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 err;
 361         struct mlx4_priv *priv = mlx4_priv(dev);
 362
 363         s_steer = &mlx4_priv(dev)->steer[port - 1];
 364
 365         mutex_lock(&priv->mcg_table.mutex);
 366
 367         if (get_promisc_qp(dev, 0, steer, qpn)) {
 368                 err = 0;  /* Noting to do, already exists */
 369                 goto out_mutex;
 370         }
 371
 372         pqp = kmalloc(sizeof *pqp, GFP_KERNEL);
 373         if (!pqp) {
 374                 err = -ENOMEM;
 375                 goto out_mutex;
 376         }
 377         pqp->qpn = qpn;
 378
 379         mailbox = mlx4_alloc_cmd_mailbox(dev);
 380         if (IS_ERR(mailbox)) {
 381                 err = -ENOMEM;
 382                 goto out_alloc;
 383         }
 384         mgm = mailbox->buf;
 385
 386         /* the promisc qp needs to be added for each one of the steering
 387          * entries, if it already exists, needs to be added as a duplicate
 388          * for this entry */
 389         list_for_each_entry(entry, &s_steer->steer_entries[steer], list) {
 390                 err = mlx4_READ_ENTRY(dev, entry->index, mailbox);
 391                 if (err)
 392                         goto out_mailbox;
 393
 394                 members_count = be32_to_cpu(mgm->members_count) & 0xffffff;
 395                 prot = be32_to_cpu(mgm->members_count) >> 30;
 396                 found = false;
 397                 for (i = 0; i < members_count; i++) {
 398                         if ((be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK) == qpn) {
 399                                 /* Entry already exists, add to duplicates */
 400                                 dqp = kmalloc(sizeof *dqp, GFP_KERNEL);
 401                                 if (!dqp)
 402                                         goto out_mailbox;
 403                                 dqp->qpn = qpn;
 404                                 list_add_tail(&dqp->list, &entry->duplicates);
 405                                 found = true;
 406                         }
 407                 }
 408                 if (!found) {
 409                         /* Need to add the qpn to mgm */
 410                         if (members_count == dev->caps.num_qp_per_mgm) {
 411                                 /* entry is full */
 412                                 err = -ENOMEM;
 413                                 goto out_mailbox;
 414                         }
 415                         mgm->qp[members_count++] = cpu_to_be32(qpn & MGM_QPN_MASK);
 416                         mgm->members_count = cpu_to_be32(members_count | (prot << 30));
 417                         err = mlx4_WRITE_ENTRY(dev, entry->index, mailbox);
 418                         if (err)
 419                                 goto out_mailbox;
 420                 }
 421         }
 422
 423         /* add the new qpn to list of promisc qps */
 424         list_add_tail(&pqp->list, &s_steer->promisc_qps[steer]);
 425         /* now need to add all the promisc qps to default entry */
 426         memset(mgm, 0, sizeof *mgm);
 427         members_count = 0;
 428         list_for_each_entry(dqp, &s_steer->promisc_qps[steer], list)
 429                 mgm->qp[members_count++] = cpu_to_be32(dqp->qpn & MGM_QPN_MASK);
 430         mgm->members_count = cpu_to_be32(members_count | MLX4_PROT_ETH << 30);
 431
 432         err = mlx4_WRITE_PROMISC(dev, port, steer, mailbox);
 433         if (err)
 434                 goto out_list;
 435
 436         mlx4_free_cmd_mailbox(dev, mailbox);
 437         mutex_unlock(&priv->mcg_table.mutex);
 438         return 0;
 439
 440 out_list:
 441         list_del(&pqp->list);
 442 out_mailbox:
 443         mlx4_free_cmd_mailbox(dev, mailbox);
 444 out_alloc:
 445         kfree(pqp);
 446 out_mutex:
 447         mutex_unlock(&priv->mcg_table.mutex);
 448         return err;
 449 }
 450
 451 static int remove_promisc_qp(struct mlx4_dev *dev, u8 port,
 452                              enum mlx4_steer_type steer, u32 qpn)
 453 {
 454         struct mlx4_priv *priv = mlx4_priv(dev);
 455         struct mlx4_steer *s_steer;
 456         struct mlx4_cmd_mailbox *mailbox;
 457         struct mlx4_mgm *mgm;
 458         struct mlx4_steer_index *entry;
 459         struct mlx4_promisc_qp *pqp;
 460         struct mlx4_promisc_qp *dqp;
 461         u32 members_count;
 462         bool found;
 463         bool back_to_list = false;
 464         int loc, i;
 465         int err;
 466
 467         s_steer = &mlx4_priv(dev)->steer[port - 1];
 468         mutex_lock(&priv->mcg_table.mutex);
 469
 470         pqp = get_promisc_qp(dev, 0, steer, qpn);
 471         if (unlikely(!pqp)) {
 472                 mlx4_warn(dev, "QP %x is not promiscuous QP\n", qpn);
 473                 /* nothing to do */
 474                 err = 0;
 475                 goto out_mutex;
 476         }
 477
 478         /*remove from list of promisc qps */
 479         list_del(&pqp->list);
 480
 481         /* set the default entry not to include the removed one */
 482         mailbox = mlx4_alloc_cmd_mailbox(dev);
 483         if (IS_ERR(mailbox)) {
 484                 err = -ENOMEM;
 485                 back_to_list = true;
 486                 goto out_list;
 487         }
 488         mgm = mailbox->buf;
 489         memset(mgm, 0, sizeof *mgm);
 490         members_count = 0;
 491         list_for_each_entry(dqp, &s_steer->promisc_qps[steer], list)
 492                 mgm->qp[members_count++] = cpu_to_be32(dqp->qpn & MGM_QPN_MASK);
 493         mgm->members_count = cpu_to_be32(members_count | MLX4_PROT_ETH << 30);
 494
 495         err = mlx4_WRITE_PROMISC(dev, port, steer, mailbox);
 496         if (err)
 497                 goto out_mailbox;
 498
 499         /* remove the qp from all the steering entries*/
 500         list_for_each_entry(entry, &s_steer->steer_entries[steer], list) {
 501                 found = false;
 502                 list_for_each_entry(dqp, &entry->duplicates, list) {
 503                         if (dqp->qpn == qpn) {
 504                                 found = true;
 505                                 break;
 506                         }
 507                 }
 508                 if (found) {
 509                         /* a duplicate, no need to change the mgm,
 510                          * only update the duplicates list */
 511                         list_del(&dqp->list);
 512                         kfree(dqp);
 513                 } else {
 514                         err = mlx4_READ_ENTRY(dev, entry->index, mailbox);
 515                                 if (err)
 516                                         goto out_mailbox;
 517                         members_count = be32_to_cpu(mgm->members_count) & 0xffffff;
 518                         for (loc = -1, i = 0; i < members_count; ++i)
 519                                 if ((be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK) == qpn)
 520                                         loc = i;
 521
 522                         mgm->members_count = cpu_to_be32(--members_count |
 523                                                          (MLX4_PROT_ETH << 30));
 524                         mgm->qp[loc] = mgm->qp[i - 1];
 525                         mgm->qp[i - 1] = 0;
 526
 527                         err = mlx4_WRITE_ENTRY(dev, entry->index, mailbox);
 528                                 if (err)
 529                                         goto out_mailbox;
 530                 }
 531
 532         }
 533
 534 out_mailbox:
 535         mlx4_free_cmd_mailbox(dev, mailbox);
 536 out_list:
 537         if (back_to_list)
 538                 list_add_tail(&pqp->list, &s_steer->promisc_qps[steer]);
 539         else
 540                 kfree(pqp);
 541 out_mutex:
 542         mutex_unlock(&priv->mcg_table.mutex);
 543         return err;
 544 }
 545
 546 /*
 547  * Caller must hold MCG table semaphore.  gid and mgm parameters must
 548  * be properly aligned for command interface.
 549  *
 550  *  Returns 0 unless a firmware command error occurs.
 551  *
 552  * If GID is found in MGM or MGM is empty, *index = *hash, *prev = -1
 553  * and *mgm holds MGM entry.
 554  *
 555  * if GID is found in AMGM, *index = index in AMGM, *prev = index of
 556  * previous entry in hash chain and *mgm holds AMGM entry.
 557  *
 558  * If no AMGM exists for given gid, *index = -1, *prev = index of last
 559  * entry in hash chain and *mgm holds end of hash chain.
 560  */
 561 static int find_entry(struct mlx4_dev *dev, u8 port,
 562                       u8 *gid, enum mlx4_protocol prot,
 563                       struct mlx4_cmd_mailbox *mgm_mailbox,
 564                       int *prev, int *index)
 565 {
 566         struct mlx4_cmd_mailbox *mailbox;
 567         struct mlx4_mgm *mgm = mgm_mailbox->buf;
 568         u8 *mgid;
 569         int err;
 570         u16 hash;
 571         u8 op_mod = (prot == MLX4_PROT_ETH) ?
 572                 !!(dev->caps.flags & MLX4_DEV_CAP_FLAG_VEP_MC_STEER) : 0;
 573
 574         mailbox = mlx4_alloc_cmd_mailbox(dev);
 575         if (IS_ERR(mailbox))
 576                 return -ENOMEM;
 577         mgid = mailbox->buf;
 578
 579         memcpy(mgid, gid, 16);
 580
 581         err = mlx4_GID_HASH(dev, mailbox, &hash, op_mod);
 582         mlx4_free_cmd_mailbox(dev, mailbox);
 583         if (err)
 584                 return err;
 585
 586         if (0)
 587                 mlx4_dbg(dev, "Hash for %pI6 is %04x\n", gid, hash);
 588
 589         *index = hash;
 590         *prev  = -1;
 591
 592         do {
 593                 err = mlx4_READ_ENTRY(dev, *index, mgm_mailbox);
 594                 if (err)
 595                         return err;
 596
 597                 if (!(be32_to_cpu(mgm->members_count) & 0xffffff)) {
 598                         if (*index != hash) {
 599                                 mlx4_err(dev, "Found zero MGID in AMGM.\n");
 600                                 err = -EINVAL;
 601                         }
 602                         return err;
 603                 }
 604
 605                 if (!memcmp(mgm->gid, gid, 16) &&
 606                     be32_to_cpu(mgm->members_count) >> 30 == prot)
 607                         return err;
 608
 609                 *prev = *index;
 610                 *index = be32_to_cpu(mgm->next_gid_index) >> 6;
 611         } while (*index);
 612
 613         *index = -1;
 614         return err;
 615 }
 616
 617 int mlx4_qp_attach_common(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16],
 618                           int block_mcast_loopback, enum mlx4_protocol prot,
 619                           enum mlx4_steer_type steer)
 620 {
 621         struct mlx4_priv *priv = mlx4_priv(dev);
 622         struct mlx4_cmd_mailbox *mailbox;
 623         struct mlx4_mgm *mgm;
 624         u32 members_count;
 625         int index, prev;
 626         int link = 0;
 627         int i;
 628         int err;
 629         u8 port = gid[5];
 630         u8 new_entry = 0;
 631
 632         mailbox = mlx4_alloc_cmd_mailbox(dev);
 633         if (IS_ERR(mailbox))
 634                 return PTR_ERR(mailbox);
 635         mgm = mailbox->buf;
 636
 637         mutex_lock(&priv->mcg_table.mutex);
 638         err = find_entry(dev, port, gid, prot,
 639                          mailbox, &prev, &index);
 640         if (err)
 641                 goto out;
 642
 643         if (index != -1) {
 644                 if (!(be32_to_cpu(mgm->members_count) & 0xffffff)) {
 645                         new_entry = 1;
 646                         memcpy(mgm->gid, gid, 16);
 647                 }
 648         } else {
 649                 link = 1;
 650
 651                 index = mlx4_bitmap_alloc(&priv->mcg_table.bitmap);
 652                 if (index == -1) {
 653                         mlx4_err(dev, "No AMGM entries left\n");
 654                         err = -ENOMEM;
 655                         goto out;
 656                 }
 657                 index += dev->caps.num_mgms;
 658
 659                 new_entry = 1;
 660                 memset(mgm, 0, sizeof *mgm);
 661                 memcpy(mgm->gid, gid, 16);
 662         }
 663
 664         members_count = be32_to_cpu(mgm->members_count) & 0xffffff;
 665         if (members_count == dev->caps.num_qp_per_mgm) {
 666                 mlx4_err(dev, "MGM at index %x is full.\n", index);
 667                 err = -ENOMEM;
 668                 goto out;
 669         }
 670
 671         for (i = 0; i < members_count; ++i)
 672                 if ((be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK) == qp->qpn) {
 673                         mlx4_dbg(dev, "QP %06x already a member of MGM\n", qp->qpn);
 674                         err = 0;
 675                         goto out;
 676                 }
 677
 678         if (block_mcast_loopback)
 679                 mgm->qp[members_count++] = cpu_to_be32((qp->qpn & MGM_QPN_MASK) |
 680                                                        (1U << MGM_BLCK_LB_BIT));
 681         else
 682                 mgm->qp[members_count++] = cpu_to_be32(qp->qpn & MGM_QPN_MASK);
 683
 684         mgm->members_count = cpu_to_be32(members_count | (u32) prot << 30);
 685
 686         err = mlx4_WRITE_ENTRY(dev, index, mailbox);
 687         if (err)
 688                 goto out;
 689
 690         if (!link)
 691                 goto out;
 692
 693         err = mlx4_READ_ENTRY(dev, prev, mailbox);
 694         if (err)
 695                 goto out;
 696
 697         mgm->next_gid_index = cpu_to_be32(index << 6);
 698
 699         err = mlx4_WRITE_ENTRY(dev, prev, mailbox);
 700         if (err)
 701                 goto out;
 702
 703 out:
 704         if (prot == MLX4_PROT_ETH) {
 705                 /* manage the steering entry for promisc mode */
 706                 if (new_entry)
 707                         new_steering_entry(dev, port, steer, index, qp->qpn);
 708                 else
 709                         existing_steering_entry(dev, port, steer,
 710                                                 index, qp->qpn);
 711         }
 712         if (err && link && index != -1) {
 713                 if (index < dev->caps.num_mgms)
 714                         mlx4_warn(dev, "Got AMGM index %d < %d",
 715                                   index, dev->caps.num_mgms);
 716                 else
 717                         mlx4_bitmap_free(&priv->mcg_table.bitmap,
 718                                          index - dev->caps.num_mgms);
 719         }
 720         mutex_unlock(&priv->mcg_table.mutex);
 721
 722         mlx4_free_cmd_mailbox(dev, mailbox);
 723         return err;
 724 }
 725
 726 int mlx4_qp_detach_common(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16],
 727                           enum mlx4_protocol prot, enum mlx4_steer_type steer)
 728 {
 729         struct mlx4_priv *priv = mlx4_priv(dev);
 730         struct mlx4_cmd_mailbox *mailbox;
 731         struct mlx4_mgm *mgm;
 732         u32 members_count;
 733         int prev, index;
 734         int i, loc;
 735         int err;
 736         u8 port = gid[5];
 737         bool removed_entry = false;
 738
 739         mailbox = mlx4_alloc_cmd_mailbox(dev);
 740         if (IS_ERR(mailbox))
 741                 return PTR_ERR(mailbox);
 742         mgm = mailbox->buf;
 743
 744         mutex_lock(&priv->mcg_table.mutex);
 745
 746         err = find_entry(dev, port, gid, prot,
 747                          mailbox, &prev, &index);
 748         if (err)
 749                 goto out;
 750
 751         if (index == -1) {
 752                 mlx4_err(dev, "MGID %pI6 not found\n", gid);
 753                 err = -EINVAL;
 754                 goto out;
 755         }
 756
 757         /* if this pq is also a promisc qp, it shouldn't be removed */
 758         if (prot == MLX4_PROT_ETH &&
 759             check_duplicate_entry(dev, port, steer, index, qp->qpn))
 760                 goto out;
 761
 762         members_count = be32_to_cpu(mgm->members_count) & 0xffffff;
 763         for (loc = -1, i = 0; i < members_count; ++i)
 764                 if ((be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK) == qp->qpn)
 765                         loc = i;
 766
 767         if (loc == -1) {
 768                 mlx4_err(dev, "QP %06x not found in MGM\n", qp->qpn);
 769                 err = -EINVAL;
 770                 goto out;
 771         }
 772
 773
 774         mgm->members_count = cpu_to_be32(--members_count | (u32) prot << 30);
 775         mgm->qp[loc]       = mgm->qp[i - 1];
 776         mgm->qp[i - 1]     = 0;
 777
 778         if (prot == MLX4_PROT_ETH)
 779                 removed_entry = can_remove_steering_entry(dev, port, steer,
 780                                                                 index, qp->qpn);
 781         if (i != 1 && (prot != MLX4_PROT_ETH || !removed_entry)) {
 782                 err = mlx4_WRITE_ENTRY(dev, index, mailbox);
 783                 goto out;
 784         }
 785
 786         /* We are going to delete the entry, members count should be 0 */
 787         mgm->members_count = cpu_to_be32((u32) prot << 30);
 788
 789         if (prev == -1) {
 790                 /* Remove entry from MGM */
 791                 int amgm_index = be32_to_cpu(mgm->next_gid_index) >> 6;
 792                 if (amgm_index) {
 793                         err = mlx4_READ_ENTRY(dev, amgm_index, mailbox);
 794                         if (err)
 795                                 goto out;
 796                 } else
 797                         memset(mgm->gid, 0, 16);
 798
 799                 err = mlx4_WRITE_ENTRY(dev, index, mailbox);
 800                 if (err)
 801                         goto out;
 802
 803                 if (amgm_index) {
 804                         if (amgm_index < dev->caps.num_mgms)
 805                                 mlx4_warn(dev, "MGM entry %d had AMGM index %d < %d",
 806                                           index, amgm_index, dev->caps.num_mgms);
 807                         else
 808                                 mlx4_bitmap_free(&priv->mcg_table.bitmap,
 809                                                  amgm_index - dev->caps.num_mgms);
 810                 }
 811         } else {
 812                 /* Remove entry from AMGM */
 813                 int cur_next_index = be32_to_cpu(mgm->next_gid_index) >> 6;
 814                 err = mlx4_READ_ENTRY(dev, prev, mailbox);
 815                 if (err)
 816                         goto out;
 817
 818                 mgm->next_gid_index = cpu_to_be32(cur_next_index << 6);
 819
 820                 err = mlx4_WRITE_ENTRY(dev, prev, mailbox);
 821                 if (err)
 822                         goto out;
 823
 824                 if (index < dev->caps.num_mgms)
 825                         mlx4_warn(dev, "entry %d had next AMGM index %d < %d",
 826                                   prev, index, dev->caps.num_mgms);
 827                 else
 828                         mlx4_bitmap_free(&priv->mcg_table.bitmap,
 829                                          index - dev->caps.num_mgms);
 830         }
 831
 832 out:
 833         mutex_unlock(&priv->mcg_table.mutex);
 834
 835         mlx4_free_cmd_mailbox(dev, mailbox);
 836         return err;
 837 }
 838
 839 static int mlx4_QP_ATTACH(struct mlx4_dev *dev, struct mlx4_qp *qp,
 840                           u8 gid[16], u8 attach, u8 block_loopback,
 841                           enum mlx4_protocol prot)
 842 {
 843         struct mlx4_cmd_mailbox *mailbox;
 844         int err = 0;
 845         int qpn;
 846
 847         if (!mlx4_is_mfunc(dev))
 848                 return -EBADF;
 849
 850         mailbox = mlx4_alloc_cmd_mailbox(dev);
 851         if (IS_ERR(mailbox))
 852                 return PTR_ERR(mailbox);
 853
 854         memcpy(mailbox->buf, gid, 16);
 855         qpn = qp->qpn;
 856         qpn |= (prot << 28);
 857         if (attach && block_loopback)
 858                 qpn |= (1 << 31);
 859
 860         err = mlx4_cmd(dev, mailbox->dma, qpn, attach,
 861                        MLX4_CMD_QP_ATTACH, MLX4_CMD_TIME_CLASS_A,
 862                        MLX4_CMD_WRAPPED);
 863
 864         mlx4_free_cmd_mailbox(dev, mailbox);
 865         return err;
 866 }
 867
 868 int mlx4_multicast_attach(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16],
 869                           int block_mcast_loopback, enum mlx4_protocol prot)
 870 {
 871
 872         switch (dev->caps.steering_mode) {
 873         case MLX4_STEERING_MODE_A0:
 874                 if (prot == MLX4_PROT_ETH)
 875                         return 0;
 876
 877         case MLX4_STEERING_MODE_B0:
 878                 if (prot == MLX4_PROT_ETH)
 879                         gid[7] |= (MLX4_MC_STEER << 1);
 880
 881                 if (mlx4_is_mfunc(dev))
 882                         return mlx4_QP_ATTACH(dev, qp, gid, 1,
 883                                               block_mcast_loopback, prot);
 884                 return mlx4_qp_attach_common(dev, qp, gid,
 885                                              block_mcast_loopback, prot,
 886                                              MLX4_MC_STEER);
 887
 888         default:
 889                 return -EINVAL;
 890         }
 891 }
 892 EXPORT_SYMBOL_GPL(mlx4_multicast_attach);
 893
 894 int mlx4_multicast_detach(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16],
 895                           enum mlx4_protocol prot)
 896 {
 897         switch (dev->caps.steering_mode) {
 898         case MLX4_STEERING_MODE_A0:
 899                 if (prot == MLX4_PROT_ETH)
 900                         return 0;
 901
 902         case MLX4_STEERING_MODE_B0:
 903                 if (prot == MLX4_PROT_ETH)
 904                         gid[7] |= (MLX4_MC_STEER << 1);
 905
 906                 if (mlx4_is_mfunc(dev))
 907                         return mlx4_QP_ATTACH(dev, qp, gid, 0, 0, prot);
 908
 909                 return mlx4_qp_detach_common(dev, qp, gid, prot,
 910                                              MLX4_MC_STEER);
 911
 912         default:
 913                 return -EINVAL;
 914         }
 915 }
 916 EXPORT_SYMBOL_GPL(mlx4_multicast_detach);
 917
 918 int mlx4_unicast_attach(struct mlx4_dev *dev,
 919                         struct mlx4_qp *qp, u8 gid[16],
 920                         int block_mcast_loopback, enum mlx4_protocol prot)
 921 {
 922         if (prot == MLX4_PROT_ETH)
 923                 gid[7] |= (MLX4_UC_STEER << 1);
 924
 925         if (mlx4_is_mfunc(dev))
 926                 return mlx4_QP_ATTACH(dev, qp, gid, 1,
 927                                         block_mcast_loopback, prot);
 928
 929         return mlx4_qp_attach_common(dev, qp, gid, block_mcast_loopback,
 930                                         prot, MLX4_UC_STEER);
 931 }
 932 EXPORT_SYMBOL_GPL(mlx4_unicast_attach);
 933
 934 int mlx4_unicast_detach(struct mlx4_dev *dev, struct mlx4_qp *qp,
 935                                u8 gid[16], enum mlx4_protocol prot)
 936 {
 937         if (prot == MLX4_PROT_ETH)
 938                 gid[7] |= (MLX4_UC_STEER << 1);
 939
 940         if (mlx4_is_mfunc(dev))
 941                 return mlx4_QP_ATTACH(dev, qp, gid, 0, 0, prot);
 942
 943         return mlx4_qp_detach_common(dev, qp, gid, prot, MLX4_UC_STEER);
 944 }
 945 EXPORT_SYMBOL_GPL(mlx4_unicast_detach);
 946
 947 int mlx4_PROMISC_wrapper(struct mlx4_dev *dev, int slave,
 948                          struct mlx4_vhcr *vhcr,
 949                          struct mlx4_cmd_mailbox *inbox,
 950                          struct mlx4_cmd_mailbox *outbox,
 951                          struct mlx4_cmd_info *cmd)
 952 {
 953         u32 qpn = (u32) vhcr->in_param & 0xffffffff;
 954         u8 port = vhcr->in_param >> 62;
 955         enum mlx4_steer_type steer = vhcr->in_modifier;
 956
 957         /* Promiscuous unicast is not allowed in mfunc */
 958         if (mlx4_is_mfunc(dev) && steer == MLX4_UC_STEER)
 959                 return 0;
 960
 961         if (vhcr->op_modifier)
 962                 return add_promisc_qp(dev, port, steer, qpn);
 963         else
 964                 return remove_promisc_qp(dev, port, steer, qpn);
 965 }
 966
 967 static int mlx4_PROMISC(struct mlx4_dev *dev, u32 qpn,
 968                         enum mlx4_steer_type steer, u8 add, u8 port)
 969 {
 970         return mlx4_cmd(dev, (u64) qpn | (u64) port << 62, (u32) steer, add,
 971                         MLX4_CMD_PROMISC, MLX4_CMD_TIME_CLASS_A,
 972                         MLX4_CMD_WRAPPED);
 973 }
 974
 975 int mlx4_multicast_promisc_add(struct mlx4_dev *dev, u32 qpn, u8 port)
 976 {
 977         if (mlx4_is_mfunc(dev))
 978                 return mlx4_PROMISC(dev, qpn, MLX4_MC_STEER, 1, port);
 979
 980         return add_promisc_qp(dev, port, MLX4_MC_STEER, qpn);
 981 }
 982 EXPORT_SYMBOL_GPL(mlx4_multicast_promisc_add);
 983
 984 int mlx4_multicast_promisc_remove(struct mlx4_dev *dev, u32 qpn, u8 port)
 985 {
 986         if (mlx4_is_mfunc(dev))
 987                 return mlx4_PROMISC(dev, qpn, MLX4_MC_STEER, 0, port);
 988
 989         return remove_promisc_qp(dev, port, MLX4_MC_STEER, qpn);
 990 }
 991 EXPORT_SYMBOL_GPL(mlx4_multicast_promisc_remove);
 992
 993 int mlx4_unicast_promisc_add(struct mlx4_dev *dev, u32 qpn, u8 port)
 994 {
 995         if (mlx4_is_mfunc(dev))
 996                 return mlx4_PROMISC(dev, qpn, MLX4_UC_STEER, 1, port);
 997
 998         return add_promisc_qp(dev, port, MLX4_UC_STEER, qpn);
 999 }
1000 EXPORT_SYMBOL_GPL(mlx4_unicast_promisc_add);
1001
1002 int mlx4_unicast_promisc_remove(struct mlx4_dev *dev, u32 qpn, u8 port)
1003 {
1004         if (mlx4_is_mfunc(dev))
1005                 return mlx4_PROMISC(dev, qpn, MLX4_UC_STEER, 0, port);
1006
1007         return remove_promisc_qp(dev, port, MLX4_UC_STEER, qpn);
1008 }
1009 EXPORT_SYMBOL_GPL(mlx4_unicast_promisc_remove);
1010
1011 int mlx4_init_mcg_table(struct mlx4_dev *dev)
1012 {
1013         struct mlx4_priv *priv = mlx4_priv(dev);
1014         int err;
1015
1016         err = mlx4_bitmap_init(&priv->mcg_table.bitmap, dev->caps.num_amgms,
1017                                dev->caps.num_amgms - 1, 0, 0);
1018         if (err)
1019                 return err;
1020
1021         mutex_init(&priv->mcg_table.mutex);
1022
1023         return 0;
1024 }
1025
1026 void mlx4_cleanup_mcg_table(struct mlx4_dev *dev)
1027 {
1028         mlx4_bitmap_cleanup(&mlx4_priv(dev)->mcg_table.bitmap);
1029 }