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tcp: Add tcp_retransmit_stamp() helper routine

PATCH In review Jon Maxwell 3 participants 3 messages Jul 19, 2018

Subsystems (3)
Networking Network drivers TCP
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Jon Maxwell

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#0 lore raw

PATCH v4 2/3 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 <[email protected]>
---
 net/ipv4/tcp_timer.c | 25 +++++++++++++++++--------
 1 file changed, 17 insertions(+), 8 deletions(-)
net/ipv4/tcp_timer.c +17 -8
index fa34984d0b12..d212f183dd2d 100644
@@ -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);
Signature · 1 line
2.13.6
#1 lore raw

Hello!

Quoted 1 line · Jon Maxwell

Create a seperate helper routine as per Neal Cardwells suggestion. To

Cardwell's. Perhaps copuld be fixed while applying...

Quoted 3 lines

be used by the final commit in this series and retransmits_timed_out().

Signed-off-by Jon Maxwell <[email protected]>

[...]

MBR, Sergei