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Subject[PATCH RFC V1 net-next 5/6] net: packet: Hook into time based transmission.
Date
For raw layer-2 packets, copy the desired future transmit time from
the CMSG cookie into the skb.

Signed-off-by: Richard Cochran <rcochran@linutronix.de>
---
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 c26172995511..342c6cc81a42 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -1984,6 +1984,7 @@ 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);
@@ -1995,6 +1996,7 @@ 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->transmit_time = sockc.transmit_time;

sock_tx_timestamp(sk, sockc.tsflags, &skb_shinfo(skb)->tx_flags);

@@ -2492,6 +2494,7 @@ 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->transmit_time = sockc->transmit_time;
sock_tx_timestamp(&po->sk, sockc->tsflags, &skb_shinfo(skb)->tx_flags);
skb_shinfo(skb)->destructor_arg = ph.raw;

@@ -2668,6 +2671,7 @@ 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);
@@ -2863,6 +2867,7 @@ 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) {
@@ -2934,6 +2939,7 @@ 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->transmit_time = sockc.transmit_time;

if (po->has_vnet_hdr) {
err = virtio_net_hdr_to_skb(skb, &vnet_hdr, vio_le());
--
2.11.0
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