summaryrefslogtreecommitdiffstats
path: root/net/ipv4/tcp_metrics.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/ipv4/tcp_metrics.c')
-rw-r--r--net/ipv4/tcp_metrics.c16
1 files changed, 13 insertions, 3 deletions
diff --git a/net/ipv4/tcp_metrics.c b/net/ipv4/tcp_metrics.c
index d02ff3777785..99779ae44f64 100644
--- a/net/ipv4/tcp_metrics.c
+++ b/net/ipv4/tcp_metrics.c
@@ -32,6 +32,8 @@ enum tcp_metric_index {
struct tcp_fastopen_metrics {
u16 mss;
+ u16 syn_loss:10; /* Recurring Fast Open SYN losses */
+ unsigned long last_syn_loss; /* Last Fast Open SYN loss */
struct tcp_fastopen_cookie cookie;
};
@@ -125,6 +127,7 @@ static void tcpm_suck_dst(struct tcp_metrics_block *tm, struct dst_entry *dst)
tm->tcpm_ts = 0;
tm->tcpm_ts_stamp = 0;
tm->tcpm_fastopen.mss = 0;
+ tm->tcpm_fastopen.syn_loss = 0;
tm->tcpm_fastopen.cookie.len = 0;
}
@@ -644,7 +647,8 @@ bool tcp_tw_remember_stamp(struct inet_timewait_sock *tw)
static DEFINE_SEQLOCK(fastopen_seqlock);
void tcp_fastopen_cache_get(struct sock *sk, u16 *mss,
- struct tcp_fastopen_cookie *cookie)
+ struct tcp_fastopen_cookie *cookie,
+ int *syn_loss, unsigned long *last_syn_loss)
{
struct tcp_metrics_block *tm;
@@ -659,14 +663,15 @@ void tcp_fastopen_cache_get(struct sock *sk, u16 *mss,
if (tfom->mss)
*mss = tfom->mss;
*cookie = tfom->cookie;
+ *syn_loss = tfom->syn_loss;
+ *last_syn_loss = *syn_loss ? tfom->last_syn_loss : 0;
} 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_fastopen_cookie *cookie, bool syn_lost)
{
struct tcp_metrics_block *tm;
@@ -679,6 +684,11 @@ void tcp_fastopen_cache_set(struct sock *sk, u16 mss,
tfom->mss = mss;
if (cookie->len > 0)
tfom->cookie = *cookie;
+ if (syn_lost) {
+ ++tfom->syn_loss;
+ tfom->last_syn_loss = jiffies;
+ } else
+ tfom->syn_loss = 0;
write_sequnlock_bh(&fastopen_seqlock);
}
rcu_read_unlock();