netdev - [RFC PATCH v2 net-next 5/7] tcp: Make use of MSG_EOR in tcp

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Date:	Mon, 18 Apr 2016 15:46:07 -0700
From:	Martin KaFai Lau <kafai@...com>
To:	<netdev@...r.kernel.org>
CC:	Eric Dumazet <edumazet@...gle.com>,
	Neal Cardwell <ncardwell@...gle.com>,
	Soheil Hassas Yeganeh <soheil.kdev@...il.com>,
	Willem de Bruijn <willemb@...gle.com>,
	Yuchung Cheng <ycheng@...gle.com>,
	Kernel Team <kernel-team@...com>
Subject: [RFC PATCH v2 net-next 5/7] tcp: Make use of MSG_EOR in tcp_sendpage

It reuses the tcp_sendmsg_noappend() to decide if a new_segment
is needed before entering the loop.  More checks could be added
later for the tcp_sendpage case to decide if a new_segment is
needed immediately.

Signed-off-by: Martin KaFai Lau <kafai@...com>
Cc: Eric Dumazet <edumazet@...gle.com>
Cc: Neal Cardwell <ncardwell@...gle.com>
Cc: Soheil Hassas Yeganeh <soheil.kdev@...il.com>
Cc: Willem de Bruijn <willemb@...gle.com>
Cc: Yuchung Cheng <ycheng@...gle.com>
---
 net/ipv4/tcp.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 2918f42..6bb33b8 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -913,6 +913,9 @@ static ssize_t do_tcp_sendpages(struct sock *sk, struct page *page, int offset,
 	if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN))
 		goto out_err;
 
+	if (tcp_sendmsg_noappend(sk, sk->sk_tsflags))
+		goto new_segment;
+
 	while (size > 0) {
 		struct sk_buff *skb = tcp_write_queue_tail(sk);
 		int copy, i;
@@ -969,7 +972,7 @@ new_segment:
 		offset += copy;
 		size -= copy;
 		if (!size) {
-			tcp_tx_timestamp(sk, sk->sk_tsflags, skb, 0);
+			tcp_tx_timestamp(sk, sk->sk_tsflags, skb, flags);
 			goto out;
 		}
 
-- 
2.5.1