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Nest: Add trie iteration code to 'show route'

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Add trie iteration code to rt_show_cont() CLI hook and use it to
accelerate 'show route in <addr>' commands using interval queries.
This commit is contained in:
Ondrej Zajicek (work) 2021-12-02 03:30:39 +01:00
parent ea97b89051
commit 9ac16df3d7
2 changed files with 52 additions and 15 deletions
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3
nest/route.h
View file

@ -23,6 +23,7 @@ struct timer;
struct fib;
struct filter;
struct f_trie;
struct f_trie_walk_state;
struct cli;
/*
@ -377,6 +378,7 @@ struct rt_show_data {
struct rt_show_data_rtable *tab; /* Iterator over table list */
struct rt_show_data_rtable *last_table; /* Last table in output */
struct fib_iterator fit; /* Iterator over networks in table */
struct f_trie_walk_state *walk_state; /* Iterator over networks in trie */
int verbose, tables_defined_by;
const struct filter *filter;
struct proto *show_protocol;
@ -387,6 +389,7 @@ struct rt_show_data {
int export_mode, addr_mode, primary_only, filtered, stats;
int table_open; /* Iteration (fit) is open */
int trie_walk; /* Current table is iterated using trie */
int net_counter, rt_counter, show_counter, table_counter;
int net_counter_last, rt_counter_last, show_counter_last;
};

64
nest/rt-show.c
View file

@ -15,6 +15,7 @@
#include "nest/cli.h"
#include "nest/iface.h"
#include "filter/filter.h"
#include "filter/data.h"
#include "sysdep/unix/krt.h"
static void
@ -212,7 +213,7 @@ rt_show_cleanup(struct cli *c)
struct rt_show_data_rtable *tab;
/* Unlink the iterator */
if (d->table_open)
if (d->table_open && !d->trie_walk)
fit_get(&d->tab->table->fib, &d->fit);
/* Unlock referenced tables */
@ -224,12 +225,13 @@ static void
rt_show_cont(struct cli *c)
{
struct rt_show_data *d = c->rover;
struct rtable *tab = d->tab->table;
#ifdef DEBUGGING
unsigned max = 4;
#else
unsigned max = 64;
#endif
struct fib *fib = &d->tab->table->fib;
struct fib *fib = &tab->fib;
struct fib_iterator *it = &d->fit;
if (d->running_on_config && (d->running_on_config != config))
@ -240,7 +242,19 @@ rt_show_cont(struct cli *c)
if (!d->table_open)
{
FIB_ITERATE_INIT(&d->fit, &d->tab->table->fib);
/* We use either trie-based walk or fib-based walk */
d->trie_walk = tab->trie &&
(d->addr_mode == RSD_ADDR_IN) &&
net_val_match(tab->addr_type, NB_IP);
if (d->trie_walk && !d->walk_state)
d->walk_state = lp_allocz(c->parser_pool, sizeof (struct f_trie_walk_state));
if (d->trie_walk)
trie_walk_init(d->walk_state, tab->trie, d->addr);
else
FIB_ITERATE_INIT(&d->fit, &tab->fib);
d->table_open = 1;
d->table_counter++;
d->kernel = rt_show_get_kernel(d);
@ -253,21 +267,41 @@ rt_show_cont(struct cli *c)
rt_show_table(c, d);
}
FIB_ITERATE_START(fib, it, net, n)
if (d->trie_walk)
{
if ((d->addr_mode == RSD_ADDR_IN) && (!net_in_netX(n->n.addr, d->addr)))
goto next;
if (!max--)
/* Trie-based walk */
net_addr addr;
while (trie_walk_next(d->walk_state, &addr))
{
FIB_ITERATE_PUT(it);
return;
}
rt_show_net(c, n, d);
net *n = net_find(tab, &addr);
if (!n)
continue;
next:;
rt_show_net(c, n, d);
if (!--max)
return;
}
}
else
{
/* fib-based walk */
FIB_ITERATE_START(fib, it, net, n)
{
if ((d->addr_mode == RSD_ADDR_IN) && (!net_in_netX(n->n.addr, d->addr)))
goto next;
if (!max--)
{
FIB_ITERATE_PUT(it);
return;
}
rt_show_net(c, n, d);
next:;
}
FIB_ITERATE_END;
}
FIB_ITERATE_END;
if (d->stats)
{
@ -276,7 +310,7 @@ rt_show_cont(struct cli *c)
cli_printf(c, -1007, "%d of %d routes for %d networks in table %s",
d->show_counter - d->show_counter_last, d->rt_counter - d->rt_counter_last,
d->net_counter - d->net_counter_last, d->tab->table->name);
d->net_counter - d->net_counter_last, tab->name);
}
d->kernel = NULL;