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Nest: Attach prefix trie to rtable for faster LPM and interval queries

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Attach a prefix trie to IP/VPN/ROA tables. Use it for net_route() and
net_roa_check(). This leads to 3-5x speedups for IPv4 and 5-10x
speedup for IPv6 of these calls.

TODO:
 - Rebuild the trie during rt_prune_table()
 - Better way to avoid trie_add_prefix() in net_get() for existing tables
 - Make it configurable (?)
This commit is contained in:
Ondrej Zajicek (work)
2021-11-29 19:23:42 +01:00
parent 78ddfd2600
commit 836a87b8ac
5 changed files with 281 additions and 47 deletions
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9
nest/route.h
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@ -20,7 +20,9 @@ struct proto;
struct rte_src;
struct symbol;
struct timer;
struct fib;
struct filter;
struct f_trie;
struct cli;
/*
@ -49,7 +51,7 @@ struct fib_iterator { /* See lib/slists.h for an explanation */
uint hash;
};
typedef void (*fib_init_fn)(void *);
typedef void (*fib_init_fn)(struct fib *, void *);
struct fib {
pool *fib_pool; /* Pool holding all our data */
@ -149,6 +151,7 @@ struct rtable_config {
int gc_min_time; /* Minimum time between two consecutive GC runs */
byte sorted; /* Routes of network are sorted according to rte_better() */
byte internal; /* Internal table of a protocol */
byte trie_used; /* Rtable has attached trie */
btime min_settle_time; /* Minimum settle time for notifications */
btime max_settle_time; /* Maximum settle time for notifications */
};
@ -158,6 +161,7 @@ typedef struct rtable {
node n; /* Node in list of all tables */
pool *rp; /* Resource pool to allocate everything from, including itself */
struct fib fib;
struct f_trie *trie; /* Trie of prefixes defined in fib */
char *name; /* Name of this table */
list channels; /* List of attached channels (struct channel) */
uint addr_type; /* Type of address data stored in table (NET_*) */
@ -324,7 +328,8 @@ static inline net *net_find(rtable *tab, const net_addr *addr) { return (net *)
static inline net *net_find_valid(rtable *tab, const net_addr *addr)
{ net *n = net_find(tab, addr); return (n && rte_is_valid(n->routes)) ? n : NULL; }
static inline net *net_get(rtable *tab, const net_addr *addr) { return (net *) fib_get(&tab->fib, addr); }
void *net_route(rtable *tab, const net_addr *n);
net *net_get(rtable *tab, const net_addr *addr);
net *net_route(rtable *tab, const net_addr *n);
int net_roa_check(rtable *tab, const net_addr *n, u32 asn);
rte *rte_find(net *net, struct rte_src *src);
rte *rte_get_temp(struct rta *);