From 3d44de9a10ea2b1658dfaed8ea6d3d7b6e0defbb Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Fri, 20 Oct 2023 12:57:45 +0000 Subject: 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: Eric Dumazet Signed-off-by: David S. Miller --- include/linux/tcp.h | 5 +++++ include/uapi/linux/rtnetlink.h | 18 +++++++++++------- 2 files changed, 16 insertions(+), 7 deletions(-) diff --git a/include/linux/tcp.h b/include/linux/tcp.h index e15452df9804..04a0e647ef74 100644 --- a/include/linux/tcp.h +++ b/include/linux/tcp.h @@ -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 */ diff --git a/include/uapi/linux/rtnetlink.h b/include/uapi/linux/rtnetlink.h index 51c13cf9c5ae..aa2482a0614a 100644 --- a/include/uapi/linux/rtnetlink.h +++ b/include/uapi/linux/rtnetlink.h @@ -502,13 +502,17 @@ 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_ALLFRAG (1 << 3) - -#define RTAX_FEATURE_MASK (RTAX_FEATURE_ECN | RTAX_FEATURE_SACK | \ - RTAX_FEATURE_TIMESTAMP | RTAX_FEATURE_ALLFRAG) +#define RTAX_FEATURE_ECN (1 << 0) +#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 | \ + RTAX_FEATURE_TCP_USEC_TS) struct rta_session { __u8 proto; -- cgit v1.2.3