linux-kernel - [PATCH RFC V1 net-next 4/6] net: ipv4: udp: Hook into time based transmission.

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Date:   Mon, 18 Sep 2017 09:41:19 +0200
From:   Richard Cochran <rcochran@...utronix.de>
To:     <netdev@...r.kernel.org>
Cc:     <linux-kernel@...r.kernel.org>, intel-wired-lan@...ts.osuosl.org,
        Andre Guedes <andre.guedes@...el.com>,
        Anna-Maria Gleixner <anna-maria@...utronix.de>,
        David Miller <davem@...emloft.net>,
        Henrik Austad <henrik@...tad.us>,
        Jesus Sanchez-Palencia <jesus.sanchez-palencia@...el.com>,
        John Stultz <john.stultz@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vinicius Costa Gomes <vinicius.gomes@...el.com>
Subject: [PATCH RFC V1 net-next 4/6] net: ipv4: udp: Hook into time based transmission.

For udp packets, copy the desired future transmit time from the CMSG
cookie into the skb.

Signed-off-by: Richard Cochran <rcochran@...utronix.de>
---
 net/ipv4/udp.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index ef29df8648e4..669f63495877 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -949,6 +949,7 @@ int udp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
 	}
 
 	ipc.sockc.tsflags = sk->sk_tsflags;
+	ipc.sockc.transmit_time = 0;
 	ipc.addr = inet->inet_saddr;
 	ipc.oif = sk->sk_bound_dev_if;
 
@@ -1050,8 +1051,10 @@ int udp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
 				  sizeof(struct udphdr), &ipc, &rt,
 				  msg->msg_flags);
 		err = PTR_ERR(skb);
-		if (!IS_ERR_OR_NULL(skb))
+		if (!IS_ERR_OR_NULL(skb)) {
+			skb->transmit_time = ipc.sockc.transmit_time;
 			err = udp_send_skb(skb, fl4);
+		}
 		goto out;
 	}
 
-- 
2.11.0