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tcp: Add tcp_retransmit_stamp() helper routine

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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>
This commit is contained in:
Jon Maxwell 2018-07-19 11:14:43 +10:00 committed by David S. Miller
parent 9bcc66e198
commit a7fa37703d
1 changed files with 17 additions and 8 deletions
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25
net/ipv4/tcp_timer.c
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@ -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);