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Add fib lookup testing module.

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This module intended to measure performance of routing lookups.

Uses a list of IP addresses specified by sysctl one-by-one.
Performance testing is triggered by changing sysctl OID with a number of lookups to execute.
Lookups are done by the chunks of 10K routes, entering/exiting epoch on
 chunk granularity to amortise cost.

Example:
make -C sys/modules/test/fib_lookup unload load
for i in `cat ~/ip4.txt`; do sysctl net.route.test.add_inet_addr=$i; done
for i in `cat ~/ip6.txt`; do sysctl net.route.test.add_inet6_addr=$i; done

sysctl net.route.test.run_inet=10000000

dmesg | tail

Dec 13 23:24:05 current kernel: 10000000 packets in 417240173 nanoseconds, 23967011 pps
Dec 13 23:24:06 current kernel: run: 10000000 packets vnet 0xfffff80003073f00
Dec 13 23:24:07 current kernel: 10000000 packets in 423086254 nanoseconds, 23635842 pps

Differential Revision: https://reviews.freebsd.org/D27604
This commit is contained in:
Alexander V. Chernikov 2021-01-09 12:55:04 +00:00
parent 537d134373
commit 0433870efe
2 changed files with 548 additions and 0 deletions
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11
sys/modules/tests/fib_lookup/Makefile Normal file
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# $FreeBSD$
SYSDIR?=${SRCTOP}/sys
.include "${SYSDIR}/conf/kern.opts.mk"
.PATH: ${SYSDIR}/tests/fib_lookup
KMOD= test_lookup
SRCS= opt_inet.h opt_inet6.h fib_lookup.c
.include <bsd.kmod.mk>

537
sys/tests/fib_lookup/fib_lookup.c Normal file
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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2020 Alexander V. Chernikov
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_inet.h"
#include "opt_inet6.h"
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/rmlock.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <net/vnet.h>
#include <net/if.h>
#include <net/if_var.h>
#include <netinet/in.h>
#include <netinet/in_fib.h>
#include <netinet/ip.h>
#include <netinet6/in6_fib.h>
#include <net/route.h>
#include <net/route/nhop.h>
#include <net/route/route_ctl.h>
#include <net/route/route_var.h>
#include <net/route/fib_algo.h>
#define CHUNK_SIZE 10000
VNET_DEFINE_STATIC(struct in_addr *, inet_addr_list);
#define V_inet_addr_list VNET(inet_addr_list)
VNET_DEFINE_STATIC(int, inet_list_size);
#define V_inet_list_size VNET(inet_list_size)
VNET_DEFINE_STATIC(struct in6_addr *, inet6_addr_list);
#define V_inet6_addr_list VNET(inet6_addr_list)
VNET_DEFINE_STATIC(int, inet6_list_size);
#define V_inet6_list_size VNET(inet6_list_size)
SYSCTL_DECL(_net_route);
SYSCTL_NODE(_net_route, OID_AUTO, test, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
"Route algorithm lookups");
static int
add_addr(int family, char *addr_str)
{
if (family == AF_INET) {
struct in_addr *paddr_old = V_inet_addr_list;
int size_old = V_inet_list_size;
struct in_addr addr;
if (inet_pton(AF_INET, addr_str, &addr) != 1)
return (EINVAL);
struct in_addr *paddr = mallocarray(size_old + 1,
sizeof(struct in_addr), M_TEMP, M_ZERO | M_WAITOK);
if (paddr_old != NULL) {
memcpy(paddr, paddr_old, size_old * sizeof(struct in_addr));
free(paddr_old, M_TEMP);
}
paddr[size_old] = addr;
V_inet_addr_list = paddr;
V_inet_list_size = size_old + 1;
inet_ntop(AF_INET, &addr, addr_str, sizeof(addr_str));
} else if (family == AF_INET6) {
struct in6_addr *paddr_old = V_inet6_addr_list;
int size_old = V_inet6_list_size;
struct in6_addr addr6;
if (inet_pton(AF_INET6, addr_str, &addr6) != 1)
return (EINVAL);
struct in6_addr *paddr = mallocarray(size_old + 1,
sizeof(struct in6_addr), M_TEMP, M_ZERO | M_WAITOK);
if (paddr_old != NULL) {
memcpy(paddr, paddr_old, size_old * sizeof(struct in6_addr));
free(paddr_old, M_TEMP);
}
paddr[size_old] = addr6;
V_inet6_addr_list = paddr;
V_inet6_list_size = size_old + 1;
inet_ntop(AF_INET6, &addr6, addr_str, sizeof(addr_str));
}
return (0);
}
static int
add_addr_sysctl_handler(struct sysctl_oid *oidp, struct sysctl_req *req, int family)
{
char addr_str[INET6_ADDRSTRLEN];
int error;
bzero(addr_str, sizeof(addr_str));
error = sysctl_handle_string(oidp, addr_str, sizeof(addr_str), req);
if (error != 0 || req->newptr == NULL)
return (error);
error = add_addr(family, addr_str);
return (0);
}
static int
add_inet_addr_sysctl_handler(SYSCTL_HANDLER_ARGS)
{
return (add_addr_sysctl_handler(oidp, req, AF_INET));
}
SYSCTL_PROC(_net_route_test, OID_AUTO, add_inet_addr,
CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_MPSAFE, NULL, 0,
add_inet_addr_sysctl_handler, "A", "Set");
static int
add_inet6_addr_sysctl_handler(SYSCTL_HANDLER_ARGS)
{
return (add_addr_sysctl_handler(oidp, req, AF_INET6));
}
SYSCTL_PROC(_net_route_test, OID_AUTO, add_inet6_addr,
CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_MPSAFE, NULL, 0,
add_inet6_addr_sysctl_handler, "A", "Set");
static uint64_t
run_test_inet_one_pass()
{
/* Assume epoch */
int sz = V_inet_list_size;
int tries = CHUNK_SIZE / sz;
const struct in_addr *a = V_inet_addr_list;
uint64_t count = 0;
for (int pass = 0; pass < tries; pass++) {
for (int i = 0; i < sz; i++) {
fib4_lookup(RT_DEFAULT_FIB, a[i], 0, NHR_NONE, 0);
count++;
}
}
return (count);
}
static int
run_test_inet(SYSCTL_HANDLER_ARGS)
{
struct epoch_tracker et;
int count = 0;
int error = sysctl_handle_int(oidp, &count, 0, req);
if (error != 0)
return (error);
if (count == 0)
return (0);
if (V_inet_list_size <= 0)
return (ENOENT);
printf("run: %d packets vnet %p\n", count, curvnet);
if (count < CHUNK_SIZE)
count = CHUNK_SIZE;
struct timespec ts_pre, ts_post;
int64_t pass_diff, total_diff = 0;
uint64_t pass_packets, total_packets = 0;
for (int pass = 0; pass < count / CHUNK_SIZE; pass++) {
NET_EPOCH_ENTER(et);
nanouptime(&ts_pre);
pass_packets = run_test_inet_one_pass();
nanouptime(&ts_post);
NET_EPOCH_EXIT(et);
pass_diff = (ts_post.tv_sec - ts_pre.tv_sec) * 1000000000 +
(ts_post.tv_nsec - ts_pre.tv_nsec);
total_diff += pass_diff;
total_packets += pass_packets;
}
printf("%zu packets in %zu nanoseconds, %zu pps\n",
total_packets, total_diff, total_packets * 1000000000 / total_diff);
return (0);
}
SYSCTL_PROC(_net_route_test, OID_AUTO, run_inet,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
0, 0, run_test_inet, "I", "Execute fib4_lookup test");
static uint64_t
run_test_inet6_one_pass()
{
/* Assume epoch */
int sz = V_inet6_list_size;
int tries = CHUNK_SIZE / sz;
const struct in6_addr *a = V_inet6_addr_list;
uint64_t count = 0;
for (int pass = 0; pass < tries; pass++) {
for (int i = 0; i < sz; i++) {
fib6_lookup(RT_DEFAULT_FIB, &a[i], 0, NHR_NONE, 0);
count++;
}
}
return (count);
}
static int
run_test_inet6(SYSCTL_HANDLER_ARGS)
{
struct epoch_tracker et;
int count = 0;
int error = sysctl_handle_int(oidp, &count, 0, req);
if (error != 0)
return (error);
if (count == 0)
return (0);
if (V_inet6_list_size <= 0)
return (ENOENT);
printf("run: %d packets vnet %p\n", count, curvnet);
if (count < CHUNK_SIZE)
count = CHUNK_SIZE;
struct timespec ts_pre, ts_post;
int64_t pass_diff, total_diff = 0;
uint64_t pass_packets, total_packets = 0;
for (int pass = 0; pass < count / CHUNK_SIZE; pass++) {
NET_EPOCH_ENTER(et);
nanouptime(&ts_pre);
pass_packets = run_test_inet6_one_pass();
nanouptime(&ts_post);
NET_EPOCH_EXIT(et);
pass_diff = (ts_post.tv_sec - ts_pre.tv_sec) * 1000000000 +
(ts_post.tv_nsec - ts_pre.tv_nsec);
total_diff += pass_diff;
total_packets += pass_packets;
}
printf("%zu packets in %zu nanoseconds, %zu pps\n",
total_packets, total_diff, total_packets * 1000000000 / total_diff);
return (0);
}
SYSCTL_PROC(_net_route_test, OID_AUTO, run_inet6,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
0, 0, run_test_inet6, "I", "Execute fib6_lookup test");
static bool
cmp_dst(uint32_t fibnum, struct in_addr a)
{
struct nhop_object *nh_fib;
struct rtentry *rt;
struct route_nhop_data rnd = {};
nh_fib = fib4_lookup(fibnum, a, 0, NHR_NONE, 0);
rt = fib4_lookup_rt(fibnum, a, 0, NHR_NONE, &rnd);
if (nh_fib == NULL && rt == NULL) {
return (true);
} else if (nh_fib == nhop_select(rnd.rnd_nhop, 0)) {
return (true);
}
struct in_addr dst;
int plen;
uint32_t scopeid;
char key_str[INET_ADDRSTRLEN], dst_str[INET_ADDRSTRLEN];
inet_ntop(AF_INET, &a, key_str, sizeof(key_str));
if (rnd.rnd_nhop == NULL) {
printf("[RT BUG] lookup for %s: RIB: ENOENT FIB: nh=%u\n",
key_str, nhop_get_idx(nh_fib));
} else {
rt_get_inet_prefix_plen(rt, &dst, &plen, &scopeid);
inet_ntop(AF_INET, &dst, dst_str, sizeof(dst_str));
printf("[RT BUG] lookup for %s: RIB: %s/%d,nh=%u FIB: nh=%u\n",
key_str, dst_str, plen,
nhop_get_idx(nhop_select(rnd.rnd_nhop, 0)),
nhop_get_idx(nh_fib));
}
return (false);
}
/* Random lookups: correctness verification */
static uint64_t
run_test_inet_one_pass_random()
{
/* Assume epoch */
struct in_addr a[64];
int sz = 64;
uint64_t count = 0;
for (int pass = 0; pass < CHUNK_SIZE / sz; pass++) {
arc4random_buf(a, sizeof(a));
for (int i = 0; i < sz; i++) {
if (!cmp_dst(RT_DEFAULT_FIB, a[i]))
return (0);
count++;
}
}
return (count);
}
static int
run_test_inet_random(SYSCTL_HANDLER_ARGS)
{
struct epoch_tracker et;
int count = 0;
int error = sysctl_handle_int(oidp, &count, 0, req);
if (error != 0)
return (error);
if (count == 0)
return (0);
if (count < CHUNK_SIZE)
count = CHUNK_SIZE;
struct timespec ts_pre, ts_post;
int64_t pass_diff, total_diff = 1;
uint64_t pass_packets, total_packets = 0;
for (int pass = 0; pass < count / CHUNK_SIZE; pass++) {
NET_EPOCH_ENTER(et);
nanouptime(&ts_pre);
pass_packets = run_test_inet_one_pass_random();
nanouptime(&ts_post);
NET_EPOCH_EXIT(et);
pass_diff = (ts_post.tv_sec - ts_pre.tv_sec) * 1000000000 +
(ts_post.tv_nsec - ts_pre.tv_nsec);
total_diff += pass_diff;
total_packets += pass_packets;
if (pass_packets == 0)
break;
}
/* Signal error to userland */
if (pass_packets == 0)
return (EINVAL);
printf("%zu packets in %zu nanoseconds, %zu pps\n",
total_packets, total_diff, total_packets * 1000000000 / total_diff);
return (0);
}
SYSCTL_PROC(_net_route_test, OID_AUTO, run_inet_random,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
0, 0, run_test_inet_random, "I", "Execute fib4_lookup random check tests");
struct inet_array {
uint32_t alloc_items;
uint32_t num_items;
struct in_addr *arr;
int error;
};
/*
* For each prefix, add the following records to the lookup array:
* * prefix-1, prefix, prefix + 1, prefix_end, prefix_end + 1
*/
static int
add_prefix(struct rtentry *rt, void *_data)
{
struct inet_array *pa = (struct inet_array *)_data;
struct in_addr addr;
int plen;
uint32_t scopeid, haddr;
if (pa->num_items + 5 >= pa->alloc_items) {
if (pa->error == 0)
pa->error = EINVAL;
return (0);
}
rt_get_inet_prefix_plen(rt, &addr, &plen, &scopeid);
pa->arr[pa->num_items++] = addr;
haddr = ntohl(addr.s_addr);
if (haddr > 0) {
pa->arr[pa->num_items++].s_addr = htonl(haddr - 1);
pa->arr[pa->num_items++].s_addr = htonl(haddr + 1);
/* assume mask != 0 */
uint32_t mlen = (1 << (32 - plen)) - 1;
pa->arr[pa->num_items++].s_addr = htonl(haddr + mlen);
/* can overflow, but who cares */
pa->arr[pa->num_items++].s_addr = htonl(haddr + mlen + 1);
}
return (0);
}
static bool
prepare_list(uint32_t fibnum, struct inet_array *pa)
{
struct rib_head *rh;
rh = rt_tables_get_rnh(fibnum, AF_INET);
uint32_t num_prefixes = (rh->rnh_prefixes + 10) * 5;
bzero(pa, sizeof(struct inet_array));
pa->alloc_items = num_prefixes;
pa->arr = mallocarray(num_prefixes, sizeof(struct in_addr),
M_TEMP, M_ZERO | M_WAITOK);
rib_walk(RT_DEFAULT_FIB, AF_INET, false, add_prefix, pa);
return (pa->error == 0);
}
static int
run_test_inet_scan(SYSCTL_HANDLER_ARGS)
{
struct epoch_tracker et;
int count = 0;
int error = sysctl_handle_int(oidp, &count, 0, req);
if (error != 0)
return (error);
if (count == 0)
return (0);
struct inet_array pa = {};
if (!prepare_list(RT_DEFAULT_FIB, &pa))
return (pa.error);
struct timespec ts_pre, ts_post;
int64_t total_diff = 1;
uint64_t total_packets = 0;
NET_EPOCH_ENTER(et);
nanouptime(&ts_pre);
for (int i = 0; i < pa.num_items; i++) {
if (!cmp_dst(RT_DEFAULT_FIB, pa.arr[i])) {
error = EINVAL;
break;
}
total_packets++;
}
nanouptime(&ts_post);
NET_EPOCH_EXIT(et);
if (pa.arr != NULL)
free(pa.arr, M_TEMP);
/* Signal error to userland */
if (error != 0)
return (error);
total_diff = (ts_post.tv_sec - ts_pre.tv_sec) * 1000000000 +
(ts_post.tv_nsec - ts_pre.tv_nsec);
printf("%zu packets in %zu nanoseconds, %zu pps\n",
total_packets, total_diff, total_packets * 1000000000 / total_diff);
return (0);
}
SYSCTL_PROC(_net_route_test, OID_AUTO, run_inet_scan,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
0, 0, run_test_inet_scan, "I", "Execute fib4_lookup scan tests");
static int
test_fib_lookup_modevent(module_t mod, int type, void *unused)
{
int error = 0;
switch (type) {
case MOD_LOAD:
break;
case MOD_UNLOAD:
if (V_inet_addr_list != NULL)
free(V_inet_addr_list, M_TEMP);
if (V_inet6_addr_list != NULL)
free(V_inet6_addr_list, M_TEMP);
break;
default:
error = EOPNOTSUPP;
break;
}
return (error);
}
static moduledata_t testfiblookupmod = {
"test_fib_lookup",
test_fib_lookup_modevent,
0
};
DECLARE_MODULE(testfiblookupmod, testfiblookupmod, SI_SUB_PSEUDO, SI_ORDER_ANY);
MODULE_VERSION(testfiblookup, 1);