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