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authorJon Maxwell <jmaxwell37@gmail.com>2018-07-19 11:14:43 +1000
committerDavid S. Miller <davem@davemloft.net>2018-07-21 10:28:55 -0700
commita7fa37703d495310819d0a6747e5b32362305374 (patch)
treef404c246257679386ce9b81aa0c8e13b1f85a567 /net/ipv4/tcp_timer.c
parenttcp: convert icsk_user_timeout from jiffies to msecs (diff)
downloadlinux-dev-a7fa37703d495310819d0a6747e5b32362305374.tar.xz
linux-dev-a7fa37703d495310819d0a6747e5b32362305374.zip
tcp: Add tcp_retransmit_stamp() helper routine
Create a seperate helper routine as per Neal Cardwells suggestion. To be used by the final commit in this series and retransmits_timed_out(). Signed-off-by: Jon Maxwell <jmaxwell37@gmail.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_timer.c')
-rw-r--r--net/ipv4/tcp_timer.c25
1 files changed, 17 insertions, 8 deletions
diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c
index fa34984d0b12..d212f183dd2d 100644
--- a/net/ipv4/tcp_timer.c
+++ b/net/ipv4/tcp_timer.c
@@ -22,6 +22,20 @@
#include <linux/gfp.h>
#include <net/tcp.h>
+u32 tcp_retransmit_stamp(const struct sock *sk)
+{
+ u32 start_ts = tcp_sk(sk)->retrans_stamp;
+
+ if (unlikely(!start_ts)) {
+ struct sk_buff *head = tcp_rtx_queue_head(sk);
+
+ if (!head)
+ return 0;
+ start_ts = tcp_skb_timestamp(head);
+ }
+ return start_ts;
+}
+
/**
* tcp_write_err() - close socket and save error info
* @sk: The socket the error has appeared on.
@@ -166,14 +180,9 @@ static bool retransmits_timed_out(struct sock *sk,
if (!inet_csk(sk)->icsk_retransmits)
return false;
- start_ts = tcp_sk(sk)->retrans_stamp;
- if (unlikely(!start_ts)) {
- struct sk_buff *head = tcp_rtx_queue_head(sk);
-
- if (!head)
- return false;
- start_ts = tcp_skb_timestamp(head);
- }
+ start_ts = tcp_retransmit_stamp(sk);
+ if (!start_ts)
+ return false;
if (likely(timeout == 0)) {
linear_backoff_thresh = ilog2(TCP_RTO_MAX/rto_base);