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/init.h>
  35 #include <linux/string.h>
  36 #include <linux/slab.h>
  37
  38 #include <linux/mlx4/cmd.h>
  39
  40 #include "mlx4.h"
  41
  42 #define MGM_QPN_MASK       0x00FFFFFF
  43 #define MGM_BLCK_LB_BIT    30
  44
  45 struct mlx4_mgm {
  46         __be32                  next_gid_index;
  47         __be32                  members_count;
  48         u32                     reserved[2];
  49         u8                      gid[16];
  50         __be32                  qp[MLX4_QP_PER_MGM];
  51 };
  52
  53 static const u8 zero_gid[16];   /* automatically initialized to 0 */
  54
  55 static int mlx4_READ_MCG(struct mlx4_dev *dev, int index,
  56                          struct mlx4_cmd_mailbox *mailbox)
  57 {
  58         return mlx4_cmd_box(dev, 0, mailbox->dma, index, 0, MLX4_CMD_READ_MCG,
  59                             MLX4_CMD_TIME_CLASS_A);
  60 }
  61
  62 static int mlx4_WRITE_MCG(struct mlx4_dev *dev, int index,
  63                           struct mlx4_cmd_mailbox *mailbox)
  64 {
  65         return mlx4_cmd(dev, mailbox->dma, index, 0, MLX4_CMD_WRITE_MCG,
  66                         MLX4_CMD_TIME_CLASS_A);
  67 }
  68
  69 static int mlx4_MGID_HASH(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
  70                           u16 *hash)
  71 {
  72         u64 imm;
  73         int err;
  74
  75         err = mlx4_cmd_imm(dev, mailbox->dma, &imm, 0, 0, MLX4_CMD_MGID_HASH,
  76                            MLX4_CMD_TIME_CLASS_A);
  77
  78         if (!err)
  79                 *hash = imm;
  80
  81         return err;
  82 }
  83
  84 /*
  85  * Caller must hold MCG table semaphore.  gid and mgm parameters must
  86  * be properly aligned for command interface.
  87  *
  88  *  Returns 0 unless a firmware command error occurs.
  89  *
  90  * If GID is found in MGM or MGM is empty, *index = *hash, *prev = -1
  91  * and *mgm holds MGM entry.
  92  *
  93  * if GID is found in AMGM, *index = index in AMGM, *prev = index of
  94  * previous entry in hash chain and *mgm holds AMGM entry.
  95  *
  96  * If no AMGM exists for given gid, *index = -1, *prev = index of last
  97  * entry in hash chain and *mgm holds end of hash chain.
  98  */
  99 static int find_mgm(struct mlx4_dev *dev,
 100                     u8 *gid, struct mlx4_cmd_mailbox *mgm_mailbox,
 101                     u16 *hash, int *prev, int *index)
 102 {
 103         struct mlx4_cmd_mailbox *mailbox;
 104         struct mlx4_mgm *mgm = mgm_mailbox->buf;
 105         u8 *mgid;
 106         int err;
 107
 108         mailbox = mlx4_alloc_cmd_mailbox(dev);
 109         if (IS_ERR(mailbox))
 110                 return -ENOMEM;
 111         mgid = mailbox->buf;
 112
 113         memcpy(mgid, gid, 16);
 114
 115         err = mlx4_MGID_HASH(dev, mailbox, hash);
 116         mlx4_free_cmd_mailbox(dev, mailbox);
 117         if (err)
 118                 return err;
 119
 120         if (0)
 121                 mlx4_dbg(dev, "Hash for %04x:%04x:%04x:%04x:"
 122                           "%04x:%04x:%04x:%04x is %04x\n",
 123                           be16_to_cpu(((__be16 *) gid)[0]),
 124                           be16_to_cpu(((__be16 *) gid)[1]),
 125                           be16_to_cpu(((__be16 *) gid)[2]),
 126                           be16_to_cpu(((__be16 *) gid)[3]),
 127                           be16_to_cpu(((__be16 *) gid)[4]),
 128                           be16_to_cpu(((__be16 *) gid)[5]),
 129                           be16_to_cpu(((__be16 *) gid)[6]),
 130                           be16_to_cpu(((__be16 *) gid)[7]),
 131                           *hash);
 132
 133         *index = *hash;
 134         *prev  = -1;
 135
 136         do {
 137                 err = mlx4_READ_MCG(dev, *index, mgm_mailbox);
 138                 if (err)
 139                         return err;
 140
 141                 if (!memcmp(mgm->gid, zero_gid, 16)) {
 142                         if (*index != *hash) {
 143                                 mlx4_err(dev, "Found zero MGID in AMGM.\n");
 144                                 err = -EINVAL;
 145                         }
 146                         return err;
 147                 }
 148
 149                 if (!memcmp(mgm->gid, gid, 16))
 150                         return err;
 151
 152                 *prev = *index;
 153                 *index = be32_to_cpu(mgm->next_gid_index) >> 6;
 154         } while (*index);
 155
 156         *index = -1;
 157         return err;
 158 }
 159
 160 int mlx4_multicast_attach(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16],
 161                           int block_mcast_loopback)
 162 {
 163         struct mlx4_priv *priv = mlx4_priv(dev);
 164         struct mlx4_cmd_mailbox *mailbox;
 165         struct mlx4_mgm *mgm;
 166         u32 members_count;
 167         u16 hash;
 168         int index, prev;
 169         int link = 0;
 170         int i;
 171         int err;
 172
 173         mailbox = mlx4_alloc_cmd_mailbox(dev);
 174         if (IS_ERR(mailbox))
 175                 return PTR_ERR(mailbox);
 176         mgm = mailbox->buf;
 177
 178         mutex_lock(&priv->mcg_table.mutex);
 179
 180         err = find_mgm(dev, gid, mailbox, &hash, &prev, &index);
 181         if (err)
 182                 goto out;
 183
 184         if (index != -1) {
 185                 if (!memcmp(mgm->gid, zero_gid, 16))
 186                         memcpy(mgm->gid, gid, 16);
 187         } else {
 188                 link = 1;
 189
 190                 index = mlx4_bitmap_alloc(&priv->mcg_table.bitmap);
 191                 if (index == -1) {
 192                         mlx4_err(dev, "No AMGM entries left\n");
 193                         err = -ENOMEM;
 194                         goto out;
 195                 }
 196                 index += dev->caps.num_mgms;
 197
 198                 memset(mgm, 0, sizeof *mgm);
 199                 memcpy(mgm->gid, gid, 16);
 200         }
 201
 202         members_count = be32_to_cpu(mgm->members_count);
 203         if (members_count == MLX4_QP_PER_MGM) {
 204                 mlx4_err(dev, "MGM at index %x is full.\n", index);
 205                 err = -ENOMEM;
 206                 goto out;
 207         }
 208
 209         for (i = 0; i < members_count; ++i)
 210                 if ((be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK) == qp->qpn) {
 211                         mlx4_dbg(dev, "QP %06x already a member of MGM\n", qp->qpn);
 212                         err = 0;
 213                         goto out;
 214                 }
 215
 216         if (block_mcast_loopback)
 217                 mgm->qp[members_count++] = cpu_to_be32((qp->qpn & MGM_QPN_MASK) |
 218                                                        (1 << MGM_BLCK_LB_BIT));
 219         else
 220                 mgm->qp[members_count++] = cpu_to_be32(qp->qpn & MGM_QPN_MASK);
 221
 222         mgm->members_count       = cpu_to_be32(members_count);
 223
 224         err = mlx4_WRITE_MCG(dev, index, mailbox);
 225         if (err)
 226                 goto out;
 227
 228         if (!link)
 229                 goto out;
 230
 231         err = mlx4_READ_MCG(dev, prev, mailbox);
 232         if (err)
 233                 goto out;
 234
 235         mgm->next_gid_index = cpu_to_be32(index << 6);
 236
 237         err = mlx4_WRITE_MCG(dev, prev, mailbox);
 238         if (err)
 239                 goto out;
 240
 241 out:
 242         if (err && link && index != -1) {
 243                 if (index < dev->caps.num_mgms)
 244                         mlx4_warn(dev, "Got AMGM index %d < %d",
 245                                   index, dev->caps.num_mgms);
 246                 else
 247                         mlx4_bitmap_free(&priv->mcg_table.bitmap,
 248                                          index - dev->caps.num_mgms);
 249         }
 250         mutex_unlock(&priv->mcg_table.mutex);
 251
 252         mlx4_free_cmd_mailbox(dev, mailbox);
 253         return err;
 254 }
 255 EXPORT_SYMBOL_GPL(mlx4_multicast_attach);
 256
 257 int mlx4_multicast_detach(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16])
 258 {
 259         struct mlx4_priv *priv = mlx4_priv(dev);
 260         struct mlx4_cmd_mailbox *mailbox;
 261         struct mlx4_mgm *mgm;
 262         u32 members_count;
 263         u16 hash;
 264         int prev, index;
 265         int i, loc;
 266         int err;
 267
 268         mailbox = mlx4_alloc_cmd_mailbox(dev);
 269         if (IS_ERR(mailbox))
 270                 return PTR_ERR(mailbox);
 271         mgm = mailbox->buf;
 272
 273         mutex_lock(&priv->mcg_table.mutex);
 274
 275         err = find_mgm(dev, gid, mailbox, &hash, &prev, &index);
 276         if (err)
 277                 goto out;
 278
 279         if (index == -1) {
 280                 mlx4_err(dev, "MGID %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x "
 281                           "not found\n",
 282                           be16_to_cpu(((__be16 *) gid)[0]),
 283                           be16_to_cpu(((__be16 *) gid)[1]),
 284                           be16_to_cpu(((__be16 *) gid)[2]),
 285                           be16_to_cpu(((__be16 *) gid)[3]),
 286                           be16_to_cpu(((__be16 *) gid)[4]),
 287                           be16_to_cpu(((__be16 *) gid)[5]),
 288                           be16_to_cpu(((__be16 *) gid)[6]),
 289                           be16_to_cpu(((__be16 *) gid)[7]));
 290                 err = -EINVAL;
 291                 goto out;
 292         }
 293
 294         members_count = be32_to_cpu(mgm->members_count);
 295         for (loc = -1, i = 0; i < members_count; ++i)
 296                 if ((be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK) == qp->qpn)
 297                         loc = i;
 298
 299         if (loc == -1) {
 300                 mlx4_err(dev, "QP %06x not found in MGM\n", qp->qpn);
 301                 err = -EINVAL;
 302                 goto out;
 303         }
 304
 305
 306         mgm->members_count = cpu_to_be32(--members_count);
 307         mgm->qp[loc]       = mgm->qp[i - 1];
 308         mgm->qp[i - 1]     = 0;
 309
 310         if (i != 1) {
 311                 err = mlx4_WRITE_MCG(dev, index, mailbox);
 312                 goto out;
 313         }
 314
 315         if (prev == -1) {
 316                 /* Remove entry from MGM */
 317                 int amgm_index = be32_to_cpu(mgm->next_gid_index) >> 6;
 318                 if (amgm_index) {
 319                         err = mlx4_READ_MCG(dev, amgm_index, mailbox);
 320                         if (err)
 321                                 goto out;
 322                 } else
 323                         memset(mgm->gid, 0, 16);
 324
 325                 err = mlx4_WRITE_MCG(dev, index, mailbox);
 326                 if (err)
 327                         goto out;
 328
 329                 if (amgm_index) {
 330                         if (amgm_index < dev->caps.num_mgms)
 331                                 mlx4_warn(dev, "MGM entry %d had AMGM index %d < %d",
 332                                           index, amgm_index, dev->caps.num_mgms);
 333                         else
 334                                 mlx4_bitmap_free(&priv->mcg_table.bitmap,
 335                                                  amgm_index - dev->caps.num_mgms);
 336                 }
 337         } else {
 338                 /* Remove entry from AMGM */
 339                 int cur_next_index = be32_to_cpu(mgm->next_gid_index) >> 6;
 340                 err = mlx4_READ_MCG(dev, prev, mailbox);
 341                 if (err)
 342                         goto out;
 343
 344                 mgm->next_gid_index = cpu_to_be32(cur_next_index << 6);
 345
 346                 err = mlx4_WRITE_MCG(dev, prev, mailbox);
 347                 if (err)
 348                         goto out;
 349
 350                 if (index < dev->caps.num_mgms)
 351                         mlx4_warn(dev, "entry %d had next AMGM index %d < %d",
 352                                   prev, index, dev->caps.num_mgms);
 353                 else
 354                         mlx4_bitmap_free(&priv->mcg_table.bitmap,
 355                                          index - dev->caps.num_mgms);
 356         }
 357
 358 out:
 359         mutex_unlock(&priv->mcg_table.mutex);
 360
 361         mlx4_free_cmd_mailbox(dev, mailbox);
 362         return err;
 363 }
 364 EXPORT_SYMBOL_GPL(mlx4_multicast_detach);
 365
 366 int mlx4_init_mcg_table(struct mlx4_dev *dev)
 367 {
 368         struct mlx4_priv *priv = mlx4_priv(dev);
 369         int err;
 370
 371         err = mlx4_bitmap_init(&priv->mcg_table.bitmap,
 372                                dev->caps.num_amgms, dev->caps.num_amgms - 1, 0);
 373         if (err)
 374                 return err;
 375
 376         mutex_init(&priv->mcg_table.mutex);
 377
 378         return 0;
 379 }
 380
 381 void mlx4_cleanup_mcg_table(struct mlx4_dev *dev)
 382 {
 383         mlx4_bitmap_cleanup(&mlx4_priv(dev)->mcg_table.bitmap);
 384 }