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tcp: add RTAX_FEATURE_TCP_USEC_TS

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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 <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2023-10-20 12:57:45 +00:00 committed by David S. Miller
parent b04c332088
commit 3d44de9a10
2 changed files with 15 additions and 6 deletions
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5
include/linux/tcp.h
View File

@ -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 */

16
include/uapi/linux/rtnetlink.h
View File

@ -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_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)
#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;