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/*
*------------------------------------------------------------------
* ip_path_mtu.h
*
* Copyright (c) 2021 Graphiant.
* 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/ip/ip.h>
/**
* @brief
* The Path MTU DPO. interposed in the forwarding chain of the host prefix.
*/
typedef struct ip_pmtu_dpo_t_
{
/**
* The protocol of packets using this DPO
*/
dpo_proto_t ipm_proto;
u8 __pad8;
/**
* Configured Path Mtu
*/
u16 ipm_pmtu;
/**
* number of locks.
*/
u16 ipm_locks;
/**
* Stacked DPO
*/
dpo_id_t ipm_dpo;
} ip_pmtu_dpo_t;
/*
* PMTU DPOs are accessed in the data-path so they should not straddle a cache
* line. Align to a integer factor of a cacheline
*/
STATIC_ASSERT_SIZEOF (ip_pmtu_dpo_t, 2 * sizeof (u64));
#define foreach_ip_pmtu_flag \
_ (ATTACHED, 0, "attached") \
_ (REMOTE, 1, "remote") \
_ (STALE, 2, "stale")
typedef enum ip_pmtu_flags_t_
{
#define _(a, b, c) IP_PMTU_FLAG_##a = (1 << b),
foreach_ip_pmtu_flag
#undef _
} ip_pmtu_flags_t;
/**
* Remote Path MTU tracking object
*/
typedef struct ip_pmtu_t_
{
/** linkage into the FIB graph */
fib_node_t ipt_node;
/** Track fib entry */
fib_node_index_t ipt_fib_entry;
u32 ipt_sibling;
ip_pmtu_flags_t ipt_flags;
/** Configured MTU */
u16 ipt_cfg_pmtu;
/** MTU from the parent MTU */
u16 ipt_parent_pmtu;
/** operational MTU; the minimum value of the cfg and parent MTU */
u16 ipt_oper_pmtu;
} ip_pmtu_t;
extern int ip_path_mtu_update (const ip_address_t *nh, u32 table_id, u16 pmtu);
typedef walk_rc_t (*ip_path_mtu_walk_t) (index_t ipti, void *ctx);
extern void ip_path_mtu_walk (ip_path_mtu_walk_t fn, void *ctx);
extern int ip_path_mtu_replace_begin (void);
extern int ip_path_mtu_replace_end (void);
extern u32 ip_pmtu_get_table_id (const ip_pmtu_t *ipt);
extern void ip_pmtu_get_ip (const ip_pmtu_t *ipt, ip_address_t *ip);
extern void ip_pmtu_dpo_add_or_lock (u16 pmtu, const dpo_id_t *parent,
dpo_id_t *dpo);
/**
* Data-plane accessor functions
*/
extern ip_pmtu_dpo_t *ip_pmtu_dpo_pool;
static_always_inline ip_pmtu_dpo_t *
ip_pmtu_dpo_get (index_t index)
{
return (pool_elt_at_index (ip_pmtu_dpo_pool, index));
}
extern ip_pmtu_t *ip_pmtu_pool;
static_always_inline ip_pmtu_t *
ip_path_mtu_get (index_t index)
{
return (pool_elt_at_index (ip_pmtu_pool, index));
}
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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