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         __be32 next_gid_index;
  46         u32    reserved[3];
  47         u8     gid[16];
  48         __be32 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_mailbox *mgm_mailbox,
  70                     u16 *hash, int *prev, int *index)
  71 {
  72         struct mthca_mailbox *mailbox;
  73         struct mthca_mgm *mgm = mgm_mailbox->buf;
  74         u8 *mgid;
  75         int err;
  76         u8 status;
  77
  78         mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
  79         if (IS_ERR(mailbox))
  80                 return -ENOMEM;
  81         mgid = mailbox->buf;
  82
  83         memcpy(mgid, gid, 16);
  84
  85         err = mthca_MGID_HASH(dev, mailbox, hash, &status);
  86         if (err)
  87                 goto out;
  88         if (status) {
  89                 mthca_err(dev, "MGID_HASH returned status %02x\n", status);
  90                 err = -EINVAL;
  91                 goto out;
  92         }
  93
  94         if (0)
  95                 mthca_dbg(dev, "Hash for %04x:%04x:%04x:%04x:"
  96                           "%04x:%04x:%04x:%04x is %04x\n",
  97                           be16_to_cpu(((__be16 *) gid)[0]),
  98                           be16_to_cpu(((__be16 *) gid)[1]),
  99                           be16_to_cpu(((__be16 *) gid)[2]),
 100                           be16_to_cpu(((__be16 *) gid)[3]),
 101                           be16_to_cpu(((__be16 *) gid)[4]),
 102                           be16_to_cpu(((__be16 *) gid)[5]),
 103                           be16_to_cpu(((__be16 *) gid)[6]),
 104                           be16_to_cpu(((__be16 *) gid)[7]),
 105                           *hash);
 106
 107         *index = *hash;
 108         *prev  = -1;
 109
 110         do {
 111                 err = mthca_READ_MGM(dev, *index, mgm_mailbox, &status);
 112                 if (err)
 113                         goto out;
 114                 if (status) {
 115                         mthca_err(dev, "READ_MGM returned status %02x\n", status);
 116                         return -EINVAL;
 117                 }
 118
 119                 if (!memcmp(mgm->gid, zero_gid, 16)) {
 120                         if (*index != *hash) {
 121                                 mthca_err(dev, "Found zero MGID in AMGM.\n");
 122                                 err = -EINVAL;
 123                         }
 124                         goto out;
 125                 }
 126
 127                 if (!memcmp(mgm->gid, gid, 16))
 128                         goto out;
 129
 130                 *prev = *index;
 131                 *index = be32_to_cpu(mgm->next_gid_index) >> 5;
 132         } while (*index);
 133
 134         *index = -1;
 135
 136  out:
 137         mthca_free_mailbox(dev, mailbox);
 138         return err;
 139 }
 140
 141 int mthca_multicast_attach(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
 142 {
 143         struct mthca_dev *dev = to_mdev(ibqp->device);
 144         struct mthca_mailbox *mailbox;
 145         struct mthca_mgm *mgm;
 146         u16 hash;
 147         int index, prev;
 148         int link = 0;
 149         int i;
 150         int err;
 151         u8 status;
 152
 153         mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
 154         if (IS_ERR(mailbox))
 155                 return PTR_ERR(mailbox);
 156         mgm = mailbox->buf;
 157
 158         if (down_interruptible(&dev->mcg_table.sem))
 159                 return -EINTR;
 160
 161         err = find_mgm(dev, gid->raw, mailbox, &hash, &prev, &index);
 162         if (err)
 163                 goto out;
 164
 165         if (index != -1) {
 166                 if (!memcmp(mgm->gid, zero_gid, 16))
 167                         memcpy(mgm->gid, gid->raw, 16);
 168         } else {
 169                 link = 1;
 170
 171                 index = mthca_alloc(&dev->mcg_table.alloc);
 172                 if (index == -1) {
 173                         mthca_err(dev, "No AMGM entries left\n");
 174                         err = -ENOMEM;
 175                         goto out;
 176                 }
 177
 178                 err = mthca_READ_MGM(dev, index, mailbox, &status);
 179                 if (err)
 180                         goto out;
 181                 if (status) {
 182                         mthca_err(dev, "READ_MGM returned status %02x\n", status);
 183                         err = -EINVAL;
 184                         goto out;
 185                 }
 186
 187                 memcpy(mgm->gid, gid->raw, 16);
 188                 mgm->next_gid_index = 0;
 189         }
 190
 191         for (i = 0; i < MTHCA_QP_PER_MGM; ++i)
 192                 if (!(mgm->qp[i] & cpu_to_be32(1 << 31))) {
 193                         mgm->qp[i] = cpu_to_be32(ibqp->qp_num | (1 << 31));
 194                         break;
 195                 }
 196
 197         if (i == MTHCA_QP_PER_MGM) {
 198                 mthca_err(dev, "MGM at index %x is full.\n", index);
 199                 err = -ENOMEM;
 200                 goto out;
 201         }
 202
 203         err = mthca_WRITE_MGM(dev, index, mailbox, &status);
 204         if (err)
 205                 goto out;
 206         if (status) {
 207                 mthca_err(dev, "WRITE_MGM returned status %02x\n", status);
 208                 err = -EINVAL;
 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 << 5);
 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         up(&dev->mcg_table.sem);
 235         mthca_free_mailbox(dev, mailbox);
 236         return err;
 237 }
 238
 239 int mthca_multicast_detach(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
 240 {
 241         struct mthca_dev *dev = to_mdev(ibqp->device);
 242         struct mthca_mailbox *mailbox;
 243         struct mthca_mgm *mgm;
 244         u16 hash;
 245         int prev, index;
 246         int i, loc;
 247         int err;
 248         u8 status;
 249
 250         mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
 251         if (IS_ERR(mailbox))
 252                 return PTR_ERR(mailbox);
 253         mgm = mailbox->buf;
 254
 255         if (down_interruptible(&dev->mcg_table.sem))
 256                 return -EINTR;
 257
 258         err = find_mgm(dev, gid->raw, mailbox, &hash, &prev, &index);
 259         if (err)
 260                 goto out;
 261
 262         if (index == -1) {
 263                 mthca_err(dev, "MGID %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x "
 264                           "not found\n",
 265                           be16_to_cpu(((__be16 *) gid->raw)[0]),
 266                           be16_to_cpu(((__be16 *) gid->raw)[1]),
 267                           be16_to_cpu(((__be16 *) gid->raw)[2]),
 268                           be16_to_cpu(((__be16 *) gid->raw)[3]),
 269                           be16_to_cpu(((__be16 *) gid->raw)[4]),
 270                           be16_to_cpu(((__be16 *) gid->raw)[5]),
 271                           be16_to_cpu(((__be16 *) gid->raw)[6]),
 272                           be16_to_cpu(((__be16 *) gid->raw)[7]));
 273                 err = -EINVAL;
 274                 goto out;
 275         }
 276
 277         for (loc = -1, i = 0; i < MTHCA_QP_PER_MGM; ++i) {
 278                 if (mgm->qp[i] == cpu_to_be32(ibqp->qp_num | (1 << 31)))
 279                         loc = i;
 280                 if (!(mgm->qp[i] & cpu_to_be32(1 << 31)))
 281                         break;
 282         }
 283
 284         if (loc == -1) {
 285                 mthca_err(dev, "QP %06x not found in MGM\n", ibqp->qp_num);
 286                 err = -EINVAL;
 287                 goto out;
 288         }
 289
 290         mgm->qp[loc]   = mgm->qp[i - 1];
 291         mgm->qp[i - 1] = 0;
 292
 293         err = mthca_WRITE_MGM(dev, index, mailbox, &status);
 294         if (err)
 295                 goto out;
 296         if (status) {
 297                 mthca_err(dev, "WRITE_MGM returned status %02x\n", status);
 298                 err = -EINVAL;
 299                 goto out;
 300         }
 301
 302         if (i != 1)
 303                 goto out;
 304
 305         goto out;
 306
 307         if (prev == -1) {
 308                 /* Remove entry from MGM */
 309                 if (be32_to_cpu(mgm->next_gid_index) >> 5) {
 310                         err = mthca_READ_MGM(dev,
 311                                              be32_to_cpu(mgm->next_gid_index) >> 5,
 312                                              mailbox, &status);
 313                         if (err)
 314                                 goto out;
 315                         if (status) {
 316                                 mthca_err(dev, "READ_MGM returned status %02x\n",
 317                                           status);
 318                                 err = -EINVAL;
 319                                 goto out;
 320                         }
 321                 } else
 322                         memset(mgm->gid, 0, 16);
 323
 324                 err = mthca_WRITE_MGM(dev, index, mailbox, &status);
 325                 if (err)
 326                         goto out;
 327                 if (status) {
 328                         mthca_err(dev, "WRITE_MGM returned status %02x\n", status);
 329                         err = -EINVAL;
 330                         goto out;
 331                 }
 332         } else {
 333                 /* Remove entry from AMGM */
 334                 index = be32_to_cpu(mgm->next_gid_index) >> 5;
 335                 err = mthca_READ_MGM(dev, prev, mailbox, &status);
 336                 if (err)
 337                         goto out;
 338                 if (status) {
 339                         mthca_err(dev, "READ_MGM returned status %02x\n", status);
 340                         err = -EINVAL;
 341                         goto out;
 342                 }
 343
 344                 mgm->next_gid_index = cpu_to_be32(index << 5);
 345
 346                 err = mthca_WRITE_MGM(dev, prev, mailbox, &status);
 347                 if (err)
 348                         goto out;
 349                 if (status) {
 350                         mthca_err(dev, "WRITE_MGM returned status %02x\n", status);
 351                         err = -EINVAL;
 352                         goto out;
 353                 }
 354         }
 355
 356  out:
 357         up(&dev->mcg_table.sem);
 358         mthca_free_mailbox(dev, mailbox);
 359         return err;
 360 }
 361
 362 int __devinit mthca_init_mcg_table(struct mthca_dev *dev)
 363 {
 364         int err;
 365
 366         err = mthca_alloc_init(&dev->mcg_table.alloc,
 367                                dev->limits.num_amgms,
 368                                dev->limits.num_amgms - 1,
 369                                0);
 370         if (err)
 371                 return err;
 372
 373         init_MUTEX(&dev->mcg_table.sem);
 374
 375         return 0;
 376 }
 377
 378 void __devexit mthca_cleanup_mcg_table(struct mthca_dev *dev)
 379 {
 380         mthca_alloc_cleanup(&dev->mcg_table.alloc);
 381 }