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can: raw: add support for SO_TXTIME/SCM_TXTIME 

This patch calls into sock_cmsg_send() to parse the user supplied
control information into a struct sockcm_cookie. Then assign the
requested transmit time to the skb.

This makes it possible to use the Earliest TXTIME First (ETF) packet
scheduler with the CAN_RAW protocol. The user can send a CAN_RAW frame
with a TXTIME and the kernel (with the ETF scheduler) will take care
of sending it to the network interface.

Link: https://lore.kernel.org/all/20220502091946.1916211-3-mkl@pengutronix.de
Acked-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Marc Kleine-Budde 2022-04-21 12:31:52 +02:00
parent 2af84932b3
commit 51a0d5e511
1 changed files with 10 additions and 1 deletions
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11
net/can/raw.c
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@ -772,6 +772,7 @@ static int raw_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
{
struct sock *sk = sock->sk;
struct raw_sock *ro = raw_sk(sk);
struct sockcm_cookie sockc;
struct sk_buff *skb;
struct net_device *dev;
int ifindex;
@ -817,10 +818,18 @@ static int raw_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
if (err < 0)
goto free_skb;
skb_setup_tx_timestamp(skb, sk->sk_tsflags);
sockcm_init(&sockc, sk);
if (msg->msg_controllen) {
err = sock_cmsg_send(sk, msg, &sockc);
if (unlikely(err))
goto free_skb;
}
skb->dev = dev;
skb->priority = sk->sk_priority;
skb->tstamp = sockc.transmit_time;
skb_setup_tx_timestamp(skb, sockc.tsflags);
err = can_send(skb, ro->loopback);