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rps: Add flag to skb to indicate rxhash is based on L4 tuple

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The l4_rxhash flag was added to the skb structure to indicate
that the rxhash value was computed over the 4 tuple for the
packet which includes the port information in the encapsulated
transport packet.  This is used by the stack to preserve the
rxhash value in __skb_rx_tunnel.

Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Herbert 2011-08-14 19:45:55 +00:00 committed by David S. Miller
parent 792df22cd0
commit bdeab99191
9 changed files with 39 additions and 19 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
include/linux/skbuff.h
View file

@ -414,6 +414,7 @@ struct sk_buff {
__u8 ndisc_nodetype:2;
#endif
__u8 ooo_okay:1;
__u8 l4_rxhash:1;
kmemcheck_bitfield_end(flags2);
/* 0/13 bit hole */
@ -572,11 +573,11 @@ extern unsigned int skb_find_text(struct sk_buff *skb, unsigned int from,
unsigned int to, struct ts_config *config,
struct ts_state *state);
extern __u32 __skb_get_rxhash(struct sk_buff *skb);
extern void __skb_get_rxhash(struct sk_buff *skb);
static inline __u32 skb_get_rxhash(struct sk_buff *skb)
{
if (!skb->rxhash)
skb->rxhash = __skb_get_rxhash(skb);
__skb_get_rxhash(skb);
return skb->rxhash;
}

9
include/net/dst.h
View file

@ -325,7 +325,14 @@ static inline void skb_dst_force(struct sk_buff *skb)
static inline void __skb_tunnel_rx(struct sk_buff *skb, struct net_device *dev)
{
skb->dev = dev;
skb->rxhash = 0;
/*
* Clear rxhash so that we can recalulate the hash for the
* encapsulated packet, unless we have already determine the hash
* over the L4 4-tuple.
*/
if (!skb->l4_rxhash)
skb->rxhash = 0;
skb_set_queue_mapping(skb, 0);
skb_dst_drop(skb);
nf_reset(skb);

15
include/net/sock.h
View file

@ -686,16 +686,25 @@ static inline void sock_rps_reset_flow(const struct sock *sk)
#endif
}
static inline void sock_rps_save_rxhash(struct sock *sk, u32 rxhash)
static inline void sock_rps_save_rxhash(struct sock *sk,
const struct sk_buff *skb)
{
#ifdef CONFIG_RPS
if (unlikely(sk->sk_rxhash != rxhash)) {
if (unlikely(sk->sk_rxhash != skb->rxhash)) {
sock_rps_reset_flow(sk);
sk->sk_rxhash = rxhash;
sk->sk_rxhash = skb->rxhash;
}
#endif
}
static inline void sock_rps_reset_rxhash(struct sock *sk)
{
#ifdef CONFIG_RPS
sock_rps_reset_flow(sk);
sk->sk_rxhash = 0;
#endif
}
#define sk_wait_event(__sk, __timeo, __condition) \
({ int __rc; \
release_sock(__sk); \

10
net/core/dev.c
View file

@ -2519,10 +2519,11 @@ static inline void ____napi_schedule(struct softnet_data *sd,
/*
* __skb_get_rxhash: calculate a flow hash based on src/dst addresses
* and src/dst port numbers. Returns a non-zero hash number on success
* and 0 on failure.
* and src/dst port numbers. Sets rxhash in skb to non-zero hash value
* on success, zero indicates no valid hash. Also, sets l4_rxhash in skb
* if hash is a canonical 4-tuple hash over transport ports.
*/
__u32 __skb_get_rxhash(struct sk_buff *skb)
void __skb_get_rxhash(struct sk_buff *skb)
{
int nhoff, hash = 0, poff;
const struct ipv6hdr *ip6;
@ -2574,6 +2575,7 @@ __u32 __skb_get_rxhash(struct sk_buff *skb)
ports.v32 = * (__force u32 *) (skb->data + nhoff);
if (ports.v16[1] < ports.v16[0])
swap(ports.v16[0], ports.v16[1]);
skb->l4_rxhash = 1;
}
}
@ -2586,7 +2588,7 @@ __u32 __skb_get_rxhash(struct sk_buff *skb)
hash = 1;
done:
return hash;
skb->rxhash = hash;
}
EXPORT_SYMBOL(__skb_get_rxhash);

1
net/core/skbuff.c
View file

@ -529,6 +529,7 @@ static void __copy_skb_header(struct sk_buff *new, const struct sk_buff *old)
new->mac_header = old->mac_header;
skb_dst_copy(new, old);
new->rxhash = old->rxhash;
new->l4_rxhash = old->l4_rxhash;
#ifdef CONFIG_XFRM
new->sp = secpath_get(old->sp);
#endif

6
net/ipv4/tcp_ipv4.c
View file

@ -1578,7 +1578,7 @@ int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb)
#endif
if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */
sock_rps_save_rxhash(sk, skb->rxhash);
sock_rps_save_rxhash(sk, skb);
if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len)) {
rsk = sk;
goto reset;
@ -1595,7 +1595,7 @@ int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb)
goto discard;
if (nsk != sk) {
sock_rps_save_rxhash(nsk, skb->rxhash);
sock_rps_save_rxhash(nsk, skb);
if (tcp_child_process(sk, nsk, skb)) {
rsk = nsk;
goto reset;
@ -1603,7 +1603,7 @@ int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb)
return 0;
}
} else
sock_rps_save_rxhash(sk, skb->rxhash);
sock_rps_save_rxhash(sk, skb);
if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) {
rsk = sk;

4
net/ipv4/udp.c
View file

@ -1267,7 +1267,7 @@ int udp_disconnect(struct sock *sk, int flags)
sk->sk_state = TCP_CLOSE;
inet->inet_daddr = 0;
inet->inet_dport = 0;
sock_rps_save_rxhash(sk, 0);
sock_rps_reset_rxhash(sk);
sk->sk_bound_dev_if = 0;
if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK))
inet_reset_saddr(sk);
@ -1355,7 +1355,7 @@ static int __udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
int rc;
if (inet_sk(sk)->inet_daddr)
sock_rps_save_rxhash(sk, skb->rxhash);
sock_rps_save_rxhash(sk, skb);
rc = ip_queue_rcv_skb(sk, skb);
if (rc < 0) {

6
net/ipv6/tcp_ipv6.c
View file

@ -1628,7 +1628,7 @@ static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
opt_skb = skb_clone(skb, GFP_ATOMIC);
if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */
sock_rps_save_rxhash(sk, skb->rxhash);
sock_rps_save_rxhash(sk, skb);
if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len))
goto reset;
if (opt_skb)
@ -1650,7 +1650,7 @@ static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
* the new socket..
*/
if(nsk != sk) {
sock_rps_save_rxhash(nsk, skb->rxhash);
sock_rps_save_rxhash(nsk, skb);
if (tcp_child_process(sk, nsk, skb))
goto reset;
if (opt_skb)
@ -1658,7 +1658,7 @@ static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
return 0;
}
} else
sock_rps_save_rxhash(sk, skb->rxhash);
sock_rps_save_rxhash(sk, skb);
if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len))
goto reset;

2
net/ipv6/udp.c
View file

@ -509,7 +509,7 @@ int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
int is_udplite = IS_UDPLITE(sk);
if (!ipv6_addr_any(&inet6_sk(sk)->daddr))
sock_rps_save_rxhash(sk, skb->rxhash);
sock_rps_save_rxhash(sk, skb);
if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
goto drop;