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 struct mthca_mgm {
  41         __be32 next_gid_index;
  42         u32    reserved[3];
  43         u8     gid[16];
  44         __be32 qp[MTHCA_QP_PER_MGM];
  45 };
  46
  47 static const u8 zero_gid[16];   /* automatically initialized to 0 */
  48
  49 /*
  50  * Caller must hold MCG table semaphore.  gid and mgm parameters must
  51  * be properly aligned for command interface.
  52  *
  53  *  Returns 0 unless a firmware command error occurs.
  54  *
  55  * If GID is found in MGM or MGM is empty, *index = *hash, *prev = -1
  56  * and *mgm holds MGM entry.
  57  *
  58  * if GID is found in AMGM, *index = index in AMGM, *prev = index of
  59  * previous entry in hash chain and *mgm holds AMGM entry.
  60  *
  61  * If no AMGM exists for given gid, *index = -1, *prev = index of last
  62  * entry in hash chain and *mgm holds end of hash chain.
  63  */
  64 static int find_mgm(struct mthca_dev *dev,
  65                     u8 *gid, struct mthca_mailbox *mgm_mailbox,
  66                     u16 *hash, int *prev, int *index)
  67 {
  68         struct mthca_mailbox *mailbox;
  69         struct mthca_mgm *mgm = mgm_mailbox->buf;
  70         u8 *mgid;
  71         int err;
  72         u8 status;
  73
  74         mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
  75         if (IS_ERR(mailbox))
  76                 return -ENOMEM;
  77         mgid = mailbox->buf;
  78
  79         memcpy(mgid, gid, 16);
  80
  81         err = mthca_MGID_HASH(dev, mailbox, hash, &status);
  82         if (err)
  83                 goto out;
  84         if (status) {
  85                 mthca_err(dev, "MGID_HASH returned status %02x\n", status);
  86                 err = -EINVAL;
  87                 goto out;
  88         }
  89
  90         if (0)
  91                 mthca_dbg(dev, "Hash for %04x:%04x:%04x:%04x:"
  92                           "%04x:%04x:%04x:%04x is %04x\n",
  93                           be16_to_cpu(((__be16 *) gid)[0]),
  94                           be16_to_cpu(((__be16 *) gid)[1]),
  95                           be16_to_cpu(((__be16 *) gid)[2]),
  96                           be16_to_cpu(((__be16 *) gid)[3]),
  97                           be16_to_cpu(((__be16 *) gid)[4]),
  98                           be16_to_cpu(((__be16 *) gid)[5]),
  99                           be16_to_cpu(((__be16 *) gid)[6]),
 100                           be16_to_cpu(((__be16 *) gid)[7]),
 101                           *hash);
 102
 103         *index = *hash;
 104         *prev  = -1;
 105
 106         do {
 107                 err = mthca_READ_MGM(dev, *index, mgm_mailbox, &status);
 108                 if (err)
 109                         goto out;
 110                 if (status) {
 111                         mthca_err(dev, "READ_MGM returned status %02x\n", status);
 112                         return -EINVAL;
 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) >> 5;
 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         if (down_interruptible(&dev->mcg_table.sem))
 155                 return -EINTR;
 156
 157         err = find_mgm(dev, gid->raw, mailbox, &hash, &prev, &index);
 158         if (err)
 159                 goto out;
 160
 161         if (index != -1) {
 162                 if (!memcmp(mgm->gid, zero_gid, 16))
 163                         memcpy(mgm->gid, gid->raw, 16);
 164         } else {
 165                 link = 1;
 166
 167                 index = mthca_alloc(&dev->mcg_table.alloc);
 168                 if (index == -1) {
 169                         mthca_err(dev, "No AMGM entries left\n");
 170                         err = -ENOMEM;
 171                         goto out;
 172                 }
 173
 174                 err = mthca_READ_MGM(dev, index, mailbox, &status);
 175                 if (err)
 176                         goto out;
 177                 if (status) {
 178                         mthca_err(dev, "READ_MGM returned status %02x\n", status);
 179                         err = -EINVAL;
 180                         goto out;
 181                 }
 182
 183                 memcpy(mgm->gid, gid->raw, 16);
 184                 mgm->next_gid_index = 0;
 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         }
 211
 212         if (!link)
 213                 goto out;
 214
 215         err = mthca_READ_MGM(dev, prev, mailbox, &status);
 216         if (err)
 217                 goto out;
 218         if (status) {
 219                 mthca_err(dev, "READ_MGM returned status %02x\n", status);
 220                 err = -EINVAL;
 221                 goto out;
 222         }
 223
 224         mgm->next_gid_index = cpu_to_be32(index << 5);
 225
 226         err = mthca_WRITE_MGM(dev, prev, mailbox, &status);
 227         if (err)
 228                 goto out;
 229         if (status) {
 230                 mthca_err(dev, "WRITE_MGM returned status %02x\n", status);
 231                 err = -EINVAL;
 232         }
 233
 234  out:
 235         up(&dev->mcg_table.sem);
 236         mthca_free_mailbox(dev, mailbox);
 237         return err;
 238 }
 239
 240 int mthca_multicast_detach(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
 241 {
 242         struct mthca_dev *dev = to_mdev(ibqp->device);
 243         struct mthca_mailbox *mailbox;
 244         struct mthca_mgm *mgm;
 245         u16 hash;
 246         int prev, index;
 247         int i, loc;
 248         int err;
 249         u8 status;
 250
 251         mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
 252         if (IS_ERR(mailbox))
 253                 return PTR_ERR(mailbox);
 254         mgm = mailbox->buf;
 255
 256         if (down_interruptible(&dev->mcg_table.sem))
 257                 return -EINTR;
 258
 259         err = find_mgm(dev, gid->raw, mailbox, &hash, &prev, &index);
 260         if (err)
 261                 goto out;
 262
 263         if (index == -1) {
 264                 mthca_err(dev, "MGID %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x "
 265                           "not found\n",
 266                           be16_to_cpu(((__be16 *) gid->raw)[0]),
 267                           be16_to_cpu(((__be16 *) gid->raw)[1]),
 268                           be16_to_cpu(((__be16 *) gid->raw)[2]),
 269                           be16_to_cpu(((__be16 *) gid->raw)[3]),
 270                           be16_to_cpu(((__be16 *) gid->raw)[4]),
 271                           be16_to_cpu(((__be16 *) gid->raw)[5]),
 272                           be16_to_cpu(((__be16 *) gid->raw)[6]),
 273                           be16_to_cpu(((__be16 *) gid->raw)[7]));
 274                 err = -EINVAL;
 275                 goto out;
 276         }
 277
 278         for (loc = -1, i = 0; i < MTHCA_QP_PER_MGM; ++i) {
 279                 if (mgm->qp[i] == cpu_to_be32(ibqp->qp_num | (1 << 31)))
 280                         loc = i;
 281                 if (!(mgm->qp[i] & cpu_to_be32(1 << 31)))
 282                         break;
 283         }
 284
 285         if (loc == -1) {
 286                 mthca_err(dev, "QP %06x not found in MGM\n", ibqp->qp_num);
 287                 err = -EINVAL;
 288                 goto out;
 289         }
 290
 291         mgm->qp[loc]   = mgm->qp[i - 1];
 292         mgm->qp[i - 1] = 0;
 293
 294         err = mthca_WRITE_MGM(dev, index, mailbox, &status);
 295         if (err)
 296                 goto out;
 297         if (status) {
 298                 mthca_err(dev, "WRITE_MGM returned status %02x\n", status);
 299                 err = -EINVAL;
 300                 goto out;
 301         }
 302
 303         if (i != 1)
 304                 goto out;
 305
 306         goto out;
 307
 308         if (prev == -1) {
 309                 /* Remove entry from MGM */
 310                 if (be32_to_cpu(mgm->next_gid_index) >> 5) {
 311                         err = mthca_READ_MGM(dev,
 312                                              be32_to_cpu(mgm->next_gid_index) >> 5,
 313                                              mailbox, &status);
 314                         if (err)
 315                                 goto out;
 316                         if (status) {
 317                                 mthca_err(dev, "READ_MGM returned status %02x\n",
 318                                           status);
 319                                 err = -EINVAL;
 320                                 goto out;
 321                         }
 322                 } else
 323                         memset(mgm->gid, 0, 16);
 324
 325                 err = mthca_WRITE_MGM(dev, index, mailbox, &status);
 326                 if (err)
 327                         goto out;
 328                 if (status) {
 329                         mthca_err(dev, "WRITE_MGM returned status %02x\n", status);
 330                         err = -EINVAL;
 331                         goto out;
 332                 }
 333         } else {
 334                 /* Remove entry from AMGM */
 335                 index = be32_to_cpu(mgm->next_gid_index) >> 5;
 336                 err = mthca_READ_MGM(dev, prev, mailbox, &status);
 337                 if (err)
 338                         goto out;
 339                 if (status) {
 340                         mthca_err(dev, "READ_MGM returned status %02x\n", status);
 341                         err = -EINVAL;
 342                         goto out;
 343                 }
 344
 345                 mgm->next_gid_index = cpu_to_be32(index << 5);
 346
 347                 err = mthca_WRITE_MGM(dev, prev, mailbox, &status);
 348                 if (err)
 349                         goto out;
 350                 if (status) {
 351                         mthca_err(dev, "WRITE_MGM returned status %02x\n", status);
 352                         err = -EINVAL;
 353                         goto out;
 354                 }
 355         }
 356
 357  out:
 358         up(&dev->mcg_table.sem);
 359         mthca_free_mailbox(dev, mailbox);
 360         return err;
 361 }
 362
 363 int __devinit mthca_init_mcg_table(struct mthca_dev *dev)
 364 {
 365         int err;
 366
 367         err = mthca_alloc_init(&dev->mcg_table.alloc,
 368                                dev->limits.num_amgms,
 369                                dev->limits.num_amgms - 1,
 370                                0);
 371         if (err)
 372                 return err;
 373
 374         init_MUTEX(&dev->mcg_table.sem);
 375
 376         return 0;
 377 }
 378
 379 void __devexit mthca_cleanup_mcg_table(struct mthca_dev *dev)
 380 {
 381         mthca_alloc_cleanup(&dev->mcg_table.alloc);
 382 }