[RFC v3 net-next 07/18] net: packet: Hook into time based transmission.

[Jesus Sanchez-Palencia]

From: Richard Cochran <rcoch...@linutronix.de>

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

Signed-off-by: Richard Cochran <rcoch...@linutronix.de>
Signed-off-by: Jesus Sanchez-Palencia <jesus.sanchez-palen...@intel.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 2c5a6fe5d749..b2115fac2a8d 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -1976,6 +1976,7 @@ 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);
@@ -1987,6 +1988,7 @@ 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);
 
@@ -2484,6 +2486,7 @@ 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;
 
@@ -2660,6 +2663,7 @@ 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);
@@ -2856,6 +2860,7 @@ 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) {
@@ -2928,6 +2933,7 @@ 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());
-- 
2.16.2