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
  72         mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
  73         if (IS_ERR(mailbox))
  74                 return -ENOMEM;
  75         mgid = mailbox->buf;
  76
  77         memcpy(mgid, gid, 16);
  78
  79         err = mthca_MGID_HASH(dev, mailbox, hash);
  80         if (err) {
  81                 mthca_err(dev, "MGID_HASH failed (%d)\n", err);
  82                 goto out;
  83         }
  84
  85         if (0)
  86                 mthca_dbg(dev, "Hash for %pI6 is %04x\n", gid, *hash);
  87
  88         *index = *hash;
  89         *prev  = -1;
  90
  91         do {
  92                 err = mthca_READ_MGM(dev, *index, mgm_mailbox);
  93                 if (err) {
  94                         mthca_err(dev, "READ_MGM failed (%d)\n", err);
  95                         goto out;
  96                 }
  97
  98                 if (!memcmp(mgm->gid, zero_gid, 16)) {
  99                         if (*index != *hash) {
 100                                 mthca_err(dev, "Found zero MGID in AMGM.\n");
 101                                 err = -EINVAL;
 102                         }
 103                         goto out;
 104                 }
 105
 106                 if (!memcmp(mgm->gid, gid, 16))
 107                         goto out;
 108
 109                 *prev = *index;
 110                 *index = be32_to_cpu(mgm->next_gid_index) >> 6;
 111         } while (*index);
 112
 113         *index = -1;
 114
 115  out:
 116         mthca_free_mailbox(dev, mailbox);
 117         return err;
 118 }
 119
 120 int mthca_multicast_attach(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
 121 {
 122         struct mthca_dev *dev = to_mdev(ibqp->device);
 123         struct mthca_mailbox *mailbox;
 124         struct mthca_mgm *mgm;
 125         u16 hash;
 126         int index, prev;
 127         int link = 0;
 128         int i;
 129         int err;
 130
 131         mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
 132         if (IS_ERR(mailbox))
 133                 return PTR_ERR(mailbox);
 134         mgm = mailbox->buf;
 135
 136         mutex_lock(&dev->mcg_table.mutex);
 137
 138         err = find_mgm(dev, gid->raw, mailbox, &hash, &prev, &index);
 139         if (err)
 140                 goto out;
 141
 142         if (index != -1) {
 143                 if (!memcmp(mgm->gid, zero_gid, 16))
 144                         memcpy(mgm->gid, gid->raw, 16);
 145         } else {
 146                 link = 1;
 147
 148                 index = mthca_alloc(&dev->mcg_table.alloc);
 149                 if (index == -1) {
 150                         mthca_err(dev, "No AMGM entries left\n");
 151                         err = -ENOMEM;
 152                         goto out;
 153                 }
 154
 155                 err = mthca_READ_MGM(dev, index, mailbox);
 156                 if (err) {
 157                         mthca_err(dev, "READ_MGM failed (%d)\n", err);
 158                         goto out;
 159                 }
 160                 memset(mgm, 0, sizeof *mgm);
 161                 memcpy(mgm->gid, gid->raw, 16);
 162         }
 163
 164         for (i = 0; i < MTHCA_QP_PER_MGM; ++i)
 165                 if (mgm->qp[i] == cpu_to_be32(ibqp->qp_num | (1 << 31))) {
 166                         mthca_dbg(dev, "QP %06x already a member of MGM\n",
 167                                   ibqp->qp_num);
 168                         err = 0;
 169                         goto out;
 170                 } else if (!(mgm->qp[i] & cpu_to_be32(1 << 31))) {
 171                         mgm->qp[i] = cpu_to_be32(ibqp->qp_num | (1 << 31));
 172                         break;
 173                 }
 174
 175         if (i == MTHCA_QP_PER_MGM) {
 176                 mthca_err(dev, "MGM at index %x is full.\n", index);
 177                 err = -ENOMEM;
 178                 goto out;
 179         }
 180
 181         err = mthca_WRITE_MGM(dev, index, mailbox);
 182         if (err) {
 183                 mthca_err(dev, "WRITE_MGM failed %d\n", err);
 184                 err = -EINVAL;
 185                 goto out;
 186         }
 187
 188         if (!link)
 189                 goto out;
 190
 191         err = mthca_READ_MGM(dev, prev, mailbox);
 192         if (err) {
 193                 mthca_err(dev, "READ_MGM failed %d\n", err);
 194                 goto out;
 195         }
 196
 197         mgm->next_gid_index = cpu_to_be32(index << 6);
 198
 199         err = mthca_WRITE_MGM(dev, prev, mailbox);
 200         if (err)
 201                 mthca_err(dev, "WRITE_MGM returned %d\n", err);
 202
 203  out:
 204         if (err && link && index != -1) {
 205                 BUG_ON(index < dev->limits.num_mgms);
 206                 mthca_free(&dev->mcg_table.alloc, index);
 207         }
 208         mutex_unlock(&dev->mcg_table.mutex);
 209
 210         mthca_free_mailbox(dev, mailbox);
 211         return err;
 212 }
 213
 214 int mthca_multicast_detach(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
 215 {
 216         struct mthca_dev *dev = to_mdev(ibqp->device);
 217         struct mthca_mailbox *mailbox;
 218         struct mthca_mgm *mgm;
 219         u16 hash;
 220         int prev, index;
 221         int i, loc;
 222         int err;
 223
 224         mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
 225         if (IS_ERR(mailbox))
 226                 return PTR_ERR(mailbox);
 227         mgm = mailbox->buf;
 228
 229         mutex_lock(&dev->mcg_table.mutex);
 230
 231         err = find_mgm(dev, gid->raw, mailbox, &hash, &prev, &index);
 232         if (err)
 233                 goto out;
 234
 235         if (index == -1) {
 236                 mthca_err(dev, "MGID %pI6 not found\n", gid->raw);
 237                 err = -EINVAL;
 238                 goto out;
 239         }
 240
 241         for (loc = -1, i = 0; i < MTHCA_QP_PER_MGM; ++i) {
 242                 if (mgm->qp[i] == cpu_to_be32(ibqp->qp_num | (1 << 31)))
 243                         loc = i;
 244                 if (!(mgm->qp[i] & cpu_to_be32(1 << 31)))
 245                         break;
 246         }
 247
 248         if (loc == -1) {
 249                 mthca_err(dev, "QP %06x not found in MGM\n", ibqp->qp_num);
 250                 err = -EINVAL;
 251                 goto out;
 252         }
 253
 254         mgm->qp[loc]   = mgm->qp[i - 1];
 255         mgm->qp[i - 1] = 0;
 256
 257         err = mthca_WRITE_MGM(dev, index, mailbox);
 258         if (err) {
 259                 mthca_err(dev, "WRITE_MGM returned %d\n", err);
 260                 goto out;
 261         }
 262
 263         if (i != 1)
 264                 goto out;
 265
 266         if (prev == -1) {
 267                 /* Remove entry from MGM */
 268                 int amgm_index_to_free = be32_to_cpu(mgm->next_gid_index) >> 6;
 269                 if (amgm_index_to_free) {
 270                         err = mthca_READ_MGM(dev, amgm_index_to_free,
 271                                              mailbox);
 272                         if (err) {
 273                                 mthca_err(dev, "READ_MGM returned %d\n", err);
 274                                 goto out;
 275                         }
 276                 } else
 277                         memset(mgm->gid, 0, 16);
 278
 279                 err = mthca_WRITE_MGM(dev, index, mailbox);
 280                 if (err) {
 281                         mthca_err(dev, "WRITE_MGM returned %d\n", err);
 282                         goto out;
 283                 }
 284                 if (amgm_index_to_free) {
 285                         BUG_ON(amgm_index_to_free < dev->limits.num_mgms);
 286                         mthca_free(&dev->mcg_table.alloc, amgm_index_to_free);
 287                 }
 288         } else {
 289                 /* Remove entry from AMGM */
 290                 int curr_next_index = be32_to_cpu(mgm->next_gid_index) >> 6;
 291                 err = mthca_READ_MGM(dev, prev, mailbox);
 292                 if (err) {
 293                         mthca_err(dev, "READ_MGM returned %d\n", err);
 294                         goto out;
 295                 }
 296
 297                 mgm->next_gid_index = cpu_to_be32(curr_next_index << 6);
 298
 299                 err = mthca_WRITE_MGM(dev, prev, mailbox);
 300                 if (err) {
 301                         mthca_err(dev, "WRITE_MGM returned %d\n", err);
 302                         goto out;
 303                 }
 304                 BUG_ON(index < dev->limits.num_mgms);
 305                 mthca_free(&dev->mcg_table.alloc, index);
 306         }
 307
 308  out:
 309         mutex_unlock(&dev->mcg_table.mutex);
 310
 311         mthca_free_mailbox(dev, mailbox);
 312         return err;
 313 }
 314
 315 int mthca_init_mcg_table(struct mthca_dev *dev)
 316 {
 317         int err;
 318         int table_size = dev->limits.num_mgms + dev->limits.num_amgms;
 319
 320         err = mthca_alloc_init(&dev->mcg_table.alloc,
 321                                table_size,
 322                                table_size - 1,
 323                                dev->limits.num_mgms);
 324         if (err)
 325                 return err;
 326
 327         mutex_init(&dev->mcg_table.mutex);
 328
 329         return 0;
 330 }
 331
 332 void mthca_cleanup_mcg_table(struct mthca_dev *dev)
 333 {
 334         mthca_alloc_cleanup(&dev->mcg_table.alloc);
 335 }