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inet: call inet6_ehashfn() once from inet6_hash_connect()

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inet6_ehashfn() being called from __inet6_check_established()
has a big impact on performance, as shown in the Tested section.

After prior patch, we can compute the hash for port 0
from inet6_hash_connect(), and derive each hash in
__inet_hash_connect() from this initial hash:

hash(saddr, lport, daddr, dport) == hash(saddr, 0, daddr, dport) + lport

Apply the same principle for __inet_check_established(),
although inet_ehashfn() has a smaller cost.

Tested:

Server: ulimit -n 40000; neper/tcp_crr -T 200 -F 30000 -6 --nolog
Client: ulimit -n 40000; neper/tcp_crr -T 200 -F 30000 -6 --nolog -c -H server

Before this patch:

  utime_start=0.286131
  utime_end=4.378886
  stime_start=11.952556
  stime_end=1991.655533
  num_transactions=1446830
  latency_min=0.001061085
  latency_max=12.075275028
  latency_mean=0.376375302
  latency_stddev=1.361969596
  num_samples=306383
  throughput=151866.56

perf top:

 50.01%  [kernel]       [k] __inet6_check_established
 20.65%  [kernel]       [k] __inet_hash_connect
 15.81%  [kernel]       [k] inet6_ehashfn
  2.92%  [kernel]       [k] rcu_all_qs
  2.34%  [kernel]       [k] __cond_resched
  0.50%  [kernel]       [k] _raw_spin_lock
  0.34%  [kernel]       [k] sched_balance_trigger
  0.24%  [kernel]       [k] queued_spin_lock_slowpath

After this patch:

  utime_start=0.315047
  utime_end=9.257617
  stime_start=7.041489
  stime_end=1923.688387
  num_transactions=3057968
  latency_min=0.003041375
  latency_max=7.056589232
  latency_mean=0.141075048    # Better latency metrics
  latency_stddev=0.526900516
  num_samples=312996
  throughput=320677.21        # 111 % increase, and 229 % for the series

perf top: inet6_ehashfn is no longer seen.

 39.67%  [kernel]       [k] __inet_hash_connect
 37.06%  [kernel]       [k] __inet6_check_established
  4.79%  [kernel]       [k] rcu_all_qs
  3.82%  [kernel]       [k] __cond_resched
  1.76%  [kernel]       [k] sched_balance_domains
  0.82%  [kernel]       [k] _raw_spin_lock
  0.81%  [kernel]       [k] sched_balance_rq
  0.81%  [kernel]       [k] sched_balance_trigger
  0.76%  [kernel]       [k] queued_spin_lock_slowpath

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Tested-by: Jason Xing <kerneljasonxing@gmail.com>
Reviewed-by: Jason Xing <kerneljasonxing@gmail.com>
Link: https://patch.msgid.link/20250305034550.879255-3-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2025-03-05 03:45:50 +00:00 committed by Jakub Kicinski
parent 9544d60a26
commit d4438ce68b
4 changed files with 33 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/net/inet_hashtables.h
View File

@ -527,10 +527,12 @@ static inline void sk_rcv_saddr_set(struct sock *sk, __be32 addr)
int __inet_hash_connect(struct inet_timewait_death_row *death_row,
struct sock *sk, u64 port_offset,
u32 hash_port0,
int (*check_established)(struct inet_timewait_death_row *,
struct sock *, __u16,
struct inet_timewait_sock **,
bool rcu_lookup));
bool rcu_lookup,
u32 hash));
int inet_hash_connect(struct inet_timewait_death_row *death_row,
struct sock *sk);

2
include/net/ip.h
View File

@ -357,7 +357,7 @@ static inline void inet_get_local_port_range(const struct net *net, int *low, in
bool inet_sk_get_local_port_range(const struct sock *sk, int *low, int *high);
#ifdef CONFIG_SYSCTL
static inline bool inet_is_local_reserved_port(struct net *net, unsigned short port)
static inline bool inet_is_local_reserved_port(const struct net *net, unsigned short port)
{
if (!net->ipv4.sysctl_local_reserved_ports)
return false;

26
net/ipv4/inet_hashtables.c
View File

@ -538,7 +538,8 @@ EXPORT_SYMBOL_GPL(__inet_lookup_established);
static int __inet_check_established(struct inet_timewait_death_row *death_row,
struct sock *sk, __u16 lport,
struct inet_timewait_sock **twp,
bool rcu_lookup)
bool rcu_lookup,
u32 hash)
{
struct inet_hashinfo *hinfo = death_row->hashinfo;
struct inet_sock *inet = inet_sk(sk);
@ -549,8 +550,6 @@ static int __inet_check_established(struct inet_timewait_death_row *death_row,
int sdif = l3mdev_master_ifindex_by_index(net, dif);
INET_ADDR_COOKIE(acookie, saddr, daddr);
const __portpair ports = INET_COMBINED_PORTS(inet->inet_dport, lport);
unsigned int hash = inet_ehashfn(net, daddr, lport,
saddr, inet->inet_dport);
struct inet_ehash_bucket *head = inet_ehash_bucket(hinfo, hash);
struct inet_timewait_sock *tw = NULL;
const struct hlist_nulls_node *node;
@ -1007,9 +1006,10 @@ static u32 *table_perturb;
int __inet_hash_connect(struct inet_timewait_death_row *death_row,
struct sock *sk, u64 port_offset,
u32 hash_port0,
int (*check_established)(struct inet_timewait_death_row *,
struct sock *, __u16, struct inet_timewait_sock **,
bool rcu_lookup))
bool rcu_lookup, u32 hash))
{
struct inet_hashinfo *hinfo = death_row->hashinfo;
struct inet_bind_hashbucket *head, *head2;
@ -1027,7 +1027,8 @@ int __inet_hash_connect(struct inet_timewait_death_row *death_row,
if (port) {
local_bh_disable();
ret = check_established(death_row, sk, port, NULL, false);
ret = check_established(death_row, sk, port, NULL, false,
hash_port0 + port);
local_bh_enable();
return ret;
}
@ -1071,7 +1072,8 @@ other_parity_scan:
rcu_read_unlock();
goto next_port;
}
if (!check_established(death_row, sk, port, &tw, true))
if (!check_established(death_row, sk, port, &tw, true,
hash_port0 + port))
break;
rcu_read_unlock();
goto next_port;
@ -1090,7 +1092,8 @@ other_parity_scan:
goto next_port_unlock;
WARN_ON(hlist_empty(&tb->bhash2));
if (!check_established(death_row, sk,
port, &tw, false))
port, &tw, false,
hash_port0 + port))
goto ok;
goto next_port_unlock;
}
@ -1197,11 +1200,18 @@ error:
int inet_hash_connect(struct inet_timewait_death_row *death_row,
struct sock *sk)
{
const struct inet_sock *inet = inet_sk(sk);
const struct net *net = sock_net(sk);
u64 port_offset = 0;
u32 hash_port0;
if (!inet_sk(sk)->inet_num)
port_offset = inet_sk_port_offset(sk);
return __inet_hash_connect(death_row, sk, port_offset,
hash_port0 = inet_ehashfn(net, inet->inet_rcv_saddr, 0,
inet->inet_daddr, inet->inet_dport);
return __inet_hash_connect(death_row, sk, port_offset, hash_port0,
__inet_check_established);
}
EXPORT_SYMBOL_GPL(inet_hash_connect);

15
net/ipv6/inet6_hashtables.c
View File

@ -264,7 +264,8 @@ EXPORT_SYMBOL_GPL(inet6_lookup);
static int __inet6_check_established(struct inet_timewait_death_row *death_row,
struct sock *sk, const __u16 lport,
struct inet_timewait_sock **twp,
bool rcu_lookup)
bool rcu_lookup,
u32 hash)
{
struct inet_hashinfo *hinfo = death_row->hashinfo;
struct inet_sock *inet = inet_sk(sk);
@ -274,8 +275,6 @@ static int __inet6_check_established(struct inet_timewait_death_row *death_row,
struct net *net = sock_net(sk);
const int sdif = l3mdev_master_ifindex_by_index(net, dif);
const __portpair ports = INET_COMBINED_PORTS(inet->inet_dport, lport);
const unsigned int hash = inet6_ehashfn(net, daddr, lport, saddr,
inet->inet_dport);
struct inet_ehash_bucket *head = inet_ehash_bucket(hinfo, hash);
struct inet_timewait_sock *tw = NULL;
const struct hlist_nulls_node *node;
@ -354,11 +353,19 @@ static u64 inet6_sk_port_offset(const struct sock *sk)
int inet6_hash_connect(struct inet_timewait_death_row *death_row,
struct sock *sk)
{
const struct in6_addr *daddr = &sk->sk_v6_rcv_saddr;
const struct in6_addr *saddr = &sk->sk_v6_daddr;
const struct inet_sock *inet = inet_sk(sk);
const struct net *net = sock_net(sk);
u64 port_offset = 0;
u32 hash_port0;
if (!inet_sk(sk)->inet_num)
port_offset = inet6_sk_port_offset(sk);
return __inet_hash_connect(death_row, sk, port_offset,
hash_port0 = inet6_ehashfn(net, daddr, 0, saddr, inet->inet_dport);
return __inet_hash_connect(death_row, sk, port_offset, hash_port0,
__inet6_check_established);
}
EXPORT_SYMBOL_GPL(inet6_hash_connect);