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authorEyal Bari <ebari@cisco.com>2018-09-02 17:08:22 +0300
committerDamjan Marion <dmarion@me.com>2018-09-04 17:28:49 +0000
commitceb8d5afcb43327eaee019848fad1a57e7aecc6e (patch)
treec2c33778087a807f506814a58c0321459c05f083 /src/vnet/l2
parent3b9bf6f1b48f983ec9a383389ca55b1b15c306e1 (diff)
l2_output:skip processing if no features are enabled
Change-Id: I7fcc082376b451c6179ec2ef58f98c931adfed27 Signed-off-by: Eyal Bari <ebari@cisco.com>
Diffstat (limited to 'src/vnet/l2')
-rw-r--r--src/vnet/l2/l2_output.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/src/vnet/l2/l2_output.c b/src/vnet/l2/l2_output.c
index 2811215307f..321a531e19f 100644
--- a/src/vnet/l2/l2_output.c
+++ b/src/vnet/l2/l2_output.c
@@ -260,8 +260,12 @@ l2output_process_batch (vlib_main_t * vm, vlib_node_runtime_t * node,
{
u32 feature_bitmap = config->feature_bitmap & ~L2OUTPUT_FEAT_OUTPUT;
if (config->shg == 0 && feature_bitmap == 0)
- l2output_process_batch_inline (vm, node, config, b, cdo, next, n_left,
- l2_efp, l2_vtr, l2_pbb, 0, 0);
+ {
+ if ((l2_efp | l2_vtr | l2_pbb) == 0)
+ return;
+ l2output_process_batch_inline (vm, node, config, b, cdo, next, n_left,
+ l2_efp, l2_vtr, l2_pbb, 0, 0);
+ }
else if (config->shg == 0)
l2output_process_batch_inline (vm, node, config, b, cdo, next, n_left,
l2_efp, l2_vtr, l2_pbb, 0, 1);
ref='#n187'>187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 
/*
 * Copyright (c) 2016 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <vppinfra/vec.h>

#include <vnet/bier/bier_table.h>
#include <vnet/bier/bier_entry.h>
#include <vnet/bier/bier_update.h>
#include <vnet/bier/bier_fmask_db.h>
#include <vnet/bier/bier_fmask.h>
#include <vnet/bier/bier_bift_table.h>

#include <vnet/fib/mpls_fib.h>
#include <vnet/mpls/mpls.h>
#include <vnet/fib/fib_path_list.h>

/**
 * Memory pool of all the allocated tables
 */
bier_table_t *bier_table_pool;

/**
 * DB store of all BIER tables index by SD/set/hdr-len
 */
static uword *bier_tables_by_key;

/**
 * The magic number of BIER ECMP tables to create.
 * The load-balance distribution algorithm will use a power of 2
 * for the number of buckets, which constrains the choice.
 */
#define BIER_N_ECMP_TABLES 16

static inline index_t
bier_table_get_index (const bier_table_t *bt)
{
    return (bt - bier_table_pool);
}

int
bier_table_is_main (const bier_table_t *bt)
{
    return (BIER_ECMP_TABLE_ID_MAIN == bt->bt_id.bti_ecmp);
}

/*
 * Construct the key to use to find a BIER table
 * in the global hash map
 */
static u32
bier_table_mk_key (const bier_table_id_t *id)
{
    /*
     * the set and sub-domain Ids are 8 bit values.
     * we have space for ECMP table ID and talbe type (SPF/TE)
     * for later
     */
    u32 key = ((id->bti_sub_domain << 24)  |
               (id->bti_set << 16) |
               (id->bti_ecmp << 8) |
               (id->bti_hdr_len << 4) |
               (id->bti_type));

    return (key);
}

static void
bier_table_init (bier_table_t *bt,
                 const bier_table_id_t *id,
                 mpls_label_t ll)
{
    u32 num_entries;

    bt->bt_lfei = FIB_NODE_INDEX_INVALID;
    bt->bt_id = *id;
    bt->bt_ll = ll;
    num_entries = bier_hdr_len_id_to_num_bits(bt->bt_id.bti_hdr_len);

    /*
     * create the lookup table of entries.
     */
    if (bier_table_is_main(bt))
    {
        vec_validate_init_empty_aligned(bt->bt_entries,
                                        num_entries,
                                        INDEX_INVALID,
                                        CLIB_CACHE_LINE_BYTES);
    }
    else
    {
        vec_validate_init_empty_aligned(bt->bt_fmasks,
                                        num_entries,
                                        INDEX_INVALID,
                                        CLIB_CACHE_LINE_BYTES);
    }
}

static void
bier_table_rm_bift (bier_table_t *bt)
{
    ASSERT(MPLS_LABEL_INVALID == bt->bt_ll);

    bier_bift_table_entry_remove(bier_bift_id_encode(bt->bt_id.bti_set,
                                                     bt->bt_id.bti_sub_domain,
                                                     bt->bt_id.bti_hdr_len));
}

static void
bier_table_mk_bift (bier_table_t *bt)
{
    dpo_id_t dpo = DPO_INVALID;

    ASSERT(MPLS_LABEL_INVALID == bt->bt_ll);

    bier_table_contribute_forwarding(bier_table_get_index(bt), &dpo);

    bier_bift_table_entry_add(bier_bift_id_encode(bt->bt_id.bti_set,
                                                  bt->bt_id.bti_sub_domain,
                                                  bt->bt_id.bti_hdr_len),
                               &dpo);

    dpo_reset(&dpo);
}

static void
bier_table_rm_lfib (bier_table_t *bt)
{
    if (FIB_NODE_INDEX_INVALID != bt->bt_lfei)
    {
        fib_table_entry_delete_index(bt->bt_lfei,
                                     FIB_SOURCE_BIER);
        fib_table_unlock(MPLS_FIB_DEFAULT_TABLE_ID,
                         FIB_PROTOCOL_MPLS,
                         FIB_SOURCE_BIER);
    }
    bt->bt_lfei = FIB_NODE_INDEX_INVALID;
}

static void
bier_table_destroy (bier_table_t *bt)
{
    if (bier_table_is_main(bt))
    {
        index_t *bei;

        if (MPLS_LABEL_INVALID != bt->bt_ll)
        {
            bier_table_rm_lfib(bt);
        }
        else
        {
            bier_table_rm_bift(bt);
        }

        fib_path_list_unlock(bt->bt_pl);
        bt->bt_pl = FIB_NODE_INDEX_INVALID;
        /*
         * unresolve/remove all entries from the table
         */
        vec_foreach (bei, bt->bt_entries)
        {
            if (INDEX_INVALID != *bei)
            {
                bier_entry_delete(*bei);
            }
        }
        vec_free (bt->bt_entries);
    }
    else
    {
        index_t *bfmi;

        /*
         * unlock any fmasks
         */
        vec_foreach (bfmi, bt->bt_fmasks)
        {
            bier_fmask_unlock(*bfmi);
        }
        vec_free(bt->bt_fmasks);
    }

    hash_unset(bier_tables_by_key,
               bier_table_mk_key(&bt->bt_id));
    pool_put(bier_table_pool, bt);
}

static void
bier_table_lock_i (bier_table_t *bt)
{
    bt->bt_locks++;
}

static void
bier_table_unlock_i (bier_table_t *bt)
{
    bt->bt_locks--;

    if (0 == bt->bt_locks)
    {
        bier_table_destroy(bt);
    }
}

void
bier_table_unlock (const bier_table_id_t *bti)
{
    uword *p;
    u32 key;

    key = bier_table_mk_key(bti);

    p = hash_get (bier_tables_by_key, key);

    if (NULL != p) {
        bier_table_unlock_i(bier_table_get(p[0]));
    }
}

static void
bier_table_mk_lfib (bier_table_t *bt)
{
    /*
     * Add a new MPLS lfib entry
     */
    if (MPLS_LABEL_INVALID != bt->bt_ll) {
        fib_prefix_t pfx = {
            .fp_proto = FIB_PROTOCOL_MPLS,
            .fp_len = 21,
            .fp_label = bt->bt_ll,
            .fp_eos = MPLS_EOS,
            .fp_payload_proto = DPO_PROTO_BIER,
        };
        u32 mpls_fib_index;
        dpo_id_t dpo = DPO_INVALID;

        fib_table_find_or_create_and_lock(FIB_PROTOCOL_MPLS,
                                          MPLS_FIB_DEFAULT_TABLE_ID,
                                          FIB_SOURCE_BIER);

        /*
         * stack the entry on the forwarding chain produced by the
         * path-list via the ECMP tables.
         */
        fib_path_list_contribute_forwarding(bt->bt_pl,
                                            FIB_FORW_CHAIN_TYPE_BIER,
                                            FIB_PATH_LIST_FWD_FLAG_COLLAPSE,
                                            &dpo);

        mpls_fib_index = fib_table_find(FIB_PROTOCOL_MPLS,
                                        MPLS_FIB_DEFAULT_TABLE_ID);
        bt->bt_lfei = fib_table_entry_special_dpo_add(mpls_fib_index,
                                                      &pfx,
                                                      FIB_SOURCE_BIER,
                                                      FIB_ENTRY_FLAG_EXCLUSIVE,
                                                      &dpo);
        dpo_reset(&dpo);
    }
}

static bier_table_t *
bier_table_find (const bier_table_id_t *bti)
{
    uword *p;
    u32 key;

    key = bier_table_mk_key(bti);

    p = hash_get(bier_tables_by_key, key);

    if (NULL != p)
    {
        return (bier_table_get(p[0]));
    }

    return (NULL);
}

static bier_table_t *
bier_table_mk_ecmp (index_t bti)
{
    fib_route_path_t *rpaths;
    fib_node_index_t pli;
    bier_table_t *bt;
    int ii;

    rpaths = NULL;
    bt = bier_table_get(bti);

    vec_validate(rpaths, BIER_N_ECMP_TABLES-1);

    vec_foreach_index(ii, rpaths)
    {
        rpaths[ii].frp_bier_tbl = bt->bt_id;
        rpaths[ii].frp_bier_tbl.bti_ecmp = ii;
        rpaths[ii].frp_flags = FIB_ROUTE_PATH_BIER_TABLE;
    }

    /*
     * no opportunity to share, this the resolving ECMP tables are unique
     * to this table.
     * no need to be a child of the path list, we can do nothing with any
     * notifications it would generate [not that it will].
     */
    pli = fib_path_list_create(FIB_PATH_LIST_FLAG_NO_URPF, rpaths);
    fib_path_list_lock(pli);

    /*
     * constructing the path-list will have created many more BIER tables,
     * so this main table will no doubt have re-alloc.
     */
    bt = bier_table_get(bti);
    bt->bt_pl = pli;

    vec_free(rpaths);

    return (bt);
}


static index_t
bier_table_create (const bier_table_id_t *btid,
                   mpls_label_t local_label)
{
    /*
     * add a new table
     */
    bier_table_t *bt;
    index_t bti;
    u32 key;

    key = bier_table_mk_key(btid);

    pool_get_aligned(bier_table_pool, bt, CLIB_CACHE_LINE_BYTES);
    bier_table_init(bt, btid, local_label);

    hash_set(bier_tables_by_key, key, bier_table_get_index(bt));
    bti = bier_table_get_index(bt);

    if (bier_table_is_main(bt))
    {
        bt = bier_table_mk_ecmp(bti);

        /*
         * add whichever mpls-fib or bift we need
         */
        if (local_label != MPLS_LABEL_INVALID)
        {
            bt->bt_ll = local_label;
            bier_table_mk_lfib(bt);
        }
        else
        {
            bier_table_mk_bift(bt);
        }
    }

    return (bti);
}

index_t
bier_table_lock (const bier_table_id_t *btid)
{
    bier_table_t *bt;
    index_t bti;

    bt = bier_table_find(btid);

    if (NULL == bt)
    {
        bti = bier_table_create(btid, MPLS_LABEL_INVALID);
        bt = bier_table_get(bti);
    }
    else
    {
        bti = bier_table_get_index(bt);
    }

    bier_table_lock_i(bt);

    return (bti);
}

index_t
bier_table_add_or_lock (const bier_table_id_t *btid,
                        mpls_label_t local_label)
{
    bier_table_t *bt;
    index_t bti;

    bt = bier_table_find(btid);

    if (NULL != bt) {
        /*
         * modify an existing table.
         * change the lfib entry to the new local label
         */
        if (bier_table_is_main(bt))
        {
            /*
             * remove the mpls-fib or bift entry
             */
            if (MPLS_LABEL_INVALID != bt->bt_ll)
            {
                bier_table_rm_lfib(bt);
            }
            else
            {
                bier_table_rm_bift(bt);
            }

            /*
             * reset
             */
            bt->bt_ll = MPLS_LABEL_INVALID;

            /*
             * add whichever mpls-fib or bift we need
             */
            if (local_label != MPLS_LABEL_INVALID)
            {
                bt->bt_ll = local_label;
                bier_table_mk_lfib(bt);
            }
            else
            {
                bier_table_mk_bift(bt);
            }
        }
        bti = bier_table_get_index(bt);
    }
    else
    {
        bti = bier_table_create(btid, local_label);
        bt = bier_table_get(bti);
    }

    bier_table_lock_i(bt);

    return (bti);
}

index_t
bier_table_ecmp_create_and_lock (const bier_table_id_t *btid)
{
    return (bier_table_add_or_lock(btid, MPLS_LABEL_INVALID));
}

void
bier_table_ecmp_unlock (index_t bti)
{
    bier_table_unlock_i(bier_table_get(bti));
}

static void
bier_table_dpo_lock (dpo_id_t *dpo)
{
}

static void
bier_table_dpo_unlock (dpo_id_t *dpo)
{
}

static void
bier_table_dpo_mem_show (void)
{
    fib_show_memory_usage("BIER-table",
                          pool_elts(bier_table_pool),
                          pool_len(bier_table_pool),
                          sizeof(bier_table_t));
}
static u8 *
format_bier_table_dpo (u8 *s, va_list *ap)
{
    index_t bti = va_arg(*ap, index_t);
    bier_table_t *bt;

    bt = bier_table_get(bti);

    return (format(s, "[%U]", format_bier_table_id, &bt->bt_id));
}

const static dpo_vft_t bier_table_dpo_vft = {
    .dv_lock = bier_table_dpo_lock,
    .dv_unlock = bier_table_dpo_unlock,
    .dv_format = format_bier_table_dpo,
    .dv_mem_show = bier_table_dpo_mem_show,
};

const static char *const bier_table_mpls_nodes[] =
{
    "bier-input",
    NULL
};
const static char * const * const bier_table_nodes[DPO_PROTO_NUM] =
{
    [DPO_PROTO_BIER] = bier_table_mpls_nodes,
};

static clib_error_t *
bier_table_module_init (vlib_main_t *vm)
{
    dpo_register(DPO_BIER_TABLE, &bier_table_dpo_vft, bier_table_nodes);

    return (NULL);
}

VLIB_INIT_FUNCTION (bier_table_module_init);

const bier_table_id_t *
bier_table_get_id (index_t bti)
{
    bier_table_t *bt;

    bt = bier_table_get(bti);

    return (&bt->bt_id);
}

static void
bier_table_insert (bier_table_t *bt,
                   bier_bp_t bp,
                   index_t bei)
{
    bt->bt_entries[BIER_BP_TO_INDEX(bp)] = bei;
}

static void
bier_table_remove (bier_table_t *bt,
                   bier_bp_t bp)
{
    bt->bt_entries[BIER_BP_TO_INDEX(bp)] = INDEX_INVALID;
}

void
bier_table_route_path_update_i (const bier_table_id_t *btid,
                                bier_bp_t bp,
                                fib_route_path_t *brps,
                                u8 is_replace)
{
    index_t bfmi, bti, bei, *bfmip, *bfmis = NULL;
    fib_route_path_t *brp;
    bier_table_t *bt;

    bt = bier_table_find(btid);

    if (NULL == bt) {
        return;
    }

    bti = bier_table_get_index(bt);
    bei = bier_table_lookup(bt, bp);

    /*
     * set the FIB index in the path to the BIER table index
     */
    vec_foreach(brp, brps)
    {
        /*
         * First use the path to find or construct an FMask object
         * via the next-hop
         */
        bfmi = bier_fmask_db_find_or_create_and_lock(bti, brp);
        vec_add1(bfmis, bfmi);

        /*
         * then modify the path to resolve via this fmask object
         * and use it to resolve the BIER entry.
         */
        brp->frp_flags = FIB_ROUTE_PATH_BIER_FMASK;
        brp->frp_bier_fmask = bfmi;
    }

    if (INDEX_INVALID == bei)
    {
        bei = bier_entry_create(bti, bp);
        bier_table_insert(bt, bp, bei);
    }

    if (is_replace)
    {
        bier_entry_path_update(bei, brps);
    }
    else
    {
        fib_route_path_t *t_paths = NULL;

        vec_foreach(brp, brps)
        {
            vec_add1(t_paths, *brp);
            bier_entry_path_add(bei, t_paths);
            vec_reset_length(t_paths);
        }
        vec_free(t_paths);
    }

    vec_foreach(bfmip, bfmis)
    {
        bier_fmask_unlock(*bfmip);
    }
    vec_free(bfmis);
}

void
bier_table_route_path_update (const bier_table_id_t *btid,
                              bier_bp_t bp,
                              fib_route_path_t *brps)
{
    bier_table_route_path_update_i(btid, bp, brps, 1);
}
void
bier_table_route_path_add (const bier_table_id_t *btid,
                           bier_bp_t bp,
                           fib_route_path_t *brps)
{
    bier_table_route_path_update_i(btid, bp, brps, 0);
}

void
bier_table_route_delete (const bier_table_id_t *btid,
                         bier_bp_t bp)
{
    bier_table_t *bt;
    index_t bei;

    bt = bier_table_find(btid);

    if (NULL == bt) {
        return;
    }

    bei = bier_table_lookup(bt, bp);

    if (INDEX_INVALID == bei)
    {
        /* no such entry */
        return;
    }

    bier_table_remove(bt, bp);
    bier_entry_delete(bei);
}

void
bier_table_route_path_remove (const bier_table_id_t *btid,
                              bier_bp_t bp,
                              fib_route_path_t *brps)
{
    fib_route_path_t *brp = NULL, *t_paths = NULL;
    index_t bfmi, bti, bei;
    bier_table_t *bt;
    u32 ii;

    bt = bier_table_find(btid);

    if (NULL == bt) {
        return;
    }

    bti = bier_table_get_index(bt);
    bei = bier_table_lookup(bt, bp);

    if (INDEX_INVALID == bei)
    {
        /* no such entry */
        return;
    }

    /*
     * set the FIB index in the path to the BIER table index
     */
    vec_foreach_index(ii, brps)
    {
        brp = &brps[ii];
        bfmi = bier_fmask_db_find(bti, brp);

        if (INDEX_INVALID == bfmi)
        {
            /*
             * no matching fmask, not a path we can remove
             */
            vec_del1(brps, ii);
            continue;
        }

        /*
         * then modify the path to resolve via this fmask object
         * and use it to resolve the BIER entry.
         */
        brp->frp_flags = FIB_ROUTE_PATH_BIER_FMASK;
        brp->frp_bier_fmask = bfmi;
    }

    if (0 == vec_len(brps))
    {
        return;
    }

    vec_foreach(brp, brps)
    {
        vec_add1(t_paths, *brp);
        if (0 == bier_entry_path_remove(bei, t_paths))
        {
            /* 0 remaining paths */
            bier_table_remove(bt, bp);
            bier_entry_delete(bei);
            break;
        }
        vec_reset_length(t_paths);
    }
    vec_free(t_paths);
}

void
bier_table_contribute_forwarding (index_t bti,
                                  dpo_id_t *dpo)
{
    bier_table_t *bt;

    bt = bier_table_get(bti);

    if (BIER_ECMP_TABLE_ID_MAIN == bt->bt_id.bti_ecmp)
    {
        /*
         * return the load-balance for the ECMP tables
         */
        fib_path_list_contribute_forwarding(bt->bt_pl,
                                            FIB_FORW_CHAIN_TYPE_BIER,
                                            FIB_PATH_LIST_FWD_FLAG_COLLAPSE,
                                            dpo);
    }
    else
    {
        dpo_set(dpo, DPO_BIER_TABLE, DPO_PROTO_BIER, bti);
    }
}

typedef struct bier_table_ecmp_walk_ctx_t_
{
    bier_table_ecmp_walk_fn_t fn;
    void *ctx;
} bier_table_ecmp_walk_ctx_t;

static fib_path_list_walk_rc_t
bier_table_ecmp_walk_path_list (fib_node_index_t pl_index,
                                fib_node_index_t path_index,
                                void *arg)
{
    bier_table_ecmp_walk_ctx_t *ctx = arg;

    ctx->fn(fib_path_get_resolving_index(path_index), ctx->ctx);
    /* continue */
    return (FIB_PATH_LIST_WALK_CONTINUE);
}

void
bier_table_ecmp_walk (index_t bti,
                      bier_table_ecmp_walk_fn_t fn,
                      void *ctx)
{
    bier_table_ecmp_walk_ctx_t ewc = {
        .fn = fn,
        .ctx = ctx,
    };
    bier_table_t *bt;

    bt = bier_table_get(bti);

    if (FIB_NODE_INDEX_INVALID != bt->bt_pl)
    {
        fib_path_list_walk(bt->bt_pl,
                           bier_table_ecmp_walk_path_list,
                           &ewc);
    }
}

void
bier_table_ecmp_set_fmask (index_t bti,
                           bier_bp_t bp,
                           index_t bfmi)
{
    bier_table_t *bt;

    bt = bier_table_get(bti);

    /*
     * we hold a lock for fmasks in the table
     */
    bier_fmask_lock(bfmi);
    bier_fmask_unlock(bt->bt_fmasks[BIER_BP_TO_INDEX(bp)]);

    bt->bt_fmasks[BIER_BP_TO_INDEX(bp)] = bfmi;
}

u8 *
format_bier_table_entry (u8 *s, va_list *ap)
{
    index_t bti = va_arg(*ap, index_t);
    bier_bp_t bp = va_arg(*ap, bier_bp_t);
    bier_table_t *bt;
    bt = bier_table_get(bti);

    if (bier_table_is_main(bt))
    {
        index_t bei;

        bei = bier_table_lookup(bier_table_get(bti), bp);

        if (INDEX_INVALID != bei)
        {
            s = format(s, "%U", format_bier_entry, bei,
                       BIER_SHOW_DETAIL);
        }
    }
    else
    {
        index_t bfmi;

        bfmi = bier_table_fwd_lookup(bier_table_get(bti), bp);

        if (INDEX_INVALID != bfmi)
        {
            s = format(s, "%U", format_bier_fmask, bfmi,
                       BIER_SHOW_DETAIL);
        }
    }
    return (s);
}

u8 *
format_bier_table (u8 *s, va_list *ap)
{
    index_t bti = va_arg(*ap, index_t);
    bier_show_flags_t flags = va_arg(*ap, bier_show_flags_t);
    bier_table_t *bt;

    if (pool_is_free_index(bier_table_pool, bti))
    {
        return (format(s, "No BIER table %d", bti));
    }

    bt = bier_table_get(bti);

    s = format(s, "[@%d] bier-table:[%U local-label:%U",
               bti,
               format_bier_table_id, &bt->bt_id,
               format_mpls_unicast_label, bt->bt_ll);

    if (flags & BIER_SHOW_DETAIL)
    {
        s = format(s, " locks:%d", bt->bt_locks);
    }
    s = format(s, "]");

    if (flags & BIER_SHOW_DETAIL)
    {
        if (bier_table_is_main(bt))
        {
            index_t *bei;

            vec_foreach (bei, bt->bt_entries)
            {
                if (INDEX_INVALID != *bei)
                {
                    s = format(s, "\n%U", format_bier_entry, *bei, 2);
                }
            }
        }
        else
        {
            u32 ii;

            vec_foreach_index (ii, bt->bt_fmasks)
            {
                if (INDEX_INVALID != bt->bt_fmasks[ii])
                {
                    s = format(s, "\n bp:%d\n %U", ii,
                               format_bier_fmask, bt->bt_fmasks[ii], 2);
                }
            }
        }
    }

    return (s);
}

void
bier_table_show_all (vlib_main_t * vm,
                     bier_show_flags_t flags)
{
    if (!pool_elts(bier_table_pool))
    {
        vlib_cli_output (vm, "No BIER tables");
    }
    else
    {
        int ii;

        pool_foreach_index (ii, bier_table_pool)
         {
            vlib_cli_output (vm, "%U", format_bier_table, ii, flags);
        }
    }
}

void
bier_tables_walk (bier_tables_walk_fn_t fn,
                  void *ctx)
{
    ASSERT(0);
}


void
bier_table_walk (const bier_table_id_t *bti,
                 bier_table_walk_fn_t fn,
                 void *ctx)
{
    bier_table_t *bt;
    bier_entry_t *be;
    index_t *bei;

    bt = bier_table_find(bti);

    if (NULL == bt)
    {
        return;
    }

    vec_foreach (bei, bt->bt_entries)
    {
        if (INDEX_INVALID != *bei)
        {
            be = bier_entry_get(*bei);

            fn(bt, be, ctx);
        }
    }
}