release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/net/mlx4/mcg.c

   1 /*
   2  * Copyright (c) 2006, 2007 Cisco Systems, Inc.  All rights reserved.
   3  * Copyright (c) 2007, 2008 Mellanox Technologies. All rights reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the
   9  * OpenIB.org BSD license below:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      - Redistributions of source code must retain the above
  16  *        copyright notice, this list of conditions and the following
  17  *        disclaimer.
  18  *
  19  *      - Redistributions in binary form must reproduce the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer in the documentation and/or other materials
  22  *        provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  */
  33
  34 #include <linux/string.h>
  35
  36 #include <linux/mlx4/cmd.h>
  37
  38 #include "mlx4.h"
  39
  40 #define MGM_QPN_MASK       0x00FFFFFF
  41 #define MGM_BLCK_LB_BIT    30
  42
  43 struct mlx4_mgm {
  44         __be32                  next_gid_index;
  45         __be32                  members_count;
  46         u32                     reserved[2];
  47         u8                      gid[16];
  48         __be32                  qp[MLX4_QP_PER_MGM];
  49 };
  50
  51 static const u8 zero_gid[16];   /* automatically initialized to 0 */
  52
  53 static int mlx4_READ_MCG(struct mlx4_dev *dev, int index,
  54                          struct mlx4_cmd_mailbox *mailbox)
  55 {
  56         return mlx4_cmd_box(dev, 0, mailbox->dma, index, 0, MLX4_CMD_READ_MCG,
  57                             MLX4_CMD_TIME_CLASS_A);
  58 }
  59
  60 static int mlx4_WRITE_MCG(struct mlx4_dev *dev, int index,
  61                           struct mlx4_cmd_mailbox *mailbox)
  62 {
  63         return mlx4_cmd(dev, mailbox->dma, index, 0, MLX4_CMD_WRITE_MCG,
  64                         MLX4_CMD_TIME_CLASS_A);
  65 }
  66
  67 static int mlx4_MGID_HASH(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
  68                           u16 *hash)
  69 {
  70         u64 imm;
  71         int err;
  72
  73         err = mlx4_cmd_imm(dev, mailbox->dma, &imm, 0, 0, MLX4_CMD_MGID_HASH,
  74                            MLX4_CMD_TIME_CLASS_A);
  75
  76         if (!err)
  77                 *hash = imm;
  78
  79         return err;
  80 }
  81
  82 /*
  83  * Caller must hold MCG table semaphore.  gid and mgm parameters must
  84  * be properly aligned for command interface.
  85  *
  86  *  Returns 0 unless a firmware command error occurs.
  87  *
  88  * If GID is found in MGM or MGM is empty, *index = *hash, *prev = -1
  89  * and *mgm holds MGM entry.
  90  *
  91  * if GID is found in AMGM, *index = index in AMGM, *prev = index of
  92  * previous entry in hash chain and *mgm holds AMGM entry.
  93  *
  94  * If no AMGM exists for given gid, *index = -1, *prev = index of last
  95  * entry in hash chain and *mgm holds end of hash chain.
  96  */
  97 static int find_mgm(struct mlx4_dev *dev,
  98                     u8 *gid, struct mlx4_cmd_mailbox *mgm_mailbox,
  99                     u16 *hash, int *prev, int *index)
 100 {
 101         struct mlx4_cmd_mailbox *mailbox;
 102         struct mlx4_mgm *mgm = mgm_mailbox->buf;
 103         u8 *mgid;
 104         int err;
 105
 106         mailbox = mlx4_alloc_cmd_mailbox(dev);
 107         if (IS_ERR(mailbox))
 108                 return -ENOMEM;
 109         mgid = mailbox->buf;
 110
 111         memcpy(mgid, gid, 16);
 112
 113         err = mlx4_MGID_HASH(dev, mailbox, hash);
 114         mlx4_free_cmd_mailbox(dev, mailbox);
 115         if (err)
 116                 return err;
 117
 118         if (0)
 119                 mlx4_dbg(dev, "Hash for %pI6 is %04x\n", gid, *hash);
 120
 121         *index = *hash;
 122         *prev  = -1;
 123
 124         do {
 125                 err = mlx4_READ_MCG(dev, *index, mgm_mailbox);
 126                 if (err)
 127                         return err;
 128
 129                 if (!memcmp(mgm->gid, zero_gid, 16)) {
 130                         if (*index != *hash) {
 131                                 mlx4_err(dev, "Found zero MGID in AMGM.\n");
 132                                 err = -EINVAL;
 133                         }
 134                         return err;
 135                 }
 136
 137                 if (!memcmp(mgm->gid, gid, 16))
 138                         return err;
 139
 140                 *prev = *index;
 141                 *index = be32_to_cpu(mgm->next_gid_index) >> 6;
 142         } while (*index);
 143
 144         *index = -1;
 145         return err;
 146 }
 147
 148 int mlx4_multicast_attach(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16],
 149                           int block_mcast_loopback)
 150 {
 151         struct mlx4_priv *priv = mlx4_priv(dev);
 152         struct mlx4_cmd_mailbox *mailbox;
 153         struct mlx4_mgm *mgm;
 154         u32 members_count;
 155         u16 hash;
 156         int index, prev;
 157         int link = 0;
 158         int i;
 159         int err;
 160
 161         mailbox = mlx4_alloc_cmd_mailbox(dev);
 162         if (IS_ERR(mailbox))
 163                 return PTR_ERR(mailbox);
 164         mgm = mailbox->buf;
 165
 166         mutex_lock(&priv->mcg_table.mutex);
 167
 168         err = find_mgm(dev, gid, mailbox, &hash, &prev, &index);
 169         if (err)
 170                 goto out;
 171
 172         if (index != -1) {
 173                 if (!memcmp(mgm->gid, zero_gid, 16))
 174                         memcpy(mgm->gid, gid, 16);
 175         } else {
 176                 link = 1;
 177
 178                 index = mlx4_bitmap_alloc(&priv->mcg_table.bitmap);
 179                 if (index == -1) {
 180                         mlx4_err(dev, "No AMGM entries left\n");
 181                         err = -ENOMEM;
 182                         goto out;
 183                 }
 184                 index += dev->caps.num_mgms;
 185
 186                 memset(mgm, 0, sizeof *mgm);
 187                 memcpy(mgm->gid, gid, 16);
 188         }
 189
 190         members_count = be32_to_cpu(mgm->members_count);
 191         if (members_count == MLX4_QP_PER_MGM) {
 192                 mlx4_err(dev, "MGM at index %x is full.\n", index);
 193                 err = -ENOMEM;
 194                 goto out;
 195         }
 196
 197         for (i = 0; i < members_count; ++i)
 198                 if ((be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK) == qp->qpn) {
 199                         mlx4_dbg(dev, "QP %06x already a member of MGM\n", qp->qpn);
 200                         err = 0;
 201                         goto out;
 202                 }
 203
 204         if (block_mcast_loopback)
 205                 mgm->qp[members_count++] = cpu_to_be32((qp->qpn & MGM_QPN_MASK) |
 206                                                        (1U << MGM_BLCK_LB_BIT));
 207         else
 208                 mgm->qp[members_count++] = cpu_to_be32(qp->qpn & MGM_QPN_MASK);
 209
 210         mgm->members_count       = cpu_to_be32(members_count);
 211
 212         err = mlx4_WRITE_MCG(dev, index, mailbox);
 213         if (err)
 214                 goto out;
 215
 216         if (!link)
 217                 goto out;
 218
 219         err = mlx4_READ_MCG(dev, prev, mailbox);
 220         if (err)
 221                 goto out;
 222
 223         mgm->next_gid_index = cpu_to_be32(index << 6);
 224
 225         err = mlx4_WRITE_MCG(dev, prev, mailbox);
 226         if (err)
 227                 goto out;
 228
 229 out:
 230         if (err && link && index != -1) {
 231                 if (index < dev->caps.num_mgms)
 232                         mlx4_warn(dev, "Got AMGM index %d < %d",
 233                                   index, dev->caps.num_mgms);
 234                 else
 235                         mlx4_bitmap_free(&priv->mcg_table.bitmap,
 236                                          index - dev->caps.num_mgms);
 237         }
 238         mutex_unlock(&priv->mcg_table.mutex);
 239
 240         mlx4_free_cmd_mailbox(dev, mailbox);
 241         return err;
 242 }
 243 EXPORT_SYMBOL_GPL(mlx4_multicast_attach);
 244
 245 int mlx4_multicast_detach(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16])
 246 {
 247         struct mlx4_priv *priv = mlx4_priv(dev);
 248         struct mlx4_cmd_mailbox *mailbox;
 249         struct mlx4_mgm *mgm;
 250         u32 members_count;
 251         u16 hash;
 252         int prev, index;
 253         int i, loc;
 254         int err;
 255
 256         mailbox = mlx4_alloc_cmd_mailbox(dev);
 257         if (IS_ERR(mailbox))
 258                 return PTR_ERR(mailbox);
 259         mgm = mailbox->buf;
 260
 261         mutex_lock(&priv->mcg_table.mutex);
 262
 263         err = find_mgm(dev, gid, mailbox, &hash, &prev, &index);
 264         if (err)
 265                 goto out;
 266
 267         if (index == -1) {
 268                 mlx4_err(dev, "MGID %pI6 not found\n", gid);
 269                 err = -EINVAL;
 270                 goto out;
 271         }
 272
 273         members_count = be32_to_cpu(mgm->members_count);
 274         for (loc = -1, i = 0; i < members_count; ++i)
 275                 if ((be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK) == qp->qpn)
 276                         loc = i;
 277
 278         if (loc == -1) {
 279                 mlx4_err(dev, "QP %06x not found in MGM\n", qp->qpn);
 280                 err = -EINVAL;
 281                 goto out;
 282         }
 283
 284
 285         mgm->members_count = cpu_to_be32(--members_count);
 286         mgm->qp[loc]       = mgm->qp[i - 1];
 287         mgm->qp[i - 1]     = 0;
 288
 289         if (i != 1) {
 290                 err = mlx4_WRITE_MCG(dev, index, mailbox);
 291                 goto out;
 292         }
 293
 294         if (prev == -1) {
 295                 /* Remove entry from MGM */
 296                 int amgm_index = be32_to_cpu(mgm->next_gid_index) >> 6;
 297                 if (amgm_index) {
 298                         err = mlx4_READ_MCG(dev, amgm_index, mailbox);
 299                         if (err)
 300                                 goto out;
 301                 } else
 302                         memset(mgm->gid, 0, 16);
 303
 304                 err = mlx4_WRITE_MCG(dev, index, mailbox);
 305                 if (err)
 306                         goto out;
 307
 308                 if (amgm_index) {
 309                         if (amgm_index < dev->caps.num_mgms)
 310                                 mlx4_warn(dev, "MGM entry %d had AMGM index %d < %d",
 311                                           index, amgm_index, dev->caps.num_mgms);
 312                         else
 313                                 mlx4_bitmap_free(&priv->mcg_table.bitmap,
 314                                                  amgm_index - dev->caps.num_mgms);
 315                 }
 316         } else {
 317                 /* Remove entry from AMGM */
 318                 int cur_next_index = be32_to_cpu(mgm->next_gid_index) >> 6;
 319                 err = mlx4_READ_MCG(dev, prev, mailbox);
 320                 if (err)
 321                         goto out;
 322
 323                 mgm->next_gid_index = cpu_to_be32(cur_next_index << 6);
 324
 325                 err = mlx4_WRITE_MCG(dev, prev, mailbox);
 326                 if (err)
 327                         goto out;
 328
 329                 if (index < dev->caps.num_mgms)
 330                         mlx4_warn(dev, "entry %d had next AMGM index %d < %d",
 331                                   prev, index, dev->caps.num_mgms);
 332                 else
 333                         mlx4_bitmap_free(&priv->mcg_table.bitmap,
 334                                          index - dev->caps.num_mgms);
 335         }
 336
 337 out:
 338         mutex_unlock(&priv->mcg_table.mutex);
 339
 340         mlx4_free_cmd_mailbox(dev, mailbox);
 341         return err;
 342 }
 343 EXPORT_SYMBOL_GPL(mlx4_multicast_detach);
 344
 345 int mlx4_init_mcg_table(struct mlx4_dev *dev)
 346 {
 347         struct mlx4_priv *priv = mlx4_priv(dev);
 348         int err;
 349
 350         err = mlx4_bitmap_init(&priv->mcg_table.bitmap, dev->caps.num_amgms,
 351                                dev->caps.num_amgms - 1, 0, 0);
 352         if (err)
 353                 return err;
 354
 355         mutex_init(&priv->mcg_table.mutex);
 356
 357         return 0;
 358 }
 359
 360 void mlx4_cleanup_mcg_table(struct mlx4_dev *dev)
 361 {
 362         mlx4_bitmap_cleanup(&mlx4_priv(dev)->mcg_table.bitmap);
 363 }