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Merge branch 'sk_txhash'

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Tom Herbert says:

====================
net: Initialize sk_hash to random value and reset for failing cnxs

This patch set implements a common function to simply set sk_txhash to
a random number instead of going through the trouble to call flow
dissector. From dst_negative_advice we now reset the sk_txhash in hopes
of finding a better ECMP path through the network. Changing sk_txhash
affects:
  - IPv6 flow label and UDP source port which affect ECMP in the network
  - Local ECMP route selection (pending changes to use sk_txhash)
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2015-07-29 22:44:05 -07:00
commit 97493e6a4b
7 changed files with 22 additions and 41 deletions
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16
include/net/ip.h
View file

@ -370,22 +370,6 @@ static inline void iph_to_flow_copy_v4addrs(struct flow_keys *flow,
flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
}
static inline void inet_set_txhash(struct sock *sk)
{
struct inet_sock *inet = inet_sk(sk);
struct flow_keys keys;
memset(&keys, 0, sizeof(keys));
keys.addrs.v4addrs.src = inet->inet_saddr;
keys.addrs.v4addrs.dst = inet->inet_daddr;
keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
keys.ports.src = inet->inet_sport;
keys.ports.dst = inet->inet_dport;
sk->sk_txhash = flow_hash_from_keys(&keys);
}
static inline __wsum inet_gro_compute_pseudo(struct sk_buff *skb, int proto)
{
const struct iphdr *iph = skb_gro_network_header(skb);

19
include/net/ipv6.h
View file

@ -707,25 +707,6 @@ static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow,
}
#if IS_ENABLED(CONFIG_IPV6)
static inline void ip6_set_txhash(struct sock *sk)
{
struct inet_sock *inet = inet_sk(sk);
struct ipv6_pinfo *np = inet6_sk(sk);
struct flow_keys keys;
memset(&keys, 0, sizeof(keys));
memcpy(&keys.addrs.v6addrs.src, &np->saddr,
sizeof(keys.addrs.v6addrs.src));
memcpy(&keys.addrs.v6addrs.dst, &sk->sk_v6_daddr,
sizeof(keys.addrs.v6addrs.dst));
keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
keys.ports.src = inet->inet_sport;
keys.ports.dst = inet->inet_dport;
sk->sk_txhash = flow_hash_from_keys(&keys);
}
static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
__be32 flowlabel, bool autolabel)
{

16
include/net/sock.h
View file

@ -1687,6 +1687,20 @@ static inline void sock_graft(struct sock *sk, struct socket *parent)
kuid_t sock_i_uid(struct sock *sk);
unsigned long sock_i_ino(struct sock *sk);
static inline void sk_set_txhash(struct sock *sk)
{
sk->sk_txhash = prandom_u32();
if (unlikely(!sk->sk_txhash))
sk->sk_txhash = 1;
}
static inline void sk_rethink_txhash(struct sock *sk)
{
if (sk->sk_txhash)
sk_set_txhash(sk);
}
static inline struct dst_entry *
__sk_dst_get(struct sock *sk)
{
@ -1711,6 +1725,8 @@ static inline void dst_negative_advice(struct sock *sk)
{
struct dst_entry *ndst, *dst = __sk_dst_get(sk);
sk_rethink_txhash(sk);
if (dst && dst->ops->negative_advice) {
ndst = dst->ops->negative_advice(dst);

2
net/ipv4/datagram.c
View file

@ -74,7 +74,7 @@ int __ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len
inet->inet_daddr = fl4->daddr;
inet->inet_dport = usin->sin_port;
sk->sk_state = TCP_ESTABLISHED;
inet_set_txhash(sk);
sk_set_txhash(sk);
inet->inet_id = jiffies;
sk_dst_set(sk, &rt->dst);

4
net/ipv4/tcp_ipv4.c
View file

@ -222,7 +222,7 @@ int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
if (err)
goto failure;
inet_set_txhash(sk);
sk_set_txhash(sk);
rt = ip_route_newports(fl4, rt, orig_sport, orig_dport,
inet->inet_sport, inet->inet_dport, sk);
@ -1277,7 +1277,7 @@ struct sock *tcp_v4_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
newinet->mc_ttl = ip_hdr(skb)->ttl;
newinet->rcv_tos = ip_hdr(skb)->tos;
inet_csk(newsk)->icsk_ext_hdr_len = 0;
inet_set_txhash(newsk);
sk_set_txhash(newsk);
if (inet_opt)
inet_csk(newsk)->icsk_ext_hdr_len = inet_opt->opt.optlen;
newinet->inet_id = newtp->write_seq ^ jiffies;

2
net/ipv6/datagram.c
View file

@ -199,7 +199,7 @@ static int __ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int a
NULL);
sk->sk_state = TCP_ESTABLISHED;
ip6_set_txhash(sk);
sk_set_txhash(sk);
out:
fl6_sock_release(flowlabel);
return err;

4
net/ipv6/tcp_ipv6.c
View file

@ -276,7 +276,7 @@ static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
if (err)
goto late_failure;
ip6_set_txhash(sk);
sk_set_txhash(sk);
if (!tp->write_seq && likely(!tp->repair))
tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32,
@ -1090,7 +1090,7 @@ static struct sock *tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr;
newsk->sk_bound_dev_if = ireq->ir_iif;
ip6_set_txhash(newsk);
sk_set_txhash(newsk);
/* Now IPv6 options...