diff options
| author | Yuchung Cheng <ycheng@google.com> | 2012-07-19 06:43:06 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-07-19 10:55:36 -0700 |
| commit | 1fe4c481ba637660793217769695c146a037bd54 (patch) | |
| tree | d90f9708cd6a291988b198ade7daf0d9f58c34cf /net/ipv4 | |
| parent | 2100c8d2d9db23c0a09901a782bb4e3b21bee298 (diff) | |
net-tcp: Fast Open client - cookie cache
With help from Eric Dumazet, add Fast Open metrics in tcp metrics cache.
The basic ones are MSS and the cookies. Later patch will cache more to
handle unfriendly middleboxes.
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/tcp_metrics.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/net/ipv4/tcp_metrics.c b/net/ipv4/tcp_metrics.c index 1a115b665792..d02ff3777785 100644 --- a/net/ipv4/tcp_metrics.c +++ b/net/ipv4/tcp_metrics.c @@ -30,6 +30,11 @@ enum tcp_metric_index { TCP_METRIC_MAX, }; +struct tcp_fastopen_metrics { + u16 mss; + struct tcp_fastopen_cookie cookie; +}; + struct tcp_metrics_block { struct tcp_metrics_block __rcu *tcpm_next; struct inetpeer_addr tcpm_addr; @@ -38,6 +43,7 @@ struct tcp_metrics_block { u32 tcpm_ts_stamp; u32 tcpm_lock; u32 tcpm_vals[TCP_METRIC_MAX]; + struct tcp_fastopen_metrics tcpm_fastopen; }; static bool tcp_metric_locked(struct tcp_metrics_block *tm, @@ -118,6 +124,8 @@ static void tcpm_suck_dst(struct tcp_metrics_block *tm, struct dst_entry *dst) tm->tcpm_vals[TCP_METRIC_REORDERING] = dst_metric_raw(dst, RTAX_REORDERING); tm->tcpm_ts = 0; tm->tcpm_ts_stamp = 0; + tm->tcpm_fastopen.mss = 0; + tm->tcpm_fastopen.cookie.len = 0; } static struct tcp_metrics_block *tcpm_new(struct dst_entry *dst, @@ -633,6 +641,49 @@ bool tcp_tw_remember_stamp(struct inet_timewait_sock *tw) return ret; } +static DEFINE_SEQLOCK(fastopen_seqlock); + +void tcp_fastopen_cache_get(struct sock *sk, u16 *mss, + struct tcp_fastopen_cookie *cookie) +{ + struct tcp_metrics_block *tm; + + rcu_read_lock(); + tm = tcp_get_metrics(sk, __sk_dst_get(sk), false); + if (tm) { + struct tcp_fastopen_metrics *tfom = &tm->tcpm_fastopen; + unsigned int seq; + + do { + seq = read_seqbegin(&fastopen_seqlock); + if (tfom->mss) + *mss = tfom->mss; + *cookie = tfom->cookie; + } while (read_seqretry(&fastopen_seqlock, seq)); + } + rcu_read_unlock(); +} + + +void tcp_fastopen_cache_set(struct sock *sk, u16 mss, + struct tcp_fastopen_cookie *cookie) +{ + struct tcp_metrics_block *tm; + + rcu_read_lock(); + tm = tcp_get_metrics(sk, __sk_dst_get(sk), true); + if (tm) { + struct tcp_fastopen_metrics *tfom = &tm->tcpm_fastopen; + + write_seqlock_bh(&fastopen_seqlock); + tfom->mss = mss; + if (cookie->len > 0) + tfom->cookie = *cookie; + write_sequnlock_bh(&fastopen_seqlock); + } + rcu_read_unlock(); +} + static unsigned long tcpmhash_entries; static int __init set_tcpmhash_entries(char *str) { |