Commit 3d44de9a authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

tcp: add RTAX_FEATURE_TCP_USEC_TS 



This new dst feature flag will be used to allow TCP to use usec
based timestamps instead of msec ones.

ip route .... feature tcp_usec_ts

Also document that RTAX_FEATURE_SACK and RTAX_FEATURE_TIMESTAMP
are unused.

RTAX_FEATURE_ALLFRAG is also going away soon.

Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b04c3320

include/linux/tcp.h

+5 −0
Original line number Diff line number Diff line
@@ -576,4 +576,9 @@ void tcp_sock_set_quickack(struct sock *sk, int val); 
int tcp_sock_set_syncnt(struct sock *sk, int val);

int tcp_sock_set_user_timeout(struct sock *sk, int val);



static inline bool dst_tcp_usec_ts(const struct dst_entry *dst)

{

	return dst_feature(dst, RTAX_FEATURE_TCP_USEC_TS);

}



#endif	/* _LINUX_TCP_H */

include/uapi/linux/rtnetlink.h

+11 −7
Original line number Diff line number Diff line
@@ -503,12 +503,16 @@ enum { 
#define RTAX_MAX (__RTAX_MAX - 1)



#define RTAX_FEATURE_ECN		(1 << 0)

#define RTAX_FEATURE_SACK	(1 << 1)

#define RTAX_FEATURE_TIMESTAMP	(1 << 2)

#define RTAX_FEATURE_SACK		(1 << 1) /* unused */

#define RTAX_FEATURE_TIMESTAMP		(1 << 2) /* unused */

#define RTAX_FEATURE_ALLFRAG		(1 << 3)

#define RTAX_FEATURE_TCP_USEC_TS	(1 << 4)



#define RTAX_FEATURE_MASK	(RTAX_FEATURE_ECN | RTAX_FEATURE_SACK | \

				 RTAX_FEATURE_TIMESTAMP | RTAX_FEATURE_ALLFRAG)

#define RTAX_FEATURE_MASK	(RTAX_FEATURE_ECN |		\

				 RTAX_FEATURE_SACK |		\

				 RTAX_FEATURE_TIMESTAMP |	\

				 RTAX_FEATURE_ALLFRAG |		\

				 RTAX_FEATURE_TCP_USEC_TS)



struct rta_session {

	__u8	proto;