[PATCH 5.15 029/128] ipv6: move inet6_sk(sk)->rx_dst_cookie to sk->sk_rx_dst_cookie

Greg Kroah-Hartman
2021-12-27T15:45:50Z

From: Eric Dumazet <edumazet@google.com>

[ Upstream commit ef57c1610dd8fba5031bf71e0db73356190de151 ]

Increase cache locality by moving rx_dst_coookie next to sk->sk_rx_dst

This removes one or two cache line misses in IPv6 early demux (TCP/UDP)

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
include/linux/ipv6.h | 1 -
include/net/sock.h | 2 ++
net/ipv6/tcp_ipv6.c | 6 +++---
net/ipv6/udp.c | 4 ++--
4 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h
index ef4a69865737c..c383630d3f065 100644
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h
@@ -282,7 +282,6 @@ struct ipv6_pinfo {
__be32 rcv_flowinfo;

__u32 dst_cookie;
- __u32 rx_dst_cookie;

struct ipv6_mc_socklist __rcu *ipv6_mc_list;
struct ipv6_ac_socklist *ipv6_ac_list;
diff --git a/include/net/sock.h b/include/net/sock.h
index 752601265a955..796f859c69dd7 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -260,6 +260,7 @@ struct bpf_local_storage;
* @sk_wq: sock wait queue and async head
* @sk_rx_dst: receive input route used by early demux
* @sk_rx_dst_ifindex: ifindex for @sk_rx_dst
+ * @sk_rx_dst_cookie: cookie for @sk_rx_dst
* @sk_dst_cache: destination cache
* @sk_dst_pending_confirm: need to confirm neighbour
* @sk_policy: flow policy
@@ -433,6 +434,7 @@ struct sock {
#endif
struct dst_entry *sk_rx_dst;
int sk_rx_dst_ifindex;
+ u32 sk_rx_dst_cookie;

struct dst_entry __rcu *sk_dst_cache;
atomic_t sk_omem_alloc;
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index c72586ee517ba..42eafe35415d1 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -109,7 +109,7 @@ static void inet6_sk_rx_dst_set(struct sock *sk, const struct sk_buff *skb)

sk->sk_rx_dst = dst;
sk->sk_rx_dst_ifindex = skb->skb_iif;
- tcp_inet6_sk(sk)->rx_dst_cookie = rt6_get_cookie(rt);
+ sk->sk_rx_dst_cookie = rt6_get_cookie(rt);
}
}

@@ -1511,7 +1511,7 @@ static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
if (dst) {
if (sk->sk_rx_dst_ifindex != skb->skb_iif ||
INDIRECT_CALL_1(dst->ops->check, ip6_dst_check,
- dst, np->rx_dst_cookie) == NULL) {
+ dst, sk->sk_rx_dst_cookie) == NULL) {
dst_release(dst);
sk->sk_rx_dst = NULL;
}
@@ -1878,7 +1878,7 @@ INDIRECT_CALLABLE_SCOPE void tcp_v6_early_demux(struct sk_buff *skb)
struct dst_entry *dst = READ_ONCE(sk->sk_rx_dst);

if (dst)
- dst = dst_check(dst, tcp_inet6_sk(sk)->rx_dst_cookie);
+ dst = dst_check(dst, sk->sk_rx_dst_cookie);
if (dst &&
sk->sk_rx_dst_ifindex == skb->skb_iif)
skb_dst_set_noref(skb, dst);
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index be6dc64ece29f..12c12619ee357 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -884,7 +884,7 @@ static void udp6_sk_rx_dst_set(struct sock *sk, struct dst_entry *dst)
if (udp_sk_rx_dst_set(sk, dst)) {
const struct rt6_info *rt = (const struct rt6_info *)dst;

- inet6_sk(sk)->rx_dst_cookie = rt6_get_cookie(rt);
+ sk->sk_rx_dst_cookie = rt6_get_cookie(rt);
}
}

@@ -1073,7 +1073,7 @@ INDIRECT_CALLABLE_SCOPE void udp_v6_early_demux(struct sk_buff *skb)
dst = READ_ONCE(sk->sk_rx_dst);

if (dst)
- dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie);
+ dst = dst_check(dst, sk->sk_rx_dst_cookie);
if (dst) {
/* set noref for now.
* any place which wants to hold dst has to call
--
2.34.1