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tun: Support software transmit time stamping.

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This patch adds transmit time stamping to the tun/tap driver. Similar
support already exists for UDP, can, and raw packets.

Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Richard Cochran 2013-07-19 19:40:10 +02:00 committed by David S. Miller
parent cb820f8e4b
commit eda2977291
2 changed files with 15 additions and 2 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

14
drivers/net/tun.c
View file

@ -739,6 +739,11 @@ static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev)
>= dev->tx_queue_len / tun->numqueues)
goto drop;
if (skb->sk) {
sock_tx_timestamp(skb->sk, &skb_shinfo(skb)->tx_flags);
sw_tx_timestamp(skb);
}
/* Orphan the skb - required as we might hang on to it
* for indefinite time. */
if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC)))
@ -1476,7 +1481,6 @@ static int tun_sendmsg(struct kiocb *iocb, struct socket *sock,
return ret;
}
static int tun_recvmsg(struct kiocb *iocb, struct socket *sock,
struct msghdr *m, size_t total_len,
int flags)
@ -1488,10 +1492,15 @@ static int tun_recvmsg(struct kiocb *iocb, struct socket *sock,
if (!tun)
return -EBADFD;
if (flags & ~(MSG_DONTWAIT|MSG_TRUNC)) {
if (flags & ~(MSG_DONTWAIT|MSG_TRUNC|MSG_ERRQUEUE)) {
ret = -EINVAL;
goto out;
}
if (flags & MSG_ERRQUEUE) {
ret = sock_recv_errqueue(sock->sk, m, total_len,
SOL_PACKET, TUN_TX_TIMESTAMP);
goto out;
}
ret = tun_do_read(tun, tfile, iocb, m->msg_iov, total_len,
flags & MSG_DONTWAIT);
if (ret > total_len) {
@ -2274,6 +2283,7 @@ static const struct ethtool_ops tun_ethtool_ops = {
.get_msglevel = tun_get_msglevel,
.set_msglevel = tun_set_msglevel,
.get_link = ethtool_op_get_link,
.get_ts_info = ethtool_op_get_ts_info,
};

3
include/uapi/linux/if_tun.h
View file

@ -71,6 +71,9 @@
/* read-only flag */
#define IFF_PERSIST 0x0800
/* Socket options */
#define TUN_TX_TIMESTAMP 1
/* Features for GSO (TUNSETOFFLOAD). */
#define TUN_F_CSUM 0x01 /* You can hand me unchecksummed packets. */
#define TUN_F_TSO4 0x02 /* I can handle TSO for IPv4 packets */