drivers/net/mlx4/mcg.c

   1 /*
   2  * Copyright (c) 2006, 2007 Cisco Systems, Inc.  All rights reserved.
   3  * Copyright (c) 2007, 2008 Mellanox Technologies. All rights reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the
   9  * OpenIB.org BSD license below:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      - Redistributions of source code must retain the above
  16  *        copyright notice, this list of conditions and the following
  17  *        disclaimer.
  18  *
  19  *      - Redistributions in binary form must reproduce the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer in the documentation and/or other materials
  22  *        provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  */
  33
  34 #include <linux/string.h>
  35 #include <linux/etherdevice.h>
  36
  37 #include <linux/mlx4/cmd.h>
  38
  39 #include "mlx4.h"
  40
  41 #define MGM_QPN_MASK       0x00FFFFFF
  42 #define MGM_BLCK_LB_BIT    30
  43
  44 static const u8 zero_gid[16];   /* automatically initialized to 0 */
  45
  46 static int mlx4_READ_ENTRY(struct mlx4_dev *dev, int index,
  47                            struct mlx4_cmd_mailbox *mailbox)
  48 {
  49         return mlx4_cmd_box(dev, 0, mailbox->dma, index, 0, MLX4_CMD_READ_MCG,
  50                             MLX4_CMD_TIME_CLASS_A);
  51 }
  52
  53 static int mlx4_WRITE_ENTRY(struct mlx4_dev *dev, int index,
  54                             struct mlx4_cmd_mailbox *mailbox)
  55 {
  56         return mlx4_cmd(dev, mailbox->dma, index, 0, MLX4_CMD_WRITE_MCG,
  57                         MLX4_CMD_TIME_CLASS_A);
  58 }
  59
  60 static int mlx4_WRITE_PROMISC(struct mlx4_dev *dev, u8 vep_num, u8 port, u8 steer,
  61                               struct mlx4_cmd_mailbox *mailbox)
  62 {
  63         u32 in_mod;
  64
  65         in_mod = (u32) vep_num << 24 | (u32) port << 16 | steer << 1;
  66         return mlx4_cmd(dev, mailbox->dma, in_mod, 0x1,
  67                         MLX4_CMD_WRITE_MCG, MLX4_CMD_TIME_CLASS_A);
  68 }
  69
  70 static int mlx4_GID_HASH(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
  71                          u16 *hash, u8 op_mod)
  72 {
  73         u64 imm;
  74         int err;
  75
  76         err = mlx4_cmd_imm(dev, mailbox->dma, &imm, 0, op_mod,
  77                            MLX4_CMD_MGID_HASH, MLX4_CMD_TIME_CLASS_A);
  78
  79         if (!err)
  80                 *hash = imm;
  81
  82         return err;
  83 }
  84
  85 static struct mlx4_promisc_qp *get_promisc_qp(struct mlx4_dev *dev, u8 pf_num,
  86                                               enum mlx4_steer_type steer,
  87                                               u32 qpn)
  88 {
  89         struct mlx4_steer *s_steer = &mlx4_priv(dev)->steer[pf_num];
  90         struct mlx4_promisc_qp *pqp;
  91
  92         list_for_each_entry(pqp, &s_steer->promisc_qps[steer], list) {
  93                 if (pqp->qpn == qpn)
  94                         return pqp;
  95         }
  96         /* not found */
  97         return NULL;
  98 }
  99
 100 /*
 101  * Add new entry to steering data structure.
 102  * All promisc QPs should be added as well
 103  */
 104 static int new_steering_entry(struct mlx4_dev *dev, u8 vep_num, u8 port,
 105                               enum mlx4_steer_type steer,
 106                               unsigned int index, u32 qpn)
 107 {
 108         struct mlx4_steer *s_steer;
 109         struct mlx4_cmd_mailbox *mailbox;
 110         struct mlx4_mgm *mgm;
 111         u32 members_count;
 112         struct mlx4_steer_index *new_entry;
 113         struct mlx4_promisc_qp *pqp;
 114         struct mlx4_promisc_qp *dqp = NULL;
 115         u32 prot;
 116         int err;
 117         u8 pf_num;
 118
 119         pf_num = (dev->caps.num_ports == 1) ? vep_num : (vep_num << 1) | (port - 1);
 120         s_steer = &mlx4_priv(dev)->steer[pf_num];
 121         new_entry = kzalloc(sizeof *new_entry, GFP_KERNEL);
 122         if (!new_entry)
 123                 return -ENOMEM;
 124
 125         INIT_LIST_HEAD(&new_entry->duplicates);
 126         new_entry->index = index;
 127         list_add_tail(&new_entry->list, &s_steer->steer_entries[steer]);
 128
 129         /* If the given qpn is also a promisc qp,
 130          * it should be inserted to duplicates list
 131          */
 132         pqp = get_promisc_qp(dev, pf_num, steer, qpn);
 133         if (pqp) {
 134                 dqp = kmalloc(sizeof *dqp, GFP_KERNEL);
 135                 if (!dqp) {
 136                         err = -ENOMEM;
 137                         goto out_alloc;
 138                 }
 139                 dqp->qpn = qpn;
 140                 list_add_tail(&dqp->list, &new_entry->duplicates);
 141         }
 142
 143         /* if no promisc qps for this vep, we are done */
 144         if (list_empty(&s_steer->promisc_qps[steer]))
 145                 return 0;
 146
 147         /* now need to add all the promisc qps to the new
 148          * steering entry, as they should also receive the packets
 149          * destined to this address */
 150         mailbox = mlx4_alloc_cmd_mailbox(dev);
 151         if (IS_ERR(mailbox)) {
 152                 err = -ENOMEM;
 153                 goto out_alloc;
 154         }
 155         mgm = mailbox->buf;
 156
 157         err = mlx4_READ_ENTRY(dev, index, mailbox);
 158         if (err)
 159                 goto out_mailbox;
 160
 161         members_count = be32_to_cpu(mgm->members_count) & 0xffffff;
 162         prot = be32_to_cpu(mgm->members_count) >> 30;
 163         list_for_each_entry(pqp, &s_steer->promisc_qps[steer], list) {
 164                 /* don't add already existing qpn */
 165                 if (pqp->qpn == qpn)
 166                         continue;
 167                 if (members_count == MLX4_QP_PER_MGM) {
 168                         /* out of space */
 169                         err = -ENOMEM;
 170                         goto out_mailbox;
 171                 }
 172
 173                 /* add the qpn */
 174                 mgm->qp[members_count++] = cpu_to_be32(pqp->qpn & MGM_QPN_MASK);
 175         }
 176         /* update the qps count and update the entry with all the promisc qps*/
 177         mgm->members_count = cpu_to_be32(members_count | (prot << 30));
 178         err = mlx4_WRITE_ENTRY(dev, index, mailbox);
 179
 180 out_mailbox:
 181         mlx4_free_cmd_mailbox(dev, mailbox);
 182         if (!err)
 183                 return 0;
 184 out_alloc:
 185         if (dqp) {
 186                 list_del(&dqp->list);
 187                 kfree(dqp);
 188         }
 189         list_del(&new_entry->list);
 190         kfree(new_entry);
 191         return err;
 192 }
 193
 194 /* update the data structures with existing steering entry */
 195 static int existing_steering_entry(struct mlx4_dev *dev, u8 vep_num, u8 port,
 196                                    enum mlx4_steer_type steer,
 197                                    unsigned int index, u32 qpn)
 198 {
 199         struct mlx4_steer *s_steer;
 200         struct mlx4_steer_index *tmp_entry, *entry = NULL;
 201         struct mlx4_promisc_qp *pqp;
 202         struct mlx4_promisc_qp *dqp;
 203         u8 pf_num;
 204
 205         pf_num = (dev->caps.num_ports == 1) ? vep_num : (vep_num << 1) | (port - 1);
 206         s_steer = &mlx4_priv(dev)->steer[pf_num];
 207
 208         pqp = get_promisc_qp(dev, pf_num, steer, qpn);
 209         if (!pqp)
 210                 return 0; /* nothing to do */
 211
 212         list_for_each_entry(tmp_entry, &s_steer->steer_entries[steer], list) {
 213                 if (tmp_entry->index == index) {
 214                         entry = tmp_entry;
 215                         break;
 216                 }
 217         }
 218         if (unlikely(!entry)) {
 219                 mlx4_warn(dev, "Steering entry at index %x is not registered\n", index);
 220                 return -EINVAL;
 221         }
 222
 223         /* the given qpn is listed as a promisc qpn
 224          * we need to add it as a duplicate to this entry
 225          * for future references */
 226         list_for_each_entry(dqp, &entry->duplicates, list) {
 227                 if (qpn == dqp->qpn)
 228                         return 0; /* qp is already duplicated */
 229         }
 230
 231         /* add the qp as a duplicate on this index */
 232         dqp = kmalloc(sizeof *dqp, GFP_KERNEL);
 233         if (!dqp)
 234                 return -ENOMEM;
 235         dqp->qpn = qpn;
 236         list_add_tail(&dqp->list, &entry->duplicates);
 237
 238         return 0;
 239 }
 240
 241 /* Check whether a qpn is a duplicate on steering entry
 242  * If so, it should not be removed from mgm */
 243 static bool check_duplicate_entry(struct mlx4_dev *dev, u8 vep_num, u8 port,
 244                                   enum mlx4_steer_type steer,
 245                                   unsigned int index, u32 qpn)
 246 {
 247         struct mlx4_steer *s_steer;
 248         struct mlx4_steer_index *tmp_entry, *entry = NULL;
 249         struct mlx4_promisc_qp *dqp, *tmp_dqp;
 250         u8 pf_num;
 251
 252         pf_num = (dev->caps.num_ports == 1) ? vep_num : (vep_num << 1) | (port - 1);
 253         s_steer = &mlx4_priv(dev)->steer[pf_num];
 254
 255         /* if qp is not promisc, it cannot be duplicated */
 256         if (!get_promisc_qp(dev, pf_num, steer, qpn))
 257                 return false;
 258
 259         /* The qp is promisc qp so it is a duplicate on this index
 260          * Find the index entry, and remove the duplicate */
 261         list_for_each_entry(tmp_entry, &s_steer->steer_entries[steer], list) {
 262                 if (tmp_entry->index == index) {
 263                         entry = tmp_entry;
 264                         break;
 265                 }
 266         }
 267         if (unlikely(!entry)) {
 268                 mlx4_warn(dev, "Steering entry for index %x is not registered\n", index);
 269                 return false;
 270         }
 271         list_for_each_entry_safe(dqp, tmp_dqp, &entry->duplicates, list) {
 272                 if (dqp->qpn == qpn) {
 273                         list_del(&dqp->list);
 274                         kfree(dqp);
 275                 }
 276         }
 277         return true;
 278 }
 279
 280 /* I a steering entry contains only promisc QPs, it can be removed. */
 281 static bool can_remove_steering_entry(struct mlx4_dev *dev, u8 vep_num, u8 port,
 282                                       enum mlx4_steer_type steer,
 283                                       unsigned int index, u32 tqpn)
 284 {
 285         struct mlx4_steer *s_steer;
 286         struct mlx4_cmd_mailbox *mailbox;
 287         struct mlx4_mgm *mgm;
 288         struct mlx4_steer_index *entry = NULL, *tmp_entry;
 289         u32 qpn;
 290         u32 members_count;
 291         bool ret = false;
 292         int i;
 293         u8 pf_num;
 294
 295         pf_num = (dev->caps.num_ports == 1) ? vep_num : (vep_num << 1) | (port - 1);
 296         s_steer = &mlx4_priv(dev)->steer[pf_num];
 297
 298         mailbox = mlx4_alloc_cmd_mailbox(dev);
 299         if (IS_ERR(mailbox))
 300                 return false;
 301         mgm = mailbox->buf;
 302
 303         if (mlx4_READ_ENTRY(dev, index, mailbox))
 304                 goto out;
 305         members_count = be32_to_cpu(mgm->members_count) & 0xffffff;
 306         for (i = 0;  i < members_count; i++) {
 307                 qpn = be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK;
 308                 if (!get_promisc_qp(dev, pf_num, steer, qpn) && qpn != tqpn) {
 309                         /* the qp is not promisc, the entry can't be removed */
 310                         goto out;
 311                 }
 312         }
 313          /* All the qps currently registered for this entry are promiscuous,
 314           * Checking for duplicates */
 315         ret = true;
 316         list_for_each_entry_safe(entry, tmp_entry, &s_steer->steer_entries[steer], list) {
 317                 if (entry->index == index) {
 318                         if (list_empty(&entry->duplicates)) {
 319                                 list_del(&entry->list);
 320                                 kfree(entry);
 321                         } else {
 322                                 /* This entry contains duplicates so it shouldn't be removed */
 323                                 ret = false;
 324                                 goto out;
 325                         }
 326                 }
 327         }
 328
 329 out:
 330         mlx4_free_cmd_mailbox(dev, mailbox);
 331         return ret;
 332 }
 333
 334 static int add_promisc_qp(struct mlx4_dev *dev, u8 vep_num, u8 port,
 335                           enum mlx4_steer_type steer, u32 qpn)
 336 {
 337         struct mlx4_steer *s_steer;
 338         struct mlx4_cmd_mailbox *mailbox;
 339         struct mlx4_mgm *mgm;
 340         struct mlx4_steer_index *entry;
 341         struct mlx4_promisc_qp *pqp;
 342         struct mlx4_promisc_qp *dqp;
 343         u32 members_count;
 344         u32 prot;
 345         int i;
 346         bool found;
 347         int last_index;
 348         int err;
 349         u8 pf_num;
 350         struct mlx4_priv *priv = mlx4_priv(dev);
 351         pf_num = (dev->caps.num_ports == 1) ? vep_num : (vep_num << 1) | (port - 1);
 352         s_steer = &mlx4_priv(dev)->steer[pf_num];
 353
 354         mutex_lock(&priv->mcg_table.mutex);
 355
 356         if (get_promisc_qp(dev, pf_num, steer, qpn)) {
 357                 err = 0;  /* Noting to do, already exists */
 358                 goto out_mutex;
 359         }
 360
 361         pqp = kmalloc(sizeof *pqp, GFP_KERNEL);
 362         if (!pqp) {
 363                 err = -ENOMEM;
 364                 goto out_mutex;
 365         }
 366         pqp->qpn = qpn;
 367
 368         mailbox = mlx4_alloc_cmd_mailbox(dev);
 369         if (IS_ERR(mailbox)) {
 370                 err = -ENOMEM;
 371                 goto out_alloc;
 372         }
 373         mgm = mailbox->buf;
 374
 375         /* the promisc qp needs to be added for each one of the steering
 376          * entries, if it already exists, needs to be added as a duplicate
 377          * for this entry */
 378         list_for_each_entry(entry, &s_steer->steer_entries[steer], list) {
 379                 err = mlx4_READ_ENTRY(dev, entry->index, mailbox);
 380                 if (err)
 381                         goto out_mailbox;
 382
 383                 members_count = be32_to_cpu(mgm->members_count) & 0xffffff;
 384                 prot = be32_to_cpu(mgm->members_count) >> 30;
 385                 found = false;
 386                 for (i = 0; i < members_count; i++) {
 387                         if ((be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK) == qpn) {
 388                                 /* Entry already exists, add to duplicates */
 389                                 dqp = kmalloc(sizeof *dqp, GFP_KERNEL);
 390                                 if (!dqp)
 391                                         goto out_mailbox;
 392                                 dqp->qpn = qpn;
 393                                 list_add_tail(&dqp->list, &entry->duplicates);
 394                                 found = true;
 395                         }
 396                 }
 397                 if (!found) {
 398                         /* Need to add the qpn to mgm */
 399                         if (members_count == MLX4_QP_PER_MGM) {
 400                                 /* entry is full */
 401                                 err = -ENOMEM;
 402                                 goto out_mailbox;
 403                         }
 404                         mgm->qp[members_count++] = cpu_to_be32(qpn & MGM_QPN_MASK);
 405                         mgm->members_count = cpu_to_be32(members_count | (prot << 30));
 406                         err = mlx4_WRITE_ENTRY(dev, entry->index, mailbox);
 407                         if (err)
 408                                 goto out_mailbox;
 409                 }
 410                 last_index = entry->index;
 411         }
 412
 413         /* add the new qpn to list of promisc qps */
 414         list_add_tail(&pqp->list, &s_steer->promisc_qps[steer]);
 415         /* now need to add all the promisc qps to default entry */
 416         memset(mgm, 0, sizeof *mgm);
 417         members_count = 0;
 418         list_for_each_entry(dqp, &s_steer->promisc_qps[steer], list)
 419                 mgm->qp[members_count++] = cpu_to_be32(dqp->qpn & MGM_QPN_MASK);
 420         mgm->members_count = cpu_to_be32(members_count | MLX4_PROT_ETH << 30);
 421
 422         err = mlx4_WRITE_PROMISC(dev, vep_num, port, steer, mailbox);
 423         if (err)
 424                 goto out_list;
 425
 426         mlx4_free_cmd_mailbox(dev, mailbox);
 427         mutex_unlock(&priv->mcg_table.mutex);
 428         return 0;
 429
 430 out_list:
 431         list_del(&pqp->list);
 432 out_mailbox:
 433         mlx4_free_cmd_mailbox(dev, mailbox);
 434 out_alloc:
 435         kfree(pqp);
 436 out_mutex:
 437         mutex_unlock(&priv->mcg_table.mutex);
 438         return err;
 439 }
 440
 441 static int remove_promisc_qp(struct mlx4_dev *dev, u8 vep_num, u8 port,
 442                              enum mlx4_steer_type steer, u32 qpn)
 443 {
 444         struct mlx4_priv *priv = mlx4_priv(dev);
 445         struct mlx4_steer *s_steer;
 446         struct mlx4_cmd_mailbox *mailbox;
 447         struct mlx4_mgm *mgm;
 448         struct mlx4_steer_index *entry;
 449         struct mlx4_promisc_qp *pqp;
 450         struct mlx4_promisc_qp *dqp;
 451         u32 members_count;
 452         bool found;
 453         bool back_to_list = false;
 454         int loc, i;
 455         int err;
 456         u8 pf_num;
 457
 458         pf_num = (dev->caps.num_ports == 1) ? vep_num : (vep_num << 1) | (port - 1);
 459         s_steer = &mlx4_priv(dev)->steer[pf_num];
 460         mutex_lock(&priv->mcg_table.mutex);
 461
 462         pqp = get_promisc_qp(dev, pf_num, steer, qpn);
 463         if (unlikely(!pqp)) {
 464                 mlx4_warn(dev, "QP %x is not promiscuous QP\n", qpn);
 465                 /* nothing to do */
 466                 err = 0;
 467                 goto out_mutex;
 468         }
 469
 470         /*remove from list of promisc qps */
 471         list_del(&pqp->list);
 472
 473         /* set the default entry not to include the removed one */
 474         mailbox = mlx4_alloc_cmd_mailbox(dev);
 475         if (IS_ERR(mailbox)) {
 476                 err = -ENOMEM;
 477                 back_to_list = true;
 478                 goto out_list;
 479         }
 480         mgm = mailbox->buf;
 481         members_count = 0;
 482         list_for_each_entry(dqp, &s_steer->promisc_qps[steer], list)
 483                 mgm->qp[members_count++] = cpu_to_be32(dqp->qpn & MGM_QPN_MASK);
 484         mgm->members_count = cpu_to_be32(members_count | MLX4_PROT_ETH << 30);
 485
 486         err = mlx4_WRITE_PROMISC(dev, vep_num, port, steer, mailbox);
 487         if (err)
 488                 goto out_mailbox;
 489
 490         /* remove the qp from all the steering entries*/
 491         list_for_each_entry(entry, &s_steer->steer_entries[steer], list) {
 492                 found = false;
 493                 list_for_each_entry(dqp, &entry->duplicates, list) {
 494                         if (dqp->qpn == qpn) {
 495                                 found = true;
 496                                 break;
 497                         }
 498                 }
 499                 if (found) {
 500                         /* a duplicate, no need to change the mgm,
 501                          * only update the duplicates list */
 502                         list_del(&dqp->list);
 503                         kfree(dqp);
 504                 } else {
 505                         err = mlx4_READ_ENTRY(dev, entry->index, mailbox);
 506                                 if (err)
 507                                         goto out_mailbox;
 508                         members_count = be32_to_cpu(mgm->members_count) & 0xffffff;
 509                         for (loc = -1, i = 0; i < members_count; ++i)
 510                                 if ((be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK) == qpn)
 511                                         loc = i;
 512
 513                         mgm->members_count = cpu_to_be32(--members_count |
 514                                                          (MLX4_PROT_ETH << 30));
 515                         mgm->qp[loc] = mgm->qp[i - 1];
 516                         mgm->qp[i - 1] = 0;
 517
 518                         err = mlx4_WRITE_ENTRY(dev, entry->index, mailbox);
 519                                 if (err)
 520                                         goto out_mailbox;
 521                 }
 522
 523         }
 524
 525 out_mailbox:
 526         mlx4_free_cmd_mailbox(dev, mailbox);
 527 out_list:
 528         if (back_to_list)
 529                 list_add_tail(&pqp->list, &s_steer->promisc_qps[steer]);
 530         else
 531                 kfree(pqp);
 532 out_mutex:
 533         mutex_unlock(&priv->mcg_table.mutex);
 534         return err;
 535 }
 536
 537 /*
 538  * Caller must hold MCG table semaphore.  gid and mgm parameters must
 539  * be properly aligned for command interface.
 540  *
 541  *  Returns 0 unless a firmware command error occurs.
 542  *
 543  * If GID is found in MGM or MGM is empty, *index = *hash, *prev = -1
 544  * and *mgm holds MGM entry.
 545  *
 546  * if GID is found in AMGM, *index = index in AMGM, *prev = index of
 547  * previous entry in hash chain and *mgm holds AMGM entry.
 548  *
 549  * If no AMGM exists for given gid, *index = -1, *prev = index of last
 550  * entry in hash chain and *mgm holds end of hash chain.
 551  */
 552 static int find_entry(struct mlx4_dev *dev, u8 port,
 553                       u8 *gid, enum mlx4_protocol prot,
 554                       enum mlx4_steer_type steer,
 555                       struct mlx4_cmd_mailbox *mgm_mailbox,
 556                       u16 *hash, int *prev, int *index)
 557 {
 558         struct mlx4_cmd_mailbox *mailbox;
 559         struct mlx4_mgm *mgm = mgm_mailbox->buf;
 560         u8 *mgid;
 561         int err;
 562         u8 op_mod = (prot == MLX4_PROT_ETH) ?
 563                 !!(dev->caps.flags & MLX4_DEV_CAP_FLAG_VEP_MC_STEER) : 0;
 564
 565         mailbox = mlx4_alloc_cmd_mailbox(dev);
 566         if (IS_ERR(mailbox))
 567                 return -ENOMEM;
 568         mgid = mailbox->buf;
 569
 570         memcpy(mgid, gid, 16);
 571
 572         err = mlx4_GID_HASH(dev, mailbox, hash, op_mod);
 573         mlx4_free_cmd_mailbox(dev, mailbox);
 574         if (err)
 575                 return err;
 576
 577         if (0)
 578                 mlx4_dbg(dev, "Hash for %pI6 is %04x\n", gid, *hash);
 579
 580         *index = *hash;
 581         *prev  = -1;
 582
 583         do {
 584                 err = mlx4_READ_ENTRY(dev, *index, mgm_mailbox);
 585                 if (err)
 586                         return err;
 587
 588                 if (!(be32_to_cpu(mgm->members_count) & 0xffffff)) {
 589                         if (*index != *hash) {
 590                                 mlx4_err(dev, "Found zero MGID in AMGM.\n");
 591                                 err = -EINVAL;
 592                         }
 593                         return err;
 594                 }
 595
 596                 if (!memcmp(mgm->gid, gid, 16) &&
 597                     be32_to_cpu(mgm->members_count) >> 30 == prot)
 598                         return err;
 599
 600                 *prev = *index;
 601                 *index = be32_to_cpu(mgm->next_gid_index) >> 6;
 602         } while (*index);
 603
 604         *index = -1;
 605         return err;
 606 }
 607
 608 int mlx4_qp_attach_common(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16],
 609                           int block_mcast_loopback, enum mlx4_protocol prot,
 610                           enum mlx4_steer_type steer)
 611 {
 612         struct mlx4_priv *priv = mlx4_priv(dev);
 613         struct mlx4_cmd_mailbox *mailbox;
 614         struct mlx4_mgm *mgm;
 615         u32 members_count;
 616         u16 hash;
 617         int index, prev;
 618         int link = 0;
 619         int i;
 620         int err;
 621         u8 port = gid[5];
 622         u8 new_entry = 0;
 623
 624         mailbox = mlx4_alloc_cmd_mailbox(dev);
 625         if (IS_ERR(mailbox))
 626                 return PTR_ERR(mailbox);
 627         mgm = mailbox->buf;
 628
 629         mutex_lock(&priv->mcg_table.mutex);
 630         err = find_entry(dev, port, gid, prot, steer,
 631                          mailbox, &hash, &prev, &index);
 632         if (err)
 633                 goto out;
 634
 635         if (index != -1) {
 636                 if (!(be32_to_cpu(mgm->members_count) & 0xffffff)) {
 637                         new_entry = 1;
 638                         memcpy(mgm->gid, gid, 16);
 639                 }
 640         } else {
 641                 link = 1;
 642
 643                 index = mlx4_bitmap_alloc(&priv->mcg_table.bitmap);
 644                 if (index == -1) {
 645                         mlx4_err(dev, "No AMGM entries left\n");
 646                         err = -ENOMEM;
 647                         goto out;
 648                 }
 649                 index += dev->caps.num_mgms;
 650
 651                 memset(mgm, 0, sizeof *mgm);
 652                 memcpy(mgm->gid, gid, 16);
 653         }
 654
 655         members_count = be32_to_cpu(mgm->members_count) & 0xffffff;
 656         if (members_count == MLX4_QP_PER_MGM) {
 657                 mlx4_err(dev, "MGM at index %x is full.\n", index);
 658                 err = -ENOMEM;
 659                 goto out;
 660         }
 661
 662         for (i = 0; i < members_count; ++i)
 663                 if ((be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK) == qp->qpn) {
 664                         mlx4_dbg(dev, "QP %06x already a member of MGM\n", qp->qpn);
 665                         err = 0;
 666                         goto out;
 667                 }
 668
 669         if (block_mcast_loopback)
 670                 mgm->qp[members_count++] = cpu_to_be32((qp->qpn & MGM_QPN_MASK) |
 671                                                        (1U << MGM_BLCK_LB_BIT));
 672         else
 673                 mgm->qp[members_count++] = cpu_to_be32(qp->qpn & MGM_QPN_MASK);
 674
 675         mgm->members_count = cpu_to_be32(members_count | (u32) prot << 30);
 676
 677         err = mlx4_WRITE_ENTRY(dev, index, mailbox);
 678         if (err)
 679                 goto out;
 680
 681         if (!link)
 682                 goto out;
 683
 684         err = mlx4_READ_ENTRY(dev, prev, mailbox);
 685         if (err)
 686                 goto out;
 687
 688         mgm->next_gid_index = cpu_to_be32(index << 6);
 689
 690         err = mlx4_WRITE_ENTRY(dev, prev, mailbox);
 691         if (err)
 692                 goto out;
 693
 694 out:
 695         if (prot == MLX4_PROT_ETH) {
 696                 /* manage the steering entry for promisc mode */
 697                 if (new_entry)
 698                         new_steering_entry(dev, 0, port, steer, index, qp->qpn);
 699                 else
 700                         existing_steering_entry(dev, 0, port, steer,
 701                                                 index, qp->qpn);
 702         }
 703         if (err && link && index != -1) {
 704                 if (index < dev->caps.num_mgms)
 705                         mlx4_warn(dev, "Got AMGM index %d < %d",
 706                                   index, dev->caps.num_mgms);
 707                 else
 708                         mlx4_bitmap_free(&priv->mcg_table.bitmap,
 709                                          index - dev->caps.num_mgms);
 710         }
 711         mutex_unlock(&priv->mcg_table.mutex);
 712
 713         mlx4_free_cmd_mailbox(dev, mailbox);
 714         return err;
 715 }
 716
 717 int mlx4_qp_detach_common(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16],
 718                           enum mlx4_protocol prot, enum mlx4_steer_type steer)
 719 {
 720         struct mlx4_priv *priv = mlx4_priv(dev);
 721         struct mlx4_cmd_mailbox *mailbox;
 722         struct mlx4_mgm *mgm;
 723         u32 members_count;
 724         u16 hash;
 725         int prev, index;
 726         int i, loc;
 727         int err;
 728         u8 port = gid[5];
 729         bool removed_entry = false;
 730
 731         mailbox = mlx4_alloc_cmd_mailbox(dev);
 732         if (IS_ERR(mailbox))
 733                 return PTR_ERR(mailbox);
 734         mgm = mailbox->buf;
 735
 736         mutex_lock(&priv->mcg_table.mutex);
 737
 738         err = find_entry(dev, port, gid, prot, steer,
 739                          mailbox, &hash, &prev, &index);
 740         if (err)
 741                 goto out;
 742
 743         if (index == -1) {
 744                 mlx4_err(dev, "MGID %pI6 not found\n", gid);
 745                 err = -EINVAL;
 746                 goto out;
 747         }
 748
 749         /* if this pq is also a promisc qp, it shouldn't be removed */
 750         if (prot == MLX4_PROT_ETH &&
 751             check_duplicate_entry(dev, 0, port, steer, index, qp->qpn))
 752                 goto out;
 753
 754         members_count = be32_to_cpu(mgm->members_count) & 0xffffff;
 755         for (loc = -1, i = 0; i < members_count; ++i)
 756                 if ((be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK) == qp->qpn)
 757                         loc = i;
 758
 759         if (loc == -1) {
 760                 mlx4_err(dev, "QP %06x not found in MGM\n", qp->qpn);
 761                 err = -EINVAL;
 762                 goto out;
 763         }
 764
 765
 766         mgm->members_count = cpu_to_be32(--members_count | (u32) prot << 30);
 767         mgm->qp[loc]       = mgm->qp[i - 1];
 768         mgm->qp[i - 1]     = 0;
 769
 770         if (prot == MLX4_PROT_ETH)
 771                 removed_entry = can_remove_steering_entry(dev, 0, port, steer, index, qp->qpn);
 772         if (i != 1 && (prot != MLX4_PROT_ETH || !removed_entry)) {
 773                 err = mlx4_WRITE_ENTRY(dev, index, mailbox);
 774                 goto out;
 775         }
 776
 777         /* We are going to delete the entry, members count should be 0 */
 778         mgm->members_count = cpu_to_be32((u32) prot << 30);
 779
 780         if (prev == -1) {
 781                 /* Remove entry from MGM */
 782                 int amgm_index = be32_to_cpu(mgm->next_gid_index) >> 6;
 783                 if (amgm_index) {
 784                         err = mlx4_READ_ENTRY(dev, amgm_index, mailbox);
 785                         if (err)
 786                                 goto out;
 787                 } else
 788                         memset(mgm->gid, 0, 16);
 789
 790                 err = mlx4_WRITE_ENTRY(dev, index, mailbox);
 791                 if (err)
 792                         goto out;
 793
 794                 if (amgm_index) {
 795                         if (amgm_index < dev->caps.num_mgms)
 796                                 mlx4_warn(dev, "MGM entry %d had AMGM index %d < %d",
 797                                           index, amgm_index, dev->caps.num_mgms);
 798                         else
 799                                 mlx4_bitmap_free(&priv->mcg_table.bitmap,
 800                                                  amgm_index - dev->caps.num_mgms);
 801                 }
 802         } else {
 803                 /* Remove entry from AMGM */
 804                 int cur_next_index = be32_to_cpu(mgm->next_gid_index) >> 6;
 805                 err = mlx4_READ_ENTRY(dev, prev, mailbox);
 806                 if (err)
 807                         goto out;
 808
 809                 mgm->next_gid_index = cpu_to_be32(cur_next_index << 6);
 810
 811                 err = mlx4_WRITE_ENTRY(dev, prev, mailbox);
 812                 if (err)
 813                         goto out;
 814
 815                 if (index < dev->caps.num_mgms)
 816                         mlx4_warn(dev, "entry %d had next AMGM index %d < %d",
 817                                   prev, index, dev->caps.num_mgms);
 818                 else
 819                         mlx4_bitmap_free(&priv->mcg_table.bitmap,
 820                                          index - dev->caps.num_mgms);
 821         }
 822
 823 out:
 824         mutex_unlock(&priv->mcg_table.mutex);
 825
 826         mlx4_free_cmd_mailbox(dev, mailbox);
 827         return err;
 828 }
 829
 830
 831 int mlx4_multicast_attach(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16],
 832                           int block_mcast_loopback, enum mlx4_protocol prot)
 833 {
 834         enum mlx4_steer_type steer;
 835
 836         steer = (is_valid_ether_addr(&gid[10])) ? MLX4_UC_STEER : MLX4_MC_STEER;
 837
 838         if (prot == MLX4_PROT_ETH &&
 839                         !(dev->caps.flags & MLX4_DEV_CAP_FLAG_VEP_MC_STEER))
 840                 return 0;
 841
 842         if (prot == MLX4_PROT_ETH)
 843                 gid[7] |= (steer << 1);
 844
 845         return mlx4_qp_attach_common(dev, qp, gid,
 846                                      block_mcast_loopback, prot,
 847                                      steer);
 848 }
 849 EXPORT_SYMBOL_GPL(mlx4_multicast_attach);
 850
 851 int mlx4_multicast_detach(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16],
 852                           enum mlx4_protocol prot)
 853 {
 854         enum mlx4_steer_type steer;
 855
 856         steer = (is_valid_ether_addr(&gid[10])) ? MLX4_UC_STEER : MLX4_MC_STEER;
 857
 858         if (prot == MLX4_PROT_ETH &&
 859                         !(dev->caps.flags & MLX4_DEV_CAP_FLAG_VEP_MC_STEER))
 860                 return 0;
 861
 862         if (prot == MLX4_PROT_ETH) {
 863                 gid[7] |= (steer << 1);
 864         }
 865
 866         return mlx4_qp_detach_common(dev, qp, gid, prot, steer);
 867 }
 868 EXPORT_SYMBOL_GPL(mlx4_multicast_detach);
 869
 870
 871 int mlx4_multicast_promisc_add(struct mlx4_dev *dev, u32 qpn, u8 port)
 872 {
 873         if (!(dev->caps.flags & MLX4_DEV_CAP_FLAG_VEP_MC_STEER))
 874                 return 0;
 875
 876
 877         return add_promisc_qp(dev, 0, port, MLX4_MC_STEER, qpn);
 878 }
 879 EXPORT_SYMBOL_GPL(mlx4_multicast_promisc_add);
 880
 881 int mlx4_multicast_promisc_remove(struct mlx4_dev *dev, u32 qpn, u8 port)
 882 {
 883         if (!(dev->caps.flags & MLX4_DEV_CAP_FLAG_VEP_MC_STEER))
 884                 return 0;
 885
 886
 887         return remove_promisc_qp(dev, 0, port, MLX4_MC_STEER, qpn);
 888 }
 889 EXPORT_SYMBOL_GPL(mlx4_multicast_promisc_remove);
 890
 891 int mlx4_unicast_promisc_add(struct mlx4_dev *dev, u32 qpn, u8 port)
 892 {
 893         if (!(dev->caps.flags & MLX4_DEV_CAP_FLAG_VEP_MC_STEER))
 894                 return 0;
 895
 896
 897         return add_promisc_qp(dev, 0, port, MLX4_UC_STEER, qpn);
 898 }
 899 EXPORT_SYMBOL_GPL(mlx4_unicast_promisc_add);
 900
 901 int mlx4_unicast_promisc_remove(struct mlx4_dev *dev, u32 qpn, u8 port)
 902 {
 903         if (!(dev->caps.flags & MLX4_DEV_CAP_FLAG_VEP_MC_STEER))
 904                 return 0;
 905
 906         return remove_promisc_qp(dev, 0, port, MLX4_UC_STEER, qpn);
 907 }
 908 EXPORT_SYMBOL_GPL(mlx4_unicast_promisc_remove);
 909
 910 int mlx4_init_mcg_table(struct mlx4_dev *dev)
 911 {
 912         struct mlx4_priv *priv = mlx4_priv(dev);
 913         int err;
 914
 915         err = mlx4_bitmap_init(&priv->mcg_table.bitmap, dev->caps.num_amgms,
 916                                dev->caps.num_amgms - 1, 0, 0);
 917         if (err)
 918                 return err;
 919
 920         mutex_init(&priv->mcg_table.mutex);
 921
 922         return 0;
 923 }
 924
 925 void mlx4_cleanup_mcg_table(struct mlx4_dev *dev)
 926 {
 927         mlx4_bitmap_cleanup(&mlx4_priv(dev)->mcg_table.bitmap);
 928 }