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 static int mlx4_READ_ENTRY(struct mlx4_dev *dev, int index,
  48                            struct mlx4_cmd_mailbox *mailbox)
  49 {
  50         return mlx4_cmd_box(dev, 0, mailbox->dma, index, 0, MLX4_CMD_READ_MCG,
  51                             MLX4_CMD_TIME_CLASS_A);
  52 }
  53
  54 static int mlx4_WRITE_ENTRY(struct mlx4_dev *dev, int index,
  55                             struct mlx4_cmd_mailbox *mailbox)
  56 {
  57         return mlx4_cmd(dev, mailbox->dma, index, 0, MLX4_CMD_WRITE_MCG,
  58                         MLX4_CMD_TIME_CLASS_A);
  59 }
  60
  61 static int mlx4_WRITE_PROMISC(struct mlx4_dev *dev, u8 vep_num, u8 port, u8 steer,
  62                               struct mlx4_cmd_mailbox *mailbox)
  63 {
  64         u32 in_mod;
  65
  66         in_mod = (u32) vep_num << 24 | (u32) port << 16 | steer << 1;
  67         return mlx4_cmd(dev, mailbox->dma, in_mod, 0x1,
  68                         MLX4_CMD_WRITE_MCG, MLX4_CMD_TIME_CLASS_A);
  69 }
  70
  71 static int mlx4_GID_HASH(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
  72                          u16 *hash, u8 op_mod)
  73 {
  74         u64 imm;
  75         int err;
  76
  77         err = mlx4_cmd_imm(dev, mailbox->dma, &imm, 0, op_mod,
  78                            MLX4_CMD_MGID_HASH, MLX4_CMD_TIME_CLASS_A);
  79
  80         if (!err)
  81                 *hash = imm;
  82
  83         return err;
  84 }
  85
  86 static struct mlx4_promisc_qp *get_promisc_qp(struct mlx4_dev *dev, u8 pf_num,
  87                                               enum mlx4_steer_type steer,
  88                                               u32 qpn)
  89 {
  90         struct mlx4_steer *s_steer = &mlx4_priv(dev)->steer[pf_num];
  91         struct mlx4_promisc_qp *pqp;
  92
  93         list_for_each_entry(pqp, &s_steer->promisc_qps[steer], list) {
  94                 if (pqp->qpn == qpn)
  95                         return pqp;
  96         }
  97         /* not found */
  98         return NULL;
  99 }
 100
 101 /*
 102  * Add new entry to steering data structure.
 103  * All promisc QPs should be added as well
 104  */
 105 static int new_steering_entry(struct mlx4_dev *dev, u8 vep_num, u8 port,
 106                               enum mlx4_steer_type steer,
 107                               unsigned int index, u32 qpn)
 108 {
 109         struct mlx4_steer *s_steer;
 110         struct mlx4_cmd_mailbox *mailbox;
 111         struct mlx4_mgm *mgm;
 112         u32 members_count;
 113         struct mlx4_steer_index *new_entry;
 114         struct mlx4_promisc_qp *pqp;
 115         struct mlx4_promisc_qp *dqp = NULL;
 116         u32 prot;
 117         int err;
 118         u8 pf_num;
 119
 120         pf_num = (dev->caps.num_ports == 1) ? vep_num : (vep_num << 1) | (port - 1);
 121         s_steer = &mlx4_priv(dev)->steer[pf_num];
 122         new_entry = kzalloc(sizeof *new_entry, GFP_KERNEL);
 123         if (!new_entry)
 124                 return -ENOMEM;
 125
 126         INIT_LIST_HEAD(&new_entry->duplicates);
 127         new_entry->index = index;
 128         list_add_tail(&new_entry->list, &s_steer->steer_entries[steer]);
 129
 130         /* If the given qpn is also a promisc qp,
 131          * it should be inserted to duplicates list
 132          */
 133         pqp = get_promisc_qp(dev, pf_num, steer, qpn);
 134         if (pqp) {
 135                 dqp = kmalloc(sizeof *dqp, GFP_KERNEL);
 136                 if (!dqp) {
 137                         err = -ENOMEM;
 138                         goto out_alloc;
 139                 }
 140                 dqp->qpn = qpn;
 141                 list_add_tail(&dqp->list, &new_entry->duplicates);
 142         }
 143
 144         /* if no promisc qps for this vep, we are done */
 145         if (list_empty(&s_steer->promisc_qps[steer]))
 146                 return 0;
 147
 148         /* now need to add all the promisc qps to the new
 149          * steering entry, as they should also receive the packets
 150          * destined to this address */
 151         mailbox = mlx4_alloc_cmd_mailbox(dev);
 152         if (IS_ERR(mailbox)) {
 153                 err = -ENOMEM;
 154                 goto out_alloc;
 155         }
 156         mgm = mailbox->buf;
 157
 158         err = mlx4_READ_ENTRY(dev, index, mailbox);
 159         if (err)
 160                 goto out_mailbox;
 161
 162         members_count = be32_to_cpu(mgm->members_count) & 0xffffff;
 163         prot = be32_to_cpu(mgm->members_count) >> 30;
 164         list_for_each_entry(pqp, &s_steer->promisc_qps[steer], list) {
 165                 /* don't add already existing qpn */
 166                 if (pqp->qpn == qpn)
 167                         continue;
 168                 if (members_count == MLX4_QP_PER_MGM) {
 169                         /* out of space */
 170                         err = -ENOMEM;
 171                         goto out_mailbox;
 172                 }
 173
 174                 /* add the qpn */
 175                 mgm->qp[members_count++] = cpu_to_be32(pqp->qpn & MGM_QPN_MASK);
 176         }
 177         /* update the qps count and update the entry with all the promisc qps*/
 178         mgm->members_count = cpu_to_be32(members_count | (prot << 30));
 179         err = mlx4_WRITE_ENTRY(dev, index, mailbox);
 180
 181 out_mailbox:
 182         mlx4_free_cmd_mailbox(dev, mailbox);
 183         if (!err)
 184                 return 0;
 185 out_alloc:
 186         if (dqp) {
 187                 list_del(&dqp->list);
 188                 kfree(dqp);
 189         }
 190         list_del(&new_entry->list);
 191         kfree(new_entry);
 192         return err;
 193 }
 194
 195 /* update the data structures with existing steering entry */
 196 static int existing_steering_entry(struct mlx4_dev *dev, u8 vep_num, u8 port,
 197                                    enum mlx4_steer_type steer,
 198                                    unsigned int index, u32 qpn)
 199 {
 200         struct mlx4_steer *s_steer;
 201         struct mlx4_steer_index *tmp_entry, *entry = NULL;
 202         struct mlx4_promisc_qp *pqp;
 203         struct mlx4_promisc_qp *dqp;
 204         u8 pf_num;
 205
 206         pf_num = (dev->caps.num_ports == 1) ? vep_num : (vep_num << 1) | (port - 1);
 207         s_steer = &mlx4_priv(dev)->steer[pf_num];
 208
 209         pqp = get_promisc_qp(dev, pf_num, steer, qpn);
 210         if (!pqp)
 211                 return 0; /* nothing to do */
 212
 213         list_for_each_entry(tmp_entry, &s_steer->steer_entries[steer], list) {
 214                 if (tmp_entry->index == index) {
 215                         entry = tmp_entry;
 216                         break;
 217                 }
 218         }
 219         if (unlikely(!entry)) {
 220                 mlx4_warn(dev, "Steering entry at index %x is not registered\n", index);
 221                 return -EINVAL;
 222         }
 223
 224         /* the given qpn is listed as a promisc qpn
 225          * we need to add it as a duplicate to this entry
 226          * for future references */
 227         list_for_each_entry(dqp, &entry->duplicates, list) {
 228                 if (qpn == dqp->qpn)
 229                         return 0; /* qp is already duplicated */
 230         }
 231
 232         /* add the qp as a duplicate on this index */
 233         dqp = kmalloc(sizeof *dqp, GFP_KERNEL);
 234         if (!dqp)
 235                 return -ENOMEM;
 236         dqp->qpn = qpn;
 237         list_add_tail(&dqp->list, &entry->duplicates);
 238
 239         return 0;
 240 }
 241
 242 /* Check whether a qpn is a duplicate on steering entry
 243  * If so, it should not be removed from mgm */
 244 static bool check_duplicate_entry(struct mlx4_dev *dev, u8 vep_num, u8 port,
 245                                   enum mlx4_steer_type steer,
 246                                   unsigned int index, u32 qpn)
 247 {
 248         struct mlx4_steer *s_steer;
 249         struct mlx4_steer_index *tmp_entry, *entry = NULL;
 250         struct mlx4_promisc_qp *dqp, *tmp_dqp;
 251         u8 pf_num;
 252
 253         pf_num = (dev->caps.num_ports == 1) ? vep_num : (vep_num << 1) | (port - 1);
 254         s_steer = &mlx4_priv(dev)->steer[pf_num];
 255
 256         /* if qp is not promisc, it cannot be duplicated */
 257         if (!get_promisc_qp(dev, pf_num, steer, qpn))
 258                 return false;
 259
 260         /* The qp is promisc qp so it is a duplicate on this index
 261          * Find the index entry, and remove the duplicate */
 262         list_for_each_entry(tmp_entry, &s_steer->steer_entries[steer], list) {
 263                 if (tmp_entry->index == index) {
 264                         entry = tmp_entry;
 265                         break;
 266                 }
 267         }
 268         if (unlikely(!entry)) {
 269                 mlx4_warn(dev, "Steering entry for index %x is not registered\n", index);
 270                 return false;
 271         }
 272         list_for_each_entry_safe(dqp, tmp_dqp, &entry->duplicates, list) {
 273                 if (dqp->qpn == qpn) {
 274                         list_del(&dqp->list);
 275                         kfree(dqp);
 276                 }
 277         }
 278         return true;
 279 }
 280
 281 /* I a steering entry contains only promisc QPs, it can be removed. */
 282 static bool can_remove_steering_entry(struct mlx4_dev *dev, u8 vep_num, u8 port,
 283                                       enum mlx4_steer_type steer,
 284                                       unsigned int index, u32 tqpn)
 285 {
 286         struct mlx4_steer *s_steer;
 287         struct mlx4_cmd_mailbox *mailbox;
 288         struct mlx4_mgm *mgm;
 289         struct mlx4_steer_index *entry = NULL, *tmp_entry;
 290         u32 qpn;
 291         u32 members_count;
 292         bool ret = false;
 293         int i;
 294         u8 pf_num;
 295
 296         pf_num = (dev->caps.num_ports == 1) ? vep_num : (vep_num << 1) | (port - 1);
 297         s_steer = &mlx4_priv(dev)->steer[pf_num];
 298
 299         mailbox = mlx4_alloc_cmd_mailbox(dev);
 300         if (IS_ERR(mailbox))
 301                 return false;
 302         mgm = mailbox->buf;
 303
 304         if (mlx4_READ_ENTRY(dev, index, mailbox))
 305                 goto out;
 306         members_count = be32_to_cpu(mgm->members_count) & 0xffffff;
 307         for (i = 0;  i < members_count; i++) {
 308                 qpn = be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK;
 309                 if (!get_promisc_qp(dev, pf_num, steer, qpn) && qpn != tqpn) {
 310                         /* the qp is not promisc, the entry can't be removed */
 311                         goto out;
 312                 }
 313         }
 314          /* All the qps currently registered for this entry are promiscuous,
 315           * Checking for duplicates */
 316         ret = true;
 317         list_for_each_entry_safe(entry, tmp_entry, &s_steer->steer_entries[steer], list) {
 318                 if (entry->index == index) {
 319                         if (list_empty(&entry->duplicates)) {
 320                                 list_del(&entry->list);
 321                                 kfree(entry);
 322                         } else {
 323                                 /* This entry contains duplicates so it shouldn't be removed */
 324                                 ret = false;
 325                                 goto out;
 326                         }
 327                 }
 328         }
 329
 330 out:
 331         mlx4_free_cmd_mailbox(dev, mailbox);
 332         return ret;
 333 }
 334
 335 static int add_promisc_qp(struct mlx4_dev *dev, u8 vep_num, u8 port,
 336                           enum mlx4_steer_type steer, u32 qpn)
 337 {
 338         struct mlx4_steer *s_steer;
 339         struct mlx4_cmd_mailbox *mailbox;
 340         struct mlx4_mgm *mgm;
 341         struct mlx4_steer_index *entry;
 342         struct mlx4_promisc_qp *pqp;
 343         struct mlx4_promisc_qp *dqp;
 344         u32 members_count;
 345         u32 prot;
 346         int i;
 347         bool found;
 348         int last_index;
 349         int err;
 350         u8 pf_num;
 351         struct mlx4_priv *priv = mlx4_priv(dev);
 352         pf_num = (dev->caps.num_ports == 1) ? vep_num : (vep_num << 1) | (port - 1);
 353         s_steer = &mlx4_priv(dev)->steer[pf_num];
 354
 355         mutex_lock(&priv->mcg_table.mutex);
 356
 357         if (get_promisc_qp(dev, pf_num, steer, qpn)) {
 358                 err = 0;  /* Noting to do, already exists */
 359                 goto out_mutex;
 360         }
 361
 362         pqp = kmalloc(sizeof *pqp, GFP_KERNEL);
 363         if (!pqp) {
 364                 err = -ENOMEM;
 365                 goto out_mutex;
 366         }
 367         pqp->qpn = qpn;
 368
 369         mailbox = mlx4_alloc_cmd_mailbox(dev);
 370         if (IS_ERR(mailbox)) {
 371                 err = -ENOMEM;
 372                 goto out_alloc;
 373         }
 374         mgm = mailbox->buf;
 375
 376         /* the promisc qp needs to be added for each one of the steering
 377          * entries, if it already exists, needs to be added as a duplicate
 378          * for this entry */
 379         list_for_each_entry(entry, &s_steer->steer_entries[steer], list) {
 380                 err = mlx4_READ_ENTRY(dev, entry->index, mailbox);
 381                 if (err)
 382                         goto out_mailbox;
 383
 384                 members_count = be32_to_cpu(mgm->members_count) & 0xffffff;
 385                 prot = be32_to_cpu(mgm->members_count) >> 30;
 386                 found = false;
 387                 for (i = 0; i < members_count; i++) {
 388                         if ((be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK) == qpn) {
 389                                 /* Entry already exists, add to duplicates */
 390                                 dqp = kmalloc(sizeof *dqp, GFP_KERNEL);
 391                                 if (!dqp)
 392                                         goto out_mailbox;
 393                                 dqp->qpn = qpn;
 394                                 list_add_tail(&dqp->list, &entry->duplicates);
 395                                 found = true;
 396                         }
 397                 }
 398                 if (!found) {
 399                         /* Need to add the qpn to mgm */
 400                         if (members_count == MLX4_QP_PER_MGM) {
 401                                 /* entry is full */
 402                                 err = -ENOMEM;
 403                                 goto out_mailbox;
 404                         }
 405                         mgm->qp[members_count++] = cpu_to_be32(qpn & MGM_QPN_MASK);
 406                         mgm->members_count = cpu_to_be32(members_count | (prot << 30));
 407                         err = mlx4_WRITE_ENTRY(dev, entry->index, mailbox);
 408                         if (err)
 409                                 goto out_mailbox;
 410                 }
 411                 last_index = entry->index;
 412         }
 413
 414         /* add the new qpn to list of promisc qps */
 415         list_add_tail(&pqp->list, &s_steer->promisc_qps[steer]);
 416         /* now need to add all the promisc qps to default entry */
 417         memset(mgm, 0, sizeof *mgm);
 418         members_count = 0;
 419         list_for_each_entry(dqp, &s_steer->promisc_qps[steer], list)
 420                 mgm->qp[members_count++] = cpu_to_be32(dqp->qpn & MGM_QPN_MASK);
 421         mgm->members_count = cpu_to_be32(members_count | MLX4_PROT_ETH << 30);
 422
 423         err = mlx4_WRITE_PROMISC(dev, vep_num, port, steer, mailbox);
 424         if (err)
 425                 goto out_list;
 426
 427         mlx4_free_cmd_mailbox(dev, mailbox);
 428         mutex_unlock(&priv->mcg_table.mutex);
 429         return 0;
 430
 431 out_list:
 432         list_del(&pqp->list);
 433 out_mailbox:
 434         mlx4_free_cmd_mailbox(dev, mailbox);
 435 out_alloc:
 436         kfree(pqp);
 437 out_mutex:
 438         mutex_unlock(&priv->mcg_table.mutex);
 439         return err;
 440 }
 441
 442 static int remove_promisc_qp(struct mlx4_dev *dev, u8 vep_num, u8 port,
 443                              enum mlx4_steer_type steer, u32 qpn)
 444 {
 445         struct mlx4_priv *priv = mlx4_priv(dev);
 446         struct mlx4_steer *s_steer;
 447         struct mlx4_cmd_mailbox *mailbox;
 448         struct mlx4_mgm *mgm;
 449         struct mlx4_steer_index *entry;
 450         struct mlx4_promisc_qp *pqp;
 451         struct mlx4_promisc_qp *dqp;
 452         u32 members_count;
 453         bool found;
 454         bool back_to_list = false;
 455         int loc, i;
 456         int err;
 457         u8 pf_num;
 458
 459         pf_num = (dev->caps.num_ports == 1) ? vep_num : (vep_num << 1) | (port - 1);
 460         s_steer = &mlx4_priv(dev)->steer[pf_num];
 461         mutex_lock(&priv->mcg_table.mutex);
 462
 463         pqp = get_promisc_qp(dev, pf_num, steer, qpn);
 464         if (unlikely(!pqp)) {
 465                 mlx4_warn(dev, "QP %x is not promiscuous QP\n", qpn);
 466                 /* nothing to do */
 467                 err = 0;
 468                 goto out_mutex;
 469         }
 470
 471         /*remove from list of promisc qps */
 472         list_del(&pqp->list);
 473
 474         /* set the default entry not to include the removed one */
 475         mailbox = mlx4_alloc_cmd_mailbox(dev);
 476         if (IS_ERR(mailbox)) {
 477                 err = -ENOMEM;
 478                 back_to_list = true;
 479                 goto out_list;
 480         }
 481         mgm = mailbox->buf;
 482         members_count = 0;
 483         list_for_each_entry(dqp, &s_steer->promisc_qps[steer], list)
 484                 mgm->qp[members_count++] = cpu_to_be32(dqp->qpn & MGM_QPN_MASK);
 485         mgm->members_count = cpu_to_be32(members_count | MLX4_PROT_ETH << 30);
 486
 487         err = mlx4_WRITE_PROMISC(dev, vep_num, port, steer, mailbox);
 488         if (err)
 489                 goto out_mailbox;
 490
 491         /* remove the qp from all the steering entries*/
 492         list_for_each_entry(entry, &s_steer->steer_entries[steer], list) {
 493                 found = false;
 494                 list_for_each_entry(dqp, &entry->duplicates, list) {
 495                         if (dqp->qpn == qpn) {
 496                                 found = true;
 497                                 break;
 498                         }
 499                 }
 500                 if (found) {
 501                         /* a duplicate, no need to change the mgm,
 502                          * only update the duplicates list */
 503                         list_del(&dqp->list);
 504                         kfree(dqp);
 505                 } else {
 506                         err = mlx4_READ_ENTRY(dev, entry->index, mailbox);
 507                                 if (err)
 508                                         goto out_mailbox;
 509                         members_count = be32_to_cpu(mgm->members_count) & 0xffffff;
 510                         for (loc = -1, i = 0; i < members_count; ++i)
 511                                 if ((be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK) == qpn)
 512                                         loc = i;
 513
 514                         mgm->members_count = cpu_to_be32(--members_count |
 515                                                          (MLX4_PROT_ETH << 30));
 516                         mgm->qp[loc] = mgm->qp[i - 1];
 517                         mgm->qp[i - 1] = 0;
 518
 519                         err = mlx4_WRITE_ENTRY(dev, entry->index, mailbox);
 520                                 if (err)
 521                                         goto out_mailbox;
 522                 }
 523
 524         }
 525
 526 out_mailbox:
 527         mlx4_free_cmd_mailbox(dev, mailbox);
 528 out_list:
 529         if (back_to_list)
 530                 list_add_tail(&pqp->list, &s_steer->promisc_qps[steer]);
 531         else
 532                 kfree(pqp);
 533 out_mutex:
 534         mutex_unlock(&priv->mcg_table.mutex);
 535         return err;
 536 }
 537
 538 /*
 539  * Caller must hold MCG table semaphore.  gid and mgm parameters must
 540  * be properly aligned for command interface.
 541  *
 542  *  Returns 0 unless a firmware command error occurs.
 543  *
 544  * If GID is found in MGM or MGM is empty, *index = *hash, *prev = -1
 545  * and *mgm holds MGM entry.
 546  *
 547  * if GID is found in AMGM, *index = index in AMGM, *prev = index of
 548  * previous entry in hash chain and *mgm holds AMGM entry.
 549  *
 550  * If no AMGM exists for given gid, *index = -1, *prev = index of last
 551  * entry in hash chain and *mgm holds end of hash chain.
 552  */
 553 static int find_entry(struct mlx4_dev *dev, u8 port,
 554                       u8 *gid, enum mlx4_protocol prot,
 555                       enum mlx4_steer_type steer,
 556                       struct mlx4_cmd_mailbox *mgm_mailbox,
 557                       u16 *hash, int *prev, int *index)
 558 {
 559         struct mlx4_cmd_mailbox *mailbox;
 560         struct mlx4_mgm *mgm = mgm_mailbox->buf;
 561         u8 *mgid;
 562         int err;
 563         u8 op_mod = (prot == MLX4_PROT_ETH) ?
 564                 !!(dev->caps.flags & MLX4_DEV_CAP_FLAG_VEP_MC_STEER) : 0;
 565
 566         mailbox = mlx4_alloc_cmd_mailbox(dev);
 567         if (IS_ERR(mailbox))
 568                 return -ENOMEM;
 569         mgid = mailbox->buf;
 570
 571         memcpy(mgid, gid, 16);
 572
 573         err = mlx4_GID_HASH(dev, mailbox, hash, op_mod);
 574         mlx4_free_cmd_mailbox(dev, mailbox);
 575         if (err)
 576                 return err;
 577
 578         if (0)
 579                 mlx4_dbg(dev, "Hash for %pI6 is %04x\n", gid, *hash);
 580
 581         *index = *hash;
 582         *prev  = -1;
 583
 584         do {
 585                 err = mlx4_READ_ENTRY(dev, *index, mgm_mailbox);
 586                 if (err)
 587                         return err;
 588
 589                 if (!(be32_to_cpu(mgm->members_count) & 0xffffff)) {
 590                         if (*index != *hash) {
 591                                 mlx4_err(dev, "Found zero MGID in AMGM.\n");
 592                                 err = -EINVAL;
 593                         }
 594                         return err;
 595                 }
 596
 597                 if (!memcmp(mgm->gid, gid, 16) &&
 598                     be32_to_cpu(mgm->members_count) >> 30 == prot)
 599                         return err;
 600
 601                 *prev = *index;
 602                 *index = be32_to_cpu(mgm->next_gid_index) >> 6;
 603         } while (*index);
 604
 605         *index = -1;
 606         return err;
 607 }
 608
 609 int mlx4_qp_attach_common(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16],
 610                           int block_mcast_loopback, enum mlx4_protocol prot,
 611                           enum mlx4_steer_type steer)
 612 {
 613         struct mlx4_priv *priv = mlx4_priv(dev);
 614         struct mlx4_cmd_mailbox *mailbox;
 615         struct mlx4_mgm *mgm;
 616         u32 members_count;
 617         u16 hash;
 618         int index, prev;
 619         int link = 0;
 620         int i;
 621         int err;
 622         u8 port = gid[5];
 623         u8 new_entry = 0;
 624
 625         mailbox = mlx4_alloc_cmd_mailbox(dev);
 626         if (IS_ERR(mailbox))
 627                 return PTR_ERR(mailbox);
 628         mgm = mailbox->buf;
 629
 630         mutex_lock(&priv->mcg_table.mutex);
 631         err = find_entry(dev, port, gid, prot, steer,
 632                          mailbox, &hash, &prev, &index);
 633         if (err)
 634                 goto out;
 635
 636         if (index != -1) {
 637                 if (!(be32_to_cpu(mgm->members_count) & 0xffffff)) {
 638                         new_entry = 1;
 639                         memcpy(mgm->gid, gid, 16);
 640                 }
 641         } else {
 642                 link = 1;
 643
 644                 index = mlx4_bitmap_alloc(&priv->mcg_table.bitmap);
 645                 if (index == -1) {
 646                         mlx4_err(dev, "No AMGM entries left\n");
 647                         err = -ENOMEM;
 648                         goto out;
 649                 }
 650                 index += dev->caps.num_mgms;
 651
 652                 memset(mgm, 0, sizeof *mgm);
 653                 memcpy(mgm->gid, gid, 16);
 654         }
 655
 656         members_count = be32_to_cpu(mgm->members_count) & 0xffffff;
 657         if (members_count == MLX4_QP_PER_MGM) {
 658                 mlx4_err(dev, "MGM at index %x is full.\n", index);
 659                 err = -ENOMEM;
 660                 goto out;
 661         }
 662
 663         for (i = 0; i < members_count; ++i)
 664                 if ((be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK) == qp->qpn) {
 665                         mlx4_dbg(dev, "QP %06x already a member of MGM\n", qp->qpn);
 666                         err = 0;
 667                         goto out;
 668                 }
 669
 670         if (block_mcast_loopback)
 671                 mgm->qp[members_count++] = cpu_to_be32((qp->qpn & MGM_QPN_MASK) |
 672                                                        (1U << MGM_BLCK_LB_BIT));
 673         else
 674                 mgm->qp[members_count++] = cpu_to_be32(qp->qpn & MGM_QPN_MASK);
 675
 676         mgm->members_count = cpu_to_be32(members_count | (u32) prot << 30);
 677
 678         err = mlx4_WRITE_ENTRY(dev, index, mailbox);
 679         if (err)
 680                 goto out;
 681
 682         if (!link)
 683                 goto out;
 684
 685         err = mlx4_READ_ENTRY(dev, prev, mailbox);
 686         if (err)
 687                 goto out;
 688
 689         mgm->next_gid_index = cpu_to_be32(index << 6);
 690
 691         err = mlx4_WRITE_ENTRY(dev, prev, mailbox);
 692         if (err)
 693                 goto out;
 694
 695 out:
 696         if (prot == MLX4_PROT_ETH) {
 697                 /* manage the steering entry for promisc mode */
 698                 if (new_entry)
 699                         new_steering_entry(dev, 0, port, steer, index, qp->qpn);
 700                 else
 701                         existing_steering_entry(dev, 0, port, steer,
 702                                                 index, qp->qpn);
 703         }
 704         if (err && link && index != -1) {
 705                 if (index < dev->caps.num_mgms)
 706                         mlx4_warn(dev, "Got AMGM index %d < %d",
 707                                   index, dev->caps.num_mgms);
 708                 else
 709                         mlx4_bitmap_free(&priv->mcg_table.bitmap,
 710                                          index - dev->caps.num_mgms);
 711         }
 712         mutex_unlock(&priv->mcg_table.mutex);
 713
 714         mlx4_free_cmd_mailbox(dev, mailbox);
 715         return err;
 716 }
 717
 718 int mlx4_qp_detach_common(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16],
 719                           enum mlx4_protocol prot, enum mlx4_steer_type steer)
 720 {
 721         struct mlx4_priv *priv = mlx4_priv(dev);
 722         struct mlx4_cmd_mailbox *mailbox;
 723         struct mlx4_mgm *mgm;
 724         u32 members_count;
 725         u16 hash;
 726         int prev, index;
 727         int i, loc;
 728         int err;
 729         u8 port = gid[5];
 730         bool removed_entry = false;
 731
 732         mailbox = mlx4_alloc_cmd_mailbox(dev);
 733         if (IS_ERR(mailbox))
 734                 return PTR_ERR(mailbox);
 735         mgm = mailbox->buf;
 736
 737         mutex_lock(&priv->mcg_table.mutex);
 738
 739         err = find_entry(dev, port, gid, prot, steer,
 740                          mailbox, &hash, &prev, &index);
 741         if (err)
 742                 goto out;
 743
 744         if (index == -1) {
 745                 mlx4_err(dev, "MGID %pI6 not found\n", gid);
 746                 err = -EINVAL;
 747                 goto out;
 748         }
 749
 750         /* if this pq is also a promisc qp, it shouldn't be removed */
 751         if (prot == MLX4_PROT_ETH &&
 752             check_duplicate_entry(dev, 0, port, steer, index, qp->qpn))
 753                 goto out;
 754
 755         members_count = be32_to_cpu(mgm->members_count) & 0xffffff;
 756         for (loc = -1, i = 0; i < members_count; ++i)
 757                 if ((be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK) == qp->qpn)
 758                         loc = i;
 759
 760         if (loc == -1) {
 761                 mlx4_err(dev, "QP %06x not found in MGM\n", qp->qpn);
 762                 err = -EINVAL;
 763                 goto out;
 764         }
 765
 766
 767         mgm->members_count = cpu_to_be32(--members_count | (u32) prot << 30);
 768         mgm->qp[loc]       = mgm->qp[i - 1];
 769         mgm->qp[i - 1]     = 0;
 770
 771         if (prot == MLX4_PROT_ETH)
 772                 removed_entry = can_remove_steering_entry(dev, 0, port, steer, index, qp->qpn);
 773         if (i != 1 && (prot != MLX4_PROT_ETH || !removed_entry)) {
 774                 err = mlx4_WRITE_ENTRY(dev, index, mailbox);
 775                 goto out;
 776         }
 777
 778         /* We are going to delete the entry, members count should be 0 */
 779         mgm->members_count = cpu_to_be32((u32) prot << 30);
 780
 781         if (prev == -1) {
 782                 /* Remove entry from MGM */
 783                 int amgm_index = be32_to_cpu(mgm->next_gid_index) >> 6;
 784                 if (amgm_index) {
 785                         err = mlx4_READ_ENTRY(dev, amgm_index, mailbox);
 786                         if (err)
 787                                 goto out;
 788                 } else
 789                         memset(mgm->gid, 0, 16);
 790
 791                 err = mlx4_WRITE_ENTRY(dev, index, mailbox);
 792                 if (err)
 793                         goto out;
 794
 795                 if (amgm_index) {
 796                         if (amgm_index < dev->caps.num_mgms)
 797                                 mlx4_warn(dev, "MGM entry %d had AMGM index %d < %d",
 798                                           index, amgm_index, dev->caps.num_mgms);
 799                         else
 800                                 mlx4_bitmap_free(&priv->mcg_table.bitmap,
 801                                                  amgm_index - dev->caps.num_mgms);
 802                 }
 803         } else {
 804                 /* Remove entry from AMGM */
 805                 int cur_next_index = be32_to_cpu(mgm->next_gid_index) >> 6;
 806                 err = mlx4_READ_ENTRY(dev, prev, mailbox);
 807                 if (err)
 808                         goto out;
 809
 810                 mgm->next_gid_index = cpu_to_be32(cur_next_index << 6);
 811
 812                 err = mlx4_WRITE_ENTRY(dev, prev, mailbox);
 813                 if (err)
 814                         goto out;
 815
 816                 if (index < dev->caps.num_mgms)
 817                         mlx4_warn(dev, "entry %d had next AMGM index %d < %d",
 818                                   prev, index, dev->caps.num_mgms);
 819                 else
 820                         mlx4_bitmap_free(&priv->mcg_table.bitmap,
 821                                          index - dev->caps.num_mgms);
 822         }
 823
 824 out:
 825         mutex_unlock(&priv->mcg_table.mutex);
 826
 827         mlx4_free_cmd_mailbox(dev, mailbox);
 828         return err;
 829 }
 830
 831
 832 int mlx4_multicast_attach(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16],
 833                           int block_mcast_loopback, enum mlx4_protocol prot)
 834 {
 835         enum mlx4_steer_type steer;
 836
 837         steer = (is_valid_ether_addr(&gid[10])) ? MLX4_UC_STEER : MLX4_MC_STEER;
 838
 839         if (prot == MLX4_PROT_ETH &&
 840                         !(dev->caps.flags & MLX4_DEV_CAP_FLAG_VEP_MC_STEER))
 841                 return 0;
 842
 843         if (prot == MLX4_PROT_ETH)
 844                 gid[7] |= (steer << 1);
 845
 846         return mlx4_qp_attach_common(dev, qp, gid,
 847                                      block_mcast_loopback, prot,
 848                                      steer);
 849 }
 850 EXPORT_SYMBOL_GPL(mlx4_multicast_attach);
 851
 852 int mlx4_multicast_detach(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16],
 853                           enum mlx4_protocol prot)
 854 {
 855         enum mlx4_steer_type steer;
 856
 857         steer = (is_valid_ether_addr(&gid[10])) ? MLX4_UC_STEER : MLX4_MC_STEER;
 858
 859         if (prot == MLX4_PROT_ETH &&
 860                         !(dev->caps.flags & MLX4_DEV_CAP_FLAG_VEP_MC_STEER))
 861                 return 0;
 862
 863         if (prot == MLX4_PROT_ETH) {
 864                 gid[7] |= (steer << 1);
 865         }
 866
 867         return mlx4_qp_detach_common(dev, qp, gid, prot, steer);
 868 }
 869 EXPORT_SYMBOL_GPL(mlx4_multicast_detach);
 870
 871
 872 int mlx4_multicast_promisc_add(struct mlx4_dev *dev, u32 qpn, u8 port)
 873 {
 874         if (!(dev->caps.flags & MLX4_DEV_CAP_FLAG_VEP_MC_STEER))
 875                 return 0;
 876
 877
 878         return add_promisc_qp(dev, 0, port, MLX4_MC_STEER, qpn);
 879 }
 880 EXPORT_SYMBOL_GPL(mlx4_multicast_promisc_add);
 881
 882 int mlx4_multicast_promisc_remove(struct mlx4_dev *dev, u32 qpn, u8 port)
 883 {
 884         if (!(dev->caps.flags & MLX4_DEV_CAP_FLAG_VEP_MC_STEER))
 885                 return 0;
 886
 887
 888         return remove_promisc_qp(dev, 0, port, MLX4_MC_STEER, qpn);
 889 }
 890 EXPORT_SYMBOL_GPL(mlx4_multicast_promisc_remove);
 891
 892 int mlx4_unicast_promisc_add(struct mlx4_dev *dev, u32 qpn, u8 port)
 893 {
 894         if (!(dev->caps.flags & MLX4_DEV_CAP_FLAG_VEP_MC_STEER))
 895                 return 0;
 896
 897
 898         return add_promisc_qp(dev, 0, port, MLX4_UC_STEER, qpn);
 899 }
 900 EXPORT_SYMBOL_GPL(mlx4_unicast_promisc_add);
 901
 902 int mlx4_unicast_promisc_remove(struct mlx4_dev *dev, u32 qpn, u8 port)
 903 {
 904         if (!(dev->caps.flags & MLX4_DEV_CAP_FLAG_VEP_MC_STEER))
 905                 return 0;
 906
 907         return remove_promisc_qp(dev, 0, port, MLX4_UC_STEER, qpn);
 908 }
 909 EXPORT_SYMBOL_GPL(mlx4_unicast_promisc_remove);
 910
 911 int mlx4_init_mcg_table(struct mlx4_dev *dev)
 912 {
 913         struct mlx4_priv *priv = mlx4_priv(dev);
 914         int err;
 915
 916         err = mlx4_bitmap_init(&priv->mcg_table.bitmap, dev->caps.num_amgms,
 917                                dev->caps.num_amgms - 1, 0, 0);
 918         if (err)
 919                 return err;
 920
 921         mutex_init(&priv->mcg_table.mutex);
 922
 923         return 0;
 924 }
 925
 926 void mlx4_cleanup_mcg_table(struct mlx4_dev *dev)
 927 {
 928         mlx4_bitmap_cleanup(&mlx4_priv(dev)->mcg_table.bitmap);
 929 }