 link = 1;
 155
 156                 index = mthca_alloc(&dev->mcg_table.alloc);
 157                 if (index == -1) {
 158                         mthca_err(dev, "No AMGM entries left\n");
 159                         err = -ENOMEM;
 160                         goto out;
 161                 }
 162
 163                 err = mthca_READ_MGM(dev, index, mailbox, &status);
 164                 if (err)
 165                         goto out;
 166                 if (status) {
 167                         mthca_err(dev, "READ_MGM returned status %02x\n", status);
 168                         err = -EINVAL;
 169                         goto out;
 170                 }
 171                 memset(mgm, 0, sizeof *mgm);
 172                 memcpy(mgm->gid, gid->raw, 16);
 173         }
 174
 175         for (i = 0; i < MTHCA_QP_PER_MGM; ++i)
 176                 if (mgm->qp[i] == cpu_to_be32(ibqp->qp_num | (1 << 31))) {
 177                         mthca_dbg(dev, "QP %06x already a member of MGM\n",
 178                                   ibqp->qp_num);
 179                         err = 0;
 180                         goto out;
 181                 } else if (!(mgm->qp[i] & cpu_to_be32(1 << 31))) {
 182                         mgm->qp[i] = cpu_to_be32(ibqp->qp_num | (1 << 31));
 183                         break;
 184                 }
 185
 186         if (i == MTHCA_QP_PER_MGM) {
 187                 mthca_err(dev, "MGM at index %x is full.\n", index);
 188                 err = -ENOMEM;
 189                 goto out;
 190         }
 191
 192         err = mthca_WRITE_MGM(dev, index, mailbox, &status);
 193         if (err)
 194                 goto out;
 195         if (status) {
 196                 mthca_err(dev, "WRITE_MGM returned status %02x\n", status);
 197                 err = -EINVAL;
 198                 goto out;
 199         }
 200
 201         if (!link)
 202                 goto out;
 203
 204         err = mthca_READ_MGM(dev, prev, mailbox, &status);
 205         if (err)
 206                 goto out;
 207         if (status) {
 208                 mthca_err(dev, "READ_MGM returned status %02x\n", status);
 209                 err = -EINVAL;
 210                 goto out;
 211         }
 212
 213         mgm->next_gid_index = cpu_to_be32(index << 6);
 214
 215         err = mthca_WRITE_MGM(dev, prev, mailbox, &status);
 216         if (err)
 217                 goto out;
 218         if (status) {
 219                 mthca_err(dev, "WRITE_MGM returned status %02x\n", status);
 220                 err = -EINVAL;
 221         }
 222
 223  out:
 224         if (err && link && index != -1) {
 225                 BUG_ON(index < dev->limits.num_mgms);
 226                 mthca_free(&dev->mcg_table.alloc, index);
 227         }
 228         mutex_unlock(&dev->mcg_table.mutex);
 229
 230         mthca_free_mailbox(dev, mailbox);
 231         return err;
 232 }
 233
 234 int mthca_multicast_detach(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
 235 {
 236         struct mthca_dev *dev = to_mdev(ibqp->device);
 237         struct mthca_mailbox *mailbox;
 238         struct mthca_mgm *mgm;
 239         u16 hash;
 240         int prev, index;
 241         int i, loc;
 242         int err;
 243         u8 status;
 244
 245         mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
 246         if (IS_ERR(mailbox))
 247                 return PTR_ERR(mailbox);
 248         mgm = mailbox->buf;
 249
 250         mutex_lock(&dev->mcg_table.mutex);
 251
 252         err = find_mgm(dev, gid->raw, mailbox, &hash, &prev, &index);
 253         if (err)
 254                 goto out;
 255
 256         if (index == -1) {
 257                 mthca_err(dev, "MGID %pI6 not found\n", gid->raw);
 258                 err = -EINVAL;
 259                 goto out;
 260         }
 261
 262         for (loc = -1, i = 0; i < MTHCA_QP_PER_MGM; ++i) {
 263                 if (mgm->qp[i] == cpu_to_be32(ibqp->qp_num | (1 << 31)))
 264                         loc = i;
 265                 if (!(mgm->qp[i] & cpu_to_be32(1 << 31)))
 266                         break;
 267         }
 268
 269         if (loc == -1) {
 270                 mthca_err(dev, "QP %06x not found in MGM\n", ibqp->qp_num);
 271                 err = -EINVAL;
 272                 goto out;
 273         }
 274
 275         mgm->qp[loc]   = mgm->qp[i - 1];
 276         mgm->qp[i - 1] = 0;
 277
 278         err = mthca_WRITE_MGM(dev, index, mailbox, &status);
 279         if (err)
 280                 goto out;
 281         if (status) {
 282                 mthca_err(dev, "WRITE_MGM returned status %02x\n", status);
 283                 err = -EINVAL;
 284                 goto out;
 285         }
 286
 287         if (i != 1)
 288                 goto out;
 289
 290         if (prev == -1) {
 291                 /* Remove entry from MGM */
 292                 int amgm_index_to_free = be32_to_cpu(mgm->next_gid_index) >> 6;
 293                 if (amgm_index_to_free) {
 294                         err = mthca_READ_MGM(dev, amgm_index_to_free,
 295                                              mailbox, &status);
 296                         if (err)
 297                                 goto out;
 298                         if (status) {
 299                                 mthca_err(dev, "READ_MGM returned status %02x\n",
 300                                           status);
 301                                 err = -EINVAL;
 302                                 goto out;
 303                         }
 304                 } else
 305                         memset(mgm->gid, 0, 16);
 306
 307                 err = mthca_WRITE_MGM(dev, index, mailbox, &status);
 308                 if (err)
 309                         goto out;
 310                 if (status) {
 311                         mthca_err(dev, "WRITE_MGM returned status %02x\n", status);
 312                         err = -EINVAL;
 313                         goto out;
 314                 }
 315                 if (amgm_index_to_free) {
 316                         BUG_ON(amgm_index_to_free < dev->limits.num_mgms);
 317                         mthca_free(&dev->mcg_table.alloc, amgm_index_to_free);
 318                 }
 319         } else {
 320                 /* Remove entry from AMGM */
 321                 int curr_next_index = be32_to_cpu(mgm->next_gid_index) >> 6;
 322                 err = mthca_READ_MGM(dev, prev, mailbox, &status);
 323                 if (err)
 324                         goto out;
 325                 if (status) {
 326                         mthca_err(dev, "READ_MGM returned status %02x\n", status);
 327                         err = -EINVAL;
 328                         goto out;
 329                 }
 330
 331                 mgm->next_gid_index = cpu_to_be32(curr_next_index << 6);
 332
 333                 err = mthca_WRITE_MGM(dev, prev, mailbox, &status);
 334                 if (err)
 335                         goto out;
 336                 if (status) {
 337                         mthca_err(dev, "WRITE_MGM returned status %02x\n", status);
 338                         err = -EINVAL;
 339                         goto out;
 340                 }
 341                 BUG_ON(index < dev->limits.num_mgms);
 342                 mthca_free(&dev->mcg_table.alloc, index);
 343         }
 344
 345  out:
 346         mutex_unlock(&dev->mcg_table.mutex);
 347
 348         mthca_free_mailbox(dev, mailbox);
 349         return err;
 350 }
 351
 352 int mthca_init_mcg_table(struct mthca_dev *dev)
 353 {
 354         int err;
 355         int table_size = dev->limits.num_mgms + dev->limits.num_amgms;
 356
 357         err = mthca_alloc_init(&dev->mcg_table.alloc,
 358                                table_size,
 359                                table_size - 1,
 360                                dev->limits.num_mgms);
 361         if (err)
 362                 return err;
 363
 364         mutex_init(&dev->mcg_table.mutex);
 365
 366         return 0;
 367 }
 368
 369 void mthca_cleanup_mcg_table(struct mthca_dev *dev)
 370 {
 371         mthca_alloc_cleanup(&dev->mcg_table.alloc);
 372 }