drivers/net/ethernet/mellanox/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 #include <linux/etherdevice.h>
  36
  37 #include <linux/mlx4/cmd.h>
  38 #include <linux/export.h>
  39
  40 #include "mlx4.h"
  41
  42 #define MGM_QPN_MASK       0x00FFFFFF
  43 #define MGM_BLCK_LB_BIT    30
  44
  45 static const u8 zero_gid[16];   /* automatically initialized to 0 */
  46
  47 struct mlx4_mgm {
  48         __be32                  next_gid_index;
  49         __be32                  members_count;
  50         u32                     reserved[2];
  51         u8                      gid[16];
  52         __be32                  qp[MLX4_MAX_QP_PER_MGM];
  53 };
  54
  55 int mlx4_get_mgm_entry_size(struct mlx4_dev *dev)
  56 {
  57         return min((1 << mlx4_log_num_mgm_entry_size), MLX4_MAX_MGM_ENTRY_SIZE);
  58 }
  59
  60 int mlx4_get_qp_per_mgm(struct mlx4_dev *dev)
  61 {
  62         return 4 * (mlx4_get_mgm_entry_size(dev) / 16 - 2);
  63 }
  64
  65 static int mlx4_READ_ENTRY(struct mlx4_dev *dev, int index,
  66                            struct mlx4_cmd_mailbox *mailbox)
  67 {
  68         return mlx4_cmd_box(dev, 0, mailbox->dma, index, 0, MLX4_CMD_READ_MCG,
  69                             MLX4_CMD_TIME_CLASS_A, MLX4_CMD_NATIVE);
  70 }
  71
  72 static int mlx4_WRITE_ENTRY(struct mlx4_dev *dev, int index,
  73                             struct mlx4_cmd_mailbox *mailbox)
  74 {
  75         return mlx4_cmd(dev, mailbox->dma, index, 0, MLX4_CMD_WRITE_MCG,
  76                         MLX4_CMD_TIME_CLASS_A, MLX4_CMD_NATIVE);
  77 }
  78
  79 static int mlx4_WRITE_PROMISC(struct mlx4_dev *dev, u8 port, u8 steer,
  80                               struct mlx4_cmd_mailbox *mailbox)
  81 {
  82         u32 in_mod;
  83
  84         in_mod = (u32) port << 16 | steer << 1;
  85         return mlx4_cmd(dev, mailbox->dma, in_mod, 0x1,
  86                         MLX4_CMD_WRITE_MCG, MLX4_CMD_TIME_CLASS_A,
  87                         MLX4_CMD_NATIVE);
  88 }
  89
  90 static int mlx4_GID_HASH(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
  91                          u16 *hash, u8 op_mod)
  92 {
  93         u64 imm;
  94         int err;
  95
  96         err = mlx4_cmd_imm(dev, mailbox->dma, &imm, 0, op_mod,
  97                            MLX4_CMD_MGID_HASH, MLX4_CMD_TIME_CLASS_A,
  98                            MLX4_CMD_NATIVE);
  99
 100         if (!err)
 101                 *hash = imm;
 102
 103         return err;
 104 }
 105
 106 static struct mlx4_promisc_qp *get_promisc_qp(struct mlx4_dev *dev, u8 pf_num,
 107                                               enum mlx4_steer_type steer,
 108                                               u32 qpn)
 109 {
 110         struct mlx4_steer *s_steer = &mlx4_priv(dev)->steer[pf_num];
 111         struct mlx4_promisc_qp *pqp;
 112
 113         list_for_each_entry(pqp, &s_steer->promisc_qps[steer], list) {
 114                 if (pqp->qpn == qpn)
 115                         return pqp;
 116         }
 117         /* not found */
 118         return NULL;
 119 }
 120
 121 /*
 122  * Add new entry to steering data structure.
 123  * All promisc QPs should be added as well
 124  */
 125 static int new_steering_entry(struct mlx4_dev *dev, u8 port,
 126                               enum mlx4_steer_type steer,
 127                               unsigned int index, u32 qpn)
 128 {
 129         struct mlx4_steer *s_steer;
 130         struct mlx4_cmd_mailbox *mailbox;
 131         struct mlx4_mgm *mgm;
 132         u32 members_count;
 133         struct mlx4_steer_index *new_entry;
 134         struct mlx4_promisc_qp *pqp;
 135         struct mlx4_promisc_qp *dqp = NULL;
 136         u32 prot;
 137         int err;
 138
 139         s_steer = &mlx4_priv(dev)->steer[port - 1];
 140         new_entry = kzalloc(sizeof *new_entry, GFP_KERNEL);
 141         if (!new_entry)
 142                 return -ENOMEM;
 143
 144         INIT_LIST_HEAD(&new_entry->duplicates);
 145         new_entry->index = index;
 146         list_add_tail(&new_entry->list, &s_steer->steer_entries[steer]);
 147
 148         /* If the given qpn is also a promisc qp,
 149          * it should be inserted to duplicates list
 150          */
 151         pqp = get_promisc_qp(dev, 0, steer, qpn);
 152         if (pqp) {
 153                 dqp = kmalloc(sizeof *dqp, GFP_KERNEL);
 154                 if (!dqp) {
 155                         err = -ENOMEM;
 156                         goto out_alloc;
 157                 }
 158                 dqp->qpn = qpn;
 159                 list_add_tail(&dqp->list, &new_entry->duplicates);
 160         }
 161
 162         /* if no promisc qps for this vep, we are done */
 163         if (list_empty(&s_steer->promisc_qps[steer]))
 164                 return 0;
 165
 166         /* now need to add all the promisc qps to the new
 167          * steering entry, as they should also receive the packets
 168          * destined to this address */
 169         mailbox = mlx4_alloc_cmd_mailbox(dev);
 170         if (IS_ERR(mailbox)) {
 171                 err = -ENOMEM;
 172                 goto out_alloc;
 173         }
 174         mgm = mailbox->buf;
 175
 176         err = mlx4_READ_ENTRY(dev, index, mailbox);
 177         if (err)
 178                 goto out_mailbox;
 179
 180         members_count = be32_to_cpu(mgm->members_count) & 0xffffff;
 181         prot = be32_to_cpu(mgm->members_count) >> 30;
 182         list_for_each_entry(pqp, &s_steer->promisc_qps[steer], list) {
 183                 /* don't add already existing qpn */
 184                 if (pqp->qpn == qpn)
 185                         continue;
 186                 if (members_count == dev->caps.num_qp_per_mgm) {
 187                         /* out of space */
 188                         err = -ENOMEM;
 189                         goto out_mailbox;
 190                 }
 191
 192                 /* add the qpn */
 193                 mgm->qp[members_count++] = cpu_to_be32(pqp->qpn & MGM_QPN_MASK);
 194         }
 195         /* update the qps count and update the entry with all the promisc qps*/
 196         mgm->members_count = cpu_to_be32(members_count | (prot << 30));
 197         err = mlx4_WRITE_ENTRY(dev, index, mailbox);
 198
 199 out_mailbox:
 200         mlx4_free_cmd_mailbox(dev, mailbox);
 201         if (!err)
 202                 return 0;
 203 out_alloc:
 204         if (dqp) {
 205                 list_del(&dqp->list);
 206                 kfree(dqp);
 207         }
 208         list_del(&new_entry->list);
 209         kfree(new_entry);
 210         return err;
 211 }
 212
 213 /* update the data structures with existing steering entry */
 214 static int existing_steering_entry(struct mlx4_dev *dev, u8 port,
 215                                    enum mlx4_steer_type steer,
 216                                    unsigned int index, u32 qpn)
 217 {
 218         struct mlx4_steer *s_steer;
 219         struct mlx4_steer_index *tmp_entry, *entry = NULL;
 220         struct mlx4_promisc_qp *pqp;
 221         struct mlx4_promisc_qp *dqp;
 222
 223         s_steer = &mlx4_priv(dev)->steer[port - 1];
 224
 225         pqp = get_promisc_qp(dev, 0, steer, qpn);
 226         if (!pqp)
 227                 return 0; /* nothing to do */
 228
 229         list_for_each_entry(tmp_entry, &s_steer->steer_entries[steer], list) {
 230                 if (tmp_entry->index == index) {
 231                         entry = tmp_entry;
 232                         break;
 233                 }
 234         }
 235         if (unlikely(!entry)) {
 236                 mlx4_warn(dev, "Steering entry at index %x is not registered\n", index);
 237                 return -EINVAL;
 238         }
 239
 240         /* the given qpn is listed as a promisc qpn
 241          * we need to add it as a duplicate to this entry
 242          * for future references */
 243         list_for_each_entry(dqp, &entry->duplicates, list) {
 244                 if (qpn == pqp->qpn)
 245                         return 0; /* qp is already duplicated */
 246         }
 247
 248         /* add the qp as a duplicate on this index */
 249         dqp = kmalloc(sizeof *dqp, GFP_KERNEL);
 250         if (!dqp)
 251                 return -ENOMEM;
 252         dqp->qpn = qpn;
 253         list_add_tail(&dqp->list, &entry->duplicates);
 254
 255         return 0;
 256 }
 257
 258 /* Check whether a qpn is a duplicate on steering entry
 259  * If so, it should not be removed from mgm */
 260 static bool check_duplicate_entry(struct mlx4_dev *dev, u8 port,
 261                                   enum mlx4_steer_type steer,
 262                                   unsigned int index, u32 qpn)
 263 {
 264         struct mlx4_steer *s_steer;
 265         struct mlx4_steer_index *tmp_entry, *entry = NULL;
 266         struct mlx4_promisc_qp *dqp, *tmp_dqp;
 267
 268         s_steer = &mlx4_priv(dev)->steer[port - 1];
 269
 270         /* if qp is not promisc, it cannot be duplicated */
 271         if (!get_promisc_qp(dev, 0, steer, qpn))
 272                 return false;
 273
 274         /* The qp is promisc qp so it is a duplicate on this index
 275          * Find the index entry, and remove the duplicate */
 276         list_for_each_entry(tmp_entry, &s_steer->steer_entries[steer], list) {
 277                 if (tmp_entry->index == index) {
 278                         entry = tmp_entry;
 279                         break;
 280                 }
 281         }
 282         if (unlikely(!entry)) {
 283                 mlx4_warn(dev, "Steering entry for index %x is not registered\n", index);
 284                 return false;
 285         }
 286         list_for_each_entry_safe(dqp, tmp_dqp, &entry->duplicates, list) {
 287                 if (dqp->qpn == qpn) {
 288                         list_del(&dqp->list);
 289                         kfree(dqp);
 290                 }
 291         }
 292         return true;
 293 }
 294
 295 /* I a steering entry contains only promisc QPs, it can be removed. */
 296 static bool can_remove_steering_entry(struct mlx4_dev *dev, u8 port,
 297                                       enum mlx4_steer_type steer,
 298                                       unsigned int index, u32 tqpn)
 299 {
 300         struct mlx4_steer *s_steer;
 301         struct mlx4_cmd_mailbox *mailbox;
 302         struct mlx4_mgm *mgm;
 303         struct mlx4_steer_index *entry = NULL, *tmp_entry;
 304         u32 qpn;
 305         u32 members_count;
 306         bool ret = false;
 307         int i;
 308
 309         s_steer = &mlx4_priv(dev)->steer[port - 1];
 310
 311         mailbox = mlx4_alloc_cmd_mailbox(dev);
 312         if (IS_ERR(mailbox))
 313                 return false;
 314         mgm = mailbox->buf;
 315
 316         if (mlx4_READ_ENTRY(dev, index, mailbox))
 317                 goto out;
 318         members_count = be32_to_cpu(mgm->members_count) & 0xffffff;
 319         for (i = 0;  i < members_count; i++) {
 320                 qpn = be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK;
 321                 if (!get_promisc_qp(dev, 0, steer, qpn) && qpn != tqpn) {
 322                         /* the qp is not promisc, the entry can't be removed */
 323                         goto out;
 324                 }
 325         }
 326          /* All the qps currently registered for this entry are promiscuous,
 327           * Checking for duplicates */
 328         ret = true;
 329         list_for_each_entry_safe(entry, tmp_entry, &s_steer->steer_entries[steer], list) {
 330                 if (entry->index == index) {
 331                         if (list_empty(&entry->duplicates)) {
 332                                 list_del(&entry->list);
 333                                 kfree(entry);
 334                         } else {
 335                                 /* This entry contains duplicates so it shouldn't be removed */
 336                                 ret = false;
 337                                 goto out;
 338                         }
 339                 }
 340         }
 341
 342 out:
 343         mlx4_free_cmd_mailbox(dev, mailbox);
 344         return ret;
 345 }
 346
 347 static int add_promisc_qp(struct mlx4_dev *dev, u8 port,
 348                           enum mlx4_steer_type steer, u32 qpn)
 349 {
 350         struct mlx4_steer *s_steer;
 351         struct mlx4_cmd_mailbox *mailbox;
 352         struct mlx4_mgm *mgm;
 353         struct mlx4_steer_index *entry;
 354         struct mlx4_promisc_qp *pqp;
 355         struct mlx4_promisc_qp *dqp;
 356         u32 members_count;
 357         u32 prot;
 358         int i;
 359         bool found;
 360         int last_index;
 361         int err;
 362         struct mlx4_priv *priv = mlx4_priv(dev);
 363
 364         s_steer = &mlx4_priv(dev)->steer[port - 1];
 365
 366         mutex_lock(&priv->mcg_table.mutex);
 367
 368         if (get_promisc_qp(dev, 0, steer, qpn)) {
 369                 err = 0;  /* Noting to do, already exists */
 370                 goto out_mutex;
 371         }
 372
 373         pqp = kmalloc(sizeof *pqp, GFP_KERNEL);
 374         if (!pqp) {
 375                 err = -ENOMEM;
 376                 goto out_mutex;
 377         }
 378         pqp->qpn = qpn;
 379
 380         mailbox = mlx4_alloc_cmd_mailbox(dev);
 381         if (IS_ERR(mailbox)) {
 382                 err = -ENOMEM;
 383                 goto out_alloc;
 384         }
 385         mgm = mailbox->buf;
 386
 387         /* the promisc qp needs to be added for each one of the steering
 388          * entries, if it already exists, needs to be added as a duplicate
 389          * for this entry */
 390         list_for_each_entry(entry, &s_steer->steer_entries[steer], list) {
 391                 err = mlx4_READ_ENTRY(dev, entry->index, mailbox);
 392                 if (err)
 393                         goto out_mailbox;
 394
 395                 members_count = be32_to_cpu(mgm->members_count) & 0xffffff;
 396                 prot = be32_to_cpu(mgm->members_count) >> 30;
 397                 found = false;
 398                 for (i = 0; i < members_count; i++) {
 399                         if ((be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK) == qpn) {
 400                                 /* Entry already exists, add to duplicates */
 401                                 dqp = kmalloc(sizeof *dqp, GFP_KERNEL);
 402                                 if (!dqp)
 403                                         goto out_mailbox;
 404                                 dqp->qpn = qpn;
 405                                 list_add_tail(&dqp->list, &entry->duplicates);
 406                                 found = true;
 407                         }
 408                 }
 409                 if (!found) {
 410                         /* Need to add the qpn to mgm */
 411                         if (members_count == dev->caps.num_qp_per_mgm) {
 412                                 /* entry is full */
 413                                 err = -ENOMEM;
 414                                 goto out_mailbox;
 415                         }
 416                         mgm->qp[members_count++] = cpu_to_be32(qpn & MGM_QPN_MASK);
 417                         mgm->members_count = cpu_to_be32(members_count | (prot << 30));
 418                         err = mlx4_WRITE_ENTRY(dev, entry->index, mailbox);
 419                         if (err)
 420                                 goto out_mailbox;
 421                 }
 422                 last_index = entry->index;
 423         }
 424
 425         /* add the new qpn to list of promisc qps */
 426         list_add_tail(&pqp->list, &s_steer->promisc_qps[steer]);
 427         /* now need to add all the promisc qps to default entry */
 428         memset(mgm, 0, sizeof *mgm);
 429         members_count = 0;
 430         list_for_each_entry(dqp, &s_steer->promisc_qps[steer], list)
 431                 mgm->qp[members_count++] = cpu_to_be32(dqp->qpn & MGM_QPN_MASK);
 432         mgm->members_count = cpu_to_be32(members_count | MLX4_PROT_ETH << 30);
 433
 434         err = mlx4_WRITE_PROMISC(dev, port, steer, mailbox);
 435         if (err)
 436                 goto out_list;
 437
 438         mlx4_free_cmd_mailbox(dev, mailbox);
 439         mutex_unlock(&priv->mcg_table.mutex);
 440         return 0;
 441
 442 out_list:
 443         list_del(&pqp->list);
 444 out_mailbox:
 445         mlx4_free_cmd_mailbox(dev, mailbox);
 446 out_alloc:
 447         kfree(pqp);
 448 out_mutex:
 449         mutex_unlock(&priv->mcg_table.mutex);
 450         return err;
 451 }
 452
 453 static int remove_promisc_qp(struct mlx4_dev *dev, u8 port,
 454                              enum mlx4_steer_type steer, u32 qpn)
 455 {
 456         struct mlx4_priv *priv = mlx4_priv(dev);
 457         struct mlx4_steer *s_steer;
 458         struct mlx4_cmd_mailbox *mailbox;
 459         struct mlx4_mgm *mgm;
 460         struct mlx4_steer_index *entry;
 461         struct mlx4_promisc_qp *pqp;
 462         struct mlx4_promisc_qp *dqp;
 463         u32 members_count;
 464         bool found;
 465         bool back_to_list = false;
 466         int loc, i;
 467         int err;
 468
 469         s_steer = &mlx4_priv(dev)->steer[port - 1];
 470         mutex_lock(&priv->mcg_table.mutex);
 471
 472         pqp = get_promisc_qp(dev, 0, steer, qpn);
 473         if (unlikely(!pqp)) {
 474                 mlx4_warn(dev, "QP %x is not promiscuous QP\n", qpn);
 475                 /* nothing to do */
 476                 err = 0;
 477                 goto out_mutex;
 478         }
 479
 480         /*remove from list of promisc qps */
 481         list_del(&pqp->list);
 482
 483         /* set the default entry not to include the removed one */
 484         mailbox = mlx4_alloc_cmd_mailbox(dev);
 485         if (IS_ERR(mailbox)) {
 486                 err = -ENOMEM;
 487                 back_to_list = true;
 488                 goto out_list;
 489         }
 490         mgm = mailbox->buf;
 491         memset(mgm, 0, sizeof *mgm);
 492         members_count = 0;
 493         list_for_each_entry(dqp, &s_steer->promisc_qps[steer], list)
 494                 mgm->qp[members_count++] = cpu_to_be32(dqp->qpn & MGM_QPN_MASK);
 495         mgm->members_count = cpu_to_be32(members_count | MLX4_PROT_ETH << 30);
 496
 497         err = mlx4_WRITE_PROMISC(dev, port, steer, mailbox);
 498         if (err)
 499                 goto out_mailbox;
 500
 501         /* remove the qp from all the steering entries*/
 502         list_for_each_entry(entry, &s_steer->steer_entries[steer], list) {
 503                 found = false;
 504                 list_for_each_entry(dqp, &entry->duplicates, list) {
 505                         if (dqp->qpn == qpn) {
 506                                 found = true;
 507                                 break;
 508                         }
 509                 }
 510                 if (found) {
 511                         /* a duplicate, no need to change the mgm,
 512                          * only update the duplicates list */
 513                         list_del(&dqp->list);
 514                         kfree(dqp);
 515                 } else {
 516                         err = mlx4_READ_ENTRY(dev, entry->index, mailbox);
 517                                 if (err)
 518                                         goto out_mailbox;
 519                         members_count = be32_to_cpu(mgm->members_count) & 0xffffff;
 520                         for (loc = -1, i = 0; i < members_count; ++i)
 521                                 if ((be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK) == qpn)
 522                                         loc = i;
 523
 524                         mgm->members_count = cpu_to_be32(--members_count |
 525                                                          (MLX4_PROT_ETH << 30));
 526                         mgm->qp[loc] = mgm->qp[i - 1];
 527                         mgm->qp[i - 1] = 0;
 528
 529                         err = mlx4_WRITE_ENTRY(dev, entry->index, mailbox);
 530                                 if (err)
 531                                         goto out_mailbox;
 532                 }
 533
 534         }
 535
 536 out_mailbox:
 537         mlx4_free_cmd_mailbox(dev, mailbox);
 538 out_list:
 539         if (back_to_list)
 540                 list_add_tail(&pqp->list, &s_steer->promisc_qps[steer]);
 541         else
 542                 kfree(pqp);
 543 out_mutex:
 544         mutex_unlock(&priv->mcg_table.mutex);
 545         return err;
 546 }
 547
 548 /*
 549  * Caller must hold MCG table semaphore.  gid and mgm parameters must
 550  * be properly aligned for command interface.
 551  *
 552  *  Returns 0 unless a firmware command error occurs.
 553  *
 554  * If GID is found in MGM or MGM is empty, *index = *hash, *prev = -1
 555  * and *mgm holds MGM entry.
 556  *
 557  * if GID is found in AMGM, *index = index in AMGM, *prev = index of
 558  * previous entry in hash chain and *mgm holds AMGM entry.
 559  *
 560  * If no AMGM exists for given gid, *index = -1, *prev = index of last
 561  * entry in hash chain and *mgm holds end of hash chain.
 562  */
 563 static int find_entry(struct mlx4_dev *dev, u8 port,
 564                       u8 *gid, enum mlx4_protocol prot,
 565                       enum mlx4_steer_type steer,
 566                       struct mlx4_cmd_mailbox *mgm_mailbox,
 567                       u16 *hash, int *prev, int *index)
 568 {
 569         struct mlx4_cmd_mailbox *mailbox;
 570         struct mlx4_mgm *mgm = mgm_mailbox->buf;
 571         u8 *mgid;
 572         int err;
 573         u8 op_mod = (prot == MLX4_PROT_ETH) ?
 574                 !!(dev->caps.flags & MLX4_DEV_CAP_FLAG_VEP_MC_STEER) : 0;
 575
 576         mailbox = mlx4_alloc_cmd_mailbox(dev);
 577         if (IS_ERR(mailbox))
 578                 return -ENOMEM;
 579         mgid = mailbox->buf;
 580
 581         memcpy(mgid, gid, 16);
 582
 583         err = mlx4_GID_HASH(dev, mailbox, hash, op_mod);
 584         mlx4_free_cmd_mailbox(dev, mailbox);
 585         if (err)
 586                 return err;
 587
 588         if (0)
 589                 mlx4_dbg(dev, "Hash for %pI6 is %04x\n", gid, *hash);
 590
 591         *index = *hash;
 592         *prev  = -1;
 593
 594         do {
 595                 err = mlx4_READ_ENTRY(dev, *index, mgm_mailbox);
 596                 if (err)
 597                         return err;
 598
 599                 if (!(be32_to_cpu(mgm->members_count) & 0xffffff)) {
 600                         if (*index != *hash) {
 601                                 mlx4_err(dev, "Found zero MGID in AMGM.\n");
 602                                 err = -EINVAL;
 603                         }
 604                         return err;
 605                 }
 606
 607                 if (!memcmp(mgm->gid, gid, 16) &&
 608                     be32_to_cpu(mgm->members_count) >> 30 == prot)
 609                         return err;
 610
 611                 *prev = *index;
 612                 *index = be32_to_cpu(mgm->next_gid_index) >> 6;
 613         } while (*index);
 614
 615         *index = -1;
 616         return err;
 617 }
 618
 619 int mlx4_qp_attach_common(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16],
 620                           int block_mcast_loopback, enum mlx4_protocol prot,
 621                           enum mlx4_steer_type steer)
 622 {
 623         struct mlx4_priv *priv = mlx4_priv(dev);
 624         struct mlx4_cmd_mailbox *mailbox;
 625         struct mlx4_mgm *mgm;
 626         u32 members_count;
 627         u16 hash;
 628         int index, prev;
 629         int link = 0;
 630         int i;
 631         int err;
 632         u8 port = gid[5];
 633         u8 new_entry = 0;
 634
 635         mailbox = mlx4_alloc_cmd_mailbox(dev);
 636         if (IS_ERR(mailbox))
 637                 return PTR_ERR(mailbox);
 638         mgm = mailbox->buf;
 639
 640         mutex_lock(&priv->mcg_table.mutex);
 641         err = find_entry(dev, port, gid, prot, steer,
 642                          mailbox, &hash, &prev, &index);
 643         if (err)
 644                 goto out;
 645
 646         if (index != -1) {
 647                 if (!(be32_to_cpu(mgm->members_count) & 0xffffff)) {
 648                         new_entry = 1;
 649                         memcpy(mgm->gid, gid, 16);
 650                 }
 651         } else {
 652                 link = 1;
 653
 654                 index = mlx4_bitmap_alloc(&priv->mcg_table.bitmap);
 655                 if (index == -1) {
 656                         mlx4_err(dev, "No AMGM entries left\n");
 657                         err = -ENOMEM;
 658                         goto out;
 659                 }
 660                 index += dev->caps.num_mgms;
 661
 662                 new_entry = 1;
 663                 memset(mgm, 0, sizeof *mgm);
 664                 memcpy(mgm->gid, gid, 16);
 665         }
 666
 667         members_count = be32_to_cpu(mgm->members_count) & 0xffffff;
 668         if (members_count == dev->caps.num_qp_per_mgm) {
 669                 mlx4_err(dev, "MGM at index %x is full.\n", index);
 670                 err = -ENOMEM;
 671                 goto out;
 672         }
 673
 674         for (i = 0; i < members_count; ++i)
 675                 if ((be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK) == qp->qpn) {
 676                         mlx4_dbg(dev, "QP %06x already a member of MGM\n", qp->qpn);
 677                         err = 0;
 678                         goto out;
 679                 }
 680
 681         if (block_mcast_loopback)
 682                 mgm->qp[members_count++] = cpu_to_be32((qp->qpn & MGM_QPN_MASK) |
 683                                                        (1U << MGM_BLCK_LB_BIT));
 684         else
 685                 mgm->qp[members_count++] = cpu_to_be32(qp->qpn & MGM_QPN_MASK);
 686
 687         mgm->members_count = cpu_to_be32(members_count | (u32) prot << 30);
 688
 689         err = mlx4_WRITE_ENTRY(dev, index, mailbox);
 690         if (err)
 691                 goto out;
 692
 693         if (!link)
 694                 goto out;
 695
 696         err = mlx4_READ_ENTRY(dev, prev, mailbox);
 697         if (err)
 698                 goto out;
 699
 700         mgm->next_gid_index = cpu_to_be32(index << 6);
 701
 702         err = mlx4_WRITE_ENTRY(dev, prev, mailbox);
 703         if (err)
 704                 goto out;
 705
 706 out:
 707         if (prot == MLX4_PROT_ETH) {
 708                 /* manage the steering entry for promisc mode */
 709                 if (new_entry)
 710                         new_steering_entry(dev, port, steer, index, qp->qpn);
 711                 else
 712                         existing_steering_entry(dev, port, steer,
 713                                                 index, qp->qpn);
 714         }
 715         if (err && link && index != -1) {
 716                 if (index < dev->caps.num_mgms)
 717                         mlx4_warn(dev, "Got AMGM index %d < %d",
 718                                   index, dev->caps.num_mgms);
 719                 else
 720                         mlx4_bitmap_free(&priv->mcg_table.bitmap,
 721                                          index - dev->caps.num_mgms);
 722         }
 723         mutex_unlock(&priv->mcg_table.mutex);
 724
 725         mlx4_free_cmd_mailbox(dev, mailbox);
 726         return err;
 727 }
 728
 729 int mlx4_qp_detach_common(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16],
 730                           enum mlx4_protocol prot, enum mlx4_steer_type steer)
 731 {
 732         struct mlx4_priv *priv = mlx4_priv(dev);
 733         struct mlx4_cmd_mailbox *mailbox;
 734         struct mlx4_mgm *mgm;
 735         u32 members_count;
 736         u16 hash;
 737         int prev, index;
 738         int i, loc;
 739         int err;
 740         u8 port = gid[5];
 741         bool removed_entry = false;
 742
 743         mailbox = mlx4_alloc_cmd_mailbox(dev);
 744         if (IS_ERR(mailbox))
 745                 return PTR_ERR(mailbox);
 746         mgm = mailbox->buf;
 747
 748         mutex_lock(&priv->mcg_table.mutex);
 749
 750         err = find_entry(dev, port, gid, prot, steer,
 751                          mailbox, &hash, &prev, &index);
 752         if (err)
 753                 goto out;
 754
 755         if (index == -1) {
 756                 mlx4_err(dev, "MGID %pI6 not found\n", gid);
 757                 err = -EINVAL;
 758                 goto out;
 759         }
 760
 761         /* if this pq is also a promisc qp, it shouldn't be removed */
 762         if (prot == MLX4_PROT_ETH &&
 763             check_duplicate_entry(dev, port, steer, index, qp->qpn))
 764                 goto out;
 765
 766         members_count = be32_to_cpu(mgm->members_count) & 0xffffff;
 767         for (loc = -1, i = 0; i < members_count; ++i)
 768                 if ((be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK) == qp->qpn)
 769                         loc = i;
 770
 771         if (loc == -1) {
 772                 mlx4_err(dev, "QP %06x not found in MGM\n", qp->qpn);
 773                 err = -EINVAL;
 774                 goto out;
 775         }
 776
 777
 778         mgm->members_count = cpu_to_be32(--members_count | (u32) prot << 30);
 779         mgm->qp[loc]       = mgm->qp[i - 1];
 780         mgm->qp[i - 1]     = 0;
 781
 782         if (prot == MLX4_PROT_ETH)
 783                 removed_entry = can_remove_steering_entry(dev, port, steer,
 784                                                                 index, qp->qpn);
 785         if (i != 1 && (prot != MLX4_PROT_ETH || !removed_entry)) {
 786                 err = mlx4_WRITE_ENTRY(dev, index, mailbox);
 787                 goto out;
 788         }
 789
 790         /* We are going to delete the entry, members count should be 0 */
 791         mgm->members_count = cpu_to_be32((u32) prot << 30);
 792
 793         if (prev == -1) {
 794                 /* Remove entry from MGM */
 795                 int amgm_index = be32_to_cpu(mgm->next_gid_index) >> 6;
 796                 if (amgm_index) {
 797                         err = mlx4_READ_ENTRY(dev, amgm_index, mailbox);
 798                         if (err)
 799                                 goto out;
 800                 } else
 801                         memset(mgm->gid, 0, 16);
 802
 803                 err = mlx4_WRITE_ENTRY(dev, index, mailbox);
 804                 if (err)
 805                         goto out;
 806
 807                 if (amgm_index) {
 808                         if (amgm_index < dev->caps.num_mgms)
 809                                 mlx4_warn(dev, "MGM entry %d had AMGM index %d < %d",
 810                                           index, amgm_index, dev->caps.num_mgms);
 811                         else
 812                                 mlx4_bitmap_free(&priv->mcg_table.bitmap,
 813                                                  amgm_index - dev->caps.num_mgms);
 814                 }
 815         } else {
 816                 /* Remove entry from AMGM */
 817                 int cur_next_index = be32_to_cpu(mgm->next_gid_index) >> 6;
 818                 err = mlx4_READ_ENTRY(dev, prev, mailbox);
 819                 if (err)
 820                         goto out;
 821
 822                 mgm->next_gid_index = cpu_to_be32(cur_next_index << 6);
 823
 824                 err = mlx4_WRITE_ENTRY(dev, prev, mailbox);
 825                 if (err)
 826                         goto out;
 827
 828                 if (index < dev->caps.num_mgms)
 829                         mlx4_warn(dev, "entry %d had next AMGM index %d < %d",
 830                                   prev, index, dev->caps.num_mgms);
 831                 else
 832                         mlx4_bitmap_free(&priv->mcg_table.bitmap,
 833                                          index - dev->caps.num_mgms);
 834         }
 835
 836 out:
 837         mutex_unlock(&priv->mcg_table.mutex);
 838
 839         mlx4_free_cmd_mailbox(dev, mailbox);
 840         return err;
 841 }
 842
 843 static int mlx4_QP_ATTACH(struct mlx4_dev *dev, struct mlx4_qp *qp,
 844                           u8 gid[16], u8 attach, u8 block_loopback,
 845                           enum mlx4_protocol prot)
 846 {
 847         struct mlx4_cmd_mailbox *mailbox;
 848         int err = 0;
 849         int qpn;
 850
 851         if (!mlx4_is_mfunc(dev))
 852                 return -EBADF;
 853
 854         mailbox = mlx4_alloc_cmd_mailbox(dev);
 855         if (IS_ERR(mailbox))
 856                 return PTR_ERR(mailbox);
 857
 858         memcpy(mailbox->buf, gid, 16);
 859         qpn = qp->qpn;
 860         qpn |= (prot << 28);
 861         if (attach && block_loopback)
 862                 qpn |= (1 << 31);
 863
 864         err = mlx4_cmd(dev, mailbox->dma, qpn, attach,
 865                        MLX4_CMD_QP_ATTACH, MLX4_CMD_TIME_CLASS_A,
 866                        MLX4_CMD_WRAPPED);
 867
 868         mlx4_free_cmd_mailbox(dev, mailbox);
 869         return err;
 870 }
 871
 872 int mlx4_multicast_attach(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16],
 873                           int block_mcast_loopback, enum mlx4_protocol prot)
 874 {
 875         enum mlx4_steer_type steer;
 876
 877         steer = (is_valid_ether_addr(&gid[10])) ? MLX4_UC_STEER : MLX4_MC_STEER;
 878
 879         if (prot == MLX4_PROT_ETH &&
 880                         !(dev->caps.flags & MLX4_DEV_CAP_FLAG_VEP_MC_STEER))
 881                 return 0;
 882
 883         if (prot == MLX4_PROT_ETH)
 884                 gid[7] |= (steer << 1);
 885
 886         if (mlx4_is_mfunc(dev))
 887                 return mlx4_QP_ATTACH(dev, qp, gid, 1,
 888                                         block_mcast_loopback, prot);
 889
 890         return mlx4_qp_attach_common(dev, qp, gid, block_mcast_loopback,
 891                                         prot, steer);
 892 }
 893 EXPORT_SYMBOL_GPL(mlx4_multicast_attach);
 894
 895 int mlx4_multicast_detach(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16],
 896                           enum mlx4_protocol prot)
 897 {
 898         enum mlx4_steer_type steer;
 899
 900         steer = (is_valid_ether_addr(&gid[10])) ? MLX4_UC_STEER : MLX4_MC_STEER;
 901
 902         if (prot == MLX4_PROT_ETH &&
 903                         !(dev->caps.flags & MLX4_DEV_CAP_FLAG_VEP_MC_STEER))
 904                 return 0;
 905
 906         if (prot == MLX4_PROT_ETH)
 907                 gid[7] |= (steer << 1);
 908
 909         if (mlx4_is_mfunc(dev))
 910                 return mlx4_QP_ATTACH(dev, qp, gid, 0, 0, prot);
 911
 912         return mlx4_qp_detach_common(dev, qp, gid, prot, steer);
 913 }
 914 EXPORT_SYMBOL_GPL(mlx4_multicast_detach);
 915
 916 int mlx4_unicast_attach(struct mlx4_dev *dev,
 917                         struct mlx4_qp *qp, u8 gid[16],
 918                         int block_mcast_loopback, enum mlx4_protocol prot)
 919 {
 920         if (prot == MLX4_PROT_ETH &&
 921                         !(dev->caps.flags & MLX4_DEV_CAP_FLAG_VEP_UC_STEER))
 922                 return 0;
 923
 924         if (prot == MLX4_PROT_ETH)
 925                 gid[7] |= (MLX4_UC_STEER << 1);
 926
 927         if (mlx4_is_mfunc(dev))
 928                 return mlx4_QP_ATTACH(dev, qp, gid, 1,
 929                                         block_mcast_loopback, prot);
 930
 931         return mlx4_qp_attach_common(dev, qp, gid, block_mcast_loopback,
 932                                         prot, MLX4_UC_STEER);
 933 }
 934 EXPORT_SYMBOL_GPL(mlx4_unicast_attach);
 935
 936 int mlx4_unicast_detach(struct mlx4_dev *dev, struct mlx4_qp *qp,
 937                                u8 gid[16], enum mlx4_protocol prot)
 938 {
 939         if (prot == MLX4_PROT_ETH &&
 940                         !(dev->caps.flags & MLX4_DEV_CAP_FLAG_VEP_UC_STEER))
 941                 return 0;
 942
 943         if (prot == MLX4_PROT_ETH)
 944                 gid[7] |= (MLX4_UC_STEER << 1);
 945
 946         if (mlx4_is_mfunc(dev))
 947                 return mlx4_QP_ATTACH(dev, qp, gid, 0, 0, prot);
 948
 949         return mlx4_qp_detach_common(dev, qp, gid, prot, MLX4_UC_STEER);
 950 }
 951 EXPORT_SYMBOL_GPL(mlx4_unicast_detach);
 952
 953 int mlx4_PROMISC_wrapper(struct mlx4_dev *dev, int slave,
 954                          struct mlx4_vhcr *vhcr,
 955                          struct mlx4_cmd_mailbox *inbox,
 956                          struct mlx4_cmd_mailbox *outbox,
 957                          struct mlx4_cmd_info *cmd)
 958 {
 959         u32 qpn = (u32) vhcr->in_param & 0xffffffff;
 960         u8 port = vhcr->in_param >> 62;
 961         enum mlx4_steer_type steer = vhcr->in_modifier;
 962
 963         /* Promiscuous unicast is not allowed in mfunc */
 964         if (mlx4_is_mfunc(dev) && steer == MLX4_UC_STEER)
 965                 return 0;
 966
 967         if (vhcr->op_modifier)
 968                 return add_promisc_qp(dev, port, steer, qpn);
 969         else
 970                 return remove_promisc_qp(dev, port, steer, qpn);
 971 }
 972
 973 static int mlx4_PROMISC(struct mlx4_dev *dev, u32 qpn,
 974                         enum mlx4_steer_type steer, u8 add, u8 port)
 975 {
 976         return mlx4_cmd(dev, (u64) qpn | (u64) port << 62, (u32) steer, add,
 977                         MLX4_CMD_PROMISC, MLX4_CMD_TIME_CLASS_A,
 978                         MLX4_CMD_WRAPPED);
 979 }
 980
 981 int mlx4_multicast_promisc_add(struct mlx4_dev *dev, u32 qpn, u8 port)
 982 {
 983         if (!(dev->caps.flags & MLX4_DEV_CAP_FLAG_VEP_MC_STEER))
 984                 return 0;
 985
 986         if (mlx4_is_mfunc(dev))
 987                 return mlx4_PROMISC(dev, qpn, MLX4_MC_STEER, 1, port);
 988
 989         return add_promisc_qp(dev, port, MLX4_MC_STEER, qpn);
 990 }
 991 EXPORT_SYMBOL_GPL(mlx4_multicast_promisc_add);
 992
 993 int mlx4_multicast_promisc_remove(struct mlx4_dev *dev, u32 qpn, u8 port)
 994 {
 995         if (!(dev->caps.flags & MLX4_DEV_CAP_FLAG_VEP_MC_STEER))
 996                 return 0;
 997
 998         if (mlx4_is_mfunc(dev))
 999                 return mlx4_PROMISC(dev, qpn, MLX4_MC_STEER, 0, port);
1000
1001         return remove_promisc_qp(dev, port, MLX4_MC_STEER, qpn);
1002 }
1003 EXPORT_SYMBOL_GPL(mlx4_multicast_promisc_remove);
1004
1005 int mlx4_unicast_promisc_add(struct mlx4_dev *dev, u32 qpn, u8 port)
1006 {
1007         if (!(dev->caps.flags & MLX4_DEV_CAP_FLAG_VEP_UC_STEER))
1008                 return 0;
1009
1010         if (mlx4_is_mfunc(dev))
1011                 return mlx4_PROMISC(dev, qpn, MLX4_UC_STEER, 1, port);
1012
1013         return add_promisc_qp(dev, port, MLX4_UC_STEER, qpn);
1014 }
1015 EXPORT_SYMBOL_GPL(mlx4_unicast_promisc_add);
1016
1017 int mlx4_unicast_promisc_remove(struct mlx4_dev *dev, u32 qpn, u8 port)
1018 {
1019         if (!(dev->caps.flags & MLX4_DEV_CAP_FLAG_VEP_UC_STEER))
1020                 return 0;
1021
1022         if (mlx4_is_mfunc(dev))
1023                 return mlx4_PROMISC(dev, qpn, MLX4_UC_STEER, 0, port);
1024
1025         return remove_promisc_qp(dev, port, MLX4_UC_STEER, qpn);
1026 }
1027 EXPORT_SYMBOL_GPL(mlx4_unicast_promisc_remove);
1028
1029 int mlx4_init_mcg_table(struct mlx4_dev *dev)
1030 {
1031         struct mlx4_priv *priv = mlx4_priv(dev);
1032         int err;
1033
1034         err = mlx4_bitmap_init(&priv->mcg_table.bitmap, dev->caps.num_amgms,
1035                                dev->caps.num_amgms - 1, 0, 0);
1036         if (err)
1037                 return err;
1038
1039         mutex_init(&priv->mcg_table.mutex);
1040
1041         return 0;
1042 }
1043
1044 void mlx4_cleanup_mcg_table(struct mlx4_dev *dev)
1045 {
1046         mlx4_bitmap_cleanup(&mlx4_priv(dev)->mcg_table.bitmap);
1047 }