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authorCraig Gallek <kraig@google.com>2016-02-10 17:50:40 +0100
committerDavid S. Miller <davem@davemloft.net>2016-02-11 09:54:15 +0100
commitc125e80b88687b25b321795457309eaaee4bf270 (patch)
treed61eb6c67a62046691c8f354c0fad948ef298f99 /net/ipv6/inet6_hashtables.c
parentsoreuseport: Prep for fast reuseport TCP socket selection (diff)
downloadlinux-c125e80b88687b25b321795457309eaaee4bf270.tar.xz
linux-c125e80b88687b25b321795457309eaaee4bf270.zip
soreuseport: fast reuseport TCP socket selection
This change extends the fast SO_REUSEPORT socket lookup implemented for UDP to TCP. Listener sockets with SO_REUSEPORT and the same receive address are additionally added to an array for faster random access. This means that only a single socket from the group must be found in the listener list before any socket in the group can be used to receive a packet. Previously, every socket in the group needed to be considered before handing off the incoming packet. This feature also exposes the ability to use a BPF program when selecting a socket from a reuseport group. Signed-off-by: Craig Gallek <kraig@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/inet6_hashtables.c')
-rw-r--r--net/ipv6/inet6_hashtables.c16
1 files changed, 15 insertions, 1 deletions
diff --git a/net/ipv6/inet6_hashtables.c b/net/ipv6/inet6_hashtables.c
index 004345d26808..70f2628be6fa 100644
--- a/net/ipv6/inet6_hashtables.c
+++ b/net/ipv6/inet6_hashtables.c
@@ -17,11 +17,13 @@
#include <linux/module.h>
#include <linux/random.h>
+#include <net/addrconf.h>
#include <net/inet_connection_sock.h>
#include <net/inet_hashtables.h>
#include <net/inet6_hashtables.h>
#include <net/secure_seq.h>
#include <net/ip.h>
+#include <net/sock_reuseport.h>
u32 inet6_ehashfn(const struct net *net,
const struct in6_addr *laddr, const u16 lport,
@@ -131,6 +133,7 @@ struct sock *inet6_lookup_listener(struct net *net,
const struct hlist_nulls_node *node;
struct sock *result;
int score, hiscore, matches = 0, reuseport = 0;
+ bool select_ok = true;
u32 phash = 0;
unsigned int hash = inet_lhashfn(net, hnum);
struct inet_listen_hashbucket *ilb = &hashinfo->listening_hash[hash];
@@ -148,6 +151,15 @@ begin:
if (reuseport) {
phash = inet6_ehashfn(net, daddr, hnum,
saddr, sport);
+ if (select_ok) {
+ struct sock *sk2;
+ sk2 = reuseport_select_sock(sk, phash,
+ skb, doff);
+ if (sk2) {
+ result = sk2;
+ goto found;
+ }
+ }
matches = 1;
}
} else if (score == hiscore && reuseport) {
@@ -165,11 +177,13 @@ begin:
if (get_nulls_value(node) != hash + LISTENING_NULLS_BASE)
goto begin;
if (result) {
+found:
if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt)))
result = NULL;
else if (unlikely(compute_score(result, net, hnum, daddr,
dif) < hiscore)) {
sock_put(result);
+ select_ok = false;
goto begin;
}
}
@@ -283,7 +297,7 @@ int inet6_hash(struct sock *sk)
{
if (sk->sk_state != TCP_CLOSE) {
local_bh_disable();
- __inet_hash(sk, NULL);
+ __inet_hash(sk, NULL, ipv6_rcv_saddr_equal);
local_bh_enable();
}