ipv6: make lookups simpler and faster
TCP listener refactoring, part 4 :
To speed up inet lookups, we moved IPv4 addresses from inet to struct
sock_common
Now is time to do the same for IPv6, because it permits us to have fast
lookups for all kind of sockets, including upcoming SYN_RECV.
Getting IPv6 addresses in TCP lookups currently requires two extra cache
lines, plus a dereference (and memory stall).
inet6_sk(sk) does the dereference of inet_sk(__sk)->pinet6
This patch is way bigger than its IPv4 counter part, because for IPv4,
we could add aliases (inet_daddr, inet_rcv_saddr), while on IPv6,
it's not doable easily.
inet6_sk(sk)->daddr becomes sk->sk_v6_daddr
inet6_sk(sk)->rcv_saddr becomes sk->sk_v6_rcv_saddr
And timewait socket also have tw->tw_v6_daddr & tw->tw_v6_rcv_saddr
at the same offset.
We get rid of INET6_TW_MATCH() as INET6_MATCH() is now the generic
macro.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/tcp_probe.c b/net/ipv4/tcp_probe.c
index 611beab..8b97d71e 100644
--- a/net/ipv4/tcp_probe.c
+++ b/net/ipv4/tcp_probe.c
@@ -101,22 +101,6 @@
si4.sin_addr.s_addr = inet->inet_##mem##addr; \
} while (0) \
-#if IS_ENABLED(CONFIG_IPV6)
-#define tcp_probe_copy_fl_to_si6(inet, si6, mem) \
- do { \
- struct ipv6_pinfo *pi6 = inet->pinet6; \
- si6.sin6_family = AF_INET6; \
- si6.sin6_port = inet->inet_##mem##port; \
- si6.sin6_addr = pi6->mem##addr; \
- si6.sin6_flowinfo = 0; /* No need here. */ \
- si6.sin6_scope_id = 0; /* No need here. */ \
- } while (0)
-#else
-#define tcp_probe_copy_fl_to_si6(fl, si6, mem) \
- do { \
- memset(&si6, 0, sizeof(si6)); \
- } while (0)
-#endif
/*
* Hook inserted to be called before each receive packet.
@@ -147,8 +131,17 @@
tcp_probe_copy_fl_to_si4(inet, p->dst.v4, d);
break;
case AF_INET6:
- tcp_probe_copy_fl_to_si6(inet, p->src.v6, s);
- tcp_probe_copy_fl_to_si6(inet, p->dst.v6, d);
+ memset(&p->src.v6, 0, sizeof(p->src.v6));
+ memset(&p->dst.v6, 0, sizeof(p->dst.v6));
+#if IS_ENABLED(CONFIG_IPV6)
+ p->src.v6.sin6_family = AF_INET6;
+ p->src.v6.sin6_port = inet->inet_sport;
+ p->src.v6.sin6_addr = inet6_sk(sk)->saddr;
+
+ p->dst.v6.sin6_family = AF_INET6;
+ p->dst.v6.sin6_port = inet->inet_dport;
+ p->dst.v6.sin6_addr = sk->sk_v6_daddr;
+#endif
break;
default:
BUG();