path: root/sys/netinet6/in6_fib.h
diff options
authorAlexander V. Chernikov <melifaro@FreeBSD.org>2020-12-25 10:39:52 +0000
committerAlexander V. Chernikov <melifaro@FreeBSD.org>2020-12-25 11:33:17 +0000
commitf5baf8bb12f39d0e8d64508c47eb6c4386ef716d (patch)
tree0d15a6734d10c26415349a57b81d76a4332e2950 /sys/netinet6/in6_fib.h
parent760dbe84abfb0b3aa9b72f7474fb9a066bbdd0cf (diff)
Add modular fib lookup framework.
This change introduces framework that allows to dynamically attach or detach longest prefix match (lpm) lookup algorithms to speed up datapath route tables lookups. Framework takes care of handling initial synchronisation, route subscription, nhop/nhop groups reference and indexing, dataplane attachments and fib instance algorithm setup/teardown. Framework features automatic algorithm selection, allowing for picking the best matching algorithm on-the-fly based on the amount of routes in the routing table. Currently framework code is guarded under FIB_ALGO config option. An idea is to enable it by default in the next couple of weeks. The following algorithms are provided by default: IPv4: * bsearch4 (lockless binary search in a special IP array), tailored for small-fib (<16 routes) * radix4_lockless (lockless immutable radix, re-created on every rtable change), tailored for small-fib (<1000 routes) * radix4 (base system radix backend) * dpdk_lpm4 (DPDK DIR24-8-based lookups), lockless datastrucure, optimized for large-fib (D27412) IPv6: * radix6_lockless (lockless immutable radix, re-created on every rtable change), tailed for small-fib (<1000 routes) * radix6 (base system radix backend) * dpdk_lpm6 (DPDK DIR24-8-based lookups), lockless datastrucure, optimized for large-fib (D27412) Performance changes: Micro benchmarks (I7-7660U, single-core lookups, 2048k dst, code in D27604): IPv4: 8 routes: radix4: ~20mpps radix4_lockless: ~24.8mpps bsearch4: ~69mpps dpdk_lpm4: ~67 mpps 700k routes: radix4_lockless: 3.3mpps dpdk_lpm4: 46mpps IPv6: 8 routes: radix6_lockless: ~20mpps dpdk_lpm6: ~70mpps 100k routes: radix6_lockless: 13.9mpps dpdk_lpm6: 57mpps Forwarding benchmarks: + 10-15% IPv4 forwarding performance (small-fib, bsearch4) + 25% IPv4 forwarding performance (full-view, dpdk_lpm4) + 20% IPv6 forwarding performance (full-view, dpdk_lpm6) Control: Framwork adds the following runtime sysctls: List algos * net.route.algo.inet.algo_list: bsearch4, radix4_lockless, radix4 * net.route.algo.inet6.algo_list: radix6_lockless, radix6, dpdk_lpm6 Debug level (7=LOG_DEBUG, per-route) net.route.algo.debug_level: 5 Algo selection (currently only for fib 0): net.route.algo.inet.algo: bsearch4 net.route.algo.inet6.algo: radix6_lockless Support for manually changing algos in non-default fib will be added soon. Some sysctl names will be changed in the near future. Differential Revision: https://reviews.freebsd.org/D27401
Diffstat (limited to 'sys/netinet6/in6_fib.h')
1 files changed, 2 insertions, 0 deletions
diff --git a/sys/netinet6/in6_fib.h b/sys/netinet6/in6_fib.h
index 2b260811ca36..26a7d833dd7e 100644
--- a/sys/netinet6/in6_fib.h
+++ b/sys/netinet6/in6_fib.h
@@ -44,6 +44,8 @@ struct rtentry *fib6_lookup_rt(uint32_t fibnum, const struct in6_addr *dst6,
uint32_t scopeid, uint32_t flags, struct route_nhop_data *rnd);
struct nhop_object *fib6_lookup_debugnet(uint32_t fibnum,
const struct in6_addr *dst6, uint32_t scopeid, uint32_t flags);
+struct nhop_object *fib6_radix_lookup_nh(uint32_t fibnum,
+ const struct in6_addr *dst6, uint32_t scopeid);
uint32_t fib6_calc_software_hash(const struct in6_addr *src,
const struct in6_addr *dst, unsigned short src_port, unsigned short dst_port,
char proto, uint32_t *phashtype);