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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
commit eda2977291
2 changed files with 15 additions and 2 deletions
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3
include/uapi/linux/if_tun.h
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@ -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 */