drivers/net/mlx4/mcg.c

   1 /*
   2  * Copyright (c) 2006, 2007 Cisco Systems, Inc.  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/init.h>
  34 #include <linux/string.h>
  35 #include <linux/slab.h>
  36
  37 #include <linux/mlx4/cmd.h>
  38
  39 #include "mlx4.h"
  40
  41 struct mlx4_mgm {
  42         __be32                  next_gid_index;
  43         __be32                  members_count;
  44         u32                     reserved[2];
  45         u8                      gid[16];
  46         __be32                  qp[MLX4_QP_PER_MGM];
  47 };
  48
  49 static const u8 zero_gid[16];   /* automatically initialized to 0 */
  50
  51 static int mlx4_READ_MCG(struct mlx4_dev *dev, int index,
  52                          struct mlx4_cmd_mailbox *mailbox)
  53 {
  54         return mlx4_cmd_box(dev, 0, mailbox->dma, index, 0, MLX4_CMD_READ_MCG,
  55                             MLX4_CMD_TIME_CLASS_A);
  56 }
  57
  58 static int mlx4_WRITE_MCG(struct mlx4_dev *dev, int index,
  59                           struct mlx4_cmd_mailbox *mailbox)
  60 {
  61         return mlx4_cmd(dev, mailbox->dma, index, 0, MLX4_CMD_WRITE_MCG,
  62                         MLX4_CMD_TIME_CLASS_A);
  63 }
  64
  65 static int mlx4_MGID_HASH(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
  66                           u16 *hash)
  67 {
  68         u64 imm;
  69         int err;
  70
  71         err = mlx4_cmd_imm(dev, mailbox->dma, &imm, 0, 0, MLX4_CMD_MGID_HASH,
  72                            MLX4_CMD_TIME_CLASS_A);
  73
  74         if (!err)
  75                 *hash = imm;
  76
  77         return err;
  78 }
  79
  80 /*
  81  * Caller must hold MCG table semaphore.  gid and mgm parameters must
  82  * be properly aligned for command interface.
  83  *
  84  *  Returns 0 unless a firmware command error occurs.
  85  *
  86  * If GID is found in MGM or MGM is empty, *index = *hash, *prev = -1
  87  * and *mgm holds MGM entry.
  88  *
  89  * if GID is found in AMGM, *index = index in AMGM, *prev = index of
  90  * previous entry in hash chain and *mgm holds AMGM entry.
  91  *
  92  * If no AMGM exists for given gid, *index = -1, *prev = index of last
  93  * entry in hash chain and *mgm holds end of hash chain.
  94  */
  95 static int find_mgm(struct mlx4_dev *dev,
  96                     u8 *gid, struct mlx4_cmd_mailbox *mgm_mailbox,
  97                     u16 *hash, int *prev, int *index)
  98 {
  99         struct mlx4_cmd_mailbox *mailbox;
 100         struct mlx4_mgm *mgm = mgm_mailbox->buf;
 101         u8 *mgid;
 102         int err;
 103
 104         mailbox = mlx4_alloc_cmd_mailbox(dev);
 105         if (IS_ERR(mailbox))
 106                 return -ENOMEM;
 107         mgid = mailbox->buf;
 108
 109         memcpy(mgid, gid, 16);
 110
 111         err = mlx4_MGID_HASH(dev, mailbox, hash);
 112         mlx4_free_cmd_mailbox(dev, mailbox);
 113         if (err)
 114                 return err;
 115
 116         if (0)
 117                 mlx4_dbg(dev, "Hash for %04x:%04x:%04x:%04x:"
 118                           "%04x:%04x:%04x:%04x is %04x\n",
 119                           be16_to_cpu(((__be16 *) gid)[0]),
 120                           be16_to_cpu(((__be16 *) gid)[1]),
 121                           be16_to_cpu(((__be16 *) gid)[2]),
 122                           be16_to_cpu(((__be16 *) gid)[3]),
 123                           be16_to_cpu(((__be16 *) gid)[4]),
 124                           be16_to_cpu(((__be16 *) gid)[5]),
 125                           be16_to_cpu(((__be16 *) gid)[6]),
 126                           be16_to_cpu(((__be16 *) gid)[7]),
 127                           *hash);
 128
 129         *index = *hash;
 130         *prev  = -1;
 131
 132         do {
 133                 err = mlx4_READ_MCG(dev, *index, mgm_mailbox);
 134                 if (err)
 135                         return err;
 136
 137                 if (!memcmp(mgm->gid, zero_gid, 16)) {
 138                         if (*index != *hash) {
 139                                 mlx4_err(dev, "Found zero MGID in AMGM.\n");
 140                                 err = -EINVAL;
 141                         }
 142                         return err;
 143                 }
 144
 145                 if (!memcmp(mgm->gid, gid, 16))
 146                         return err;
 147
 148                 *prev = *index;
 149                 *index = be32_to_cpu(mgm->next_gid_index) >> 6;
 150         } while (*index);
 151
 152         *index = -1;
 153         return err;
 154 }
 155
 156 int mlx4_multicast_attach(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16])
 157 {
 158         struct mlx4_priv *priv = mlx4_priv(dev);
 159         struct mlx4_cmd_mailbox *mailbox;
 160         struct mlx4_mgm *mgm;
 161         u32 members_count;
 162         u16 hash;
 163         int index, prev;
 164         int link = 0;
 165         int i;
 166         int err;
 167
 168         mailbox = mlx4_alloc_cmd_mailbox(dev);
 169         if (IS_ERR(mailbox))
 170                 return PTR_ERR(mailbox);
 171         mgm = mailbox->buf;
 172
 173         mutex_lock(&priv->mcg_table.mutex);
 174
 175         err = find_mgm(dev, gid, mailbox, &hash, &prev, &index);
 176         if (err)
 177                 goto out;
 178
 179         if (index != -1) {
 180                 if (!memcmp(mgm->gid, zero_gid, 16))
 181                         memcpy(mgm->gid, gid, 16);
 182         } else {
 183                 link = 1;
 184
 185                 index = mlx4_bitmap_alloc(&priv->mcg_table.bitmap);
 186                 if (index == -1) {
 187                         mlx4_err(dev, "No AMGM entries left\n");
 188                         err = -ENOMEM;
 189                         goto out;
 190                 }
 191                 index += dev->caps.num_mgms;
 192
 193                 memset(mgm, 0, sizeof *mgm);
 194                 memcpy(mgm->gid, gid, 16);
 195         }
 196
 197         members_count = be32_to_cpu(mgm->members_count);
 198         if (members_count == MLX4_QP_PER_MGM) {
 199                 mlx4_err(dev, "MGM at index %x is full.\n", index);
 200                 err = -ENOMEM;
 201                 goto out;
 202         }
 203
 204         for (i = 0; i < members_count; ++i)
 205                 if (mgm->qp[i] == cpu_to_be32(qp->qpn)) {
 206                         mlx4_dbg(dev, "QP %06x already a member of MGM\n", qp->qpn);
 207                         err = 0;
 208                         goto out;
 209                 }
 210
 211         mgm->qp[members_count++] = cpu_to_be32(qp->qpn);
 212         mgm->members_count       = cpu_to_be32(members_count);
 213
 214         err = mlx4_WRITE_MCG(dev, index, mailbox);
 215         if (err)
 216                 goto out;
 217
 218         if (!link)
 219                 goto out;
 220
 221         err = mlx4_READ_MCG(dev, prev, mailbox);
 222         if (err)
 223                 goto out;
 224
 225         mgm->next_gid_index = cpu_to_be32(index << 6);
 226
 227         err = mlx4_WRITE_MCG(dev, prev, mailbox);
 228         if (err)
 229                 goto out;
 230
 231 out:
 232         if (err && link && index != -1) {
 233                 if (index < dev->caps.num_mgms)
 234                         mlx4_warn(dev, "Got AMGM index %d < %d",
 235                                   index, dev->caps.num_mgms);
 236                 else
 237                         mlx4_bitmap_free(&priv->mcg_table.bitmap,
 238                                          index - dev->caps.num_mgms);
 239         }
 240         mutex_unlock(&priv->mcg_table.mutex);
 241
 242         mlx4_free_cmd_mailbox(dev, mailbox);
 243         return err;
 244 }
 245 EXPORT_SYMBOL_GPL(mlx4_multicast_attach);
 246
 247 int mlx4_multicast_detach(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16])
 248 {
 249         struct mlx4_priv *priv = mlx4_priv(dev);
 250         struct mlx4_cmd_mailbox *mailbox;
 251         struct mlx4_mgm *mgm;
 252         u32 members_count;
 253         u16 hash;
 254         int prev, index;
 255         int i, loc;
 256         int err;
 257
 258         mailbox = mlx4_alloc_cmd_mailbox(dev);
 259         if (IS_ERR(mailbox))
 260                 return PTR_ERR(mailbox);
 261         mgm = mailbox->buf;
 262
 263         mutex_lock(&priv->mcg_table.mutex);
 264
 265         err = find_mgm(dev, gid, mailbox, &hash, &prev, &index);
 266         if (err)
 267                 goto out;
 268
 269         if (index == -1) {
 270                 mlx4_err(dev, "MGID %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x "
 271                           "not found\n",
 272                           be16_to_cpu(((__be16 *) gid)[0]),
 273                           be16_to_cpu(((__be16 *) gid)[1]),
 274                           be16_to_cpu(((__be16 *) gid)[2]),
 275                           be16_to_cpu(((__be16 *) gid)[3]),
 276                           be16_to_cpu(((__be16 *) gid)[4]),
 277                           be16_to_cpu(((__be16 *) gid)[5]),
 278                           be16_to_cpu(((__be16 *) gid)[6]),
 279                           be16_to_cpu(((__be16 *) gid)[7]));
 280                 err = -EINVAL;
 281                 goto out;
 282         }
 283
 284         members_count = be32_to_cpu(mgm->members_count);
 285         for (loc = -1, i = 0; i < members_count; ++i)
 286                 if (mgm->qp[i] == cpu_to_be32(qp->qpn))
 287                         loc = i;
 288
 289         if (loc == -1) {
 290                 mlx4_err(dev, "QP %06x not found in MGM\n", qp->qpn);
 291                 err = -EINVAL;
 292                 goto out;
 293         }
 294
 295
 296         mgm->members_count = cpu_to_be32(--members_count);
 297         mgm->qp[loc]       = mgm->qp[i - 1];
 298         mgm->qp[i - 1]     = 0;
 299
 300         if (i != 1) {
 301                 err = mlx4_WRITE_MCG(dev, index, mailbox);
 302                 goto out;
 303         }
 304
 305         if (prev == -1) {
 306                 /* Remove entry from MGM */
 307                 int amgm_index = be32_to_cpu(mgm->next_gid_index) >> 6;
 308                 if (amgm_index) {
 309                         err = mlx4_READ_MCG(dev, amgm_index, mailbox);
 310                         if (err)
 311                                 goto out;
 312                 } else
 313                         memset(mgm->gid, 0, 16);
 314
 315                 err = mlx4_WRITE_MCG(dev, index, mailbox);
 316                 if (err)
 317                         goto out;
 318
 319                 if (amgm_index) {
 320                         if (amgm_index < dev->caps.num_mgms)
 321                                 mlx4_warn(dev, "MGM entry %d had AMGM index %d < %d",
 322                                           index, amgm_index, dev->caps.num_mgms);
 323                         else
 324                                 mlx4_bitmap_free(&priv->mcg_table.bitmap,
 325                                                  amgm_index - dev->caps.num_mgms);
 326                 }
 327         } else {
 328                 /* Remove entry from AMGM */
 329                 int cur_next_index = be32_to_cpu(mgm->next_gid_index) >> 6;
 330                 err = mlx4_READ_MCG(dev, prev, mailbox);
 331                 if (err)
 332                         goto out;
 333
 334                 mgm->next_gid_index = cpu_to_be32(cur_next_index << 6);
 335
 336                 err = mlx4_WRITE_MCG(dev, prev, mailbox);
 337                 if (err)
 338                         goto out;
 339
 340                 if (index < dev->caps.num_mgms)
 341                         mlx4_warn(dev, "entry %d had next AMGM index %d < %d",
 342                                   prev, index, dev->caps.num_mgms);
 343                 else
 344                         mlx4_bitmap_free(&priv->mcg_table.bitmap,
 345                                          index - dev->caps.num_mgms);
 346         }
 347
 348 out:
 349         mutex_unlock(&priv->mcg_table.mutex);
 350
 351         mlx4_free_cmd_mailbox(dev, mailbox);
 352         return err;
 353 }
 354 EXPORT_SYMBOL_GPL(mlx4_multicast_detach);
 355
 356 int mlx4_init_mcg_table(struct mlx4_dev *dev)
 357 {
 358         struct mlx4_priv *priv = mlx4_priv(dev);
 359         int err;
 360
 361         err = mlx4_bitmap_init(&priv->mcg_table.bitmap,
 362                                dev->caps.num_amgms, dev->caps.num_amgms - 1, 0);
 363         if (err)
 364                 return err;
 365
 366         mutex_init(&priv->mcg_table.mutex);
 367
 368         return 0;
 369 }
 370
 371 void mlx4_cleanup_mcg_table(struct mlx4_dev *dev)
 372 {
 373         mlx4_bitmap_cleanup(&mlx4_priv(dev)->mcg_table.bitmap);
 374 }