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/*
* Copyright (c) 2020 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 <vnet/adj/adj_delegate.h>
#include <linux-cp/lcp_interface.h>
#include <linux-cp/lcp_adj.h>
#include <vppinfra/bihash_32_8.h>
#include <vppinfra/bihash_template.c>
static adj_delegate_type_t adj_type;
static lcp_adj_key_t *adj_keys;
/**
* The table of adjacencies indexed by the rewrite string
*/
BVT (clib_bihash) lcp_adj_tbl;
static_always_inline void
lcp_adj_mk_key_adj (const ip_adjacency_t *adj, lcp_adj_key_t *key)
{
lcp_adj_mk_key (adj->rewrite_header.data, adj->rewrite_header.data_bytes,
adj->rewrite_header.sw_if_index, key);
}
static u8 *
lcp_adj_delegate_format (const adj_delegate_t *aed, u8 *s)
{
return (format (s, "lcp"));
}
static void
lcp_adj_delegate_adj_deleted (adj_delegate_t *aed)
{
ip_adjacency_t *adj;
lcp_adj_kv_t kv;
adj = adj_get (aed->ad_adj_index);
lcp_adj_mk_key_adj (adj, &kv.k);
BV (clib_bihash_add_del) (&lcp_adj_tbl, &kv.kv, 0);
if (aed->ad_index != INDEX_INVALID)
pool_put_index (adj_keys, aed->ad_index);
}
/* when an adj is modified:
*
* An existing hash entry may need to be deleted. This may occur when:
* * The newly modified adj does not have IP_LOOKUP_NEXT_REWRITE as next idx
* * The rewrite (== major component of hash key) changed
*
* A new hash entry may need to be added. This may occur when:
* * The newly modified adj has IP_LOOKUP_NEXT_REWRITE as next idx
* * The rewrite changed or there was no existing hash entry
*/
static void
lcp_adj_delegate_adj_modified (adj_delegate_t *aed)
{
ip_adjacency_t *adj;
lcp_adj_kv_t kv;
lcp_adj_key_t *adj_key = NULL;
u8 save_adj, key_changed;
key_changed = 0;
adj = adj_get (aed->ad_adj_index);
save_adj = (IP_LOOKUP_NEXT_REWRITE == adj->lookup_next_index);
if (aed->ad_index != INDEX_INVALID)
adj_key = pool_elt_at_index (adj_keys, aed->ad_index);
/* return if there was no stored adj and we will not add one */
if (!adj_key && !save_adj)
return;
/* build kv if a new entry should be stored */
if (save_adj)
{
lcp_adj_mk_key_adj (adj, &kv.k);
kv.v = aed->ad_adj_index;
if (adj_key)
key_changed = (clib_memcmp (adj_key, &kv.k, sizeof (*adj_key)) != 0);
}
/* delete old entry if needed */
if (adj_key && ((save_adj && key_changed) || (!save_adj)))
{
lcp_adj_kv_t old_kv;
clib_memcpy_fast (&old_kv.k, adj_key, sizeof (*adj_key));
old_kv.v = 0;
BV (clib_bihash_add_del) (&lcp_adj_tbl, &old_kv.kv, 0);
if (!save_adj)
{
pool_put (adj_keys, adj_key);
aed->ad_index = INDEX_INVALID;
}
}
/* add new entry if needed */
if (save_adj)
{
BV (clib_bihash_add_del) (&lcp_adj_tbl, &kv.kv, 1);
if (!adj_key)
{
pool_get (adj_keys, adj_key);
aed->ad_index = adj_key - adj_keys;
}
clib_memcpy_fast (adj_key, &kv.k, sizeof (*adj_key));
}
}
static void
lcp_adj_delegate_adj_created (adj_index_t ai)
{
ip_adjacency_t *adj;
lcp_adj_kv_t kv;
index_t lai = INDEX_INVALID;
lcp_adj_key_t *adj_key;
index_t lipi;
lcp_itf_pair_t *lip;
adj = adj_get (ai);
lipi = lcp_itf_pair_find_by_phy (adj->rewrite_header.sw_if_index);
if (lipi == INDEX_INVALID)
return;
lip = lcp_itf_pair_get (lipi);
if (lip->lip_host_type == LCP_ITF_HOST_TUN)
return;
if (IP_LOOKUP_NEXT_REWRITE == adj->lookup_next_index)
{
lcp_adj_mk_key_adj (adj, &kv.k);
pool_get (adj_keys, adj_key);
clib_memcpy_fast (adj_key, &kv.k, sizeof (*adj_key));
kv.v = ai;
BV (clib_bihash_add_del) (&lcp_adj_tbl, &kv.kv, 1);
lai = adj_key - adj_keys;
}
adj_delegate_add (adj, adj_type, lai);
}
u8 *
format_lcp_adj_kvp (u8 *s, va_list *args)
{
BVT (clib_bihash_kv) *kv = va_arg (*args, BVT (clib_bihash_kv) *);
CLIB_UNUSED (int verbose) = va_arg (*args, int);
lcp_adj_kv_t *akv = (lcp_adj_kv_t *) kv;
s = format (s, " %U:%U\n %U", format_vnet_sw_if_index_name,
vnet_get_main (), akv->k.sw_if_index, format_hex_bytes,
akv->k.rewrite, 18, format_adj_nbr, akv->v, 4);
return (s);
}
static clib_error_t *
lcp_adj_show_cmd (vlib_main_t *vm, unformat_input_t *input,
vlib_cli_command_t *cmd)
{
u8 verbose = 0;
if (unformat (input, "verbose"))
verbose = 1;
vlib_cli_output (vm, "linux-cp adjacencies:\n%U", BV (format_bihash),
&lcp_adj_tbl, verbose);
return 0;
}
VLIB_CLI_COMMAND (lcp_itf_pair_show_cmd_node, static) = {
.path = "show lcp adj",
.function = lcp_adj_show_cmd,
.short_help = "show lcp adj",
.is_mp_safe = 1,
};
const adj_delegate_vft_t lcp_adj_vft = {
.adv_format = lcp_adj_delegate_format,
.adv_adj_deleted = lcp_adj_delegate_adj_deleted,
.adv_adj_modified = lcp_adj_delegate_adj_modified,
.adv_adj_created = lcp_adj_delegate_adj_created,
};
static clib_error_t *
lcp_adj_init (vlib_main_t *vm)
{
adj_type = adj_delegate_register_new_type (&lcp_adj_vft);
BV (clib_bihash_init) (&lcp_adj_tbl, "linux-cp adjacencies", 1024, 1 << 24);
BV (clib_bihash_set_kvp_format_fn) (&lcp_adj_tbl, format_lcp_adj_kvp);
return (NULL);
}
VLIB_INIT_FUNCTION (lcp_adj_init);
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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