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authorDavid S. Miller <davem@davemloft.net>2012-07-10 00:49:14 -0700
committerDavid S. Miller <davem@davemloft.net>2012-07-10 22:39:57 -0700
commit51c5d0c4b169bf762f09e0d5b283a7f0b2a45739 (patch)
tree9dd99b27be4dc469954a2d67515593c9f71cbcd0 /include/net
parentab92bb2f679d66c7e12a6b1c0cdd76fe308f6546 (diff)
tcp: Maintain dynamic metrics in local cache.
Maintain a local hash table of TCP dynamic metrics blobs. Computed TCP metrics are no longer maintained in the route metrics. The table uses RCU and an extremely simple hash so that it has low latency and low overhead. A simple hash is legitimate because we only make metrics blobs for fully established connections. Some tweaking of the default hash table sizes, metric timeouts, and the hash chain length limit certainly could use some tweaking. But the basic design seems sound. With help from Eric Dumazet and Joe Perches. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net')
-rw-r--r--include/net/netns/ipv4.h3
-rw-r--r--include/net/tcp.h1
2 files changed, 4 insertions, 0 deletions
diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h
index 599e48fa97c..2e089a99d60 100644
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h
@@ -7,6 +7,7 @@
#include <net/inet_frag.h>
+struct tcpm_hash_bucket;
struct ctl_table_header;
struct ipv4_devconf;
struct fib_rules_ops;
@@ -39,6 +40,8 @@ struct netns_ipv4 {
struct sock **icmp_sk;
struct sock *tcp_sock;
struct inet_peer_base *peers;
+ struct tcpm_hash_bucket *tcp_metrics_hash;
+ unsigned int tcp_metrics_hash_mask;
struct netns_frags frags;
#ifdef CONFIG_NETFILTER
struct xt_table *iptable_filter;
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 5478356ea8c..0900d63d162 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -389,6 +389,7 @@ extern void tcp_enter_loss(struct sock *sk, int how);
extern void tcp_clear_retrans(struct tcp_sock *tp);
extern void tcp_update_metrics(struct sock *sk);
extern void tcp_init_metrics(struct sock *sk);
+extern void tcp_metrics_init(void);
extern bool tcp_peer_is_proven(struct request_sock *req, struct dst_entry *dst);
extern void tcp_disable_fack(struct tcp_sock *tp);
extern void tcp_close(struct sock *sk, long timeout);