diff options
| author | Marc Kleine-Budde <mkl@pengutronix.de> | 2022-04-21 12:31:52 +0200 |
|---|---|---|
| committer | Marc Kleine-Budde <mkl@pengutronix.de> | 2022-05-16 22:03:45 +0200 |
| commit | 51a0d5e51178fcd147c1b8fdab2ed16b561326db (patch) | |
| tree | 39fcd972775f40e6b4476036e91de885495ef260 /net/can | |
| parent | 2af84932b3a1db29e37b10ef7f268da47489eb16 (diff) | |
| download | lwn-51a0d5e51178fcd147c1b8fdab2ed16b561326db.tar.gz lwn-51a0d5e51178fcd147c1b8fdab2ed16b561326db.zip | |
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>
Diffstat (limited to 'net/can')
| -rw-r--r-- | net/can/raw.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/net/can/raw.c b/net/can/raw.c index 1a68efae43c2..d1bd9cc51ebe 100644 --- a/net/can/raw.c +++ b/net/can/raw.c @@ -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); |