netdev - [PATCH v1 net-next 04/14] net: packet: Hook into time based transmission.

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Message-Id: <20180627215950.6719-5-jesus.sanchez-palencia@intel.com>
Date:   Wed, 27 Jun 2018 14:59:40 -0700
From:   Jesus Sanchez-Palencia <jesus.sanchez-palencia@...el.com>
To:     netdev@...r.kernel.org
Cc:     tglx@...utronix.de, jan.altenberg@...utronix.de,
        vinicius.gomes@...el.com, kurt.kanzenbach@...utronix.de,
        henrik@...tad.us, richardcochran@...il.com,
        levi.pearson@...man.com, ilias.apalodimas@...aro.org,
        ivan.khoronzhuk@...aro.org, mlichvar@...hat.com,
        willemb@...gle.com, jhs@...atatu.com, xiyou.wangcong@...il.com,
        jiri@...nulli.us, Richard Cochran <rcochran@...utronix.de>,
        Jesus Sanchez-Palencia <jesus.sanchez-palencia@...el.com>
Subject: [PATCH v1 net-next 04/14] net: packet: Hook into time based transmission.

From: Richard Cochran <rcochran@...utronix.de>

For raw layer-2 packets, copy the desired future transmit time from
the CMSG cookie into the skb.

Signed-off-by: Richard Cochran <rcochran@...utronix.de>
Signed-off-by: Jesus Sanchez-Palencia <jesus.sanchez-palencia@...el.com>
---
 net/packet/af_packet.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index ff8e7e245c37..255c0164e0aa 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -1951,6 +1951,7 @@ static int packet_sendmsg_spkt(struct socket *sock, struct msghdr *msg,
 		goto out_unlock;
 	}
 
+	sockc.transmit_time = 0;
 	sockc.tsflags = sk->sk_tsflags;
 	if (msg->msg_controllen) {
 		err = sock_cmsg_send(sk, msg, &sockc);
@@ -1962,6 +1963,7 @@ static int packet_sendmsg_spkt(struct socket *sock, struct msghdr *msg,
 	skb->dev = dev;
 	skb->priority = sk->sk_priority;
 	skb->mark = sk->sk_mark;
+	skb->tstamp = sockc.transmit_time;
 
 	sock_tx_timestamp(sk, sockc.tsflags, &skb_shinfo(skb)->tx_flags);
 
@@ -2457,6 +2459,7 @@ static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
 	skb->dev = dev;
 	skb->priority = po->sk.sk_priority;
 	skb->mark = po->sk.sk_mark;
+	skb->tstamp = sockc->transmit_time;
 	sock_tx_timestamp(&po->sk, sockc->tsflags, &skb_shinfo(skb)->tx_flags);
 	skb_shinfo(skb)->destructor_arg = ph.raw;
 
@@ -2633,6 +2636,7 @@ static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
 	if (unlikely(!(dev->flags & IFF_UP)))
 		goto out_put;
 
+	sockc.transmit_time = 0;
 	sockc.tsflags = po->sk.sk_tsflags;
 	if (msg->msg_controllen) {
 		err = sock_cmsg_send(&po->sk, msg, &sockc);
@@ -2829,6 +2833,7 @@ static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
 	if (unlikely(!(dev->flags & IFF_UP)))
 		goto out_unlock;
 
+	sockc.transmit_time = 0;
 	sockc.tsflags = sk->sk_tsflags;
 	sockc.mark = sk->sk_mark;
 	if (msg->msg_controllen) {
@@ -2903,6 +2908,7 @@ static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
 	skb->dev = dev;
 	skb->priority = sk->sk_priority;
 	skb->mark = sockc.mark;
+	skb->tstamp = sockc.transmit_time;
 
 	if (has_vnet_hdr) {
 		err = virtio_net_hdr_to_skb(skb, &vnet_hdr, vio_le());
-- 
2.17.1