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authorMarc Kleine-Budde <mkl@pengutronix.de>2022-04-21 13:31:52 +0300
committerMarc Kleine-Budde <mkl@pengutronix.de>2022-05-16 23:03:45 +0300
commit51a0d5e51178fcd147c1b8fdab2ed16b561326db (patch)
tree39fcd972775f40e6b4476036e91de885495ef260 /net/can
parent2af84932b3a1db29e37b10ef7f268da47489eb16 (diff)
downloadlinux-51a0d5e51178fcd147c1b8fdab2ed16b561326db.tar.xz
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.c11
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);