netdev - [PATCH net-next 07/13] tcp: move tcp_ns_to

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Date: Fri, 20 Oct 2023 12:57:42 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, Neal Cardwell <ncardwell@...gle.com>, 
	Yuchung Cheng <ycheng@...gle.com>, Kevin Yang <yyd@...gle.com>, 
	Soheil Hassas Yeganeh <soheil@...gle.com>, Wei Wang <weiwan@...gle.com>, Van Jacobson <vanj@...gle.com>, 
	Florian Westphal <fw@...len.de>, eric.dumazet@...il.com, Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next 07/13] tcp: move tcp_ns_to_ts() to net/ipv4/syncookies.c

tcp_ns_to_ts() is only used once from cookie_init_timestamp().

Also add the 'bool usec_ts' parameter to enable usec TS later.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 include/net/tcp.h     |  6 ------
 net/ipv4/syncookies.c | 10 +++++++++-
 2 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/include/net/tcp.h b/include/net/tcp.h
index 493f8550055bca09b69a9d3129d6ba781a1233f8..b86abf1fbe46061a00dbd202323792f01a307969 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -824,12 +824,6 @@ static inline u32 tcp_time_stamp_ms(const struct tcp_sock *tp)
 	return div_u64(tp->tcp_mstamp, USEC_PER_MSEC);
 }
 
-/* Convert a nsec timestamp into TCP TSval timestamp (ms based currently) */
-static inline u64 tcp_ns_to_ts(u64 ns)
-{
-	return div_u64(ns, NSEC_PER_SEC / TCP_TS_HZ);
-}
-
 void tcp_mstamp_refresh(struct tcp_sock *tp);
 
 static inline u32 tcp_stamp_us_delta(u64 t1, u64 t0)
diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c
index 3b4dafefb4b036c661bf52f5e7e304b943a4fd5e..62395fdb0ca557caee78d84ae70273eb42a837b9 100644
--- a/net/ipv4/syncookies.c
+++ b/net/ipv4/syncookies.c
@@ -51,6 +51,14 @@ static u32 cookie_hash(__be32 saddr, __be32 daddr, __be16 sport, __be16 dport,
 			    count, &syncookie_secret[c]);
 }
 
+/* Convert one nsec 64bit timestamp to ts (ms or usec resolution) */
+static u64 tcp_ns_to_ts(bool usec_ts, u64 val)
+{
+	if (usec_ts)
+		return div_u64(val, NSEC_PER_USEC);
+
+	return div_u64(val, NSEC_PER_MSEC);
+}
 
 /*
  * when syncookies are in effect and tcp timestamps are enabled we encode
@@ -62,7 +70,7 @@ static u32 cookie_hash(__be32 saddr, __be32 daddr, __be16 sport, __be16 dport,
 u64 cookie_init_timestamp(struct request_sock *req, u64 now)
 {
 	const struct inet_request_sock *ireq = inet_rsk(req);
-	u64 ts, ts_now = tcp_ns_to_ts(now);
+	u64 ts, ts_now = tcp_ns_to_ts(false, now);
 	u32 options = 0;
 
 	options = ireq->wscale_ok ? ireq->snd_wscale : TS_OPT_WSCALE_MASK;
-- 
2.42.0.655.g421f12c284-goog